Re: Building a concrete 3D printer - need help with movement December 22, 2015 03:11AM |
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Re: Building a concrete 3D printer - need help with movement December 22, 2015 03:51AM |
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Re: Building a concrete 3D printer - need help with movement December 22, 2015 04:29AM |
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Re: Building a concrete 3D printer - need help with movement December 22, 2015 05:27PM |
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Re: Building a concrete 3D printer - need help with movement December 22, 2015 07:33PM |
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Re: Building a concrete 3D printer - need help with movement December 23, 2015 01:34AM |
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Re: Building a concrete 3D printer - need help with movement December 23, 2015 08:47AM |
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Re: Building a concrete 3D printer - need help with movement December 23, 2015 10:38PM |
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Quote
mekastudios
I'm not sure I get what you mean with the pulley and counter weights.
---project we're completing with a university in Singapore
Re: Building a concrete 3D printer - need help with movement December 24, 2015 02:34AM |
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Re: Building a concrete 3D printer - need help with movement December 24, 2015 02:43AM |
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Re: Building a concrete 3D printer - need help with movement December 24, 2015 07:08AM |
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Re: Building a concrete 3D printer - need help with movement December 24, 2015 07:19AM |
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Quote
PRZ
Your motors are high torque Nema 23 motors.
Their inductance is 17mH which is 5~10 times the average printer motor.
They need fairly high voltage to run properly, and you may consider 36V as a minimum.
3D printer stepper driver are not designed for such motors.
Your machine size and design is more like a CNC router than a printer, so you shall use CNC stuff instead of 3D printer.
You need to set external drivers usually used for CNC router/mill.
Re: Building a concrete 3D printer - need help with movement December 24, 2015 07:28AM |
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Re: Building a concrete 3D printer - need help with movement December 24, 2015 07:49AM |
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Quote
dc42
Quote
PRZ
Your motors are high torque Nema 23 motors.
Their inductance is 17mH which is 5~10 times the average printer motor.
They need fairly high voltage to run properly, and you may consider 36V as a minimum.
3D printer stepper driver are not designed for such motors.
Your machine size and design is more like a CNC router than a printer, so you shall use CNC stuff instead of 3D printer.
You need to set external drivers usually used for CNC router/mill.
I respectfully disagree. The motors are rated at 1.8A (see the first post in this thread) and the drivers are DRV8825 with heatsink correctly mounted on the opposite side of the PCB to the chip. So he should be able to run the motors at 1.5A or 1.6A, which is about right for a 1.8A motor. The phase resistance is 2.75 ohms so the voltage drop at 1.5A is only 4.1V. So even with two motors in series, a 12V supply would just about be OK at low speeds (we are talking about the Z axis here), but in any case he is using a 24V supply. It's only for high speed movement that more than 24V would be needed.
Re: Building a concrete 3D printer - need help with movement December 25, 2015 03:03AM |
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Re: Building a concrete 3D printer - need help with movement December 25, 2015 11:32PM |
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Quote
mekastudios
@cozmicray
We tried a very quick iteration of the Pulley system and although it worked, the movement was still very unreliable.
The sprockets are 15-teeth and we use a chain to drive the axis.
Already placed an order for the lead screws and other necessary stuff, just a matter of waiting now and testing those.
Re: Building a concrete 3D printer - need help with movement December 26, 2015 12:50AM |
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Re: Building a concrete 3D printer - need help with movement December 28, 2015 02:53AM |
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Re: Building a concrete 3D printer - need help with movement December 29, 2015 09:53PM |
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Re: Building a concrete 3D printer - need help with movement December 29, 2015 10:37PM |
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Re: Building a concrete 3D printer - need help with movement January 06, 2016 11:12AM |
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Re: Building a concrete 3D printer - need help with movement January 06, 2016 05:00PM |
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Re: Building a concrete 3D printer - need help with movement February 13, 2016 02:45AM |
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