Re: Variable speed motor control for 9X20 lathe spindle was- [CAD_CAM_EDM_DRO] Slightly off topic - DC motor control for 9X20 lathe

The lead screws will be replaced with ball screws for the CNC conversion.  What I'm really concerned with is setting up a variable speed drive for the spindle.
 
Jack

--- On Sat, 1/3/09, JanRwl@... <JanRwl@...> wrote:

From: JanRwl@... <JanRwl@...>
Subject: Re: [CAD_CAM_EDM_DRO] Slightly off topic - DC motor control for 9X20 lathe
To: CAD_CAM_EDM_DRO@yahoogroups.com
Date: Saturday, January 3, 2009, 5:03 PM






In a message dated 1/3/2009 3:43:11 P.M. Central Standard Time,
freshwatermodels@ yahoo.com writes:

I recently purchased a used ENCO 9X20 lathe and plan to change the
motor to variable speed drive and X-Z axis to CNC with steppers.<<
Why?

I am wondering if I can use a variac with a bridge rectifier to produce
variable dc voltage to run a DC motor?<<
Why?

Is there a better and affordable way???<<
Start off with a viable machine for the purpose. How about the lead-screws?
SURELY those on the ENCO are "ACME" with at least 20 mil backlash! For
variable speed of a DC motor, do it with variable pulse-width. Better, and
PROBABLY more affordable in the long run.

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