The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
. . . ah that looks interesting. Also interesting that your drawing does to same over enthusiastic finishing pass.
Not sure those settings are still in 2007 version but hopefully they are . I'll experiment in the morn. Meanwhile I've been fighting power cuts. :bang:
cnc-it:
I'm pretty sure the setting are the same in later versions I don't think FC has changed much even on the latest version..I also noticed the x position going below center line but it leads in at an angle and only touches the work piece at the center line by the looks of it...
awemawson:
John, you are entirely correct - this feature IS in the 2007 version that I have, BUT - up bright and early to test it out (well actually up bright and early to get the bins out - yes they collect on a Bank Holiday!) and the results are not at all what I expected.
Specifying a start point on the Z axis slightly away from the Z=0 point with X=0, sure enough it moves there having done the rough pass, but then continues to the X=-6.6 point that it previously was doing and carries on.Only done it in simulation, as I'm running out of good edges on my inserts !
awemawson:
OK problem solved :thumbup:
Another setting in the MISC tab is approach angle, which was set to zero. Altering it to 30 degrees gives a much more healthy state as far as the insert is concerned - no more upwards pressure tending to chip it.
So I shifted the G54 offset to -1 mm from where it was (thus skimming a further 1 mm off the part) and ran the new version with the 30 degree approach - guess what - no insert chipping :ddb:
My thanks to John for starting me looking at this area of Featurecam :thumbup:
PekkaNF:
That is very nice. Tool path looks nice with 30 degree approach angle and sounds logical.
I still don't quite grasp why does cutting edge starts wrong side of the spindle axis (rotating wrong direction in cutting direction, inserts don't stand that or rubbing). Is there a offset relative to spindle axis and why it is default? Or is the insert tip radius decade off? I don't get that.
Pekka
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