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| | |-+  Tool pauses at X axis while cutting circles or threading?
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Author Topic: Tool pauses at X axis while cutting circles or threading?  (Read 2906 times)
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radioactive
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« on: May 23, 2009, 10:52:27 AM »
While cutting a circle (0.86" diameter, 1" deep, spiraling downward toolpath) the tool moves along great except it pauses very briefly each time it crosses the X axis.  Why does it do this?  It does the same thing when I am cutting external threads on the same part. Huh

I'm using the NFS wizards to create the toolpaths (2.83 I think) and version 3.042 of Mach 3.
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Chaoticone
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« Reply #1 on: May 23, 2009, 11:04:54 AM »
Have you checked your backlash for the X and Y?

Brett
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radioactive
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« Reply #2 on: May 23, 2009, 11:25:33 AM »
No, I haven't done that yet.  I'll try to get that done this afternoon.

I don't think that is the issue because I seem to recall cutting a different part a few weeks ago where it didn't pause like this.
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ger21
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« Reply #3 on: May 23, 2009, 11:33:16 AM »
CV mode?
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Gerry

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SteinarN
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« Reply #4 on: May 23, 2009, 12:19:42 PM »
Quote from: ger21 on May 23, 2009, 11:33:16 AM
CV mode?

Me think also.
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MachineMaster
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« Reply #5 on: May 23, 2009, 02:13:21 PM »
Show your code.
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radioactive
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« Reply #6 on: May 23, 2009, 04:29:33 PM »
It appears as though I have 0.002" of backlash on the Y axis.  X and Z were about 0.0004 and 0.0001. 

Here's a tidbit from the code for the finish pass of the circle that pauses at the X axis each time.

(***** Circular Groove/Cutout *****)
M6 T3
M03 S4000
M9
G00G43 H3 Z0.1
G00 X0.805 Y0.1875
G41 P0.125
G01 X0.6175 F25
G03 X0.43 Y0 R0.1875
F25
G02 X-0.43 Y0 R0.43 Z-0.025
X0.43 Y0 R0.43 Z-0.05
X-0.43 Y0 R0.43 Z-0.075
X0.43 Y0 R0.43 Z-0.1
X-0.43 Y0 R0.43 Z-0.125
X0.43 Y0 R0.43 Z-0.15
X-0.43 Y0 R0.43 Z-0.175
X0.43 Y0 R0.43 Z-0.2
X-0.43 Y0 R0.43 Z-0.225
X0.43 Y0 R0.43 Z-0.25
X-0.43 Y0 R0.43 Z-0.275
X0.43 Y0 R0.43 Z-0.3
X-0.43 Y0 R0.43 Z-0.325
X0.43 Y0 R0.43 Z-0.35
X-0.43 Y0 R0.43 Z-0.375
X0.43 Y0 R0.43 Z-0.4
X-0.43 Y0 R0.43 Z-0.425
X0.43 Y0 R0.43 Z-0.45
X-0.43 Y0 R0.43 Z-0.475
X0.43 Y0 R0.43 Z-0.5
X-0.43 Y0 R0.43 Z-0.525
X0.43 Y0 R0.43 Z-0.55
X-0.43 Y0 R0.43 Z-0.575
X0.43 Y0 R0.43 Z-0.6
X-0.43 Y0 R0.43 Z-0.625
X0.43 Y0 R0.43 Z-0.65
X-0.43 Y0 R0.43 Z-0.6625
X0.43 Y0 R0.43 Z-0.675
X-0.43 Y0 R0.43
X0.43 Y0 R0.43
G00 Z0.1
G03 X0.6175 Y-0.1875 R0.1875
G40
G00 X0.805 Y-0.1875
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MachineMaster
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« Reply #7 on: May 23, 2009, 08:18:12 PM »
See if some of the settings in this file help.
* Mach3-CVSettings-v2.pdf (37.06 KB - downloaded 127 times.)
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ger21
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« Reply #8 on: May 24, 2009, 06:28:12 AM »
Do you have backlash compensation turned on?
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Gerry

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vmax549
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« Reply #9 on: May 24, 2009, 08:43:03 AM »
ALso make sure you are running in CV mode(G64) not exact stop mode(G61).  The wizard tends to assume you are in the correct modes(;-)

Just a thought, (;-) TP
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