Re: [CAD_CAM_EDM_DRO] NEMA 34 to NEMA 42

Michael Larson wrote:

>I just got a Wells-Index CNC 700 and I'm looking into converting it to
>servos.
>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7511611969&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1
>That's the ebay listing of some NEMA-34 frame servos that would be just
>about perfect. I know I could go cheaper by modifying surplus treadmill
>motors or by keeping a watchful eye on ebay, but these look like they're
>more or less turn-key (a huge plus). Anything I should know about them?
>
>The problem is that the Wells machine is coming with NEMA-42 steppers in
>place. What's involved in adapting the 34 frame motors to the 42
>mount? I looked up the spec sheets on the two, there are different hole
>patterns (2.875" square, 34; 3.5" square, 42) and the shaft diameters
>are different (.5" vs .625").
>
>

If you have a lathe, making adaptor plates for the motors should be easy.
Is the Wells-Index a direct drive or belt drive? If belt, then just get
a new
motor pulley with the right bore. If direct drive, the best way is to
buy a new
coupling that can be bored out to fit the two shafts. You might also be
able to
turn a sleeve for the motor shaft.

>
>

Jon