 Hello and welcome to another installation of taking apart a calculator except we're no longer going to be taking it apart. We are going to be putting it back together again. I'm Rob and this is episode 017 I think of the calculator episodes. So you can see this is the large digit wheel from before we took this out and I took it apart and indeed it had to be cleaned because of all the grease that got congealed onto it. So you can see that I took it apart, cleaned all the parts and oiled them and they move. They move perfectly so and I can yeah I forgot my tripod so this is going to be a handheld episode so we okay that's that's enough of that. So okay so there's the large digit wheel there is the shell of the carriage which we're gonna put together I hope. The problem is that I haven't been taking notes usually I do as I mentioned at the beginning of the series and I've basically been relying on the videos to make sure that I know where all the parts are. So we'll see if we can do this in the reverse order. Before we do let's take a look at some new tools that I got. I remember that last time I was complaining that I didn't really have a whole lot of punches that were of different sizes. I managed to find online these are actually gunsmithing tools or they're sold as gunsmithing tools from Grace USA tools. It's the set of seven piece steel punch and it comes with five different sizes of punches they start from the smallest which is a sixteenth of an inch and then it goes up by a sixty fourth of an inch another sixty fourth of an inch then it goes up by a thirty second of an inch and another thirty second of an inch so it goes from a sixteenth to five sixty fourth to three thirty two to an eighth to five thirty two and they're flat. The other sets from this place have either points or rounds on them. This set also came with two other punches one of them has a pointy bit which is no good for us. I think these are for roll pins or something I don't know what and this other one is tapered which doesn't really serve us any purpose so yeah and this is the only set that I could find that actually went up in sixty fourth of an inch increments all the other sets I think were basically missing this so so I get an extra one in there so that's good all right so what I'm going to do is I just needed to bang this pin back in and I'm going to do it gently I'm not going to apply a lot of force and in addition I'm not going to put it in very very strongly or very I already said without a lot of force so that way you know I'm pretty sure that that this thing is not going to come apart the only reason why these things would come apart is if there's a lot of vibration and I don't think there is on this machine especially considering that this is a hand crank machine not a motor driven machine so I'm going to go ahead and bang that taper pin in and then I'm going to see if I can put it back into the shell in putting this back together again we have on this side of the shaft we have two parts that we need to put on one of this one of the parts is this lever which the purpose of it is to fit onto this cam over here and the cam lifts this and drops it which serves the purpose of preventing this axle for the smaller digit wheel from moving as the larger digit wheel is being zeroed so that goes on this way yeah I'm doing this one-handed I also have this oiling thing right here so I put some oil on here and on the part itself I really should have cleaned the part first but that works pretty well so as long as it's not sticky that's good and then the second thing is this gear this gear as you can see has actually some of the teeth off of it and the reason for that is that when this gear over here turns it engages these teeth to turn to turn this axle which will turn all the wheels and then this central part has these little pieces that stick out that hit these little pieces on the gears and on the wheels to cause the wheels to stop in the right zero position and then once it's turned a sufficient amount this part comes into play which prevents the axle from moving again so that part goes on here and as we saw before it aligns with that notch over here just like that so it would go on basically like this right is that aligned properly looks like it okay and then I just stick the taper pin in just like that I think that's the way it goes yeah okay and then I bang the taper pin in so I've got my little metal block here I've got my hammer and I'm just going to use one of these larger punches just to tap it in gently and then we will move on to putting it into the shell so in putting this back in what I've done is from these nuts well screws I've taken the nuts and I've put them on the end of the shaft you can see that they're on the end of the shaft so then you know they're there also when I put this in this notch over here goes on to a little pin on this part over here so then it just sort of rotates in and then I can put these nuts on and then of course as I mentioned earlier these set screws inside are adjustments to adjust this thing back and forth so I'm not entirely certain where that should be but I will just get these in and adjust it later one thing to note and I had put the large digit wheel in and I had it installed and then I forgot that I had to do something which is if you see this gear here you can see that it's got this flat spot and the large digit wheel gear also has a flat spot that flat spot