Subject: Re: torque motors / power feed question

From: Andrew Mawson <[email-masked]>
Date: Tue, 03 Oct 1995 16:09:22 GMT

> I recently came into some 60 in/oz 120 VAC reversible "torque motors"
> that appear to free-run at about 300 rpm, and per their name, exhibit
> constant torque from stall through this free-run speed.  Thinking of
> adapting one to be a power X feed for a mill/drill, but I have no idea
> of the useful speed range for the feed (.1" pitch lead screw) nor of
> the torque required to reliably feed it.  Geared down 5:1 to 60 rpm
> this would yield 300 in/oz, that is probably in the ballpark.  What
> feed range is worth accommodating?  Any suggestions on the topic, 
> much appreciated.
> 
> 
Bob,

I sucessfully ran an imported Tiwanese Mill /Drill on CNC using
300 oz/in stepper motors for X & Y, and 150 oz/in on Z.

150 oz/in was not sufficient for table feed when taking a cut.

This was direct coupled to the feed shafts.

-- 
Andrew Mawson ------> [email-masked]
Bromley, Kent. 0181-466-5582

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From: [email-masked] (Bob Powell)
Date: 3 Oct 1995 07:45:24 GMT