Hello Guest it is November 15, 2019, 01:27:00 PM

Author Topic: Tool pauses at X axis while cutting circles or threading?  (Read 8888 times)

0 Members and 1 Guest are viewing this topic.

Tool pauses at X axis while cutting circles or threading?
« on: May 23, 2009, 11:52:27 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. ???

I'm using the NFS wizards to create the toolpaths (2.83 I think) and version 3.042 of Mach 3.

Offline Chaoticone

*
  • *
  •  5,628 5,628
  • Precision Chaos
    • View Profile
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #1 on: May 23, 2009, 12:04:54 PM »
Have you checked your backlash for the X and Y?

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #2 on: May 23, 2009, 12:25:33 PM »
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.

Offline ger21

*
  • *
  •  6,288 6,288
    • View Profile
    • The CNC Woodworker
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #3 on: May 23, 2009, 12:33:16 PM »
CV mode?
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #5 on: May 23, 2009, 03:13:21 PM »
Show your code.
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #6 on: May 23, 2009, 05:29:33 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
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #7 on: May 23, 2009, 09:18:12 PM »
See if some of the settings in this file help.

Offline ger21

*
  • *
  •  6,288 6,288
    • View Profile
    • The CNC Woodworker
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #8 on: May 24, 2009, 07:28:12 AM »
Do you have backlash compensation turned on?
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

vmax549

*
Re: Tool pauses at X axis while cutting circles or threading?
« Reply #9 on: May 24, 2009, 09:43:03 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