GearHeads Forum

For those of you who haven't seen it:

https://hackaday.com/2019/01/16/new-con ... -and-cams/

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I've also considered some other ideas, like having a set of circular gears driven by the same input, connected to the output by a pre-tensioned drive shaft that would be able to cope with the varying position of the output gear but would keep enough tension to have it chase the input gear when ...

It's occurred to me I've been accidentally cryptic in all of this -- what I'm trying (again, foolishly) to do is develop a way to create a crown gear or rack gear using an engraving laser.
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The original post had me wondering whether you wanted a "polar" height map or "rectilinear" height map ...

I am looking for some idea of which 3D print head to buy or build.
Drawings of a proven design would be awesome since I have the machines to make one from scratch.
If not drawings then a link to a head that works well and is durable would be appreciated.


I have a Prusa I3 Mk2 which works pretty ...

MBrez wrote: I'd like to see that printed.  Ever try shapeways.com?

... only took me 2 years to get around to it. :/

My first thoughts on this are to calculate based on pitch diameters (equivalent to using un-toothed, smooth wheels) then look for a common factor for all the circumferences to decide on a tooth size. Iterate until the size/number of teeth is within machineable limits.


You can get approximate ...

Stojan wrote: So who won the $5  ...

Dunno.  You probably got your money's worth if you hadn't seen Oskar's channel before.

I'm still chewing on the math problem.

This video has more 'practical sense' to it.

https://www.youtube.com/watch?v=M_BUn4TDns8

BobL wrote: Art;

Waterjet appears way too messy? 

They seem pretty OK on the mess side, but are more expensive to run than lasers.

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By exact, I mean the pitch circles of the four gears are tangent and not slipping.
By non-trivial, I mean the four gears have four different radii, and the number of teeth is not zero or infinity.


https://www.youtube.com/watch?v=3iyO-OvIS_k

It's pretty easy to find exact solutions with 4 ...