Toolpathing/cutting problem

[myxpykalix]

I am trying to make a 4" round cutout .75 thick with a inside hogged out with a lip .25 thick and about .15 below the outside perimeter.

Imagine 2 .25 thick wooden rings one inside the other and the inner one being .15 below the height of the outer one.
This happens when i try to cut the .25 circular toolpath for the inner ring down .15
When I toolpath it and preview it in shopbot 3 as a profile cut it shows it doing a circular cut then its done.
However when i take the toolpath and start it the router goes to the start and plunges down,puls up, moves over a few thousandths, plunges down, pulls up and repeats as if it is doing some type of drilling toolpath.
I cut a different perimeter cut ok with no problem. Any ideas why this is doing this?
7928

[bthoron]

Is there something in the code doing this? Can you post it or at least the suspect section?

[pfulghum]

Which software?....
PartWorks, PartWizard, ArtCam?

If you post the file somewhere, or email it to me, I would give it a quick look.

-- pat

[bill_l]

Jack,

You have to be using VCarve because I ran into the same results when I tried to pocket the area between two circles. I'll send the file I was working on to Tony and I'm sure they will have an answer right quick.

Bill

[scottcox]

Jack,

I may not understand this correctly, but if you're trying to pocket a .25 inch circular path with a .25 inch bit, I would expect those results. Offset your inner vector slightly to give you a bigger path when using a .25 inch bit, or use a smaller bit for that path.

[myxpykalix]

using partwizard to toolpath and the new control software previewer it went in the circular path you would expect but when you implemented the cut file it did that. I will try to redo it and use a 1/8th inch endmill this time. thanks

[beacon14]

Scott is correct, this issue was covered on the Vectric forum recently. The path must be wider than the bit (by as little as .001") to do a pocketing toolpath. Since you are hollowing out the interior even deeper you can offset the inside line even more without causing problems, which I like to do to make sure there are no issues where the two toolpaths overlap.

In fact you can just pocket the entire larger area .15" deep as a first pass and then start the deeper pocketed area from the .15" depth.