Re: Z-axis March 03, 2014 09:03PM |
Registered: 13 years ago Posts: 2,947 |
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Re: Z-axis March 03, 2014 11:25PM |
Registered: 10 years ago Posts: 1,381 |
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Sublime
But with this system the belt can stretch between the roller and the fixed points at the ends
which kind of defeats the purpose of a rack and pinion belt system.
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Sublime
most of the motors holding torque would be used up just holding them up.
Re: Z-axis March 04, 2014 12:21AM |
Registered: 13 years ago Posts: 2,947 |
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A2
Neat linear drive-guide integration.
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Sublime
But with this system the belt can stretch between the roller and the fixed points at the ends
which kind of defeats the purpose of a rack and pinion belt system.
The available length of belt that can stretch is cut in half with a rack and pinion linear belt (ServoBelt, Belt-on-Belt drive, Tractoring) drive arrangement compared to a static motor.
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A2
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Sublime
most of the motors holding torque would be used up just holding them up.
I imagine that there is an on line calculator to help determine how much mass/weight the drive line/transmission/stepper motor could move, and the output torque, force, etc. Josef Prusa calculator is close, probably wouldn't take much to modify it.
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Re: Z-axis March 04, 2014 02:37AM |
Registered: 10 years ago Posts: 1,381 |
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Sublime
Are you meaning simply because the belt is only half the length it will have half the stretch of a conventional belt system?
I can see how that would be true and an improvement.
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Sublime
putting the weight of the motor on the platform would make it really easy to overcome the holding torque.
if this is for a Mendel style machine with the X axis motor and the extruder motor all being held up too I would be really worried.
At that point I think you would need to gear it down.
Re: Z-axis March 04, 2014 05:41AM |
Registered: 10 years ago Posts: 4 |
Re: Z-axis March 04, 2014 12:20PM |
Registered: 13 years ago Posts: 2,947 |
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Re: Z-axis March 04, 2014 02:07PM |
Registered: 10 years ago Posts: 4 |
Re: Z-axis March 04, 2014 02:55PM |
Registered: 13 years ago Posts: 2,947 |
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Re: Z-axis March 04, 2014 03:42PM |
Registered: 10 years ago Posts: 4 |
Re: Z-axis March 04, 2014 06:55PM |
Registered: 10 years ago Posts: 1,381 |
Re: Z-axis March 04, 2014 07:06PM |
Registered: 13 years ago Posts: 2,947 |
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A2
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Sublime
If what you are looking for is the system that will give the best surface finish I would go with a belt or cable driven Z axis
Do you have a link that demonstrate how to implement a cable driven Z axis.
Tks.
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Re: Z-axis March 04, 2014 09:17PM |
Registered: 10 years ago Posts: 1,381 |
Re: Z-axis March 26, 2014 03:24AM |
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Re: Z-axis March 28, 2014 03:22PM |
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Re: Z-axis March 29, 2014 11:07AM |
Registered: 13 years ago Posts: 2,947 |
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dissidence
i am thinking about going to this type of z axis lift system, but i was thinking about just going to a pulley over a geared stepper, i have one an they are remarkably stiff.
or do you have stl files of your parts there a guy could try to print first.?
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