Tool path sizing

[bill565]

Greetings I purchased a type A design.
In setting up the roughIng path, it looks like the tool path is outside the boundarY for the final carving. When I use the finish with smaller steps it also looks like it exceeds the boundary?

In looking at the purpose for type A files, I am wondering if it is for cutting out purposes. I am not wanting to cut out the design, but incorporate into a pocket for a presentation with flat design, not dished.

Question - is the r pass larger then model, or is set dimension the final boundary with no passes outside?
Are there any settings that can reduce the overage if this is the case?

Thanks for your help. I am away from pc but if picture helps let me know.

Bill

[rej]

type a cuts all the material down to the base of the model within the perimiter you have set for a boundary outside of the model boundary.

to cut this in a pocket, simply choose the pocket boundary, hold select and select the model, and then toolpath. use small enough bits to fit in the areas of travel.

[rej]

the model height in this case is .3538, that can be adjusted.
but if left alone, the finish pass cuts this to a depth of .3540

now lets say i want the pocket to be at a depth of .60. i subtract .3540 from .60 = .2460.
so i cut a pocket .2460 then- since i am only cutting .3540 deep at the max depth, i would just run a finish pass most of the time.
i would zero my bit to the bottom of the pocket and run the finish pass.

someone correct this if this is wrong.

[Adrian]

Bill, what software are you using? Is it 3D Machinist?

[bill565]

Thanks, Yes 3d Machinest imported to VCP.

The issue is not depth, but the toolpath for x and y being greater (I think) than the actual size intended.
I have other items that are dependant upon the final size, such as a frame that I am pocketing with text. The size actually routed further than anticipated, so my question is how much overage do I have to allow for.

I have attached the roughing preview so you can see the toolpath exceeding the size of the model.

Hope this helps to show what I am talking about.

Thanks again for the assistance.

Bill

[JamesB]

Bill - when using Machinist the A-style model is designed to be cut-out. So the rough and finish toolpaths will go past the edge. This is to ensure the sides of the part are cut as well as the top. When you do the cut-out pass the edge of the part will be its original borderline (allowing for tool radius). If you import the rough and finish toolpaths into VCP then you should be able to create pocket toolpaths around the part to have the object sitting within a flat area. They just need to be deep enough to cut below or at least to the depth of cut of the rough and finish as it rolls down to the base of the edge of the model.

Hope this makes sense - post again if not. Make sure to rely on the Toolpath Preview to get the toolpaths right in VCP.

Thanks,
James

[bill565]

Thanks James

Is the path larger than the finish by the diameter of the bit being used?

Just trying to work out the sizing.

Thanks again, bill

[JamesB]

The toolpath should go past the edge slightly more but close to the radius of the tool being used so in effect it will be overcut by the diameter of the roughing tool (assuming its larger than the finisher), plus possibly any material allowance added in the Roughing stage.

Thanks,
James