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Messages - jmchris

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1
General Mach Discussion / Re: G2 - G3 Command Bug with G68
« on: October 23, 2010, 08:51:28 AM »
BR549 - Firstly, thanks for the help.  I had hoped someone from Mach3 would be on the form to look into the bug.

The code you pasted in doesn't work properly.  Instead of alternating a correct and incorrect circle, now it only makes incorrect circles.  You can add a line G1 X1 Y1 to create a one inch reference point for the proper size of the circle.  In your example the radius should be .5 inches, but when adding the reference point of 1 inch you can see the circle is really over two inches instead of 1/2.

Jeff

2
General Mach Discussion / Re: G2 - G3 Command Bug with G68
« on: October 23, 2010, 08:22:05 AM »
Sooo.  How do I G68 rotate my part?

Jeff

3
General Mach Discussion / G2 - G3 Command Bug with G68
« on: October 22, 2010, 12:06:18 PM »
All,
I seem to have sumbled on a bug that has some very odd behavior.  While the following code is exactly the same line for line two different circles are created.  My IJ is set to incremental.  I'm attempting to cut a spiral hole so I don't burn up my endmill drilling straight down in .25 stainless.  I need the G68 as I'm milling a single part and will be reversing it for every other part cut so as to use my stainless in the most efficient manner possible.  I've removed all other part G-code to ensure it wasn't causing an issue.  The two pieces that appear to conflict are the G68 and G2/G3.

First my original code that revealed the issue.  You'll notice that the only difference between line 4 and 5 is deeper Z.  But instead a different and much larger hole is created:
G68 A0 B2 R180
G0 x0 y0 z0
G1 X.280 Y.432 F.6
G2 x.280 y.432 Z-.15 i.036
G2 x.280 y.432 Z-.25 i.036
G2 x.280 y.432 Z-.35 i.036
G40
M30

Second a block of IDENTICAL lines of code that create two different size holes.  Each identical line of G2 code creates an alternating different size hole.
G68 A0 B2 R180
G0 x0 y0 z0
G1 X.280 Y.432 F.6
G2 x.280 y.432 Z-.15 i.036
G2 x.280 y.432 Z-.15 i.036
G2 x.280 y.432 Z-.15 i.036
G2 x.280 y.432 Z-.15 i.036
G40
M30

Any assistance would be greatly appreciated.
Thank you,
Jeff





4
General Mach Discussion / Re: Parrallel Port Help Request
« on: May 18, 2010, 05:09:19 PM »
I tried my wife's desktop computer today.  It just plain doesn't work...  The steppers just humm and don't move.  The best I've been able to get is only slight jerky movement between the humming.  Clearly the pulses being sent are likely too fast for the motors to react.

I've poored over the documentation and I'm unable to find anything even on basic setup configurations.  Something as basic as what Parrallel port config is best from the BIOS.  ECP EPP, etc.??  I had no idea that building the machine was actually the easiest part.  Seems something as simply as pulse, power and direction would be...  Well simple???

Thanks again for any assistance.
Jeff

5
General Mach Discussion / Re: Parrallel Port Help Request
« on: May 18, 2010, 12:33:26 PM »
Thanks for the information provided.  Through additional t-shooting I've found that the X axis motor is having some issues and not related to the driver, port or mach 3.  That said, I'm still having the speed issue. 

Is there a recommended computer that works best?  Used IBM and Dell computers are a dime a dozen so I'd be happy to pickup a computer to dedicate to the table if I knew of a model that works well.

Thanks again!
Jeff

6
General Mach Discussion / Re: Parrallel Port Help Request
« on: May 17, 2010, 08:14:10 AM »
Ok, I've gone back to the notebook and found that the X axis now does the same thing.  I've also moved the wiring for the X and Y axis and the same motor has the jerking movement.  At this point I'm pretty sure the motor is bad.

My only remaining issue is how to get the motors tuned to move either faster or slower than the 10 inch per minute.  I'll be using my table with a plasma cutter so controlling the speed is critical for various thickness metal.

I've experimented with different step and dir settings in the motor setup.  I've not noticed any difference in speed or how smooth the axis moves.

Thanks in advance,
Jeff

7
General Mach Discussion / Parrallel Port Help Request
« on: May 16, 2010, 07:24:42 PM »
I just completed a 2'X6' CNC table and am having a parrallel port issue (I believe).  I initially installed Mach3 to an IBM T40 (1.4ghz) notebook and was fairly easy to get all three axis working ok.  A little problem though.  I could only get 30 RPM (3 Inch Per Minute w/ 10 pitch screws) as a maximum speed.

I moved a desktop to the garrage to see if the faster computer would work better (Intel Q9400 2.66ghz - Quad core processor).  The Y and Z axis work ok, but ONLY when I set the speed at 10 inch per minute and the X axis just hums and jerks back and forth no matter what I do (core speed set to 100).  Through trial and error I've found that the X axis output (likely LPT?) is out of sync with the rest of the outputs.  The computer had everything build onto the system board accept the parallel port.  I had purchased an add on card with the computer ($19 card off the shelf that works fine with my old laser priner). 

A secondary issue I'm having is the two axis that do work only work at the 10 inch per minute speed.  If I adjust the speed up or down the motion becomes VERY jerky or won't operate at all (just humms and jerks back and forth).

Is there a recommended add on parrallel port that is known to work good? (or a used brand / model of computer that is known to work) 

OR - Is there a way to get more than 30 RPM from the T40? (best solution).  The LPT check program that comes with Mach3 says the 25k core speed is the only speed it will work at.

Any assistance is much appreciated!

Thank you,
Jeff

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