Sorry to say that didn't help either. Tried going up to .1580 dia. and down to .1560 dia. Still have the slight error in arc calculations. Adding a tenth to the arc fixes the error, so I know it's a rounding problem. Any other thoughts?

Ok, I'll try that. We are using a 4mm endmill. Although, I believe we've had this same problem with Inch tooling as well. Thanks.

NC precision already set to .0001 What are the rounding rules in general? I assume .04335 is rounded up to .0434 where .04334 is rounded down to .0433. I need to a force round up for all cases. Is this even possible? Or do I need to edit the code each time to add .0001? Thanks, Jeff

I tried IJK output, same overflow error. Control prefers R output. I assume it's some type of rounding error. The arc should round down to .0433, but this makes the arc is too short. If I add .0001 to the arc value, error goes away until it encounters another. There are multiple situtations in the post where this occurs. Truncating the arc value won't work, I need to round up for all values. Arc needs to be > than 1/2 of point to point move. Thanks for your thoughts. Jeff

Need some help with a post. I am getting small differences in calculated arcs that are erroring out at the machine. For example the following moves should have the same arc: N436 G3 X1.5036 Y-1.7636 R.0434 (from X1.4284 Y-1.8067) N438 X1.4284 Y-1.8067 R.0433 The .0001 difference gives an overflow error. Actual arc is .043338 so .0434 is fine but not the .0433 arc. I am not sure if I should be changing a tolerance setting in the post processor or if the problem is in the MasterCam toolpath. Using MasterCam X3, generic mpfan.pst, Tiger IV controller. Thanks in advance for any insight. Jeff

Cadcam, I sent you an email. Thanks for the help. I just moved Mastercam to XP, works great, had to upgrade the HASP driver. By the way, what were the fixes/patches for the 7.2c update?

cnc-guy, Email sent. Thanks.

Central Illinois. In between flood plains, well sort of.

Anyone know where I can get a 7.2c upgrade disk? I know, I know, I should have taken advantage of the legacy offer earlier this year. Thaks, Jeff

Thanks for the help. I'm assuming I would use a null modem cable also. The documentation I have shows odd pin connections. And finally, we have a mazatrol offline programmer/simulator can we use the same settings to get the two controllers to "talk" to each other? Again thanks for your speedy responses. This forum stuff is great.

Hope I'm not to late to the party! We have a Mazatrol Cam T3 controller and are having problems communicating to it as well. Can I use the same parameter settings that you listed here or would they be different? I think the max baud rate is 4800. We just want simple offline program storage. Can I use a simple terminal program or do I need a dnc? Thanks for your help. Jeff