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General Mach Discussion / Re: Tangential Knife Setup
« on: December 09, 2009, 06:36:03 AM »
Hey,
Iam using Mach on a tangential knife table.
My Z axis is pneumatic so in the config I have selected 2.5D. As there is a time delay for the ouput to activate a relay then to work a actuator what I have done iin my gcode set my z+ to 200 and retract to -200. The way 2.5 D works is that any Z value in the minius ie -1 the output is activated. The +200 down to -200 up when using feedrates of 5000-10000mm/min is time enough to up the knife rotate to a new heading and then go down. My Tangentail setting is 35 deg and +400, so when running with the z down at +200 the tangential setting will retract to -200 if >35 deg moves.
My A Axis steps/per are the same as yours 5.55555555555 etc. I have got some gears and timing belt to make it a 10 steps/per but have not found the time to set it up.
So the key here is to take a look at your feedrates and set your z codes large enough so that it creates some dwell time for the z to get up, the A to rotate and get down all before the machine starts to feed again.
There is an issue with Mach 3 in tangential also. The tangentail moves only work well on G1 moves. So if you have any G0 moves in your code change these to G0. I have found that the A will rotate when the Z is down on the job when a G0 is present.
Iam praying for the Mach guys to work this bug out in some future updates.
I have set my A axis to high vel and acc setting as you have however due to the little bug with rapid moves it has been no point to run it so fast
If you need an other help, I can check my machine settings and get back to you.
Iam using Mach on a tangential knife table.
My Z axis is pneumatic so in the config I have selected 2.5D. As there is a time delay for the ouput to activate a relay then to work a actuator what I have done iin my gcode set my z+ to 200 and retract to -200. The way 2.5 D works is that any Z value in the minius ie -1 the output is activated. The +200 down to -200 up when using feedrates of 5000-10000mm/min is time enough to up the knife rotate to a new heading and then go down. My Tangentail setting is 35 deg and +400, so when running with the z down at +200 the tangential setting will retract to -200 if >35 deg moves.
My A Axis steps/per are the same as yours 5.55555555555 etc. I have got some gears and timing belt to make it a 10 steps/per but have not found the time to set it up.
So the key here is to take a look at your feedrates and set your z codes large enough so that it creates some dwell time for the z to get up, the A to rotate and get down all before the machine starts to feed again.
There is an issue with Mach 3 in tangential also. The tangentail moves only work well on G1 moves. So if you have any G0 moves in your code change these to G0. I have found that the A will rotate when the Z is down on the job when a G0 is present.
Iam praying for the Mach guys to work this bug out in some future updates.
I have set my A axis to high vel and acc setting as you have however due to the little bug with rapid moves it has been no point to run it so fast
If you need an other help, I can check my machine settings and get back to you.