Need a little help plese

[GripUs]

Okay…here is the situation. I am trying to carve some gavels on the rotary. The pictures show the roughing toolpath being executed. What you are seeing is two attempts with one being cut deeper. The gavel was, indeed, rough cut as desired except for the two “trenches” 180 degrees from the “A” zero.

The finish file cut it just like it was supposed to without following the roughing extra deep pass in the “Trenches.”

I can’t post the crv file as I baked a 3D model into it and the model is copyrighted. I tried to make sure the width of the component was the same as the width of the material determined by the unwrapping process. The problem I ran into was Aspire kept changing the numbers when I tried to set them precisely.

With this sparse bit of info can anyone get me going in the right direction?

I am posting this on the CAMaster forum as well since it may be my unfamiliarity with the lathe that is the problem.

Joe

[esteeme1]

Joe,

I don't have a 4th axis but have been looking into purchasing one. This is more a question than an answer to your problem but is intended draw focus on the material thickness setting. I believe the material thickness is the radius not the diameter??? If so if the radius 1.1875 the the circumference would equal 3.730 C = 3.14159 x 1.1875.

If the width of your material is correct I think it should equal the circumference. Calculating from the material width the material thickness should be 2.375. If I am completely wrong please let me know. Good luck.

[esteeme1]

Never mind, I got rapped up in the problem and didn't multiply the radius. Sorry

[dealguy11]

It looks like the bit is "falling off the edge" of the component, which is what makes the trenches. As the center point of the bit goes beyond the edge of the component, it starts to travel down the radius of the bit towards the center until it reaches the end of the cut. If it goes too far beyond the end, it will plunge all the way to the center of the part (not good).

I usually increase the size of my part in the direction of rotation - i.e., on my machine, the a axis is parallel to x, so y rotates around x. Therefore, in the job setup, I add length to y - usually around .25 to .5 inch. When I create the component I create it to the full length of y. Finally, when I create the bounding box for the actual cutting, I make it a little less than the (new) full length of y, but a little more than the actual circumference of the part so that it will wrap a little more than 360 degrees, but not fall off the end of the component. The thickness of the part is what determines the radius, so adding a little to the length of the turned axis just makes it wrap a little further.

Hopefully that made sense.

[Greolt]

My best guess is that you did not select a bounding box for the toolpath and relied on the material/model size. Hence it "fell off the edge".

Sorry if this is incorrect but without the crv3d file it can only be a guess.

Always remember that the Aspire PP does not do anything magical with the toolpath when it wraps it.

On the contrary it simply changes one axis definition (eg. changes the letter Y to A) and scales those same positions.

Look at the toolpath before wrapping, as an X Y toolpath. (in the flat)

If it does not fall off the edge there, then it won't when wrapped.

Greg

[cabnet636]

joe, greg wrote the pp for us and he and others are right, if the machined area has no definition it will machine it all including over the edge.

i have been kown to leave a hair of material and just sand it off