Posting with unwanted G93 Inverse Time Feed

[tabletpcdana]

The post for our mill-turn Mori MT1500 (based off MPLMASTER) outputs G93 in unexpected places, for example during an op where the only rotary moves are C-axis positioning. It seems to only happen once the C-axis moves past C270. Here's a code example (from a simple mill op that is transformed with a tool plane rotate around the C-axis). I'm happy with the moves at C269 & C270, but at C271 or higher a G93 is used instead of G98:

 

G00 C269.

G98 G01 X4. F6.

Z-1.

G00 X5.

Z0.

G00 C270.

G98 G01 X4. F6.

Z-1.

G00 X5.

Z0.

G00 C271.

G93 G01 X4. F.417

Z-1. F.42

 

Here's some switches I've tried changing in my post to fix the issue:

 

#C axis and Index switches

use_frinv : 1 #Use Inverse Time Feedrates in 5 Axis, (0 = no, 1 = yes)

 

I set 'use_frinv' to 0, but this had no effect.

 

 

#C axis and Index switches

rot_feed : 1 #Use calculated rotary feed values

#0 = no, 1 = yes - code coords, 2 = yes - virtual coords for fiveax_comp : 0

 

I set 'rot_feed' to 0, the problem goes away, but I think this will break rotary milling toolpaths.

 

 

#C axis and Index switches

ctol : 270 #Tolerance in deg. of inc. move before 'rev' flag changes

 

I set 'ctol' to 360, the problem goes away. However, will this break something else?

 

 

Anyone have feedback on the changes I tried or any other ideas?

 

Thanks,

 

Dana

[crazy^millman]

Dana, you have to try some of these things and see the results they will Yield. Sometimes it is just a simple tweak to get what you need and other times it is full blown dig a trench and see where the parts lay.

 

Do some tests and see what happens. Set the X axis above and run some trial cuts and see how the machine reacts. I have see two Integrex's maxhine same make model and control do 2 different things with the same code. It took some tweaking at the machine with parameters to get them to act the same. People want a bullet proof post and most times the only bullet proof post is one that has been tried trued and tested especially on these complex machines.

 

HTH

[tabletpcdana]

Thanks for taking the time to reply MillMan!

 

Follow-up question: Anyone know what kind of damage my changing the "ctol" post switch to 360 could do? Love to prevent getting bitten in the a@@ sometime down the road.

[crazy^millman]

I am not sure I have never had a need to even mess with it. Send the question to your dealer they should be able to help out.