QU-BD Revolution XL Speed Test 9000mm/s Accel @ 1000mm/s

mrc Wrote:
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> yes its a really fast machine, but it better
> should be.
> At least it got a Single Extruder transported by 2
> Motors on X Axis and 2 Motors on Y Axis.
> But how do you sync the Stepper? Every Stepper has
> tolerances,
> how did you guys eliminated them?

If every once in a while only one stepper steps and the other slips, the belt would still move the prescribed amount.

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[www.matter-replicator.com]

They designed it to hold four extruders side by side and back to back.

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[www.matter-replicator.com]

@rsilvers, have you taken over PR for QUBD or something?

rsilvers Wrote:
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> If every once in a while only one stepper steps
> and the other slips, the belt would still move the
> prescribed amount.

you may be right for the X Axis, because both motors driving the same Belt,
but im not so sure about the Y Axis. With such a portal build every Engineer
would advise against a setup with two Motors here.

PS: its not just a missing Step wich causes the Problems. Most Sepper motors
got 5-10% position inaccuracy per Step, thats what causes the Problems.

Edited 1 time(s). Last edit at 05/21/2013 12:10PM by mrc.

Quote

PS: its not just a missing Step wich causes the Problems. Most Sepper motors
got 5-10% position inaccuracy per Step, thats what causes the Problems.

While this maybe true, it doesn't accumulate, if it can run one complete revolution without issues, positional accuracy will never be an issue.
Given this is exactly how the Z axis on the majority of repraps work I can't see it being an issue.

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My blog [3dprinterhell.blogspot.com]

Hi Chelsea - QU-BD

I've been using one of your "MBE Extruder v9" Single head extruders on an Ordbot Hadron. The only major thing I found deficient in the extruder was the temperature control between the hot and cold end when printing long runs of ABS. Thermal management and hot end chamber seems to be critical to a well designed feeder according to a number of sources. I was about to junk the V9 in spite of it's otherwise straigt forward and reasonably reliable design, when I saw an article about using a high temp teflon insert in the feed tube as insulation. I had my machinest machiest make me up a couple of modified feed tubes (see attached pdf's) and have now have no trouble printing long ABS runs. The teflon insert insulates the cold end nicely preventing unwanted premelt above the heat end melt chamber.

Enjoy.

Kent.