Wiring for joescnc x axis ?

[WhistlePig]

In an many photos as I have seen I have always noticed two steppers and two leads screws for the X-axis, is there any special wiring when two steppers are driving two screws to help prevent lost steps ?

I have keling steppers 425/oz and the keling 4030 driver and I getting about 20 in/min jogs, much more than that and I get lost steps.

I am not seeing any real heat problems, and I am set to full step on a 3/4 * 10 pitch lead screw running 6 foot long. Seems to do a bit better on the y axis.

I most cases I am going to err on the side of torque, but was wondering if I should be seeing a bit more speed than I am getting ?

Thanks !

[ger21]

Try 1/8 or 1/16 stepping. Full stepping is prone to resonance, which will cause lost steps. I'm assuming you mean 20ipm, and not 20 ft/min? The 10 TPI screws will severely limit your speed, but you should be able to get better than 20ipm. Most people use 2 or 4 turn/inch screws for more speed.

[WhistlePig]

Thanks Gerry,

I will give it a shot.

In another thread I saw a raging debate on hooking two motors to a single driver, as I have done, would that (also) be an issue ? I do have an extra 4030 driver that I was saving for replacement/4th axis but if that will solve the problem so be it...


Thanks Again,

[ger21]

That may cause a problem. I've read that two motors on one drive only works at lower rpm.

[WhistlePig]

Originally Posted by ger21 That may cause a problem. I've read that two motors on one drive only works at lower rpm.

While I haven't tried the micro stepping yet (obviously I don't really need more steps per inch using a 10 pitch lead screw but I will give it a shot..), adding the other driver did bring me up to 48ipm with no load but no lost steps. I backed it off a bit and ran a job that seems to test the velocity a bit at 36ipm with little issue, a big improvement !

Thanks !

[ger21]

Originally Posted by WhistlePig While I haven't tried the micro stepping yet (obviously I don't really need more steps per inch using a 10 pitch lead screw but I will give it a shot..),

Higher microstepping makes the motors run smoother, and reduces resonance which is a major cause of lost steps.