has to be installed so that they line up like this yeah well you got the idea like that because otherwise when one of the gears turns it has to basically align with this part so that all the teeth mesh so I have installed the large digit wheel in the correct orientation here is the end of it as you can see there is a notch in there that when I turn this you can see that it rotates and those clicks that you hear are actually the digit wheels being stopped so if I like move the digit wheels to whatever position and then I can show you that indeed when I turn the crank the crank came off all the digit wheels zero out so they all stop at zero and that's a good thing so we were going to put the small digit wheel into the carriage and I've got my tools already but first I have a new tool remember that I was complaining about this thing this kind of a nut with a thing in the middle and how it would be nice to have some sort of a tool to open this or to at least hold on to it well I found one it is called a Campagnolo chainring bolt nut tool it's a bicycle tool here is I don't know if we can see this but anyway there it is there's a picture of it you can get it at velomine.com it's about 19 bucks again it's for bicycles and I found it ever so slightly too thick so I just ground the ends down slightly and it fits perfectly so that's pretty awesome in terms of obviously this end yeah it's not going to fit so you would need to get another size of this they don't make them in other sizes but you can see how easy it would be to actually make one of these just out of a piece of bar steel you just cut a slot down the middle bend the ends and then I guess harden it I've never actually hardened steel so anyway that was kind of cool so we are now going to get the small digicle which I have in my secret plastic container oops I got the oil out as well a little oil thing okay so here is the digit wheel take a look at that last one that is the one that I 3d printed so you can see that it is different it's got a slightly different shade the last time you saw it it looked pretty crappy because basically I had painted it white and then put some black paint inside and then rubbed it off and the black paint just sort of rubbed onto the ring itself and it looked pretty crappy so what I did was I first I chose maybe a little more appropriate color this is kind of I don't know sandstone tobacco nicotine teeth sort of color basically it's kind of brown that's been really lightened up so I took some brown and I lightened it up with white and then I carefully went around all of the digits and looking at it in person it's obvious that it's different but it's a lot less obvious than it was before so that's pretty cool anyway so this is the next thing that we're going to put together so obviously we are going to need to install all the things so let's see what that was so we have this we have obviously the the nuts at the end see what we've got so here's the other nut without the set screw there was this thing over here on the end there was also this cam at the end there was also this locking arm which went on this side okay here's the set screw this is a support thing that went right in the middle of the carriage like that and there were a bunch of screws that were associated with that let's see what we've got here we've got five screws let's see a couple of them look the same three of these look the same we've got a bunch of washers three washers that look the same this really thin washer that I remember came off of here and this little clip um this is the plastic that came off of this crank which I guess eventually I'm going to 3d print make that a little better and one of these screws went into here one screw is bigger than the other so it's definitely going to be just one or the other and I think it'll end up being let's see is it this one this one doesn't see yeah this one right so keep that on keep it separate so the remaining thing so okay so we've got these three screws that are meant for this support along with I presume the washers I'm not going to check the video I'm pretty sure about that and then we finally got this one last large screw which I think is probably the screw that goes on to the end here on the crankshaft the larger crankshaft on this one yeah so that would go on to there so that goes there excellent okay so I think we've got all our parts laid out properly now so we have uh let's see so we've got this which needs to go onto there which means I need to remove I guess this which maybe I have already done um so that gets removed the arm gets put back on what I'm looking for is um this arm over here comes down and it locks into something in here so let's see if I just put that in hmm okay I think it went in here like that and then this actually yeah okay so aha okay so I didn't have to take that gear off in fact this arm goes on the end right over there so that works um and that arm I believe yeah that arm locks into this notch in the end of the gear so that's how that works so I don't have to take that gear out okay uh so I think the first thing that I'm going to do is I'm going to reattach this central support over here which will involve a washer and a screw each so let's go ahead and choose an appropriate bit I think uh maybe the small bit works no that's too small that's way too small don't do that about that bit so it occurred to me that these videos are really boring um and the reason