Home made Gear cutting Hobs part4

[PLUSHAIRPLANECARPET]

maybe you can make a program on your mill to sharpen tools

[Hobbynut]

@PLUSHAIRPLANECARPET I tried this to sharpen the regular involute cutters but had no luck. It is a good idea. I just didn't fully persue it.

[Jeff260z]

What is the included angle you have to grind the tool bit to 40 degrees?

[Hobbynut]

@Jeff260z Yes that is correct the included angle on the tool bit is 40 deg for a 20 deg pressure angle gear.

[kuei1248]

Nice video. 1 safety suggestion. When using a file on a lathe spin the chuck in the reverse direction (M4) and hole the file with the handle away from you. Alot of time files grab and the pointed handle can get launched at you, or into the palm of your hand. Should the file be grabbed it will be pulled away from you.

[Hobbynut]

@kuei1248 Very good suggestion, thanks. I think that I should also have a handle on the file that would be safer as well.

[ElQuesoGuapo]

@kuei1248 I run the lathe forward, but I stand facing the spindle and hold the file out in front of me. My right hand is loosely holding the tip of the file, and the left hand is holding the handle end. If there's no handle, I hold it with my fingertips so that the spike sticks past my hand instead of being aimed at my palm.

I'm holding loosely, so if the file gets grabbed by the lathe, it will be easily pulled out of my hands and thrown away from me.

It's a different method but works so far

[Valtomotive]

thanks for posting i learned a lot with it..

[biffalos]

Hi

Very informative video,where do I find the information to calculate the spacings for the cutter teeth. I am trying to make a hob to cut a pinion gear for a clock which has 8 teeth and is 0.75 module.

[grindhouse84]

believe you need to find the circular pitch.

CP=Pi(3.1415)/Diametrical Pitch.

to find D.P~25.4/module(.75)=33.8666

Pi/33.8666=.0927

[qwerty9321]

Great videos, I learned a lot with it. I think it would cut softer if you make the advances using the top slide instead of the cross slide. You´ll need to rotate the top slide to the mark 20 degrees on the back of the cross slide and only the left part of the bit will really cut, the lathe will work smoother.

[Hobbynut]

You know I never have thought of this. I am not sure why since it is a common practice in cutting threads. Hmm. I will have to try it. Thanks for the idea. I will have to change the gearcodit program to change the depth of cut via the compound.

[qwerty9321]

Please keep posting the results, I don´t have a CNC but if you succeed it´s one more reason for an upgrade. I believe I can make a nice square teeth worm/worm gear pair with your method as well, I already made the hob and worm for it and it´s looking nice.

Thanks!

[guaniquilla]

They are three type of people in this world;

Leaders,follower and the ones they don't do anything but criticied,Sir you are a leader looking foward to see your next video #5

[tvicena]

you can trig the tool angle to find the prper angle you need

[rockbod]

Thanks for the cool videos, I think they will be great for me in cutting watch gears, and especially for tooling to do so.

[Hobbynut]

Your welcome, send me some pictures of what you do.

Shorty

[mikefromspace]

I'm torn between a kx1 mach and a kx3 mach from harbor freight. I'm looking at machining 304 stainless and 312 hollow hemispheres. Would I be best off with the kx3?... or is there a kx5 or something even better? My parts no larger than 6" wide, maybe 8 but atleast 6.

[Hobbynut]

Hello Mike, wow I was not aware that HF sold these units. I went on line in order to see if I could see the specs on these and was not able to. I would not be able to suggest which one would be best for your situation but I will tell you I plan a trip to HF to check these out for myself.

[mikefromspace]

Wish you could use a better/ closer mic.! I can't hear you with volume all the way up! Your editor software should allow you to normalize volume usually.

[Hobbynut]

I have a headset that I will try in the future to see if that helps I was not aware there was any problem but I know my camera has a jack for a mic and I will see if this works better.

[pablopeu]

Hi Shorty!

Im for sure want to see how this tutorial ends. Thanks for taking the time and effort for doing these videos.

And in response to your videotaped message from last year, have a Happy 2008 Christmas!! or like we say around here in Buenos Aires: Que tengas una feliz Navidad!

Pablo

[caliusoptimus]

you could use a gear tooth caliper to measure the tip of your tool. i havent seen them for sale anywhere, but if you look hard enough im sure you could find one. i know starrett makes a them.

[fuskiny]

hey!! really nice job!! I'm designing a machine for a school proyect, and I really like your videos, nice explanation, nice videos, nice everything!!! I really spect the new video of making the cuttings and sharpening!

really good stuff men!!!

[toddkrein]

Awesome. A great video set. I'm really looking forward to the rest of them!

[caliusoptimus]

if you have cnc available (or the patience to set up your compound slide etc) one could profile the part using a single point cutting tool rather than a form tool. ie 14 degree side angles (for cutting 14.5 pressure angles) coming to a point with a small radius. this would eliminate most, if not all of the chatter, and possibly leave a more accurate hob shape. using a carbide tool would allow you to cut pre-hardened stock, such as drill blanks, also eliminating the need for heat treatment!

[Hobbynut]

Hello caliusoptimus, I am not sure that the sherline lathe is rigid enough to be able to cut any thing that is pre-hardend. Nice thought though

[carsy1407]

Hi Shorty,

Really enjoyed the videos and a pleasant change to hear a "real" person telling it how it is. Where can I find part 5 and more on gear hob cutting ?

Thanks and best regards

[jamen23]

Good video.

What type of steel are you using the make these tools? Is it a type that is heat treated once yo have finished maching?

Cheers

[Hobbynut]

The steel being used is W-1 drill rod. It is hardend after making the hob by heating it to cherry red then quenching in water. Msc mcmaster car as well as several other places sell this.

Shorty

[Roskellan]

Love your video's. Curious to how you finish the hob. I don't have a mill so will have to do everything in the lathe, though I have consided using my pillar drill as a mill, with a suitable table. Your very modest in your video's but I get the impression you are really well imformed and able, at what you are doing. My best regards

[Hobbynut]

Thanks, I hope to get to finish the hob videos soon. I am getting ready to change shifts at work and this should free me up with more time. stay tuned and we will have some fun.

shorty

[PAUAULA]

Hello Hobbynut,

You made absolutely the best video's about gear cutting I have ever seen. I really hope you will find the time to shoot the follow-up video's. I know everybody is curious about how you finish the hob.

[westchagnon]

GOOD STUFF

[andax2007]

Looking forward to see the next episode!