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Author Topic: G73?????  (Read 7910 times)

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Offline lokey

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G73?????
« on: March 30, 2009, 09:12:25 AM »
Hi, What does  G73 do? On the mill options tab on the ports and pins configuration page there is a general option selection for G73 and pull back for when no switches used.  Mach 3 will not let me apply this option.  Is there away to set option? Thanks in advance for any feedback received.
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Offline Graham Waterworth

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Re: G73?????
« Reply #1 on: March 30, 2009, 01:44:57 PM »
G73 is a peck drilling cycle, the pull back is the amount the tool jumps up to break the cuttings.

Graham
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Offline lokey

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Re: G73?????
« Reply #2 on: March 30, 2009, 03:22:25 PM »
Hi Graham, Thanks for the feedback. I am using a Zenbot with Mach3. I am trying to cut a rotor for a wind turbine. The image file is attached.  Every time a circle is cut the the center point shifts positive by  0.001 of a inch on the machine but is not shown in the position DRO. When the last circle is cut the center point of the project  is off by about 1/8 of an inch. I need to write a macro that will solve this problem.  I am new to Mach3.  I watched the videos on  VB script.  If anyone has any ideas or can point me in the right direction please let me know. Best Regards
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Offline Graham Waterworth

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Re: G73?????
« Reply #3 on: March 30, 2009, 07:18:39 PM »
If the position is changing then you are loosing steps, you need to fix this by retuning the motors or slowing the rapids or reducing the cut size,  a macro will not fix this.

Graham
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vmax549

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Re: G73?????
« Reply #4 on: March 30, 2009, 10:45:43 PM »
OR possibly the steps per unit setting is not correct????


Just a thought (;-) TP
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Offline lokey

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Re: G73?????
« Reply #5 on: March 31, 2009, 12:24:23 AM »
Hi, I tried the suggestions and the machine still has the same problems. I tried the axis calibration and the circles where cut as ovals.  The problem remains the same, after a circle is cut, the next circle that is cut is not centered on the last.  There is a shift positive of 0.001. The affect accumulates and the last circle cut is off by about a 1/8 th of an inch. The same problem occurs in other projects with many chains contained within many layers. Thanks again for the feedback and if anyone has a idea how to solve this problem please let me know. Best Regards   
« Last Edit: March 31, 2009, 12:48:59 AM by lokey »
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vmax549

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Re: G73?????
« Reply #6 on: March 31, 2009, 02:46:09 AM »
DOes MAch show the correct position values??  and the machine NOT cut where it is suppose to?  IS your code correct. Has it always done this or just started? 

(;-) TP

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Offline lokey

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Re: G73?????
« Reply #7 on: March 31, 2009, 08:14:38 AM »
Hi, after each chain cut of a circle the DRO shows the correct value but the machine shifts to the positive.
A simple G code test of 
G1 X 0.5
G1 X 0
The DRO reads 0
The Dial Test Indicator reads 0.003 and if I run the code more than once the problem adds up and the machine shifts to the positive and the DRO reads still reads 0. This is causing each circle to be off center a little more after the last. The last circle in the project is of center by about a 1/8 th of and inch.
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vmax549

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Re: G73?????
« Reply #8 on: March 31, 2009, 09:58:07 AM »
IF you have confirmed that the steps per unit are CORRECT(measured) then it is either missed steps ( too fast accel rate) or gained steps( noise) or something loose on the machine. Couplers or pulleys not rigidly mounted tightly to screws and slip under load.

(;-) TP

« Last Edit: March 31, 2009, 10:00:02 AM by vmax549 »
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Offline Chip

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Re: G73?????
« Reply #9 on: March 31, 2009, 04:23:32 PM »
Hi, Lokey

Post your xml file if you can.

Some axis driver boards are sensitive to LowActive settings in ports & pins, Motor Outputs.

Are all your Low Actives set the same for X, Y & Z, "They should Be". If an axis runs backwards use "Reversed" in  Home & Limits page to reverse It.

This can cause lost Step's.

Chip
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