topic Re: Grooving toolpath errors when back to front selected in the tool tab in HSM Support Forum

Grooving toolpath errors when back to front selected in the tool tab

corryl — Mon, 21 Sep 2020 02:27:39 GMT

It does a sideways movement at the bottom even though full retract is selected in the passes tab

Currently running inventor cam 7.3.1.20023, and autodesk desktop app does not show any updates.

Re: Grooving toolpath errors when back to front selected in the tool tab

akash.kamoolkar — Mon, 21 Sep 2020 14:43:03 GMT

@corryl Can you attach your file here so I can take a look?

Regards,

Akash Kamoolkar

Re: Grooving toolpath errors when back to front selected in the tool tab

corryl — Sat, 26 Sep 2020 17:41:14 GMT

I made a representative part....Interestingly, it wasn't as easy to reproduce as I thought it would be. Its not happening as badly in the representative part, but it is doing about the same thing, I think. Still generating a crash that simulate detects and sideways movement at depth. In my actual part, it moves sideways a lot more. I think this demonstrates the issue though

I worked around it by making 2 grooving toolpaths, each held to a single groove.

Basically what I was trying to do here was get good surface finish and accuracy of the final part in one setup. The holes drilled creating interrupted cuts, seemed to bounce my parting tool all around. So, to get around this, I wanted to use my more rigid grooving tool, groove past the interruptions before they exist, then create those holes, and then finish up the "parting" again using the grooving tool for its rigidity. However, just in case the grooving tool could wander, I wanted to open up a groove behind the edge of the part, then only pull off a small amount of material up against the part, thus the back to front cycle. This actually works incredibly well. My parts come out within about 5um of perfect. I'll take that 🙂

Re: Grooving toolpath errors when back to front selected in the tool tab

Anonymous — Mon, 28 Sep 2020 16:48:43 GMT

Hi @corryl , I am a HSMWorks user so I cant open your file, but it sounds like the same issue I run into. I notice this when the next plunging roughing pass is less than your maximum grooving stepover number. Try reducing your roughing step over number.

Jason

Re: Grooving toolpath errors when back to front selected in the tool tab

corryl — Wed, 30 Sep 2020 03:50:59 GMT

Interesting, I actually hadn't noticed the setting, and that setting will prevent it from generating a collision. However, I wasn't looking for another workaround (even if yours is easier than mine 🙂 ), so it won't be marked as a solution. I'm only on here because I believe this to be a bug. At first read, I did think perhaps it was a solution and I was an idiot, and had it been called minimum grooving stepover, that would certainly have been the case. Since it says maximum, though, and you say to lower it, means the software is free to choose a lower value, so I still stand by this being a bug. Even if it were minimum, I'd *STILL* call it a bug because it generated a toolpath that collides rather than generating an empty toolpath with a log message about the stepover. So I plan to leave this open until either I am proven to be an idiot 🙂 or they accept it as a bug and get it on the backlog 🙂

Re: Grooving toolpath errors when back to front selected in the tool tab

corryl — Wed, 30 Sep 2020 04:20:33 GMT

Ok, this is worse than I thought. I now have a situation where the above workaround fails, my workaround fails, and in one case, it decided to run the grooving tool, full depth, through the front of the part back to z0. Its actually somewhat comical...I may see if I can make another representative part...

Re: Grooving toolpath errors when back to front selected in the tool tab

corryl — Wed, 30 Sep 2020 04:54:35 GMT

Ok, grooving is all kinds of messed up. I managed to find that the "backoff" in this new part was the issue in sideways movement. However, not, I can't get it to just groove a bearing spacer. I thought maybe it was because it was interrupted by a keyway, so I filled it in. Granted, its 0.5mmx0.5mm, just to keep off of the outer race of the bearing. Nope, empty toolpath, stepover, direction, down only, nothing. It can't just simply run the tool down as if in a facing pass....

You guys really need to work on this. Its a pretty basic operation and I seem to be able to break it constantly now. I guess I'm going to have to do these toolpaths by hand. I was already going to have to add the broaching anyhow, so its not the end of the world on this part....Please spend some time on this.

Re: Grooving toolpath errors when back to front selected in the tool tab

akash.kamoolkar — Thu, 01 Oct 2020 12:05:23 GMT

@corryl I turned off "roughing clearing pass" and it didn't create the sideways move at the bottom.

Regards,

Akash Kamoolkar