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South Bend metric transposing gears

The McMaster files might be perfectly fine but its hard to be certain. I've downloaded lots of their fasteners & hardware. Some take shortcuts on the threads for example & others seem like they would be spec because you can physically verify dimensions. I think they offer these files more to build CAD model assemblies & save you the effort of drawing common parts. And lets face it, it encourage you to click Buy while you're there as opposed to make by using their free file. McMaster doesn't make anything themselves likely pulling those files from gear suppliers, where you can find similar CAD models or at least accurate outlines. But again, they may be simplifications when it comes to details like root radius.

If you go to Youtube & search different keyword permutations of 'Solidworks + gear + design + parametric'... you will find a handful of videos that show step by step using classic gear formulas. I would think Fusion could replicate this. Maybe not a generic parametric tool but for sure a gear of interest. From the fusion link someone provided that kind of looks like what they did - built an integral utility tool.

Lastly I don't know much about 3d printing but I've heard people have had to make several fudge factor allowances for both absolute dimensions (4.000" CAD = 3.970 real life) and aspect ratio (a 4.0x4.0 CAD square is 4.00x3.95 in X&Y). These are just BS examples but you know what I mean. If its supposed to be circular & you have printed something eccentric with teeth superimposed, it might effect running. I dont know what kind of tolerances are acceptable in this application or if the material just wears in, but maybe do a simple donut print test to verify?

I've always wanted to know how much an EDM gear would cost to cut from a blank (keyway included!) but its like that $$ saying.... if you have to ask.....
 
South end 9”, 10k, and Boxford 9” and 10” end gears (change gears) are 18 dp. This is not a standard pitch diameter. Standard is 12, 16, 20 d.p.

This is common with lathe makers change gears, my Harrison L6 has 14 d.p. Change gears. They use non standard pitches so you have to buy from them at inflated prices, or make your own, or look into an electronic lead screw drive.
 
I vaguely remembered buying a cutter for making transposing gears. I found it and am going to try cutting a gear out of delrin. I don’t have a big enough piece for the 127T but can do the 100T. I don’t relish the thought of cranking the mill bake and forth 100 times though so I might get sidetracked trying to automate the process.
 
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