No-leadscrew, single-motor, precision Z-axis design
Posted by golfwolf
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Re: No-leadscrew, single-motor, precision Z-axis design April 30, 2018 05:15PM |
That is badddd asssss! With the fishing line tensioned with rubber bands it must let it have adjustable 'zeroes', avoiding the problem of overconstraint in the 4/17 post. Out of curiosity, without the rubber bands, are there hard 'zeroes', and does it fall down freely w/o the bands?
I'm definitely gonna build this mechanism now. It's climbing up the project roster, faster than an over-counterweighted carriage
I'm definitely gonna build this mechanism now. It's climbing up the project roster, faster than an over-counterweighted carriage
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Re: No-leadscrew, single-motor, precision Z-axis design April 30, 2018 06:04PM |
Quote
o_lampe
I made a short demo video about how the fishing line dual roller constrains the horizontal movement. The lines were tensioned by rubberband and as long as the tilting force is lower than the rubbers tension it stays horizontal.
I almost felt like David Copperfield, when I lifted the extrusion with two fingers
[attachment 104682 dual_roller_constraint.JPG]
Looks like a drafting parallel bar. I used one of them for years.
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Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 01:30AM |
Quote
LoboCNC
Quote
o_lampe
I made a short demo video about how the fishing line dual roller constrains the horizontal movement. The lines were tensioned by rubberband and as long as the tilting force is lower than the rubbers tension it stays horizontal.
I almost felt like David Copperfield, when I lifted the extrusion with two fingers
[attachment 104682 dual_roller_constraint.JPG]
Looks like a drafting parallel bar. I used one of them for years.
See the drawing on page 1. The author wants to use only one line per side. We discussed the common approach of using two lines and my vid was the demo of this arangement.
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Re: No-leadscrew, single-motor, precision Z-axis design May 03, 2018 01:30AM |
@Trakyan
The wheels are responsible to deal with these forces. Not the fishing line.
The wheels are responsible to deal with these forces. Not the fishing line.
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Re: No-leadscrew, single-motor, precision Z-axis design May 05, 2018 05:43AM |
I think I may have an idea for Z without metal leadscrews
I've been making this for a lens assembly, but with a little modification maybe it could be used for Z elevators,
it sits on another tube with vertical slots, and another inside that that would rise or fall though which parts rise n fall depends on assembly, pins extending from the inner tube into the grooves, so when this ring spins...maybe an improved version with bearings, or a rise & fall platform with one central column base underneath....might need large hole in work surface or printer base, or maybe another orientation could solve that. Center piece could also be used to pull string.
Edited 2 time(s). Last edit at 05/05/2018 12:39PM by MechaBits.
I've been making this for a lens assembly, but with a little modification maybe it could be used for Z elevators,
it sits on another tube with vertical slots, and another inside that that would rise or fall though which parts rise n fall depends on assembly, pins extending from the inner tube into the grooves, so when this ring spins...maybe an improved version with bearings, or a rise & fall platform with one central column base underneath....might need large hole in work surface or printer base, or maybe another orientation could solve that. Center piece could also be used to pull string.
Edited 2 time(s). Last edit at 05/05/2018 12:39PM by MechaBits.
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