Making gears.

  • Thread starter Thread starter Hukshawn
  • Start date Start date
Hukshawn said:
Nice video. I learned.
So I'd need two gear cutters if I wanted to cut two different sized gears, depending on their size.

I have some pondering to do. I need to make a bevel gear to turn 90 degrees for a knee feed motor.
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Everyone who has lost a chuck key needs to make a bevel gear. It is not easy.
Buy a hand-crank drill and repurpose the parts, or get a hobbyshop differential,
or even purchase from SDP either bevel or worm gearbox (both do the 90 degree thing,
but worm gets you a largeish ratio).

SDP prices divert my attention to the hand-crank drill that I'm not really using...
heck, a junkyard car differential would have good heavy bevel gears.
 
I would need the gears to be 1:1 or close. Or at least the small gear to be 1.5-2" in diameter.
 
Hukshawn said:
I would need the gears to be 1:1 or close. Or at least the small gear to be 1.5-2" in diameter.
Click to expand...

Just saw a couple of Yamaha XV535 front gears on ebay, item number, 121731161402

They look exactly the kind of size you're after. These bikes have been in production for years, breakers are full of 'em.
 
Spider gears in a car differential are bevel gears with 1:1 ratios. diameters are in the range you need. Choosing a light duty car or heavy duty truck can fine tune the size you get.
 
You can also get some 90 deg bevel gears from an old outboard motor. you can often find one where the motor is blown but the wet end is ok, should be available cheap.
 
If building a geared assembly from scratch actually making the gears yourself would be terribly slow and costly.
If as you say there is no required pitches or diameters then stock unfinished bore gear blanks and pinion wire are the way to proceed, these are available from many sources. Making gears without dedicated equipment is never as cost effective as buying them from a company that only makes gears. If what is needed is not available then making them is the only option.

For example
http://www.sdp-si.com/products/gears/Pinions-Metric.php
https://khkgears.net/new/bevel_gears.html
https://www.mcmaster.com/#bevel-gears/=1dmhw8f
https://us.misumi-ec.com/vona2/mech/M1000000000/M1006000000/
 
benmychree said:
Bevel gears are not easy to cut, it takes a special cutter, made for bevel gears and not commonly available, and also it takes three cuts at minimum for each tooth; the cutter makes the small (inner) end of the tooth space, then the cut is offset and the tooth rolled and another cut taken on each side of the tooth space to size the outer (big) end of the tooth space. I have only done this once, many years ago to make differential pinions for a 1901 Toledo steam car. If you need bevel gears, best to buy them as stock gears.
There are 8 gear cutters in a set for each diametral pitch in order to cut the full range of teeth numbers, that is from 12 teeth to a rack tooth; that cutter cuts 134 to rack, so if it is not intended to cut that large a number of teeth, it might be dispensed with, but having the whole set is a good thing.
Click to expand...
Any idea where I might buy a 10 DP #6 14.5PA bevel gear cutter?
 
Bevel gears are among the most difficult item you can make. There are three different angles in the length of the tooth and varying thickness along each. Three-dimensional calculus would be easy by comparison.
 
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