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Topics - nava

Pages: 1
1
a little of my system specs
96000 baud 8 bits, 1280 per mm, vel 850 accel 160
16microsteps with 2x reduction with belt drives
4.2 amp drivers and steppers.
windows 7 32

look ahead of 20

Ive been trying to reconfigure my stepper motors to get rid of some horrible harmonics so have changed the default setting they came with from 5 micro steps and 400 pp mm to 16 micro steps and 1280 ppmm. This has seemed to help so far however if I bump up the feed rate on a test arc cut (200%) of the feed rate which was 300mm/min I get a strange pulsing every second or so, I tried to play around with baud rate and the frequency which seemed to have no effect.  Its like the motors go through a slight speed reduction and then increase.  If I use the standard 300mm/min feed from the Gcode then I dont have that problem.  I have searched the forums and other places but cant seem to come up with much.  I thought perhaps it was just a lack of speed of my cpu but its not above 15%.  I didnt get to try and change the look ahead but maybe i need more than 20.  I thought also maybe its a problem of power though my pre built system says it can do up to 150 microsteps and I get no problem moving all 3 axis at the same time at the highest speed while jogging. 

Anyone experience something like this before?

2
General Mach Discussion / how to set up my 4th axis with a servo
« on: December 14, 2012, 07:30:01 AM »
I am a bit lost on where to start but I think I have the equipment and electronics to make a with axis im just not sure of how.  Im looking for some advice

so as far my setup goes this is what I have

Bf20l with 3 axis stepper motor control (all works fine)
MD03 motor controller http://www.robot-electronics.co.uk/htm/md03tech.htm
Vertex HV6 rotary table
Electro Craft DC servo motor E240 with encoder HEDS 5540
 My main 3 stepper motors are connected via mach3 using the parallel port and the card which i got for the mill which is this one
http://translate.google.com.au/translate?sl=de&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fwww.cnc-shop.mobasi.com%2F&act=url

Additionally I have an arduino I could use between a driver and parallel port.

Im not sure but Im guessing this is just for stepper motors but I could be wrong

I want to be able to connect my motor and encoder to mach but I missing something.

Either I get another stepper power supply for the board I already have or use the list above.   I could additionally buy a driver for it but then what would I use a separate breakout board for the servo signal or could I just attach it to pins on the parallel cable?



The documentation for my parallel board is unfortunately in German but if you can read German you can find it on this page

http://translate.google.com.au/translate?sl=de&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fwww.cnc-shop.mobasi.com%2F&act=url

I have suspect that if I get a driver that can accept step and direction for a dc servo motor it could work.  Perhaps someone would know of a driver that might work with my setup for the dc servo motor and encoder?

I know that might look a bit of a mess but Im keen to come up with something.


3
Feature Requests / toolpath displays
« on: May 24, 2012, 02:57:05 PM »
I would love to see some extended tool path display. I'm in the process of working out how to run a 4th axis and can't see the C axis or tell mach that C is rotated 90 to be ect(so I rename them to A).  Some improvement of options to the tool path view and work area would seem to be a handy improvement

4
General Mach Discussion / 4th axis orientation?
« on: May 21, 2012, 03:41:36 PM »
I have generated some gcode that uses 2 angular axis C and B.  B is a triunion table and C is a rotary table.  The table is locked at 90deg so the rotary acts like a standard rotary table.  In my simulation the rotary axis is therefore Y.  When I load up this gcode in mach3 it appears that mach treats the A(renamed from C) as being along the X axis.

Is there any way to change the origination this in mach?

here is a sample of the code

N2833 G1 X-36.796 Y1.262 Z-33.153 A+165.054 B+90.000
N2834 G1 X-36.824 Y1.396 A+167.364 B+90.000
N2835 G1 X-36.876 Y1.566 A+170.319 B+90.000
N2836 G1 X-36.945 Y1.734 Z-33.155 A+173.249 B+90.000
N2837 G1 X-37.031 Y1.895 A+176.097 B+90.000
N2838 G1 X-37.131 Y2.048 Z-33.157 A+178.826 B+90.000
N2839 G1 X-37.243 Y2.191 A-178.588 B+90.000
N2840 G1 X-37.367 Y2.331 Z-33.159 A-176.013 B+90.000

5
So in preparing the z height for the my tools 0 starting point with the mach3 internal mpg I'm having some strange issues I cant figure out.

Steps to reproduce

1.  I jog down to set the Z height using the internal mach3 mpg while at the same time measuring with a dial gauge(used 2 different ones at the same time)
2. Both dials read 0 and then I set z to 0(OK should now be zero)
3.  Pressing goto 0 should now return the dial gauges to 0 but instead the dials move .03mm past 0.
4.  Pressing goto 0 again returns the dials to 0.03mm
I can repeat step 4 over and over again and the dials always return to the same .03 position.  I have inputeed my backlash a few months ago(.07mm) and because the dials return to the same .03 past z 0 positron I think the backlash calculated correctly.
I also tried jogging the tool down past the dials 0 then jogging it back up to 0 before i set the soft zero on the z.  If I'm jogging up to z then when i hit goto 0 the tool is .01mm below 0.

I cant really understand whats going on here but obviously it isn't that great for setting up my tool positions.
Any insight to what may be going on would be wonderful.

I also have the same error when using my xbox controller as my mpg:( And if it helps I still have it plugged in while using the mach3 internal mpg

6
General Mach Discussion / z axis goes to Machine 0 and not soft 0
« on: January 12, 2012, 11:47:46 AM »
I'm having a little problem with setting my Z axis.  When I zero out my work piece to start a job Mach uses machine 0 on the Z axis instead of the soft 0. The machine will zero to the soft X and Y but not Z and the only thing that I have found to fix this is to first 0 out all the axis then do a restart of mach3.  Ive looked through the settings and so far cant see whats causing this  and ideas?
Here is an example of the files im loading...just the start of it anyway
%
O5000 (12MM_TUBE_HOLDER_CORRECTED.TAP)
( MCV-OP ) (02-NOV-2011)
(SUBROUTINES: O2 .. O0)         
G90 G17
G80 G49 G40
G54
G91 G28 Z0 //When the machine reaches here its at the machine z and not soft z
G90
M01
N1 M6 T1
(TOOL -1- MILL DIA 6.0 R0. MM )
G90 G00 G40 G54
G43 H1 D31 G0 X16.897 Y20. Z50. S1000 M3
M8

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