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belt and puuley vs all thread

Posted by GITRDUN

GITRDUN

belt and puuley vs all thread
May 13, 2012 09:23PM

Registered: 14 years ago
Posts: 253

I am wondering what the reason is for using belts and pulleys to drive the axis instead of just using simple all thread and a nut. Seems to me the all thread would be cheaper and simpler. Is it not as accurate or something?

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crutonius

Re: belt and puuley vs all thread
May 13, 2012 09:25PM

Registered: 14 years ago
Posts: 20

The reason I've read is that a threaded screw isn't nearly as fast as a belt and pulley.

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LT1Pat

Re: belt and puuley vs all thread
May 13, 2012 09:40PM

Registered: 14 years ago
Posts: 32

Can you imagine the Z axis speed for the X&Y? smiling smiley

crutonius Wrote:
-------------------------------------------------------
> The reason I've read is that a threaded screw
> isn't nearly as fast as a belt and pulley.

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NelsonRap

Re: belt and puuley vs all thread
May 13, 2012 09:56PM

Registered: 15 years ago
Posts: 862

speed

__________________________________________________________________________
Experimenting in 3D in New Zealand

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GITRDUN

Re: belt and puuley vs all thread
May 13, 2012 10:05PM

Registered: 14 years ago
Posts: 253

So in other words you can achieve a higher rapid speed rate using a pulley system rather than a threaded rod. That makes sense since the distance of movement in one turn of the motor is dependent on the diameter of the pulley which would be much greater than the distance of one thread pitch on all thread.

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Pointedstick

Re: belt and puuley vs all thread
May 14, 2012 11:19AM

Registered: 14 years ago
Posts: 411

Backlash is a factor too. You can actually get going *fairly* fast with the right kind of leadscrew, but unless you have a complicated ballscrew nut, the backlash when it reverses direction will be unacceptable. And once you've gone with a balls crew, you've greatly exceeded the cost of a belt and pulley.

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banthafodder7400

Re: belt and puuley vs all thread
May 14, 2012 02:12PM

Registered: 14 years ago
Posts: 127

Speed is definitely the big thing like pointed out. My senior design team had made a laser inspection system for $14k with a really high pitched lead screw on the x axis. Lets just say it took forever to move 24" to the other end of the part we were measuring, but we were super precise and accurate.