Z axis not working properly February 20, 2016 02:53AM |
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Re: Z axis not working properly February 20, 2016 07:23AM |
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Re: Z axis not working properly February 20, 2016 07:04PM |
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Quote
I would use a standard cantilever configuration (rail - screw- rail) on one side of the bed and then add a second screw on the opposite side.
Re: Z axis not working properly February 22, 2016 03:20AM |
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Re: Z axis not working properly February 22, 2016 07:25AM |
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Quote
it got stuck. It is not possible for the 4 rods to be completely 100% parallel
Re: Z axis not working properly February 22, 2016 07:34AM |
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Re: Z axis not working properly February 23, 2016 04:23AM |
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Re: Z axis not working properly February 23, 2016 04:28AM |
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Re: Z axis not working properly February 23, 2016 08:06AM |
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Re: Z axis not working properly February 23, 2016 10:21AM |
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Re: Z axis not working properly February 23, 2016 10:58AM |
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Re: Z axis not working properly February 23, 2016 02:47PM |
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Re: Z axis not working properly February 24, 2016 07:35AM |
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Re: Z axis not working properly February 24, 2016 07:54AM |
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Re: Z axis not working properly February 24, 2016 10:46AM |
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Re: Z axis not working properly February 24, 2016 10:57AM |
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Re: Z axis not working properly February 24, 2016 11:02AM |
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Re: Z axis not working properly February 24, 2016 11:04AM |
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Re: Z axis not working properly February 24, 2016 07:07PM |
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isn't that 5% for microstepping? Using a geared nema17 maybe an option?Quote
the_digital_dentist
Motors do not step perfectly- there is typically a 5% spec on step to step position. What happens when the motors don't step exactly the same, say one is +5% and the other is -5%? Combine that with microstepping and I think that you're asking for a lot of easily avoidable trouble.
Re: Z axis not working properly February 24, 2016 08:42PM |
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Re: Z axis not working properly February 25, 2016 02:46AM |
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Re: Z axis not working properly February 25, 2016 04:44AM |
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You're right, I should have search for it [www.geckodrive.com]Quote
the_digital_dentist
Nope. The basic spec on the full step accuracy is usually 5%. That's why going to >16:1 microstepping doesn't result in increased resolution (it will reduce noise and vibration, but you won't get finer positioning precision).
geared (27:1) Nema-17 3NM, will give you 0.067° per step. At 12V I get a max of ~50RPM out of it. USD28 [www.omc-stepperonline.com]Quote
the_digital_dentist
A geared motor will increase torque but reduce speed. If you can live with the reduced speed (usually OK on the Z axis), it should be OK, but a geared NEMA-17 motor often costs more than a NEMA-23 motor depending on the torque/size of the motor. The Z axis in my printer has a 20 tooth pulley on the motor and 42 tooth pulleys on the two Z axis screws.
Here's a NEMA-23 motor that provides about 2.5X more torque than you can get in an ungeared NEMA-17 motor for $27 shipped. It even has an antivibration mount: [www.ebay.com]
Re: Z axis not working properly February 25, 2016 08:40AM |
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Re: Z axis not working properly February 25, 2016 09:57AM |
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Re: Z axis not working properly March 27, 2016 02:30AM |
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Re: Z axis not working properly March 27, 2016 03:40AM |
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Re: Z axis not working properly March 27, 2016 06:32AM |
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Re: Z axis not working properly March 27, 2016 07:08AM |
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