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Stange/annoying behavior with Facing

rhdfmail
Advocate

Stange/annoying behavior with Facing

rhdfmail
Advocate
Advocate

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 ...



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mattdlr89
Advisor
Advisor

I agree with this. While lots of other operations in Fusion allow for a finishing feedrate it doesn't work with Facing. I have ended up doing two operations for my facing on many occasions. One to rough down to 0.2mm off height and a final one to take it to the required height and at a different feedrate. 

 

It would be nice to combine this into a single operation. 

 

 

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rhdfmail
Advocate
Advocate

I also normaly use 2 separate ops on steel-parts and thats often there I use chipthinning.
But thats mainly because we use 2 different cutters for roughing/finishing

The facing-op HAS finishing-feed but the quirk is that its impossible to use in certain cases, like with chipthinning activated.

One idea, for the developers, would be adding a field for percentage of cutting-feed for lead in/out.
So if you type in 90% there the lead-in feed populates with 900 with a cutting-feed at 1000. and of course the opposite. (type in 950 in the feedrate-field and the percentage gets calculated)

When the feed changes, like when the toolpath switches to finishing the lead-in gets adjusted by the same amount as for the roughing-cuts

The fact that chipthinning uses both roughing and finishing-feed in the same pass must be a bug

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