rounding corners

[adowty]

Hi all,

After using cut3d for several months, I recently needed to do some 2d work.
in vcarve pro, I needed to cut a simple rectangular pocket.
I drew my rectangle and chose a bit that was acceptable as the radius for rounded corners.
I made the pocket path to start in the middle and spiral outward toward the edges (forgot the software speak for this, conventional or build).
I noticed that when it got to the outer edges, it did three of the corners as expected, but then rounded the final corner.
In other words, I was left with a rounded rectangle with three corners that were the radius of the bit and one that had a significantly larger radius.

I also did a simple path where it would cut a channel on a line.
At each pass, it plunged in, cut the length of the line, but began to ramp up the x axis toward the end of the line.

Are these behaviors related and why are they happening?

Andy

[drueth]

adowty

If the board you are cutting does not look like 3d preview something is wrong. The big question is what is wrong. I would like to see the photo for the first problem to get a better idea what you are doing, also were you using an EM bit ? As far as the second problem are you sure the router is not move up in the clamp or the bit was tight in the collet. Was the cut to agressive for the Shark to handle, how fast were you going how deep was the cut what kind of wood were you using. in your post you are saying "ramp up the X axis" X would be side to side Z would be UP or down. Again not sure I am following you. If you can post a photo I sure somebody may have a better idea what is wrong.

[Eagle55]

My first thought is that with your experience with C3d is that your machine is set up right and the that there may be something in the CRV file that is telling it to do what it is doing. Like was mentioned, it would be helpful to see in a photo what is happening and maybe post the CRV file too so that we can look for any possibilities.

Roger

[adowty]

adowty

If the board you are cutting does not look like 3d preview something is wrong. The big question is what is wrong. I would like to see the photo for the first problem to get a better idea what you are doing, also were you using an EM bit ? As far as the second problem are you sure the router is not move up in the clamp or the bit was tight in the collet. Was the cut to agressive for the Shark to handle, how fast were you going how deep was the cut what kind of wood were you using. in your post you are saying "ramp up the X axis" X would be side to side Z would be UP or down. Again not sure I am following you. If you can post a photo I sure somebody may have a better idea what is wrong.

Sorry, yes, I meant z axis.

[adowty]

Thanks guys, I was hoping someone would say "oh yeah you left the whatzit button on" or something.

I'll get crv files and photos together this weekend.
As I said, I am not doing a lot of 2d work.

Andy

[4DThinker]

If the bit climbed up during a cut, either the whole router was slipping up in the clamp or the bit was slipping up in the collet. If you were using a spiral down bit then I've had that happen to me before. Essentially the bit tries to screw itself up as it spins.

As for the one-corner error, I'd need to see the CRV file.