I don't know if I'm barking up the wrong tree, but if the shaper tool has positive rake and resistance to that, on the part of the work, the cutting tool can seek to "dig in".
When thinking shaper, Stop thinking lathe! when a lathe tool starts to cut on a lathe, the more the force the less the engagement of the tool, as the force pushing down pushes the tool away(provided it's on centre).
If the centre of rotation on the shaper cutter is ahead of 90° to the work the force will try to push the tool deeper. If the tool is beyond the 90° point there will be no problem.
It's simple in my simple mind but I don't know if I'm explaining myself adequately.
Or at all.
When thinking shaper, Stop thinking lathe! when a lathe tool starts to cut on a lathe, the more the force the less the engagement of the tool, as the force pushing down pushes the tool away(provided it's on centre).
If the centre of rotation on the shaper cutter is ahead of 90° to the work the force will try to push the tool deeper. If the tool is beyond the 90° point there will be no problem.
It's simple in my simple mind but I don't know if I'm explaining myself adequately.
Or at all.
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.