Holes not round

[jeff]

I'm not sure if it's my MpMaster post or my machine as I've never seen this before...

On my Kia mill, Fanuc 0M.

When ramping a hole on this machine, it will be round ONLY if the total Z depth is equally divisible by the ramp depth ie: 2" deep with .400 ramp depths.

If it's .400 ramp and 1.7 total depth, the hole is way out of round, depending on hole size it's as much as .005 out of round.

 

Anyone ever have this happen before?

 

EDIT:

I just compared the code to my Okuma post and it's identical, so it has to be my machine.

[Guest]

Are you using IJK or R output?

[jeff]

IJK

[jeff]

Here is some of the code with .400 ramp, 2" deep:

Z.25
G01Z0.F500.
G41D5X1.3113Y-1.9293F45.84
G03X1.1406Y-2.I-.0707J-.0707
X1.1406Y-2.Z-.4I.6094J0.
X1.1406Y-2.Z-.8I.6094J0.
X1.1406Y-2.Z-1.2I.6094J0.
X1.1406Y-2.Z-1.6I.6094J0.
X1.1406Y-2.Z-2.I.6094J0.
X1.1406Y-2.I.6094J0.
X1.1407Y-2.01I.6094J0.
X1.3125Y-2.0779I.1J.0016
G01G40X1.3821Y-2.006
G00Z.25

And here it is .400 ramp 1.7" deep:

Z.25
G01Z0.F500.
G41D5X1.3113Y-1.9293F45.84
G03X1.1406Y-2.I-.0707J-.0707
X1.1406Y-2.Z-.4I.6094J0.
X1.1406Y-2.Z-.8I.6094J0.
X1.1406Y-2.Z-1.2I.6094J0.
X1.1406Y-2.Z-1.6I.6094J0.
X1.75Y-2.6094Z-1.7I.6094J0.
X1.1406Y-2.I0.J.6094
X1.76Y-2.6093I.6094J0.
X1.8279Y-2.4375I-.0016J.1
G01G40X1.756Y-2.3679
G00Z.25

[Machineguy]

Try breaking your circle into 2 sections at 180 deg apart, repost and run again. The kia may have a issue with full circle cuts.

[jeff]

Try breaking your circle into 2 sections at 180 deg apart, repost and run again. The kia may have a issue with full circle cuts.

Isn't there a place in the MpMaster to do this? I've looked and can't seem to find it.

 

edit

nvm it's in the contorl def duh

[Reko]

It's in your Control Definition under Arcs... I set mine to Break at Quadrants

[jeff]

I just noticed the "Round End Point" checkboxes.. could this have any impact also?

Mine is set to break on arc failure, I think that's default

[Reko]

No, I think that just rounds to the nearest least input increment... mine is set to that as well... no problems here.

[gcode]

are you using contour/ramp or circle mill/helix?

 

if you are using contour/ramp, make sure you have "make pass at final depth" checked

[gcode]

I think this is issue with your machine

If you backplot the code..  the even code makes all passes starting at 9 oclock (-x)

 

the uneven code makes all the ramp passes at 9 then makes the final floor pass starting a 6 oclock (-y)

 

try changing the start anlge of the uneven pass so it makes it's finish pass starting at 9 oclock

if the hole is better, you've got machine issues

[jeff]

are you using contour/ramp or circle mill/helix?

 

if you are using contour/ramp, make sure you have "make pass at final depth" checked

Yep Contour Ramp in this instance, I always have pass at final depth checked.  

[Machineguy]

Change your lead in, lead out. Uncheck the enter/exit at midpoint in closed contours.

[jeff]

Change your lead in, lead out. Uncheck the enter/exit at midpoint in closed contours.

I will do that as a last resort, I will be running a test piece here shortly to try the break at quadrants change that I made.

[mkd]

wouldn't happen on a Haas.

[Machineguy]

Hey,

Haas just finished the PM on our lathe.

Tomorrow the mill gets done. 

[jeff]

wouldn't happen on a Haas.

I can do a lot of stuff that wouldn't happen on a Haas.  

[jeff]

Breaking into quadrants seemed to fix the problem.

Thanks everyone for the help!