Unable to set depth on Vpocket

[Jim Pritchett]

Great program, but it is kicking my butt on one thing.  I can't seem to figure out how to set the dept of cut for a 'Vpocket' operation. I've tried all the usual things, but no matter what I change, the pocket comes out to be .51 deep.  

I'm using Inkscape for the initial paths but I am using Gcodetools extension to create my default workspace.  Current depth setting in Gcodetools "orentation points" is .019. 

 

Admittedly I don't really understand everything that is going on in JScut when you select Vpocket, but it seems to give me just what I want except for the depth of cut. 

JScut pass depth is set to .125 ,material thickness is set to .2,  and I have tried other settings there to no avail. 

Any and all help gratefully appreciated.

(attached Gcode file)

[Todd Fleming]

Here's a cutaway sketch of what V Pocket does:

Here's what I planned to eventually implement, but never got around to:

V Pocket tries to fit a single V channel into your shape; the shape and cutter angle control its depth. Nothing else does right now.

Todd

[Jim Pritchett]

Thanks for that information Todd.  I really appreciate the work you did on this.  If I were to change the cutter angle to something greater than 60 would that have any effect on the depth? 

[Todd Fleming]

Greater cutter angles reduce the depth, but if the cutter you use on your CNC machine doesn't match the angle, it will produce a distorted outline.

[Jim Pritchett]

:) Oh well, so much for that idea.  I'll keep checking in to look for new features. 

Just to make sure that I'm understanding completely, if I have a .250 piece of wood and I want to cut a vpocket with a 60 deg bit I'm going to cut through it by an additional .250.  I hope I'm missing something here, but that is what I'm understanding. I think I must be missing something.  

[Todd Fleming]

Yes. Here's a couple things you might try:

• Place sacrificial wood under it while cutting. Your final piece will have holes, but you could glue laminate, paper, or some other material to its back.
• Make your outline thinner before bringing into jscut. Inkscape's Path -> Dynamic Offset can do this.

On Saturday, May 7, 2016 at 11:06:40 AM UTC-4, Jim Pritchett wrote: