Re: Servos', what type, what torque?

David,

My mill, which is slightly bigger than yours, came from the factory
with 40 ftlb servos. That's about the right size for your machine to
get decent rapid speeds.

Replacements for my 40 lb DC motors cost around $800 to $1K each
depending on source. My motors are Baldor, SEM makes an exact
replacement for a little less money.

BTW, if your use is beyond hobby type stuff, I suggest buying a
complete retrofit kit instead of the DIY variety. You'll be money
ahead in the long run and won't have as many hassles to deal with.
You'll still have the hassles, just not as many.

Doug

--- In CAD_CAM_EDM_DRO@y..., dpresto3@y... wrote:
> Hi all,
> I have a Chevilier turret mill which I intend converting to cnc
using
> EMC. I have no experience with cnc, but I have been convinced that
I
> should use servo motors for smoothness of opperation i.e. no stair
> stepping in gentle curves and tapers etc. I've been checking out a
> few sites and there's reference to a/c, d/c, brushless motors etc,
> and I'm a little confused about what type I should be going for.
The
> torque level is also an issue which I'm not sure about, the machine
> is fairly large, the table is 50" by 10", much the same as a
> Bridgeport. I will be using x,y,z and at a later stage a rotary
> table. Any suggestions of what specification motors I should use or
> discussion of the pros and cons of the different types would be
> appreciated.
> Thanks
> David Preston