billb

CNC Software
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About billb

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  1. billb

    2020 Flowline ribcut issues

    We have that logged as a bug (D-36914, D-38758). As a work-around, you might be able to use the “Single row only” checkbox. Rib cuts work in that mode provided the drive surfaces form a single row, not a quilt / grid.
  2. billb

    Transition moves on dynamic toolpath

    Thanks for sharing this. I was able to duplicate the odd microlift move in a similar part. I logged this as R-22490.
  3. Thx for both parts. My part and your Rotary issue part both show the D-39692 problem with gap along one cut due to check geometry. I submitted a fix for that and hope it moves forward into an upcoming release. But my part had the Retract plane turned on. Your parts have it turned off and that shows another problem with the feed plane not getting applied. I logged this second issue as D-39371. If you enable retract plane, then your Rotary issue actual path will lift the tool between cuts. You’ll have to increase the retract increment from .25 to .5 to clear the check geometry. Enabling retract plane on Rotary issue, though, doesn’t help in your release as you will bump into D-39682. I’ll see about the start angle. You should be able to start at 270 degrees to get the desired -90 degree effect.
  4. Thanks for whittling this down to a simple case. I created a similar part and duplicated the problem in X9 thru MC2020. I logged it as D-39692. If you backplot (and especially if you enable display of endpoints) you will see that the tool machines along the cylinder right up to the block but then keeps down thru the block. So I think this is a “retract” issue (tool not lifting when it should). I didn’t find any work-around yet. Thank you for letting us know about this.
  5. Perhaps tighten settings/configuration/tolerances - the curve chordal deviation?
  6. From your selected open air chain, a closed air region is built. It looks like the region is built perpendicular to the air chain (not tangent to the machining region). This keeps the tool from cutting that last bit of material. Use the "preview chains" option to see where the tool is (not) allowed to go. I know that we have a similar issue logged against open air chain extension - I'll add this part to that defect. I suspect that if you build a closed air chain which extends tangentially from the machining region, you'll get the last bit cut.
  7. billb

    creating a "spiral" wireframe

    Interesting problem. What about using zSpiral add-in (c-hook) in a rotated view then projecting it (flatten it) in your working view? Or create a 2D HST Peel or Dynamic peel path and backplot/save path as geometry.
  8. billb

    2019 Finish Pencil Toolpath

    I'm stumped. I logged this as D-37697 "Finish/pencil fails to yield toolpath". I get a similar failure with HST-Pencil (same two drive surfaces, same tool). Maybe this has something to do with the surfaces being somewhat far from the Cartesian origin. If I translate/move the geometry +800 in X and regen, path motion is output. Here's a work-around: add a check surface to the finish/pencil operation. It can be anywhere (well away from the part). Now regen. This time, you'll get a path output. The presence of the check geometry causes a slightly different algorithm to be used, one which yields a result.
  9. billb

    Linking parameters in flow toolpath

    I logged this issue as R-19176. I did my testing in MC2020. With a "keep down" distance of 2.0mm or 1.0mm the tool doesn't retract (I agree, I think it should). With a "keep down" distance of zero, it still doesn't retract. But I was able to enter a "keep down" distance of "-1.0mm" (!) and when I regenerated, the tool did retract. Maybe that will work for you, too, as a work-around.
  10. billb

    Linking parameters in flow toolpath

    If I go to the front view and rotate (move) the cylinder 90 degrees and regen... well, then the tool retracts between cuts. Maybe the "keep down" move is being measured in the wrong view? I'll keep digging.
  11. billb

    Odd stock model behavior

    Thanks for this part. I am able to duplicate the odd shift in MC2018. It looks to be repaired in MC2019 (and beyond). I believe this got fixed under S-47439 (a general testing/refactoring/improvement story). I logged your part as D-37138 so that we can do some more testing with it. It is a good test part. I was able to create a similar comparison "shifted" Stock Compare in X9. I don't, immediately, see any work-around for MC2018.
  12. billb

    Mastercam 2019 Flow line toolpath 1 st pass gauge

    Looks like the cutter compensation goes perfectly sideways along the very bottom edge of the fillet surface. The tool pushes out rather than down and out (which it does for other contact points on the surface). That is how the flowline raw pass is constructed (before gouge-check or any check surface trimming). I'll get this logged; perhaps there is something we can do to influence the raw pass based on nearby (local) curvature of the part (bump it down a little bit). As a work-around, I was able to use "Split" to split off a very little bit of the bottom edge. (Split splits the surface into two; I reselected just the top big portion). Another work-around might be finish/contour (or rough/pocket with rough passes turned off).
  13. billb

    2019 Flowline Lillipop Alarm

    For lollipop, it looks like the shoulder diameter is limited to the cutting diameter for all 3 shank shapes (straight, tapered, reduced neck). I guess that makes sense - once the shoulder diameter equals the cutting diameter, you no longer have a lollipop mill - you have a ball endmill. For tapered and reduced shapes, you can set the shank diameter to something wider than the cutting diameter. For the straight option, both the shank diameter and shoulder diameter are limited to the cutting diameter. To work around that rule, I was able to set up a tapered shape but use a big value (89 degrees) for the taper angle and set a really short shoulder length.
  14. billb

    2019 Flowline Lillipop Alarm

    Yes, non-cutting geometry. That message appears when you use a "reduced neck shank" on a lollipop mill in a toolpath that supports undercutting (finish/contour, rgh/pocket, ...). The undercut detection code doesn't support that neck shape. It will allow the tool to undercut but, perhaps, not undercut as far as it really can. You won't get this message with a "tapered shank" or "straight shank". I'll see what I can do to clarify that warning message. (Thanks!)

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