Z Axis Belt drive April 08, 2016 05:49PM |
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Re: Z Axis Belt drive April 08, 2016 06:58PM |
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Re: Z Axis Belt drive April 08, 2016 08:53PM |
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Dust
Much lower resolution (compared with a standard m5)
WHY? --- 20 tooth pulley --- 37mm circumference ---- 0.01mm/step(1/16 stepping un-geared)
Also when power is removed the carriage will fall
I'll use geared stepper or stepper with brake
Any belt stretch (which is inevitable) will break this... something need to be adjustable
With one continuous belt -- stretch so what?
Will stretch in one print run be that much?
Re: Z Axis Belt drive April 08, 2016 09:19PM |
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Re: Z Axis Belt drive April 08, 2016 10:16PM |
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Re: Z Axis Belt drive April 09, 2016 02:52AM |
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Re: Z Axis Belt drive April 09, 2016 04:08AM |
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Re: Z Axis Belt drive April 09, 2016 04:13AM |
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Dust
a m5 based z axis with 1/16th drivers and 1.8 degree steppers is 4000 steps per mm ie 1 step is 1/4000 ie 0.00025 mm/step
re belt stretch, im meaning over time.. not just one print... you need something to be adjustable to re tighten it
Re: Z Axis Belt drive April 09, 2016 04:22AM |
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Re: Z Axis Belt drive April 09, 2016 04:53AM |
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Re: Z Axis Belt drive April 09, 2016 10:25AM |
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MKSA
BTW, idler pulleys MUST be toothed when inside the belt ! An smooth pulley will crush the rubber tooth and leads to unreliable tension and wear.
Re: Z Axis Belt drive April 09, 2016 01:27PM |
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dc42
Check out theCoreXYCoreXZ design, it uses belts to drive and support the Z axis.
Z resolution on deltas is typically 0.0125um or 0.01um per microstep, which turns out to be sufficient. You can double it by using 0.9deg/step motors.
Re: Z Axis Belt drive April 09, 2016 01:38PM |
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Re: Z Axis Belt drive April 09, 2016 05:07PM |
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Re: Z Axis Belt drive April 09, 2016 05:57PM |
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Re: Z Axis Belt drive April 10, 2016 03:27AM |
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Koko76
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MKSA
BTW, idler pulleys MUST be toothed when inside the belt ! An smooth pulley will crush the rubber tooth and leads to unreliable tension and wear.
That's not what the applications manual at SDP-SI says. They call out a minimum diameter for non toothed internal idlers, I want to say a 40t equivalent diameter.
Re: Z Axis Belt drive April 10, 2016 05:17AM |
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Re: Z Axis Belt drive April 10, 2016 06:04AM |
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Re: Z Axis Belt drive April 10, 2016 07:06AM |
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Re: Z Axis Belt drive April 10, 2016 01:38PM |
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Re: Z Axis Belt drive April 10, 2016 05:37PM |
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Re: Z Axis Belt drive April 13, 2016 04:40AM |
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DjDemonD
Having said of this I'm concluding that in a direct comparison of delta, corexy and regular cartesian printers the delta comes out on top for various reasons, as long as you can build and calibrate it correctly.
David are think3dprint3d doing those beta large kossel kits? I think that's what I'd move towards next?
Re: Z Axis Belt drive April 13, 2016 04:44AM |
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Re: Z Axis Belt drive April 13, 2016 04:46AM |
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Edvardas
At the end of this thread you can read my experience of belt driven z-axis: [forums.reprap.org]
I could also add that I have experienced a few milimeters of belt stretch after a few kilograms of plastic printed. I hope it is just an initial stretch and belt will stay at where it is at now.
Another conclusion I have made in my head is that both screw and belt driven z-axis can deliver great results or be a disaster. It is all a matter of approach and design solutions that are done. Properly mounted screw will work great as will a belt driven driven z-axis with proper pulleys and stiff parts.