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Messages - Agwelder

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General Mach Discussion / Re: Large circle problem
« on: November 02, 2007, 07:12:30 PM »
Yes, we are cutting an existing part.  It is used to locate multiple components, one of which is mounted in the center via a 1" hole.  We used this hole to center the part in our mill setup and the only time the part was moved, it was rotated at this point.  There was no more than a .001" of play at the center. The finished part was measured 180 deg apart on the x-axis. There was only .0006" error at these points. At the points on the y-axis the error was nearly .030".  There was no re-zeroing and the part was never removed from the mill.  To measure the part we use an edge finder and jog the table in .0001" increments.

General Mach Discussion / Large circle problem
« on: November 01, 2007, 01:02:26 PM »

We are having a problem cutting a circle with approximately 12" radius.  The item is a circular tool that needs to be reduced in diameter for better fit.  Our table has a y-axis travel limit of 15", so we are cutting a little more than half of the part at a time, then rotating 180deg and running the toolpath again. 

The toolpath begins at the proper radius (12.24"), but as reaches the midpoint (X0) the radius is reduced to 12.2137", as it reaches the end of the toolpath the radius is back to 12.24".  We have tried this with backlash comp. on and off, CV on and off, and even ran a sim on other computers.  The mechanical counters on our machine confirm our DRO's so we don't believe we are completely crazy. (yet)

N100 G20
N102 G0 G17 G40 G49 G80 G90
N104 T239 M6
N106 G0 G90 X12.234 Y-.3823 S1069 M3
N108 H239 Z2.
N110 Z.35
N112 G1 Z-.005 F6.42
N114 G3 X-12.234 Y.3823 R12.24 F10.
N116 Y-.3825 R12.24
N118 G1 Z.095 F6.42
N120 G0 Z2.
N122 M5
N124 G0 X0. Y0.
N128 M30

Thanks in advance for any help.

General Mach Discussion / Re: Backlash Compensation
« on: October 31, 2007, 08:16:56 PM »
Thanks Chip, 

We set up our Backlash comp. today.  In our test circle cutting we measured .0035 out of round with compensation off, and .0005 out with it on.  This really helped us out.

General Mach Discussion / Backlash Compensation
« on: October 30, 2007, 10:30:09 PM »
We have  two Series II Bridgeports, both with measured backlash of about .002" in the Y-axis.  Is there a way to compensate in Mach 3 for backlash?

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