 So welcome to episode 9 of taking apart a Monroe mechanical calculator model K So This time what we're going to do is take apart the keyboard assembly So there are 10 buttons from zero to nine and there are eight columns and Basically the way it works is that each of these keys is actually spring loaded, so They're just spring loaded on the back These are sort of cam surfaces that when the key is pressed down and held down It moves this rocker bar, which in turn moves the Leibniz wheels over So that the correct digit is registered it actually sits like this these are all the zeros these are the nines and Basically when you press a key down it locks into place Until this other sort of rocking bar thing, which is also spring loaded Releases the key and the way that's done is There is a spring loaded bar that goes all the way across So It releases those keys There's also what I think is a Locking mechanism That's this bar over here So when it's pulled you can press down a key and Zero it out, but when it's pushed over on this side you can press a key, but you can't zero it out And I think that's part of the repeat mechanism, so you can keep adding And the keyboard doesn't reset itself like like that The other feature of this is that there's this axle over here There's this axle over here, which pulls on These keys over here and in fact It would pull it would pull down on these keys and these are the zero keys So by pulling on this lever that would pull all the zero keys down So that's so that's sort of like an all-zero key. So let's take this apart There's going to be a lot of small parts, especially because there are 80 of these keys and each of these keys has Various parts associated with them We're going to need plenty of bags I want to use let's see one two Three bags and we're going to call them 11 a b and c we're on bag 11 And the idea is that 11 a is going to contain all of these 80 key Stems 80 b is going to contain all the small parts that come off each key stem and 11 c is going to contain all the little springs So bag 11 a of 7 7 3 3 9 bag 11 b 7 7 3 3 9 And 11 c of 7 7 3 3 9 so 11 a Is going to contain all the keystones 11 b is going to contain all the small parts and 11 c is going to contain all the springs so Let's turn this over and if we turn it over we can see that There are four screws Holding the base plate onto the frame. So we'll remove those These are also round heads Just remove these and measure those. This is a 448 screw That measures out to 0.255 So this is a small part. It'll go in 11 b I guess So we'll remove the other screws So I can tell that this is 440. It's the same size quarter inch same size Quarter inch and the final bit So I'm going to hold on to the frame while I do this set the screw aside, and then I'm going to turn The assembly over and this is also a quarter of an inch screw Okay, so Let's see So the next thing that I can do is I can remove the frame and it's just in there with some pins So there are some pins here, which are for these bars There are some alignment pins on the top and on the bottom And again, it's important to note the orientation. The orientation is so that this dip which is where the carriage Moving axle goes goes right across this way. So there's actually Something on it that says K175. I don't know why it says 175 Okay, so this is rather interesting so this piece is I guess it's steel or Iron or something And it was molded It was poured you can tell because there's a separation line over here and They've grounded out pretty well, there's another separation line here, but basically in here And that's where the the part in the mold was made. So this thing was poured this way and Then the top of the mold was put onto here like that And then the holes were drilled the pins were installed and that is how that worked. So we'll put this aside We could pull these out, but the problem is that there are springs here So what I'm gonna do is I'm going to let's see Okay, so see this bar can actually come out But it's connected with a spring right here So I'm wondering if I should Unhook this. Yeah, I will unhook the spring from the bar and just unhook it like that And then I can do that to all the other bars as well So all those bars are off This bar comes right out. We'll call this the locking bar Because I think that's the purpose that it serves Actually, I think this is the locking bar and this is the clearing bar. So Note that it looks the same, but it's not quite the same as this other bar, which has a spring attached on the other side The important thing to note is that there is this extra piece riveted onto it so that Bar with the extra piece fits over here and it doesn't go over here So we can pull that apart But put that aside There's also a spring here Which is for the locking bar. I will unhook it from its post Well, okay, and I'm going to have to unhook it From the part as well because otherwise it won't fit through the slot So I'm just going to reach and pull All right, so this is a small part It's going to go in with the rest of the small parts, but I have to measure it So in its outer diameter it is point one thirty its wire diameter is point zero one and its length is about Point five six So that'll go in the small parts bag Now we can lift up this and then again you can clearly see that Oops that They're very similar, but one of them is slightly different You can see that This one here actually has sort of a rounder cutout over here, and this does not and This one has a riveted piece on it So that can go aside. Okay, so we've got a bunch of springs which will leave for now Okay, so we can start to remove these key stems so the way to remove the key stems is Is there's this very clever mechanism and you're going to need the long-nose pliers and what you do is There is a piece right over here That you're going