Messages

11

Feature Requests / Re: Tangential Control A-axis...

« on: September 12, 2009, 12:08:30 PM »

Now, after week of investigation...

Please, let -0(minus zero) and +0(plus zero) in rotary axes be treated as every another digit. Now + and - relative to zero is always +.

12

General Mach Discussion / Re: Can Mach support clockwise/counterclockwise drivers?

« on: September 03, 2009, 04:44:22 PM »

IMHO, direction and step should be the same for you. Direction stays all time CW or CCW, step pulse is limited to 5ms, but you can use some unit (for example 74HC123 based) to make the pulse longer. Also you should take care about signal levels which these drivers expects. Probably PC LPT port will not suits it.

13

General Mach Discussion / Re: Rotary axis, motor tuning calculation

« on: September 03, 2009, 04:19:00 PM »

Yes. The knife tangent control. Limiting the speed of the motor will not collaborate all time with expected feedrate. Now, using tangent control, I should all time up Z before new line. (Tangent control doesn't work in circles, but this is not necessary at all). Preferred way is to treat tangent control as G1 code before next X,Y,Z movement. Difference is that my "knife" can cut when rotating. Z+, rotate, Z-, cut will give worst results. Doesn't matter how precisely done compensations in G code.

Exactly, this will be useful feature. Will hope to see it in some of next versions. Or it is present yet, but I don't know how to use it?

14

General Mach Discussion / Re: Rotary axis, motor tuning calculation

« on: September 03, 2009, 02:14:53 PM »

DONE!
After the posting I have to think and get the same result. Thank's a lot for the help.
The problem was on one another place. As usually, the motor driver PDF was wrong and I have worked all time on 200 steps per revolution.


------

Sorry, but one more question. How to say to A-axis in tangential mode to rotate with feedrate speed, not with fast move one. If this is possible, the postprocessor will be exactly simpler. Solution to limit the speed for A-axis is acceptable, but like as an "end decision".

15

General Mach Discussion / Rotary axis, motor tuning calculation

« on: September 03, 2009, 11:45:57 AM »

Hi!
Again a question about my A-axis. In motor tuning configuration screen I can add only steps per mm/inch (depends of the native units). So, I need pure degrees for A-axis. I have 1600 steps per revolution in current case. What should be the digit?
By some tests I find something like 0.55, but this is not precise. Also I want to use all 1600 steps in 360 degrees motion. With another words, 0.225 of degree should be selectable.

Please support me with correct calculation, which covers these needs.

16

Feature Requests / Re: Tangential Control A-axis...

« on: August 03, 2009, 03:01:06 PM »

Again about the rotary A axis... As I see the Mach didn't calculate shortest patch and every time uses positive direction. This is in absolute mode, because I don't use incremental and never tried. Also better will be if A axis knows negative digits. Something like this... Zero position (and machine zero) is Y axes on the circle. Possible values +180 to -180. Operators decision go trough 180 or not by check box. In one case calculates shortest patch via 180 in another, change direction regarding machine possibilities.



----- EDIT----
Exactly, Mach 3 behavior suits me. Positive value rotate CW, negative CCW. Will do in post-processor all rest.

17

Feature Requests / Re: Tangential Control A-axis...

« on: August 03, 2009, 11:19:15 AM »

Found the programming manual. Will do as you recommended. Thank you!

18

Feature Requests / Tangential Control A-axis...

« on: August 02, 2009, 06:43:29 PM »

Hi!
Is possible to add some M code with which will be possible to turn on and off tangential control for A-axis?