Can't get form tool to render correct shape in 3D preview?

[timdiacon]

I've got a form tool setup in the database which has a profile as below:



However when I run the 3D preview I just get the following result:



The depth of the cut in relation to the tool are correct and it's only doing a single pass. I get the same problem with all Form tools regardless of their shape however a vbit renders as expected. What am I doing wrong?

[adze_cnc]

It would be a horrendous task to write the software to deal with "undercuts" when simulating a cut. A dovetail bit is a good example of this and the waist area of your form is another.

[Rcnewcomb]

Can I create a tool with an undercut?
No, the Form Tool will not allow a bit with an undercut to be modeled since toolpaths using bits with undercuts cannot be previewed.

If you need to use a bit with undercut in a project, you can create a toolpath using a standard bit but run that at your machine with the undercut bit installed.

For example, you want to create a T-slot using a T-slot bit. You can create a toolpath using an end mill and preview that, realizing at your machine there will be a horizontal slot cut at the bottom of the toolpath. To do this safely and successfully, you need to have a good understanding of toolpaths, how to set up a single pass toolpath and possibly the use of Lead-ins and Lead-outs.

If you need help setting up a particular toolpath, asking on the Vectric Forum should get you the help you need.

[FixitMike]

Vectric products model the material and cuts as surfaces. Since only the surface (top) is represented, there is no way an undercut can be handled as such by the program.

[Adrian]

I'm surprised you were able to make a form tool in that shape to start with.