Internal gear cutting attachment 

60 years ago, for Christmas, I asked for a Spirograph, you have made the same thing here. Thanks for bringing back a fond memory. Regards, Bernie W.

Back in 1998 had to make a device to cut 60 internal slots in a blind stainless hole. 45 mm bore x 75 deep. Put a slitting saw on a chain drive attachment I made for a Bridgeport style mill. Cuts were 6mm deep. Had to get hss cutters coated with Tin compound, used 800psi straight cutting oil. Took about 90 min per component. Made thousands over next few years.

Victor extraordinar,perfect ar putea invata si viitori ingineri TCM

When we made this kind of 90 degree drive we used a very small roller chain for the drive. That way no slippage, up to the strength of the chain you use. We made them to cut internal keys on a CNC machine but this gear cutting idea is a good idea. And with a proper sized cutter a key way could also be done as well.

External gear cutters can't be used to cut internal gears. The geometry should be inversed so that the internal gear tooth is actually the shape of the gap between external teeth of a gear with the same tooth count and vice versa. Yes, the internal tooth's flank should be concave, not convex. Closest you can get is to always use the rack cutter and don't make gears with a low tooth count.

Nobody has mentioned that the best part of this design is that for milling machine lacking workshops, it would work on our pillar drills too.

Great idea for a new tool! Thanks for sharing it with us. You said something like, "I'm going to stop yapping now so you can enjoy the video." ...I can only speak for myself, but please don't stop "yapping!" The more verbal description you include, about what you're doing and why you're doing it the way you are, the better chance I'll have of understanding what's happening and why. I'd much rather hear extra commentary that explains stuff I already understand, than to risk missing out on some subtle design feature that I didn't pick up on by just watching parts get made. Thanks again for sharing. +1 new Subscriber!

Outside the Box thinking, Shared.

please youtube, suggest me more channels like this!

Every time I watch your videos, I wish YT would allow me to like it more than once. Awesome project, glad I could contribute to it! The indexer came out very neat! I am waiting for the day you will get your well deserved place in the clickspring league! 😎

Your mechanical engineering is amazing. I have nothing to do with lathe machines and machining parts on CNC or manual lathe machines but I like to watch when a crossive and rusty steel rod turns into a shining steel piece, cutting, making teeth, and other stuff is so fascinating. I liked your video. It is so beautiful and designed to achieve the job. Great! thanks for sharing.

Very nice, very impressive job. Nice design and function. Thanks for sharing the process. And I did watch the whole video👍. Have a great day.

Great idea for keycutting.

Truly a brilliant idea, I hope that you publish the drawings as soon as possible so I can replicate them, my warmest compliments

Idea - if you have trouble with fused belts breaking, make the cuts at an angle. The surface area will be increased.

I approve of arc-second precision when making chamfers.

way nice spiro-graph maker. thanks

Necessity is the mother of invention.

Very nice project, well done. Thank you.

Very well done, the part and the video equally.

Well ,I think I like it 👌

Like the use of bearings for filing buttons 😀 tightening rod thing might be a tommy bar? Nice job look forward to seeing what you do with it 😀

Nice. I have been thinking about making a fishing reel with a planetary gearset and was considering putting together something like what you have done.

great job, thanks for sharing

Well done !

That is very Cool! I've been playing around with how to build that tool and was thinking of using a worm drive, The belt looks to be a much simpler approch. Nicely done!

Awesome work!

Great job !

Very cool, I always wondered if there was a decent way to do an internal without a shaper

Very nice Spirograph much better than the junky plastic ones :)

Very informative, and very well thought out! Thanks -- and you have a new subscriber!

That a great design , like your setup you do a great job

great video and great project! Thank you for this! But please get some good taps! Machine taps are so much better! You can also do it by hand. You can cut in one pass and don't always have to back off to break the chip. The thread is a dream afterwards.

Cuando yo era un niño pequeño (hace miles de años) tenía un juguete de plástico igual a esos engranajes ⚙ y lo usaba para aprender a dibujar🤗🤷‍♂️

nice job!!!🥸🥸

Well done

Just found your channel and Subscribed. Very interesting nice work.

Great project, thanks for taking the time to film and take us along with you!

