Re: [CAD_CAM_EDM_DRO] Re: Higher performance systems

Mariss Freimanis wrote:

>Jon,
>
>Indulging in a little "calculator fun" shows 746W (1 HP) accelerating
>a 396 lb load to 1,000 IPM in 43 milliseconds; acceleration distance
>is 0.36".
>
>Identities used:
>
>1) 1 HP = 550 ft-lbs / sec.
>2) 1G acceleration (a) = 32 ft / sec^2
>3) v (ft / sec) = at
>3) s (ft)= at^2 / 2
>
>
>

At first I thought you had made a mistake that the motor was producing
a constant 1 HP from near zero speed, which would be wrong in most
cases. But, after following your calculation, it seems OK. I still
have a hard time believing this result - it just seems too fast an
acceleration. Of course, you have neglected all friction and cutting
forces,
which are often not negligible. Of course, a Bridgeport table with drive
probably weighs more than 396 Lbs, the table plus saddle (Y axis) is
even more.

Jon