4596
« on: June 03, 2010, 02:55:06 PM »
Neil,
Consider the following:
I would guess that the screw is not even straight within 1/16" ( .062") in 5 feet. So chances are that you will bind unless there is enough
motor torque to deflect the screw and keep it turning unless there is additional slop. I would adjust the screw position at each end
and see what happens in the middle.You may need to comprimise some.
Then do some rapids away from the ends, and end to end, and see what the max velocity you can get till it skips. Then cut the velocity in half.
Get a piece a scrap material ( worst case stuff you will be using) and now do some cuts at the ends and also the middle of the travel.
The depth should be the deepest you will cut. You will quickly come to some velocity and acceleration value where you can have confidence
with your machine.
Speed is nice, but is not worth crap, unless in the end the part can be machined. You have what you have and don't compare to something else
which is different.
Now if you are not satisfied with the results then change the machine to suite the desired operating conditions.
So consider experimenting to see what works for you.
FWIW....
RICH