Messages

91

General Mach Discussion / Re: Getting small movements which not supposed to..

« on: May 29, 2013, 12:24:27 PM »

Remember I said the Step per was 33 at the beginning of this post, I realized Mach is causing it, so I re-installed Mach3 just before I uploaded the pictures in the last post.
The Dc servo drives are ok, I think is the software that is causing the problem, could it be the Mach3 post processor in VT?
I will try this tomorrow, open a example file in VT (Visual Turn), the file is in inch, change unit to metric, then scale it up the diameter of the part from 7mm to 50mm:
http://youtu.be/WF1sAixhQMY

92

General Mach Discussion / Re: Getting small movements which not supposet to..

« on: May 29, 2013, 05:09:33 AM »

For the DC servo drive I didn't change the value so it still CAM_numerator = 1 , CAM_denominator = 1.

Mach3 Motor Tuning:
X:

Z:

In MDI I typed G00X-10Z0, then watching the X axis travel toward the stock direction by 10mm.
Video:
http://s1204.photobucket.com/user/cncfreakcncfreak/media/BVB25L%20cnc%20conversion/M4V05916_zps171cd6de.mp4.html

I also included a gcode output from Visual turn.

93

General Mach Discussion / Re: Getting small movements which not supposet to..

« on: May 29, 2013, 02:28:23 AM »

I chaged the value of CAM_numerator: 1 to 8, CAM_denominator:1 to 3 then start....
I'm still suspecting the cause is Visual Turn not the tuning....

94

General Mach Discussion / Re: Getting small movements which not supposet to..

« on: May 29, 2013, 02:02:24 AM »

I switch to another PC which has a RS232 on board, got connection between the drive and pc and here is what it looks like:





sorry for the 2 image screen shot, don't know how it happened..

95

General Mach Discussion / Re: Getting small movements which not supposet to..

« on: May 29, 2013, 01:15:58 AM »

Sholdn't 1:1 be the default setting?
Installed Pro tuner, but can not connect between the DC servo drive and PC due to bad connection RS232, the PCIe RS232 card from Uptech.
Need to sort this out 1s.

96

General Mach Discussion / Re: Getting small movements which not supposet to..

« on: May 28, 2013, 08:52:56 AM »

Thanks Hood, will do the tuning tomorrow.

97

General Mach Discussion / Re: Getting small movements which not supposet to..

« on: May 28, 2013, 07:25:21 AM »

Hi Hood,
             I'm using this drive:
http://www.leadshine.com/Product_Show.aspx?ID=79
Ok I thought this drive do not have electronic gear ratio, the stepper driver from Leadshine use dip switches for micro stepping so I thought the DC servo drive might have the same for electronic gear but not.

98

General Mach Discussion / Getting small movements which not supposet to..

« on: May 28, 2013, 01:41:49 AM »

OK below is  a link of my converted cnc lathe:

http://youtu.be/Ws-0u15YJxE

Got some tuning issues here, when I run Gcode from Visual turn, the movement is not 1:1, but when input let say G0X0Z100 @ MDI, the Z axis does move to 100mm.
The DC motor encoders' are 1000 lines.
For X axis: both gears are T22, which is 1:1, so step per = 1000 x 4 (1000 x 4 for quadrature) =4000/rev.
1 rev  = 5mm therefore 1mm = 800.
Currently the X step per = 33 not 800. If I use 800, the X axis would exceed travel limit...

help..

99

General Mach Discussion / Re: My 1st cnc lathe conversion, spindle suggestion.

« on: May 27, 2013, 08:16:03 PM »

Here is a video of Visual Turn to Mach3 Turn:

http://www.youtube.com/watch?v=pVPIHbZNI3k&feature=share&list=UUpqKQljKkdBanamxgJSCuog

I'm not getting much support from Mecsoft forum, so I will ask my questions here:
I'm looking for  someone who has used Visual turn for help, please drop a note here if you use Visual Turn.
From the video link above, can someone point out if I have Mach3 setup correctly?, I'm a bit confused on cnc lathe's X axis and Z axis Positive and negative direction, for X axis, is it correct that when the cutter moves away from the stock is Negative? and For Z axis, when moving away form the stock is Positive?
Need some basic intro. on cnc lathe.

thanks,

100

General Mach Discussion / Re: My 1st cnc lathe conversion, spindle suggestion.

« on: May 25, 2013, 08:41:04 PM »

The material is a piece of Brass rod.
Will show a video clip of Visual Turn simulation sometime later.