- May 7, 2015
- Reaction score
Thanks Chuck,A couple of things come to mind, and please pardon me if I'm stating the obvious. Just trying to cover all the bases.
First, of course, would be to check if the downfeed clamp is loosened. I know, it sounds silly, but I frequently tighten my clamp to make the spindle assembly more rigid during level cutting then forget to loosen it when the Z-axis needs to move. :wall:
The second would be the speed setting on the rapid movement of the Z-axis. If you are using Mach3, you can set the maximum rate of speed in the config/motor tuning menu option. I have 425oz in nema 23 steppers with an inductance of 24 milli-henrys so, while they have a lot of low end torque, they won't spin very fast. The gearing on my Z-Axis is such that it takes 48000 steps per inch of travel. It seems to run consistently in both directions without skipping steps at about 15 inches per minute but I have it set to 10 with acceleration set to 1 in per sec per sec. I keep it set really low since Z-Axis speed isn't really important to me.
I don't know how familiar you are with Mach3, but you can hold down the shift key while you press FN and Down Arrow or Up Arrow to do a rapid movement of the Z-Axis. I set my speed by setting the speed at about 50 inches per minute and run the Z-Axis up and down several times using the computer keyboard. If it skips steps, I drop the speed down another 5 in per minute and try again. I repeat this until it moves smoothly without ever skipping. Then I usually drop it down a few steps until I get the best sound from the stepper.
Hope this helps.
Yep, I'm using Mach3
My steps per are set to 1910 (after tuning) that's very strange as that is no where near the 48,000 that you have set on yours. I copied your setup with a 15 Tooth Pulley and a 36 Tooth Pulley. 2.4:1 I also confirmed that it takes 10 turns of the crank for 1" movement on the quill.
I use Mach 3 with Micro-stepping drives. The drives are set for 2000 steps/revolution and is also set for 10 micro-steps per full step.
My velocity was set rather high at 600mm/minute so I'll bring that down a good deal.
So I'm a little confused with your 48,000 steps/per. Hmmmm
The drives I am using are MSD542 from Motion control products.
What did I do wrong ?