probably why they're really boring is that you only get one view you don't actually see my face do you want to see my face there it is um and I really don't know how to make it any less boring the problem is that I don't have a second person so you know there's no interactivity between another person so this is one of my important tools coffee so there's no second person that I can talk to about this um there's nothing really interesting about these videos unless you're uh really really fascinated by this sort of thing which I am but you might not be how did this go on this went in from the outside I'm pretty sure yeah I'm pretty sure it went in from the outside now the question is did it go on from the outside with the washer um let's see how that looks um I don't know there's an outline here there's kind of an outline um and I I tend to think that the washer was on the inside yeah so okay so what I'm going to do is I'm going to break right now quickly check the video and see if the washer went in on the inside or the outside the washers went on the inside so let's go ahead and do that let's go ahead and spend a boring minute or two watching Rob fumble fumble around putting pieces back together again so uh I'll put the screw in I will put the washer in so in looking at this um I realized that um that this thing was put together in a particular order and the order was um the very first thing that they did was they put this uh central axle in the second thing that they did was they put well the second and third things that they did was they put the large axle the large wheel the large digit axle and the small digit axle on um no okay they put the large digit axle on then they put the central support then they put the small digit axle on then they put this uh central axle on which doesn't actually seem right to me because um okay um if they put this central axle in last they couldn't actually get it in here so obviously um they must have put this central axle in just after they put the large axle in so it goes one then two then three then four then five I'm pretty sure in terms of this mechanism over here I'm pretty sure that they put um this in uh well they had to put this in after this so that they could line up the part properly so I guess this would be put in simultaneously with this axle anyway um that is pure speculation on my part um so let us go ahead and at least put this screw in loosely is it in no we're gonna put it in loosely there um so that it's uh so that the washer doesn't come out so now we've got these other two screws and it's washers so I'm gonna take one and let's see how I'm gonna do this um I guess I'm just gonna stick my finger in there maybe oops yeah okay that's awkward how exactly does that work how would the ancestors have done this by hand I know that go ahead and maybe just put like some small dab of grease in there to uh hold it on but I am certainly not going to use any grease because I hate that stuff let me go ahead and take a really small needle nose pliers and just get another boring part of the video watching Rob fumble around with a simple screw and washer they do this I think they must have used some sort of uh an oil or grease or something so I'm really considering opening up comments on these videos so that you guys can at least give me some more immediate feedback instead of just yelling at your computer saying how much of an idiot I am you can tell me how much of an idiot I am in the comments and maybe I'll learn something because um you don't learn anything unless you fail if you succeed the first time in doing something you haven't learned anything ah maybe this is how I should do it yeah okay um so well this is easy perfect all I have to do is screw them on one and partially screw the other in partially and there we go all right so that is approximately how it's done there may be better ways I don't know them too much okay there we go now the support's on excellent all right uh let's see so what have we got left all right so we're gonna need to I think put these parts on probably maybe pretty sure we are going to have to I'm pretty certain of that because otherwise we wouldn't be able to get this on because this one is taper pinned in so I'm going to where's my table pin tools brand new table pin tools making guns okay come off that way yeah okay so um if I recall correctly which I probably don't I think this washer is on top of here so it was like this and then the washer and then the taper pin I think certainly wasn't like this it's definitely like this probably wasn't like this wasn't I think it I think it wasn't like this and then this went on top no I can't be right because the taper pin would stick out I think so I'm going to check the video again and see what we've got this part goes like that um and the taper pin is placed so that it is completely flush and then this part goes on top then there's the washer and then there's the clip so let's uh let's go ahead and do that so I'm going to remove the tape yeah I'm going to remove the taper pin uh let's see which side it actually went on it would have to be let's see this hole looks smaller than this one um so I think it has to go on like this let me get some oil on this to make it easier see how much easier that is not much easier this is really tight fit oh probably because this hasn't been cleaned um I mean this uh this can hasn't been cleaned so let's just go ahead and maybe um