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My humble pinions

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Steve Crow08/12/2021 16:18:24
308 forum posts
191 photos

I spent the weekend cutting gears.

There are 3X12, a 14, 15, 16, 18 and a 20 tooth, all Mod 0.3.

pin1.jpg

More sizes than I really need but setting up for pinion cutting is a bit of a pain so I thought I would "future proof" my parts box. You never know when you might feel a five-speed gearbox coming on.

Steve

John Haine08/12/2021 16:22:57
4643 forum posts
273 photos

Nice!

Brian H08/12/2021 16:29:15
avatar
2312 forum posts
112 photos

Hello Steve, nice work. What are they intended for?

Brian

Steve Crow08/12/2021 16:55:30
308 forum posts
191 photos

Thanks Brian, I will be using some for a 1/12 scale V8 for the cam gear train and some more for a tumbler reverse gear in the matching gearbox.

Also I may use some for motion work in a clock project and to make a spur gear differential.

Steve

Nigel Graham 208/12/2021 17:57:12
2056 forum posts
28 photos

Fine work!

'

May I make a suggestion applicable to any divided and parted-off batch-work, such as hexagons, not only gear-cutting, in that style?

I found it better, if possible, to make initial parting-tool grooves in the appropriate places first, to very slightly below the roots of the features (spanner flats, I think I was making).

Then perform the milling, which does not mind working across grooves provided you go steady with the break-throughs if using a slot-drill.

In this way the parting-off is never on 'orrible interrupted cuts.

Steve Crow08/12/2021 18:11:26
308 forum posts
191 photos

Thanks Nigel, I did initially consider pre-parting them and I now wish I did for a few of them.

My problem is, apart from half a dozen gears, I don't know how thick I might want any other pinions to be.

I hate parting off gears. The teeth act like a musical box with a loud high pitched whine.

Vic08/12/2021 22:22:02
3062 forum posts
8 photos

Nice job and I agree with the sentiment of making a few more than you need. wink

Jouke van der Veen10/12/2021 14:25:57
171 forum posts
17 photos

Parting off with a circular saw in a mill should avoid the “musical box” effect.

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