I need a “Circular Cutoff Tool” (for a automatic lathe) that I’m designing in Sketchup (Pro). Here’s a view of a similar design:
The face that’s colored yellow is critical to properly machining the part and is the controlling surface for the tool. The face is 1/4" below the centerline of the hole (which is 5/16" diameter). The radial dimension from the center of the hole to the outermost tip of the colored face is 1.5". In order for a machinist to make the tool on (a different) lathe, I need to provide dimensions of the profile that is defined by a section that is positioned about the center of the hole as shown below:
Obviously (or maybe not!), the geometry of the yellow face of the first image above (the “working” portion of the cutoff tool) is slightly different from that of the section cut.
I could work through all of the messy geometry/trig to evaluate the dimensions of the section cut but I think sketchup can do the hard work more easily.
Here’s an animate GIF of my attempt to do so:
I first created a properly dimensioned face for the working portion of the tool and then create a circle whose center is properly oriented for mounting into the machine.
I select the circle that represents the hole (bore) of the tool and attempt to use the “Follow Me” tool using the face. You’ll see that although the surface is extruded around the circle, its dimensions also change (thus making the result unusable).
The SKP file is attached below.
Any ideas on how I can extrude the face about the circle while maintaining the dimensions and without changing the geometry of the cutting surface?
Example.skp (85.7 KB)