knock it on a little bit so there it is I'm just aligning it with the hole now which hole is smaller I think it goes in this way so now I've got to knock this in but where's my little block don't want that falling over a little block block of support plus two okay so I've got a hammer I've got a little maybe I need something a little bigger than this so this is pretty big just to knock this pin in knock it pretty flush if I have this in the right way maybe I should check the video just to make sure yeah I have this in backwards okay that's uh that's okay I didn't uh do anything permanent so let's go ahead and knock the taper pin out and turn this 180 degrees okay and put the taper pin back in okay the key to this is that um we have this flat end over here the untoothed flat end and that lines up like that so I'm just checking the orientation in the video and yeah that looks about right so let's go ahead and knock this in okay we can now knock it in a little more choosing the correct diameter it's just too small I think this one yeah this is 330 seconds so I'm going to knock it in with that I just want to make sure yeah there's a little lip see if I put this piece on it's not going on because the taper pin is um preventing it from moving so I'm just going to knock it in just a little more just a little more I think that's a tiny bit more still sticking out a little bit let me get a maybe slightly smaller one let's see that was 330 seconds and this is 564th which is a 64th of an inch smaller knock it in I think that's okay now almost almost knock it in a little more that's got to do it if it doesn't it does kind of um I may need to file that down a little bit knock it in just a little more actually let me feel around here yeah I'm not feeling any lip so I think the the pin may still be um sticking out let me take the bigger one knock it in let me feel it I'm feeling a little bit of a lip certainly goes on a lot easier but it's not spinning smoothly so let me knock it in a little more just a little more just so that I'm sure it's not sticking out okay well that certainly that certainly is good um oops let me go get some oil and stick it on here and see if I can make it spin a little more freer freely um I should have probably washed these um these parts first but I didn't do that so instead just going to oil them and hope for the best yeah that's not it's not spinning very smoothly like I would have thought it would or should should it spin I mean I think it should spin freely so okay let me go ahead and file this down a little bit and see if that helps okay so I filed uh the little um ends here just in case there were any burrs I filed in on both sides just using a an ordinary file wiped it down with some oil and a and a napkin I'm going to put some more oil back on because that certainly couldn't hurt and now I'm going to put this part on and see if it spins freely um yeah okay so it it doesn't spin as freely as it did before I think again because I may actually need to uh clean these parts off a bit um but I think I think that's not really happy with it I really am not I'm really not so happy with it so well I guess I can just live with it it's not great but it'll do okay well now it's uh it's spinning sort of freely okay all right that'll work uh okay so let's put the cap on the oil needle thing thingaling so now the next thing that we need to do is put the washer on the end get seated in there okay done and then we have to put the clip on which may take some doing um let me go get a um there's a special tool that you use to open this up it's really not meant for this kind of a clip but let's see what I can do with what I have here the needle nose pliers yeah okay that did you basically open this up yeah that's not going to work so I think what I need to do is somehow get this open so that's a puzzle I can't really hmm okay yeah maybe I need to just pry at one side and push that in somehow holding on to the other side so that it doesn't move jam one side in and I turn around and jam the other side in bottom side because I want that in its groove and then put the other arm into the groove and the bottom came out so I'm going to have to put that in I think that's it yeah so let me just get this part aligned there we go all right and it seems to spin pretty freely um I guess I should have put oil uh between there um I can do that now between the washer and the the little part thing and spin a little more to distribute the oil and I think that does it for the small digit wheel so all right so now this thing goes in here with this arm so I'm going to put the arm on here uh let me oil the arm first because the arm is a moving part so I put the arm on the other end so that it spins pretty freely and then so now I know that on this side um we have this kind of an arm and on this side we have um these flats on the gears so the flats have to mate and also um we've got this little we've got several parts here that just need to click into place let's see if I can get those to click into place uh okay so I think put this in first then I can rotate this arm in I do it's not going all the way in no no reason it's not going all the way in is that the gears aren't aligned on the other side there we go what is preventing this from going in there we go yeah what's in okay perfect all right so now let's see we've got um two different nuts one of them has a fat nut on it and one of them has a thin nut on