Gallery, Projects and General > How to's
Cutting Spur Gears -- A neat technique
PekkaNF:
Often tool steels temper ok, without complete cycling...Ie. Hardening, but you don't let it cool completely, just when water does not boil anymore, lift it out and let residual heat to do tempering. Some guy's at the knife making class were pretty good at this.
I did the two step process and first blade went fine, second had wery thin blade and I got bit bluish near tang and straw on the tip. I was aiming in-between, but it became ok knife. Not perfect, but not dog either.
Pekka
xo18thfa:
The 16-tooth pinion cuts in the same general manner as the 52’s. The notable difference is that the hub is integral, rather then hub less.
Change out the 52 tooth indexing gear on the dividing head and replace it with a 32 tooth. During machining, skip every other tooth to get 16 divisions.
A 16 tooth, 48DP gear has a rough stock diameter of exactly 3/8” which is convenient. Use a 3/8” collet to chuck some 3/8” stock. Cut as before.
With the dividing head set up I did some 32 tooth gears too.
Chuck the 16 tooth gear in the lathe and turn a hub. Tap for some set screws and it’s done.
These gears are going into a scaled up Ernest Glaser “Cracker”
They mesh perfectly. The chassis rolls smooth as silk.
Observations:
- Helicron's method is a great way for cutting gears. Simple to follow, simple to do. A single cutter rather then a set of 7 or 8 is so much better.
- My lathe is not rigid enough to make the cutter blank as he shows. So I went with the single tooth cutter. Perhaps feeding the lathe bit in at an angle would be better then plunging straight in as I did.
- Overall grade: A-
sparky961:
Nice work. I definitely like the idea of using a rack-shaped cutter over the use of a specially shaped single point tool. Are you able to get an extreme close-up picture of the resulting tooth profile?
As for the lathe not being rigid enough to cut the cull diameter, this is possible - even likely. But, I wonder if you couldn't get the result you were looking for either by turning the speed (RPM) way down. Feed as quickly as your lathe will allow with a sharp tool. Another possibility is to rough out the grooves a bit first with another tool then come and finish using the above parameters.
... Or go CNC and peck at it using a few plunges. Too finicky for manual, though some might attempt it.
PekkaNF:
Those gears look very nice. Very good work and very nice info.
That method looks worth trying...hmm..where do I need some gears?
Pekka
krv3000:
I see a project for me one of them dividing heads
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version