Cut any gear with just a slitting saw 

Tune in next week when Andy creates an additional identical gear with a rusty old worn hacksaw blade and a guy named Pythagoras

Believe me, it will not worth the investment if what you need is just one or two gears of specific dimensions.

@@trevorvanbremen4718 I need at least 3 different sizes of gears. Module 1, DP16, and DP18 with at least two different pressure angles between them. Good quality US-made gear cutters are around going to be around $50-100 each, minimum. I can get sets of import gears from Asia for around $100 per set, but the quality is unknown. Some of the DP imports are marked for 14.5 degrees, which is what I need, but are really 20 degrees, which will eventually damage the original gears in my machines. On top of that, how many gears do I really need? At least a set of metric transposition gears for each machine, which is only 6 gears at the moment. But they're 127 and 100 tooth gears... Those would, indeed, be more labor intensive using his method, but still much cheaper. Buying the gear cutters in sets so I could do any tooth count of gear in the sizes I know I need now is going to be much more expensive, but cost at least somewhat less time. What happens if I need another size gear for any reason? Just one, or just a few... One of these days maybe I'll know the answers to those questions, but for right now, accumulating knowledge of the various ways of doing this is good. And I have slitting saws in an assortment of sizes... If you know what you need, the answer is simple. If you do not know what you really need, things are a lot less simple! ;) Bill

@@jimqossim2554 works for me b/c I keep braking the same gear.

@@mechanician7735 I would rather upgrade the the Mill to CNC actual 2 axles would be enough Turntable and the feed. You have to setup each cut manual but the cutting itself is automatic.

That's very interesting. I wonder could it do prime numbers of teeth? Perhaps if you had a prime number as one of the programming gears?

Nice work Matey! Good to hear of the good old - new - days!

Thanks very much! That's praise indeed!

AGREED! It takes effort to go through the math to come up with a finished generated profile. There will also be those that think just go out and buy a gear cutter set ....which they certainly can do, but when there is only one gear to be done, and a guy has both time and an interest in figuring out a way machining "at home" and not ending up with shelves of cutters that will only be used once ......it is the journey that is far more interesting. Nice job and thanks for sharing the spreadsheet!!! .

Same here.

Maybe this video will get you closer to doing this kind of work. This might have been one of the purposes of the video in the first place. .

hes theb most amazing problem solving machinist ive ever seen he could make anything with just 2 tools 1 actua;lly im really surprised hes not using his lathe

Same here, way above my pay grade.

Amazing

AGREED. Also, if people have a CAD program in their home shops, they could also use some modeling to "fine-tune" the cuts get the end result involute closer to spec. .

Thanks! I'm glad you appreciate it!

@@AndysMachines ❤️

Yes, It's just generating the curved tooth profile from successive straight cuts, the only difference is that a hob takes many more cuts per tooth.

Thanks! 😁

Well . . . two out of three ain't at all bad! Cheers.

Yes, sorry about that. I think you could get by with a crayon (and they fit in smaller collets).

I'm glad you appreciate it, thanks!

Thanks! Yes, I've made 'hobs' like this before and they are very useful. They look like a stack of no.1 involute cutters and you use them the same way, indexing one tooth (or fraction of a tooth) at a time so no need for a proper hobbing setup.

Thanks for the comment! Yes, I do spend a lot of time on my videos, I think the average person browsing through RU-vid doesn't realise how much effort goes into most of what they are watching. I tend to keep music to the minimum these days, as in the past I would always get a few comments saying whatever music I used was terrible! It's very subjective I guess.

Glad it was helpful!

I thought I saw somebody do something similar on a CNC machine, I was trying to remember where, it must've been you! CNC is the perfect way to do this as you can take multiple cuts and end up with a better profile with fewer facets.

You just got yourself a new subscriber friend

@@AndysMachines Have you considered a mix of this and a purpose made d-bit? There's been a few people make and use purpose ground D-bits (click spring is one), but they have a lot of work to do if asked to remove ALL of the metal. I can see using this like a roughing cut (as in those first 2 cuts up to about 9:30) where you made a "cartoon gear" and then using a D-bit to finish it off. Even if you have proper gear cutters using this to rough cut would makes sense as it would reduce the work of those expensive cutters. You could get a lot more life (as in more gears) out of those cutters. it would even work for those hobs you make by reducing their work to just the gear profile. This is really clever.

@@AndysMachines I think my last comment got deleted. For those following along I just pushed a new video and added a github repo with my updated code.

ooh, that'd be interesting to see