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