3cm to 2cm thickness of material

[Tricon]

I am needing to remove .5" surface from the back of a stone slab 4" x 63.75". I am trying to remove 1/8" by 1" sections at a time to prevent overloading the 2m2kw spindle. The tool is 3.622" in diameter and the CNC seems to skip a steps in the 1" removal. The CNC makes two passes and then tries to cut a full 3.622 x 1/8" cut on the third cut. I have programmed 4 passes 1" apart but the CNC is removing almost 1.811" which is half of the diameter. I have attached a screen shot of the set up. What am I missing?

[Bob La Londe]

Chang cut width to .26 / .27 for 1" step over.  If using a profile set you profile 2.7 inches past stock and set cut worth to 2.7 plus stuck plus cutter width.  If using pocket with horizontal or vertical set roughing clearance to -2.7

[dh42]

Hello

I see StepOver = 0 on your picture, a mop can't work properly with stepover = 0

If you want 1" between passes, you must set the stepover to 0.276 (equal to 27.6% of the tool diameter = 1")

Cut width is the total amount to cut in width (4")

from the manual

StepOver    

The cut is increased by this amount each step, expressed as a fraction (0-1) of the cutter diameter.

Cut Width    

The total width of the cut. If this width is greater than the tool diameter, multiple parallel cuts are used.

Chang cut width to .26 / .27 for 1" step over.

not Cut width but step over

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David

[Tricon]

I think this is what you were suggesting. This makes 4 moves around the piece without cutting adding 80 minutes or more to the program. How can I cut out that wasted move?

[Tricon]

Chang cut width to .26 / .27 for 1" step over.  If using a profile set you profile 2.7 inches past stock and set cut worth to 2.7 plus stuck plus cutter width.  If using pocket with horizontal or vertical set roughing clearance to -2.7

How do I set the profile 2.7 inches past stock? So 4" + 3.622" + 2.7" = 10.322" that makes a lot of wasted machine moves off the part which is a huge waste of time at only 7 inches per minute (the recommended feed speed for the RPM and cutter diameter.

[Bob La Londe]

It is a total of 2 passes over max, and assures cleanup.  Just put the profile the desired distance pat th stock. That's it.  Nothing difficult or complicated.

[dh42]

Hello

Another way to do.

I attach a file that use an Engrave mop + 4 polylines to define the paths. Note that when you create an engrave mop with multiple polylines, like here, to be machined in the right order, the polylines must be selected in the right order by ctrl + left clic when they are assigned to the Engrave mop, AND the Optimization mode must be set to None.

I simulate the job with CutViewer with 7 IPM (I don't know the rapids speed) and I get a total = 2H27' (4 passes per level, 4 levels about 0.125")

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David

[Tricon]

Thanks the pocket program ran at over 4 hours before I shut it down. Multiple passes after the surface was already cut "clean up" that was totally wasted time. I am looking at using a profile today. I may program the option you suggested if the profile does not work out time wise. Machining stone and engineered quartz is very time consuming due to tool speeds and our lighter duty CNC machine.