Re: [CAD_CAM_EDM_DRO] No Torque (power?)

I concur with this assesment
"Remember, if you reverse the pulleys, you'll get 4 times more torque at
the screws than you have now. A 2:1 speed slowdown would get your 192 Oz-In
motors up to 384 Oz-In, which is getting respectable. With the 2:1 speed-UP
you only have 96 Oz-In, which is totally pitiful, and why you get no
motion."

My steppers are size23 doublestack 2.1amp and are on 2:1 pulley
arrangements, if you tried to stop them with your fingers at the lead screw
you'd need a skin graft!

I cant recall if anyone has mentioned this but although the steppers are
"rated" at 4.2v, they are driven (supplied) at 29v ,the amps remain the
same, if you are driving them at their rated voltage you will get bugger all
out. sorry if this is stating the obvious.

Nick

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, May 21, 2004 6:00 AM
Subject: Re: [CAD_CAM_EDM_DRO] No Torque (power?)


>
>
> Weyland wrote:
>
> >On Thursday 20 May 2004 10:02 pm, Andy Wander spake:
> >
> >
> >
> >>With a bigger pulley on the motor and a smaller one on the leadscrew, it
> >>will go FASTER with LESS torque. You should swap the pulleys, and it
will
> >>go SLOWER with More torque.
> >>
> >>
> >
> >I understand about the bigger pulley/smaller pulley issue, but my
> >point is that it's not an issue *yet* because you can stall the motors
> >with two fingers with less pressure than opening a door knob at this
> >point, *without* them hooked up to anything.
> >
> >
> >
> Well, that is about what 192 In-Oz feels like! (I think that was your
> rating.)
> You just don't get much torque out of these small motors. I used 300
Oz-In
> motors on one of those 150 Lb minimills, with 1:1 drive and a 16 TPI
> leadscrew.
> It was JUST barely enough.
>
> Remember, if you reverse the pulleys, you'll get 4 times more torque at
> the screws than you have now. A 2:1 speed slowdown would get your 192
Oz-In
> motors up to 384 Oz-In, which is getting respectable. With the 2:1
speed-UP
> you only have 96 Oz-In, which is totally pitiful, and why you get no
motion.
>
> Jon
>
>
>
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