it um I believe that the fat nut does go on this side um oops that was kind of dumb I should have put the nuts on the ends well I'm gonna have to remove this again open up the arms the thing out put the nuts on the end here go and put the other nut on the other other end and the nut goes like this with the lip facing inwards that goes there now let me push all these parts around and get them aligned okay I think that works so let me go ahead and um put this on the one end um let's see let me uh yeah let me just go ahead and put this on it has to go in so that it goes on the end of the axle why is it getting on the end let me try the other one the other end works pretty well so on the other end I can just uh hold the nut just like that um and then screw this on a bit and I can rotate the nut on like that and then I can tighten it up using my special tool great and the other end have to attach somehow is the other end not aligned it looks aligned to me so this just goes on like that oh maybe it's just the the nut that needs to get centered in there I'm just gonna move the nut around where aren't you going on ah there we go now I just snapped into place okay so um um now I need to get the nut rotating onto this part so I need to manipulate it let's see this way or actually uh to get it started I'm going to um rotate this just to get that started of course I need to hold the nut in place so that it does not move which is a little more difficult this is just a little time consuming here we go now you can see what I'm doing so I'm just rotating the end nut and holding the inside nut in place with something and let's just tightening it up quite nicely there we go all right so next the last thing is the set screw so the set screw goes in here and I don't want to oil that because that's not something that's supposed to move so I just want to make sure that I get the set screw aligned properly once it is I can attempt to screw it in I want to tighten it up too much because I'm not sure how this thing is supposed to work okay um it looks like everything is in um oh with the exception of the spring that goes between these two parts um move this a little bit okay so um the spring I put in bag 15 so let me just grab that spring and the spring adds tension to these arms so I'll just uh doesn't matter which way this goes on no okay take this end and just put it on get over the end over the end there we go all right okay so um the test I'm a little bit nervous let's go and get the crank on so this should just work oops the crank it's over here I'll put the crank on I'll put the screw on the crank putting the screw down here we go let's see if it actually clears out the digits that's the one side brilliant absolutely brilliant let's uh maybe raise this end up and basically it goes like this set that end and zeroes out that end and it works all right um that was a little shout out to tabletop by the way um if you haven't watched Will Wheaton's tabletop I highly recommend it um it uh it basically plays um they basically play a bunch of tabletop games with a bunch of people usually actors um and the tabletop games are not things like monopoly or you know sheets and ladders but they're modern tabletop games which are actually fun for adults uh so yeah there we go um so what I'm going to do is I'm going to go ahead and put the windows back on um and then we should be done with this there's also this um knob that goes right on here and the purpose is to be able to lift this up and down so I'm going to put that on as well um and then we should be done with the carriage which is one of the more complicated parts now um I looked at the patents for that were issued to the Monroe company so I've got a whole set of pages here so let me move this back so I can get this in frame okay so um this is this is um uh an article that I found um uh called uh in a magazine called international marine engineering um back in back at the turn of the 20th century they used to have all these trade magazines and they were very specific um this one was for marine engineering this one is the article from May 1918 and it shows a picture of the um probably the g version of the Monroe uh calculator um as I probably said in episode one there were various um models and they started from A which I think um A, B, C, D, E and F I think were the prototypes each one was for one year I'm pretty sure um then there was the G, H, I and J um and I think I originally said that there that the H, I and J were probably prototypes that turns out maybe not to have been the case H, I and J were probably just years two, three and four of the model G so you had G, H, I, J and then this is the model that we're working on the K um so let's see I have a picture of Mr. Monroe um that's who's who in the alumni university so that's Mr. Monroe and I also found let's see a picture of Frank Baldwin there he is um he's the old guy because he he was probably in the generation previous to Monroe anyway this is the 1800s guy who first basically started this thing and then got together with Monroe and here's a picture of Mr. Monroe at roughly the same time um he looks pretty awesome even though he was uh he started as a lawyer and he's probably just a businessman um and we sort of don't like MBAs today but uh he looks pretty cool actually um this is an article from 1919 in American Machinist um this is a really really useful article because um again it shows this um