simple 2 d contour question

[cherokeechief79]

i have a contour that I am using depth cuts and multi passes on.

im using a sharp aluminum insert cutter and the depth of cut is shallow.

when it gets down towards the bottom it leaves just a thin sliver on the floor that im afraid is going to fold and not cut taking my insets out.using depth cuts along with multi passes is there a way to have it cut the depth cuts down to the final depth before advancing to the next multi pass or am I going to need to add a lot of operations to accomplish this?

[cncworker]

Yes there is.  On the depth cut tab, depth cut order, select "by depth" instead of by contour.

[cherokeechief79]

tried that. it doesn't work with multi passes.

looks like im going to have to copy this op 10 times without multi passes.

[cncworker]

Hmmm, you are correct.  I'll have to mess around with it some more.

[FTI2007]

Or offset your geometry 9 times and chain each line so you have 10 chains in one operation without multipasses . Then set depth cut order by contour.

[SlaveCam]

Or use 2D ramp with plunge instead of depth cuts.

[Thad]

In these situations, I intentionally leave a bit of a flap of steel on the bottom...something like 1/8 inch (something strong enough that it won't suck up in between the tool and the part). Then I take one pass, conventional cut, deep enough to cut the flap off in one shot. Doesn't matter if the flat is larger than the tool diameter. The conventional cut ensures that the flap gets pushed out and away as it's being cut. Maybe leave an extra .005-.010 XY stock on this pass.

 

It's not something that I would cut unattended, I always make sure I'm there when it does this final pass. I've done it hundreds of times with no issue.

[cherokeechief79]

wow, both of these methods work great!

I never would have thought of using ramp with plunge.

thank you!

 

offsetting the geometry 9 times does exactly what I want it to do but the ramp method is simple and just a few more clicks from what I have now. the only thing is that follows the same path back to the start.

[cncworker]

or.....you could get into using the Transform operation. I've used that many time.  Then just one operation with whatever stepover distance inside that.  

[cherokeechief79]

or.....you could get into using the Transform operation. I've used that many time.  Then just one operation with whatever stepover distance inside that.

yes but toolpath changes drastically with each pass.i think It would add too much "air" if I were to just transform the final pass outward 9 times

[RonC.]

tried that. it doesn't work with multi passes.

looks like im going to have to copy this op 10 times without multi passes.

yup you are correct, as of now that is what you have to do..

unless you ramp 2d contour..

 

when ramping it go from top to bottom then move in on mulit-pass

 

hth

Ron