Sprockets

[ArtF]

Bruce:

  This is exactly why its hard to cut a sprocket, most people wont believe how
much the slightest variation in tool size can make it not tooth. The higher the number of teeth
the harder it is. any error is multiplied by 60 in your case for example.

  Yes, Id do exactly as you suggest, its why I use a scale factor of 98-99% in 3d printing pulleys..

  If I might suggest though, just use a piece of 1/4 plywood or even masonite and machine a test
whenever you do a pulley or sprocket, adjust from there. Its easy , fast and cheap to
do tests , and I highly recommend it.

  Thank you for telling us how its happening, doesnt surprise me much you cant tell them
apart easily. Im willing to bet your next one accepts the chain easily, usually, subtracting
just a bit form the tool is enough to make it work..

Art

[bruce]

Third time is a charm! (plus lots help from the forum). :D
I re-did the G-code via CamBam and as was suggested in that forum I put in a -0.01 inches for
roughing clearance and that worked. I now measure root to root diameter of 4.633 inches and the
chain rides the sprocket no problem.
So next time I will pay close attention to the root to root diameter as shown on the Gearotic screen
for DXF.  ;D

[ArtF]

Bruce,

Great!. And good advice to have on here, GM puts out exact sizing as it sees it and leaves no
clearances. I do always advise using cheap easy material for testing sprocket and pulley code,
most have no idea how picky a sprocket or pulley can be, but error multiplied by teeth can
be a terrible thing.. :)

Glad to hear she's running for you..

Art