Messages

11

General Mach Discussion / Re: Pullback DRO

« on: January 21, 2011, 02:35:41 PM »

 I did a test and I am satisfied with the results.

Hood & BR549...Thank  you all.

Nemo

12

General Mach Discussion / Re: Pullback DRO

« on: January 16, 2011, 05:19:50 PM »

Thanks Hood!

 I'll put one OEM91 DRO on the screen , and I'll do a test with G73.
Must be more fast and better than the G83 with a Center Drill . Or not??

Nemo

13

General Mach Discussion / Pullback DRO

« on: January 16, 2011, 01:53:40 PM »

Could someone tell me what are the OEM 91 and 93 DRO?
 How do they work?
 OEM 91 is the pullback DRO?

thanks

Nemo

14

Screen designer tips and tutorials / Adding screen

« on: October 16, 2009, 02:28:12 PM »

To facilitate my work,I added two new screens to my own Mach3 screenset.
The first screen allows me to even(leveling) a board using the probe. The probe tap  three points previously chosen. The difference of level between the three points is recorded and displayed on the screen allowing repositioning of the board. The first point will be automatically set as zero-tool. The choice of three points can be made by the distance between them or by coordinates previously defined in the drawing. See picture below Nivelar_1 or a video on

http://www.youtube.com/watch?v=utn-yDiI6ms

The second screen allows me to align a side of a board for X or Y. The probe tap two points previously selected in a given axis, records the difference between them and displays the results on the screen, allowing repositioning the part.
The first point to be taped will be automatically registered as zero-tool in that axis.
This procedure when carried out in both axes (X, Y) defines the point (0,0) in a corner, depending on the chosen quadrant.
The points are defined by distance between them, or by coordinates and the choice of the quadrant area of work.
See picture below Alinhar_1 , or a video on

http://www.youtube.com/watch?v=cMwaKtLm3xw
http://www.youtube.com/watch?v=iVxZhxARmtE

Nemo

15

LazyCam (Beta) / Re: LazyCam - newbie questions

« on: October 01, 2007, 09:16:12 PM »

Hi Brian.
I want learn basics about LazyCam . Already exist some tutorial(doc or video) about LazyCam?

Thank

Nemo

16

General Mach Discussion / Re: trouble with steps or with stream pulses

« on: September 13, 2007, 08:18:58 PM »

Finally I fix the problem. I think.
After many electronics test I found the problem, which was the Optocoupler IC from step motors drivers.
After I changed all optocouplers from drivers the problem disappeared.
Great! Now my CNC is running fine and accurate.
I think that one signal probable "DIR" was retarded by the old optocoupler then the step motor driver loses "step pulses".
I don't have a scope and I think that with one , this kind of problem would be more easily set on.
Thanks Jim
Thanks All.

Nemoc

17

General Mach Discussion / Re: trouble with steps or with stream pulses

« on: August 31, 2007, 08:28:20 PM »

Thanks Jim.
I think so. I did the same maths. I agree that is the first two pulses. I think that this occur in one direction but not in the other.
I will do your suggestion.

Nemo

18

General Mach Discussion / Re: trouble with steps or with stream pulses

« on: August 30, 2007, 04:50:05 PM »

Thanks Jim for your help.
I install Mach3 again and do many experiments.
I put a reduction between Y ball screw and step motor ratio 2:1 slow down more accel and speed. I was thinking about inertia then a reduction may be help.
Changed a setup of “Pulses per” from 2000 to 4000 (ratio 2:1).
The error now (eliminate backlash) is 50% of the past 0.001”. The error is 0.0005” now.
Well the system loses pulses.
Someone know how Mach3 work with Dir Pulse and Stream of Step Pulses?
I need a help with this.

Nemo

19

General Mach Discussion / Re: trouble with steps or with stream pulses

« on: August 27, 2007, 11:34:27 PM »

Thanks for your post jimpinder.
Today I do all that you suggested , many times. Yesterday I did the same test.
- Without a conclusion.
Now, I did something radical.
I uninstall Mach3 and install my old cnc control and I was running with it now.
The error (0.001 inch) disappears. CNC runs stable and fine.
I measured the backlash that is 0.0002 inch or 0.005 millimeters. Very good .
Now I can eliminate backlash when I move in the same direction.
I’m sure that the error (0.001”) isn’t a backlash.

Jimpinder
This sounds like an electronic problem.
Thaks
Nemo

20

General Mach Discussion / Re: trouble with steps or with stream pulses

« on: August 27, 2007, 03:16:29 PM »

Thanks jimpinder.
Below answer for your questions.
You say the error is cumulative. Does this mean that you are getting 1/3 thousanth error on each move - or is the error one thousanth each move, but forward and back it just corrects itself
       - Actually, we have one thousanth each move.
What if you move to Y3 in one move - do you get the same error.
       - Yes correct.
Are you sure your error is not in the DTI.
      - I borrow one from my friend and check it . It's OK!
The fact you are getting this on all axis - and I assume you are using the same DTI,  really eliminates an error on any one of the axis and it is unlikely you will get the same error on all three.
      - Sorry , I don't understand but  I test one axis each time not all at the same time .
If you have eliminated backlash i.e. -  Y-1 to Y0 - start -  then Y1, Y-1 and back to Y0 with zero error then this would seem to indicate that all is well with your mechanical set up.
      - I do a test as follow:
      - Move Y-1 to Y0 to eliminate backlash then install DTI at X0 named hear "P0".
      - Run Gs below.
            G20 G90
            M98 P123 L50
            M30
            O123
            G1X1
            G1X0
            M99
      - After many repetition of subroutine  the called "P0" is far front DTI and don't tap it .
      - I think that the system lose pulses/steps in one direction but not in the other . That is corret?

Thanks

NEMO