to hold on to and then you're going to press this washer down and then you can pull this piece out So we push down on the washer pull this piece out and then the washer comes up washer comes up and The spring as well and then the key Comes out the bottom and on the bottom there is a piece of felt and Another washer and the key stem itself so Again, it's important to note the orientation of all the keys these little cutouts on the side point that way Which is on the side with the a Okay, so I said I would put all the key stems in 11 a I'm going to put all of these small parts which means this Locky piece the two washers and the felt washer and the felt washer is to To help reduce Noise when the key is released so that it doesn't bang into the the base plate with a Loud harsh metallic sound these springs. I'm going to put in 11 C All right, so That's basically that so now through the magic of time-lapse. I'm going to remove all the others Okay, so you can see that The zero key stem is different from the non-zero key stem It's got these holes which appear to serve no purpose the The shape of the side cutouts is different And of course the bottom is different Because the bottom needs to hook on to this axle right over here. So These will go in the bag Along with the other key stems So those are all the key stems Bag 11 a these are all the key springs bag 11 C and These are all the washers and Felt pieces The little retaining things some screws and some springs. So we're left with this So first thing that I'm going to do is remove these springs that held the that worked the bars so It goes the other way The other way. Okay, so there's one and they're all the same two We just got hooked together seven eight So they hook into holes in here and we're going to measure the outer diameter point one twenty six the wire size point zero one two and the length of the spring is about point 508 and these springs go into the small parts bag Okay, so This rail for the springs is actually riveted on so we can't remove that The only other piece to remove is this frame Now in order to remove the frame There are four screws one two There's one over here and there's one over here so We can't really get to them So we're going to remove this axle first the way to remove the axle is There's another one of these cylinder spacer things with a set screw so we Loosen the set screw and then as usual these things are a little stuck relative to their axle so we have to sort of Hold on to it while we move the axle or at least try to It's quite sticky Okay, and then we move the spacer actually First thing I'm going to do is remove the spring. So I'm going to remove it from its hole here and from its hole in The frame and we're going to measure it point one twenty nine Wire size point zero one zero length point four four nine Okay, so now this can move So now that I've loosened the cylinder somewhat it's still a little sticky we push the axle that way We attempt to push the axle that way and it's going to be really difficult simply because of the sticky oil Really really difficult Let's see. What can I do? See the problem is that if I hold on to this really tightly it's going to scratch and I've already got scratches on there now Which is kind of bad Maybe what I can do is I can hold on to the no so probably what I would have to do is maybe take a pair of pliers and Just No, that's not going to work either. So Okay, well The problem is that in order to get to these screws. I need to remove this So I pretty much have to Try to get this off so what I'm going to do is Go get let me see. What should I do here? Well, I'm going to go get another set of pliers and Hopefully that will work. So we shall see Okay, I have a set of locking pliers here. So I am going to Put that onto the part And lock it and then Wow, that's sticky. It's very sticky. Okay. Now. It's now. It's loosening up a bit I guess due to the heat of the friction Okay, now I can loosen this Hopefully I can now there we go now. I can push the axle over Okay, and now that I've pushed the axle over it actually comes out of the other side I can lift that pull the axle out Pull the axle out And we're done. So that crud is Due to whatever bad Awful oil they used So I can take the the spacer out. I'm going to keep the set screw in there I'm going to put it in the small parts bag Okay, and now we have this piece which is held together using taper pins So we can't really take this apart any further unless we start talking about taper pins But now we can finally get to these screws So let's go ahead and remove those. So this is a 448 screw and it is a little longer than the others This screw is a point three six nine Okay, and then there's this And again, this has to be oriented correctly So you can't put this over here So this Side angles that way Like that. Let's put that in the bag Okay, this is actually a smaller screw It's still 448 But it's point two five oh This screw is the same point two five six and this screw Longer and it's point three eighty three and we get another one of these parts which must go on like this Okay, and now the frame comes off There it is it also says K1 75. I don't know why And again the orientation needs to be correct So somebody wrote an a on here and that's where this little Indentation goes and that's all the parts that we can pull off of here you can actually also see that the Serial number is stamped on the plate as well. I guess it makes a match set. So Well, that's it for the keyboard there is nothing else to take apart from the keyboard with the exception of This which has some taper pins Again taper pins is a bit of a Sticky subject because they're really really difficult to take out when they've been sitting there for 80 90 years So I won't go into that at this point But we really should soon eventually so that's it. Bye