Awesome! Nice and relaxing video : no bla bla, no shitty music. Interesting subject and very good view angle and rythme. Congrat, New sub🖖👍👌

8:41 nice Paint brush 😃

Very creative job👍 Need a just bit more ink for pen ..!! 😅

Nice one, only one thing can cause problem - gear cutter can losen the nut, but looks like it work out fine :)

Sorry. Your build is pretty ingenious though too.

Excellent project, well executed. Thank you for making the video and posting it. I'll likely be plagiarising you soon! I'll likely use a fine pitch cogged tooth drive belt. If I'm not mistaken, one of the cutters in a full set of these cutters are for "infinite" number of teeth, meaning a straight rack. That's probably the best one for this purpose too.

What a great project! Very nice work 👍

Btw, I like your style and content. Subscribed!

Nice work, 👍

Very well done project Anyway, with this kind of cutter you won't achieve the right tooth profile for an internal gear. I don't know if there even are cutters for internal gear teeth. Basically the curve would have to be convex instead of concave. It will propably somewhat work, but the gears will never run smoothly like this. You could maybe try to make your own gear profile cutter, I've seen it being done on Clickspring's channel, but figuring out the right geometry is not trivial. That said, I think your design would have the advantage to be able to make helical internal gears as well, which would be extra interesting.

Very nice! You gained a new subscriber today. I hope to see more great projects like this in the future.

kick ass

Holy cow! I was hope to see planetary gearbox...

Very cool video. Nice work. Subbed! 😊

The internal teeth made by a normal cutter do not give the right tooth model. Design and draw the right tooth curve eg by Autocad. Then grind a cutter. the internal teeth shall have somewhat hollow sides, large dia internal teeth may have flat sides like a rack.

Yessss👍👍👍🥰

🤯🤯🤯 IMPRESIONANTE

Woow amazing, I have a question does the geometry for a external cutter it's the same for a internal cutter?

Nice project 👍😀 But. How do you calculate a inside gear ?…. And the cutters ?… Is there a link to information on this?…

Thank you for sharing. The threading part, minute 15, is that part of the video slow motion or just slow machining? Shouldn't the thread direction of the shaft be the upposit direction of cutting blade?

Un pied à coulisse est un instrument de mesure,pas un traceur

unfortunately no cutter will produce the ciorrect profile... involutes dont work inside the PCD, and the tooth shape is "inverted"... even the rack is still not close. and they often use a different pressure angle. oh sure, it works, but its not the profile required if you were to zoom in/go up a few modules. seems its a better approach to make this as a fly cutter rather than a form cutter. can always use any old bit in it then ;) i like it though. always meant to make something similar.

Я не знаю английского языка , и мне не важно что делают ,в большинстве случаев , пока не просмотрю весь ролик , может мне эта вещь не нужна будет некогда !! Мне важны ПРИЁМЫ РАБОТЫ и ИНСТРУМЕНТ и что куда ставится и чем зажимается . Может ролик идти 40 -50 минут , в нём нет не чего интересного кроме 1 - 2 приёмов . У Вас всё интересно !! Желаю удачи !

Hi Sir, This is an amazing project. May I ask if you have some of the layouts of your project? I would like to make one also for my workshop. Thank you.

El único problema antitecnico es q usa la herramienta inadecuada par hacer los trasos el calibrador no es para eso es otro aparato q se llama Dramil

Where did you find the small diameter gear cutter?

🎉❤❤❤

❤❤❤❤❤❤👍👍👍👍👍👍👍

I think vernier scriber are more cheaper than cutting tools.😅😅😅😮😮😂

Would an EDM setup be another option for making that internal gear?

22:04 при фрезеровании гайка будет откручиваться.

What is that DIY belt made from? What do I search to buy some? Thanks

Passt die Zahnform noch?

You can insert a musical accompaniment. So that it doesn't look so boring

How you made this index rotary ?

Why not just buy a spiral graph from the toy store.

😢

Don't try don't waste time and money and hard work,,,internal gear this way will not have required profile we in ludhiana India, tried this 40 years ago,,,ultimately had to go for gear shaper machine..

Abuse of calliper, say no more.

Get some real taps 🤣

это пиздец