Re: [CAD_CAM_EDM_DRO] Re: Spindle alternative from noise view

Danny Miller wrote:

> http://cgi.ebay.com/1-5KW-AIR-COOLE-MOTOR-SPINDLE-ENGRAVING-MILLING-GRIND_W0QQitemZ220406174727QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item33513b5407&_trksid=p3286.c0.m14
> <snip>Got no idea how I'd even mount it though. That spindle is just round
> all the way around, with no place to bolt to. I guess a mount would
> need to be milled that clamps it all the way around, but the clamping
> force may cause the head angle to vary from completely true with the
> axes. Being smooth and round, I fear that spinning inside the mount
> under high torque loads might actually be a possible problem.
>
> Danny

Of course, asking the vendor how to mount it might be better than asking
people like me ;^)

It appears that in some pictures there is a round hole for a dog or pin
which locates the spindle both to limit rotation and for protrusion. A
bored clamp (take a casting and bore out the hole to the spindle OD)
with a dog point screw (locates the spindle vertically and prevents
rotation) and a "split cotter" or a "pinch" clamp (less desirable but
simpler) should work well. As long as the dog or pin is close, any
rotation will tend to locate the spindle with good repeatability, but
0.005" of slop there shouldn't matter much here. On the other hand, the
"split cotter" or "pinch" clamp should be able to tightly hold the
spindle without the locater.


--
David G. LeVine
Nashua, NH 03060