What controller are you using? I need one able to handle a 110 volt DC, 1.5HP
treadmill motor. My 9x20 CNC conversion is on hold due to a lack of motor
controller.
For running the saddle I picked up a ball screw linear actuator exactly the
right length. It's pitch is 16mm per turn so I have a 2:1 reduction cogged
belt. Full stepping on a 200 step motor will get 0.04mm and half stepping will
get 0.02mm resolution on the saddle. That should be good enough for many
things. A 400 step motor would of course halve those. The 200 step Slo-Syn on
it is rated 5% accuracy so trying any finer stepping likely wouldn't make the
actual positioning any better.
I used some corner brackets to mount the square body of the actuator to the
front of the lathe and made an aluminum plate that bolts to the drive end of
the actuator and the left end of the lathe bed to take thrust loads.
I am attempting to do this on the cheap. I picked up the lathe for only $50,
hardly any use on it. The linear actuator cost me more than the lathe. IIRC I
paid $50 for the treadmill just to get the motor. Pieces of the motor mount and
treadmill frame got cut and welded to form an adjustable mount on the back of
the lathe. The original spindle pulley is turned down to press the treadmill's
driven pulley onto. I did have it running with one of those little $19 PWM high
voltage DC motor controllers from eBay. Problem was it couldn't be run too fast
without turning the fuse into a light bulb, or a flashbulb. ;)
I wanted to get a Denford Orac, until I saw a forum thread showing a teardown
and retrofit of one. All those are is an 8" swing Compact 8 clone with the back
3rd of the cross slide cut off. I did use that as inspiration for milling out
the saddle to make room for a wee little ball screw nut. I'm keeping the full
length of the cross slide to make it more useful, especially if I use gang
tooling plates.
From: Cecil Thomas <wctho...@chartertn.net>
To: emc-users@lists.sourceforge.net
Sent: Sunday, January 1, 2017 9:39 PM
Subject: [Emc-users] Inverting the PWM signal to mesa 7i78
I am running a cnc'd jet 9x20 lathe with a treadmill motor and dc
motor controller with a 5k pot for speed control in manual.
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