Possible issue with Rest Machining...Defect or idiot? (build 839)

Software Carbide Create
1

I’m a little confused…I thought I’ve done this before, but for some reason, it’s not doing what I expect.

The setup couldn’t be simpler…I want to route a rectangular 1/2" deep groove in a board between the two rectangular lines:

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The gap between the lines is 5/16"

I cut the initial pass with a 1/4" 201…

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Now I’d like to clean up the corners with a 1/16" bit to get them a bit more square…
SO I put down another pocket path and choose Rest machining, and put in .25 diameter as my previous bit:
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As you can see, it’s running the 1/16 bit through the entire pocket…paying no attention to what was cleaned out by the 1/4 bit. The resulting toolpath is showing up to take 397 minutes!
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Something is not right, right? Shouldn’t I just get the little corner cuts to remove the parts of the groove the 1/4 can’t reach on its two passes??? What am I missing?

Bug or am I a dope?

  • Gary

[EDIT] I know how to fix the problem…I just have to exclude the inner rectangle on the second toolpath … then it does exactly what I would expect it to do…but that leans me towards bug…because it really shouldn’t be any different.

2

Can you share the file?

3

I have seen similar behavior with my designs when trying to rest machine, so you’re not alone.

1 Like
4

But of course…
GJM - Rest Issue - 839 Win 11.c2d (52 KB)

I put in two toolpaths…one selecting the inner and outer, one selecting only the outer.

1 Like
5

Might be this problem again / still:

Instead of entering the previous size, try entering (previous size - current size) as the previous size. If that works, then you are running into this bug.

6

Here’s another example showing the defect. A circle slightly larger than 1/4". First pocket using 1/4" bit. then using 1/8" bit.

EXPECT - First toolpath clears everything. Second toolpath empty:
ACTUAL - Second toolpath clears entire area.

Rest Test.c2d (44 KB)

1 Like
7

It’s not safe to conclude, just from this situation, that I’m not an idiot…but it does look like a bug! :slight_smile:

2 Likes
8

I tried your file, and it looks like we broke it, if I’m looking at it correctly. We’ll get it fixed.

3 Likes
9

We went through your files and found (it seems) a mistake in our code that caused the rest calculation to fail when the pocket areas were barely larger than the first cutter.

It seems to work for both of your files now, so that will be available in the next release.

3 Likes
10

Thanks Rob! It just keeps getting better…And…BTW: I need to do this for a client, so it couldn’t be fixed at a better time!

11

We’ll try and get a build posted today.

4 Likes
12

Posted: Carbide Create Beta Downloads

1 Like
13

Fixed. Thank you! I’ll check it out in lumber over the next couple of days…

1 Like