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Messages - thedude

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General Mach Discussion / Re: Strange motor speed on reversing....
« on: April 29, 2009, 03:10:17 PM »
Check that you have the same shuttle accel value in Turn as you have in Mill.


Checked it,,,, they are not the same.
Shuttle Accel.
Mill  .004
Turn 1

This could be it huh?

General Mach Discussion / Re: Strange motor speed on reversing....
« on: April 29, 2009, 02:25:02 PM »
Thanks for the reply,,
I'll change the steps, maybe to 1/4, try it, then to 1/8, play around with it a bit.  I chose half step from the advice from the hobbycncpro instructions.
Mainly it was a recommendation as a good place to start.  Also, they mentioned not to use microstepping to increase accuracy.  I suppose if I don't run the motor faster than needed, I shouldn't have a problem with missing steps.

There isnt a problem when I do not use backlash comp, (or set it at zero.)  ie.  Backlash comp is on, X set to zero and Z set to .0113.  The X doesnt have the issue (as seen in vid)  but the Z does.  but if I add say .002 to the x,, it has the same issue.

This problem never occurs when I use the machMill program, only the Machturn....  I'm wondering if it might be a software issue???

I'll change the steps and try that first..

Thanks again!


General Mach Discussion / Strange motor speed on reversing....
« on: April 28, 2009, 10:00:27 PM »
Hi all.
Using Mach3 Turn for the Lathe...
I have a strange motor speed happening when I reverse direction on my Z axis.
I do not have this issue when using mach3 Mill software tho.
I was going to try to explain it in words,,, but I could not,,so I took a video to show it.

(Build history)
Lathe is the 7X14 Sieg  (micro mark Mill.) http://www.micromark.com/MICROLUX-7X14-MINI-LATHE,8176.html

I am using the hobbycnc pro driver board.
When I first started to convert the lathe to CNC,, I set up the X axis to drive the carrage only from the threading lead screw and used the Mach3MILL software to make some cuts.....  This worked well with backlash compensation, no problems.

I am using backlash compensation, .0135" on that leadscrew at backlash speed of 100%.  I do close and restart the program with any adjustment here.

Ive since mounted a motor (now the X axis) on the cross feed, and I have mounted the Z axis motor to the Z feed.
Motors are in 1/2 step and tuned properly per dial indicator verifications on each axis.

Now I am using the Mach3Turn software as I should be.
Here is the problem when using backlash compensation in Mach3Turn vs. Mach3Mill

In the video I jog, in one direction a few times,,, the velocity and accel work fine,, BUT when I reverse direction I get the strange movement.
I have made a few part with it this way,,, and accuracy is good on most features,, but,,,, this delay is causing some issues as the X takes off while the Z is winding down,, or up....

Can anyone offer some advice on this?
Any help is appreciated

I have changed accel rates and velocity rates to troubleshoot this issue.  They do change, per new inputs, but still the reversing motor speeds are still weird.

G-Code, CAD, and CAM discussions / Re: GCode Scaling in Mach3 Turn
« on: April 28, 2009, 03:52:23 PM »
 I must have missed it in the manual.  I will look again tonight. 

Thank you Daniel.

G-Code, CAD, and CAM discussions / GCode Scaling in Mach3 Turn
« on: April 28, 2009, 02:37:52 PM »
I'm aware of the scaling in Mach3Mill, next to the DROs,,.  Where in Mach3Turn are they?  Or do they not exist?
If not,,, does anyone know how or where I can get some software to do this for me?

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