Some things I have learned so far
P5 sanyo is sinusoidal
Trapezoidal drives tend to not work well with a sine motor, cogging,heat, missed steps.
Sine drives are expensive and there are not as many that take step and direction. $700-1500 ea
There is what is called a Suedo-Sinusoidal drive that works well with a sine motor but is less costly. I am looking for a reference on the web.
I found a site last night that explained it all but I can't remember where it was. As soon as I locate it again I will let everyone know. TP