Barrel stabilazation

Sungod,

I've got my system constrained.  While I am happy with my system, I would strongly recommend against doing it the way you are talking about.  When you constrain it you take away all the flex and give in the system.  This makes it especially important for everything to be aligned properly and held in an aligned position regardless of the load on the auger.

For me I made a stiff frame that couples the barrel and motor together.  The thrust system had to be completely redesigned to make  it so when the auger slides back (thrust) a special thrust bearing goes into a recessed plate thats also hard coupled to the motor and auger.  This recess keeps the auger from being able to move and holds it constrained. 

The downside is that everything has to be straight.... the upside.... I can't tell any difference in how it runs other than it seems to make less strange noises.  I only went to this system because it was easier for me to work with metal and make it this way than to rebuild it like it was stock after I screwed up

Looks like I have to give this some more thought, but assuming I accept a bit of misalignment be it from auger itself or from some not parallelness, would the amount of play be the same when I switch to the stronger motor? And therefore the risk of the barrel twisting the same?

Ah that makes sense, ill keep that in mind.

Tolerance? Not sure what you mean by this, as it isn't a typical specification of fuses - at least not one you have much say in besides slow-blow or fast blow.

Measure current draw in steady state with the polymer you want to use and temperature. Pick a fuse 1.5x-2x that.