Stange/annoying behavior with Facing
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Facing-op has some useful features for example "Chip-thinning" and "extend before retract"
Only problem is that they have som quirks depending on how you use them.
Scenario: simple facing where I want to "roll" the cutter into stock and face the whole surface with feedrate F until the whole cutter has passed the stock. To make it a bit more interesting I want to do it in multiple stepdowns with a finishing-pass with different feedrate.
Seems simple? Just set multiple depths with a finishing cut and then check the boxes for chipthinning and "extend before retract"? Nope.
First problem is that "extend before retract" only prevents the tool from retracting while half of it still is on the part.
BUT! it do that by just adding a lead-out wich often has different feedrate.
Second problem seems to be the combination of chipthinning and finishing-feedrate.
The toolpath starts with a regular lead-in, then arcs/rolls into the material with the set cutting-feedrate.
BUT! (again) it do the same on the finishing-pass. IE. it starts the cut with cuttingfeedrate and switches to finishing-feedrate at the end of the chipthinning-arc
One solution for #1 is to make sure you have the same lead-out feed as your cutting-feed, witch then becomes the same problem, but opposite, on the finishing-pass
When i tried to just add a pass-extention half my tooldiameter +1mm the chipthinning vanished.. so no solution
The only way to get good surfaces seems to do the finishing-pass as a separate operation
Annoying ...
Fusion