Linear Actuators Stewart Platform

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Re: Linear Actuators Stewart Platform

Postby Enraged » Thu Jan 26, 2012 6:46 pm

Is there any reason you couldn't use belts like on the 2.x?
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Re: Linear Actuators Stewart Platform

Postby bdring » Thu Jan 26, 2012 7:56 pm

Is there any reason you couldn't use belts


You could, but just like a Z axis on a CNC router, you need to be careful that it does not free wheel down when power is removed. If it is light enough and the stepper detent torque is strong, you may not need to do anything. A weight on the return length of the belt could help. It would only need to be enough to augment the detent torque of the steppers.

Another thing I often thought about was having a relay switch one or more sets of motor coils into a direct short. That would significantly increase the off torque. On some portable CNC devices like a printer or little router, the X and Y can slide around in transit. I thought that shorting feature would nice passive brake on the system.
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"If you didn't build it, you will never own it."
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Re: Linear Actuators Stewart Platform

Postby Enraged » Thu Jan 26, 2012 9:53 pm

more browsing led to finding this: http://reprap.org/wiki/Delta

basically, these guys are trying to get a delta robot 3d printer working with ReplicatorG, which is the software that makerbot and alot of other 3D printers use.
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