G slash H, I or J model um which is the model previous to the one that we're working on but it actually shows the machines that they used and it goes into the processes that they used to actually build it um the images aren't so great because these are scanned black and white images um I have um I probably have to find uh an original copy of American Machinist um but here is where they're putting together the uh the keyboard here's where they're putting together where they're punching out the holes for the numbers that would be on here um well actually not quite this but they probably used a similar process um so you know there are some pictures of you know putting together the keyboard and some guy in a hat um bunch of parts um and they don't go into quite the detail that I would have loved but you know I'm assuming that back in 1919 they sort of were already familiar with the processes these weren't like novel processes that they used so you know they would mention things like um like uh what is it figure 19 shows a milling fixture which is used to mill the rectangular passage across the ends of the bushings and they show a picture of the machine and it's kind of assumed that you look at the machine and you know oh yeah I know what that machine is but I look at that machine and I'm like I have no idea what that is um so what I wanted to show was the actual patent for the carriage mechanism um and I did this using uh Google patents which is a really useful site um character recognition is not quite there yet so if you're searching for something like Monroe it'll probably find 80% of the patents um so let's see where are we already 1923 here we go okay 1923 oh yeah okay so one thing about patents that you have to watch out for is that the date on the patent is really the date that the patent was issued what you really want to pay attention to is the filing date you can see that this was issued 1923 but the filing date was August 1920 which means that they actually had this all drawn out basically they might have made a few modifications based on feedback from the patent office but basically they went to the patent office with this design in 1920 so you know that this design was um fully formed at least in 1920 so here it is um this is a patent filed in October 1920 um it's called the zero setting mechanism um and basically it shows the mechanism of the carriage um and in fact if you look at this you can sort of see that they're pretty much the same there's a um can I stand that up yeah so here's the small the large digit wheel here's the small digit axle um there's that axle in the middle and there's this axle at the top there's the crank there's this funny mechanism on the side um and on the other side they talk about cams um here's some details of it um some more details and then it goes into some verbiage about how it actually works um and honestly I read this and from this I could I could figure out how it worked but only by looking at the actual mechanism the drawings I couldn't really make too much sense out of them um but using the actual mechanism in front of me I was able to figure out aha so that's what that does um so anyway that's uh that's a really useful thing so if you're interested in that there's the patent um so oh yeah so the 1920 basically means that this uh machine um could not probably could not have been issued prior to 1920 um because this is a production machine and obviously they wanted to protect their mechanisms with patents so they would want to at least get the patent pending in which means that the moment they filed it they could probably start producing us so um so this is no older than 1920 so I think uh that's going to be about it for this episode um I've been watching some videos on how to make your videos more interesting and they talk about a lot of cuts and music and interstitials and and uh yeah so take a look at tested.com um that is really what I'm trying to go for um tested.com is a site um ostensibly uh connected with um Adam and Jamie of uh Adam Savage and Jamie Heineman of Mythbusters fame um mainly it's Adam because I guess Jamie is not too comfortable in front of the camera but anyway um and there are these other two guys um Norman Chan and um Beardy Guy Beardy Mcbeard I'm sorry dude um Will um and uh they basically get together and like put together Lego or they talk about some something that has to do with um special effects or whatever um and anyway they just get together and they chat um or they have uh videos where they put stuff together or you know show off like a watch or something and how it works and they do a little review um but you know the point is again that they are more than one person um and they have more than one camera which means more than one camera angle and uh but nevertheless they don't really have interstitials um they don't have you know cuts with fancy graphics in it um and they seem to do pretty well probably because A they're connected with Adam in the beginning and B you know they're more than one guy um so I'm not going to put any interstitials or fancy graphics on this maybe I'll put an intro and an outro somewhere in here anyway sorry for rambling on like that um I'm just sort of really pleased that um I got this actually working um so again I'm going to uh set the digits and then I'm going to zero them out wow it actually works all right so um for this episode uh that's it I will see you next episode