Lead in/Lead out with overlap

[SLJ]

Since downloading the MR0304 patch, I've had to significantly increase overlap when running contour on an enclosed chain. Example: Closed chain contour of a pocket to finish the walls. Start in mid contour, lead in/lead out at .1 lin/.1R, overlap at .02. Now it leaves quite a hump of uncut material in the wall, had to go to .25 overlap to clean it up. It may be coincidence, but it seems like I started having this trouble about the same time I downloaded the new patch.

[Shawn Wentzel- Wenteq Inc]

Have not noticed it, maybe the tool you are using is dull?

[Bunny McRabbit]

In this cases I read a code before saying anything .

Or :

Make a code on Mc with patch and without and compare .

are they same ???

I do not think this is Mastercam issue ,may be not sharp tool or anything else ,like gouge check enter/exit motion setting

 

HTH

[robk]

Is the tool re-ground?

[SLJ]

Hadn't checked the code yet, will do. This has happened on several parts with different tools. Same lead in/out I've used for about 3 years, sometimes with a bit of helix to blend better in Z

[SLJ]

Now this is gonna bug me for a while! Checked the code(finally) and it was correct! Not sure what to make of it, 'cause as I said earlier it has been with different tools and different parts, on two different machines.

[Bunny McRabbit]

SLJ !

 

tHIN WALLS ?

[Bunny McRabbit]

If your part walls are thin ,directiong of milling and the tool quality are very important

Less RPM ,good sharp tools ,conventional milling instead of climbing and biggest possible enter exit arcs will help you .

[SLJ]

Walls in question are short and reasonably heavy. I've used the same routine for a couple of years with no problems, now it's showing what looks like the tool stopped short of the initial starting spot. On some cuts, not all. If and when I get more time, I've got to dig up all the problem areas and check code and MC settings. May find something yet.

[steve f]

Backlash in the ballscrews?

Using cutter comp?

 

If the code is correct than it would be a waste of time to look to Mcam for the solution.

 

JM2C

 

steve

[Hardmill]

SLJ can you e-mail your file to me??

 

 

PEACE

[Fig sign]

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Backlash in the ballscrews?

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I too suspect this .

It is easy to check ,btw

[SLJ]

One of the machines in question just underwent a full laser and ballbar check. Passed with flying colors. None of the machines here are more than 4 years old,(3 of the 6 main machines are newer than 2 years.) running 99% alumn., one shift only. Would agree about the code being right, so MC should be also. Too many irons in the fire, will check deeper when the workload allows.

[Tim Johnson]

We had the same problem with a new machine. It turned out that a couple parameters were wrong. (Fanuc 18I) Try using high speed mode (G05.1, G08) to see if that fixes it. It did on ours and it also told the service guy where to look for the parameters to change.