Atfer Hbot, go to CoreXY.
Posted by zelogik
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Re: Atfer Hbot, go to CoreXY. October 10, 2014 10:57AM |
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misan
@marcossf your z-axis rods should be aligned with bearing axis for best performance.
It's modified again, but Z axis doesn't need such high performance. It have 2 linear rails from Igus, two drylin 40mm sliders on each guide. There isn't sag on it, and goes up/down nicely. I'm going to change the Z stteper to 1/16 (now 1/32 seem to much resolution for Z axys) and gain a little speed without loss of the perceived print quality.
I'll keep improving it anyhow.
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Re: Atfer Hbot, go to CoreXY. October 10, 2014 03:19PM |
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brucehvn
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cfeniak
Well, after H-bot.... I went core XY! Should of heeded the warnings
Here is my build:
Core XY on Open Builds
You can see a picture of my original H-Bot in the discussion forum.
Hard to tell from the photos, but could you elaborate on how the z-axis is constructed? I see the two motors with the 8mm threaded rod (are these OpenBuilds leadscrews?) on one side. Is the other side of the platform supported at all or is it only supported on the one side. I'm designing my own core x/y right now which will also use v-slot exclusively for the linear motion. I'm kicking around various ideas on how to handle the z-axis and whether one supported on just one side with the v-wheels will work effectively.
The bed is only supported on the rear side. It is supported with two lead screws vertically and also provides left right stability. There are eight v-wheels (4 per side) supporting the bed in a front to back manner. Of the 8, 4 carry all the weight and the other 4 provide preload and stability during Z lifts (bed drops).
I have found my bed setup to be very stable and am happy with it. I sourced my led screws from Ebay, but that was before open builds carried them. The open builds ones are actually a better deal.
Edited 2 time(s). Last edit at 10/10/2014 03:22PM by cfeniak.
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Re: Atfer Hbot, go to CoreXY. October 14, 2014 07:32AM |
Ah!
Ok. My mistake, sorry
Spanish: Misan, no cogí lo que querías decirme. La "resolución" de 6400 pasos por vuelta con 1/32 es correcto.
Ok. My mistake, sorry
Spanish: Misan, no cogí lo que querías decirme. La "resolución" de 6400 pasos por vuelta con 1/32 es correcto.
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Re: Atfer Hbot, go to CoreXY. October 14, 2014 08:10AM |
No worries. Among the two we have covered the details of the math for others to see 
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Re: Atfer Hbot, go to CoreXY. October 16, 2014 12:32PM |
Damn Pololus!! they die so easily 
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Re: Atfer Hbot, go to CoreXY. October 16, 2014 02:19PM |
another problem occurred .. 
after i homing the printer i didn't get any further moves from my printer ... any ideas?
after i homing the printer i didn't get any further moves from my printer ... any ideas?
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Re: Atfer Hbot, go to CoreXY. October 16, 2014 05:10PM |
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pelo13
another problem occurred ..
Maybe your endstop shorted something when it hit home? Is that possible?
http://www.marinusdebeer.nl/
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Re: Atfer Hbot, go to CoreXY. December 15, 2014 08:28PM |
I am looking at the all aluminum design that zelogik first posted. I am trying to get a clear understanding of the belt drive assemblies. I included my understanding of these assemblies below.
1) Does this look drawing look correct?
2) I understand the pulley P1 should be a GT2 20T with a 5mm bore, correct?
3) Are the bolts that go through the spacers marked in blue also used to connect to the T-nuts in the aluminum extrusions? It would appear that they did.
4) Are there any clear diagrams of the belt tension assembly? I see that aluminum channel is used but I haven't figured that one out.
5) Are the left and right side assemblies just mirrors of each other or are the pulley heights reversed (i.e. stepper and front pully lower on the right)?
Also, I haven't been able to find any clear pictures of the construction. Has anyone done this yet?
1) Does this look drawing look correct?
2) I understand the pulley P1 should be a GT2 20T with a 5mm bore, correct?
3) Are the bolts that go through the spacers marked in blue also used to connect to the T-nuts in the aluminum extrusions? It would appear that they did.
4) Are there any clear diagrams of the belt tension assembly? I see that aluminum channel is used but I haven't figured that one out.
5) Are the left and right side assemblies just mirrors of each other or are the pulley heights reversed (i.e. stepper and front pully lower on the right)?
Also, I haven't been able to find any clear pictures of the construction. Has anyone done this yet?
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