2d contour cut problems

[gibbs machine corp]

I copied a file to the ftp site in the MC9 folder called contour problems.mc9. I am trying to contour cut both of these profiles with no luck at all. I have been running Mastercam for almost 8 years now and have seen this problem only a couple of times. The profiles are saved out of an existing MC9 file and merged into an AutoCad file that I igsed in. My guess is that it's an AutoCad related problem and somehow is affecting the profiles created in and copied from a Mastercam file. If I merge the AutoCad file into the MC9 file the profiles cut fine. Does any body know what causes this?

From now on I will merge the AutoCad file into the MC9 file. I'm just curious as to what causes this. We work very closly with AutoCad and Mastercam.

[cadist]

Hey gibbs I just had a look at your file. The toolpath needed regeneration. And when I regenerated it, it shown overlapping entity.

My system tolerance are very tight. I trimmed it at overlapping area and the toolpath was just fine.

IMHO. Use tighter tolerance and analyze chain again.

[gibbs machine corp]

I did analyze the chain and found no overlapping entities. I tried offsetting the contour and the profile disappeared completly, no matter which direction (L,R) I tried to offset it.

[gibbs machine corp]

After further review, I had to redraw all the radii to get the profile to cut. The profiles cut fine before I merged in the ACAD file. Also the profile was created by taking 1 profile and mirroring about "Y" (lh to rh). This caused the arcs on the rh side of the profile to cut on the inside of the profile while all the lines were cutting on the outside of the profile.

[Roger Martin from CNC Software]

Some of the arcs where in a View #9 and some in (as you would expect) View #1

To get the toolpath in CONTOUR PROBLEMS_REVISED.MC9 I output all the geometry to an IGES file. Moved all the original geometry (certainly could have deleted it all, but kept it for comparison purposes) to Level 1 to “get it out of the way”. Read the IGES data back in the MC9 file. Then did Screen, Next Menu, Comb(ine) Views and re-chained on this new profile.

 

Some details...

The difference between View #1 and #9 was just sign of the ‘X’ of their view matrixes were opposite.

 

 

Name : SYSTEM VIEW 1 - TOP

Origin : X0. Y0. Z0.

Number : 1

Matrix

: X1. Y0. Z0.

: X0. Y1. Z0.

: X0. Y0. Z1.

--------------------------------------------------

Name : SYSTEM VIEW

Origin : X0. Y0. Z0.

Number : 9

Matrix

: X-1. Y0. Z0.

: X0. Y1. Z0.

: X0. Y0. Z1.

 

 

After reading the geometry back in from the IGES file those arcs that were in View #9 are now in View #4 (the ‘bottom’ view). Doing the Combine Views on everything brought those (30) arcs into View #1.

[Pat-TGM]

Use com views command, It may help.

Under : Screen, next menu, comb views

[gibbs machine corp]

Thanks Roger That is a lot faster than redrawing a bunch of arcs. Can't say I understand exactly what the 'views' are all about.

This forum is an awesome tool for those of us that get lost easily.