Swifty
Well-Known Member
Blogwitch, that's the kind of device that I need. I will look into it.
Paul.
Paul.
Here's some pictures of the dividing head. I've hooked it up to the arduino and it works. More than enough torque and holding power using the NEMA 23 motor. The ratio of the timing pulleys is 12 : 60 or 1:5.
<photos snipped>
The spindle is an ER20 with a 3/4" shaft running in sealed ball bearings.
Chuck
Hi Paul,
The info I have for the P204PP is that the ID is 20mm...(OD is 47mm) Am I in error on this? Ref: http://www.timken.com/en-us/products/Documents/Timken-Ball-Bearings-Catalog.pdf (see p. 4)
Thanks,
-Vern
I just hit submit, and then noticed your edit... Thanks for the clarification. -Vern
Vern, that would be a 20.00mm shaft, so you will have to use metric bearings.
Edit. I just checked the bearing that you specified, 204PP, that's a 20mm bore. The bearing won't be .003" small on the ID, the shaft should fit that bearing.
Paul.
I've thought about making an electronic dividing head for cutting gears, but I have not the faintest idea what you people are talking about. Obviously electronics are not in my field.
Paul.
Moi aussi- which is not French for I am an Australian
Don't know what's going on, I have an ER20 straight shank holder and it measures 19.99mm Dia. May be worn a bit as I have used it a lot.
Maybe you have one that's slightly oversize, might have to polish it down.
Paul.
Here is a link to yet another version of an Arduino based index head
I have a little different "user interface" - the way of entering the steps, degrees and such. I'd like to hear/see how yours performs under the mill... I'm haven't fully tested mine yet and am wondering if the steppers will give the needed accuracy for (light duty) gear cutting.
=Alan R.
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