Y axis is making X axis stall...!!

**Jonathan** · 20-10-2011

http://www.mycncuk.com/forums/showth...y-power-supply

**John S** · 08-10-2011

Jazz,

The same with over rating components because of bad advise. Following a conversion at the moment on another form of a Taiwanese 636 milling machine.
The guy is using 25mm ballscrews and 1640 oz in type 34 motors, unless he can hit that with 10,000 volts it will crawl but bigger is better - yes ?

End of the day he'll get as much 'useable' power as a 600 oz/in motor and probably twice the speed.

**JAZZCNC** · 08-10-2011

Originally Posted by John S

Jazz,

The same with over rating components because of bad advise. Following a conversion at the moment on another form of a Taiwanese 636 milling machine.
The guy is using 25mm ballscrews and 1640 oz in type 34 motors, unless he can hit that with 10,000 volts it will crawl but bigger is better - yes ?

End of the day he'll get as much 'useable' power as a 600 oz/in motor and probably twice the speed.

Ah ha ye and it was probably the supplier who told him he needed that.!! . . .. . . . The same someone who sold a guy I know 12.5Nm for his Z axis.:whistling:

**fasteddy** · 10-10-2011

Hi All..

Been out the loop for a couple of days but I note some fascinating posts from you cnc guru's.. Love the one about Mach and kernal speeds, have popped mine back down to 25KHz and it seems fine..

The sort of speeds you guys are talking about seem more than fanciful to me at the moment.. Have been running my machine at 1.8mts/min max during all these other problems, now that I can achieve more, I still dont dare go above 2.5mts/min due to the bent ballscrew shaking the machine so much.. I did try 4mts/min which the motors seem to easily achieve, but shaking was so severe I thought something was going to rattle off the machine.. Am going to try straightening the ballscrew today, will let you know how I get on..

Steve..

**fasteddy** · 20-10-2011

Ok...

Seems my run of bad luck is continuing..! Got an EP002G1 psu from a fellow forum member, but I have measured 58.8v output unregulated..! I know this is much higher than it should be (42-46v on the spec sheet).
This is too much for the drivers I am using which are limited at 50v (already blown one of them).. I know there are many out there that have these psu's and am wondering if there is anything I can do to 'dial' down the voltage? Will pop the cover off a bit later and see if there are any pots but this is like letting a road digger perform brain surgery and I would prefer some advice before rummaging around in it..

Steve..

**John S** · 20-10-2011

Are you just putting mains in and taking pos and neg out ?

Reason I ask is I have used quite a few and done it this way and they have put 42 volts out, rock solid.

If you feed a voltage into some of the pins you can vary the voltage but only higher. I just use 4 wires, two in, two out.

**fasteddy** · 21-10-2011

See that red glow on the southern horizon? Thats me blushing with embarrassment.. Turns out the 'budget' pp3 battery in my multimeter is only kicking out 6v so it was making all the readings out... Sigh... New battery and voila, all the voltages measure as they should do..

Sorry for flapping, will get on and bugger summat else up now...

Steve..