Why is it running off at random?

[ger21]

The only con is the price, although I think the Xylotex is not powerful enough to use the 5 start.

Also, 1/2-8 2 start is quite a bit cheaper than 1/2-10 2 start. About $20 cheaper for a 6' screw.

5/8 has more inertia, so it may hurt your accel a little. And I use Dumpster nuts, which you can't get in 5/8".

[Zaaephod]

Gerry,

I've never used a screw with more starts than one. Does using a 2 start screw with the same TPI double your linear speed at the same rpm?

[SpookyDad]

Ok I redid the job. The first time I had a glitch. During a straight X cut, the Y had a little freak out. The funny thing is it went back to the correct position on its' own. I didn't even notice it until I was removing the work. The second time it ran fine.

It is the cut between the circles. The code calls for it to cut out the panels last so it is going around the rectangular perimeter.