Gallery, Projects and General > The Design Shop
Bevel Gear Mill
Joules:
Now this is intriguing to watch, note the hob seems to have two teeth offset so it can machine each side, not sure about the profile at the end. As the gear is very broad the tooth profile almost looks like a tapered Acme form. A blunt Meccano gear
vtsteam:
It doesn't look like the spindle changes its vertical angle. If so and there are two teeth they would have to move towards each other as the mill rotated into the cut, making a tapered space.
One possibility for achieving that might be a rotationally fixed core spindle acting as a tapered cam, inside an outer rotary spindle holding the teeth. The inner spindle driven by a linear actuator. That might force the teeth together or apart at a timing and degree determined by the CNC program feeding that cam.
I dunno, maybe something like that......
vtsteam:
I wonder if you could have a cnc "wobble spindle" to cut both sides of the tooth space in one revolution? :loco:
WeldingRod:
I think spiral bevel gears can be hobbed... not totally sure, though!
That would be even more complicated ;-)
Sent from my SM-G892A using Tapatalk
vtsteam:
It might actually be easier.
But this is getting to the point where my brain hurts!
I'm pretty sure the two things I will be trying out are a mill (possibly mounted on my new lathe) with involute profiled teeth (probably with a homemade cutter) and a zinc alloy casting from an existing bevel gear. Those seem like the simplest (and quickest) for what I have on-hand for equipment and capabilities.
The rack tooth generation method has great appeal, so maybe some-day I'll try that, and likewise building a hobbyist gear hobbing machine like the Jacobs or the JS Eley machines -- both shown in older Model Engineers, has always been something I wanted to do.
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