Re: Higher performance systems

I am not too smart but I think it's hard to achieve 1000 ipm with a 5
pitch screw. It would need to turn at 5000 rpm. Unless the screw
was very short(in which case why would you need to go 1000 imp), it
would be tough to keep it from whipping wildly. On the other hand it
could probably be done quite easily with a belt driven gantry or a
rack and pinion type drive system.

I made a gantry router mostly from aluminum extrusion, it has a
38x25x5" work envelope. I used gecko 320s and 115 volt, 1.1 Amp dc
motors. I run the drives at 70 volts. I am guessing the gantry
weighs 40 lbs and it accelerates to 200" per minute (max) in .35
seconds. The screws are 3/4-6 acme screw. The long screw (48")
whips a bit when the axis is at the ends.

Eric

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
<mariss92705@y...> 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
>
> Mariss