Re: No-leadscrew, single-motor, precision Z-axis design April 30, 2018 05:15PM |
Registered: 8 years ago Posts: 28 |
Re: No-leadscrew, single-motor, precision Z-axis design April 30, 2018 06:04PM |
Registered: 10 years ago Posts: 564 |
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]
Re: No-leadscrew, single-motor, precision Z-axis design April 30, 2018 07:05PM |
Registered: 7 years ago Posts: 507 |
Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 01:30AM |
Registered: 8 years ago Posts: 5,232 |
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.
Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 01:45AM |
Registered: 8 years ago Posts: 5,232 |
Yes "zero" is adjustable now. I could've tried to make them without rubberbands, but wanted a quick result. One fixed length and one adjustable line would work, too. There are ways to adjust the line without any springiness.Quote
golfwolf
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?
Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 01:50AM |
Registered: 8 years ago Posts: 5,232 |
Quote
Trakyan
My only problem with this mechanism seems like it could deflect fairly easily perpendicular to the axis of travel (translation, not twisting) since the only thing stopping this is tension,
Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 03:08AM |
Registered: 7 years ago Posts: 507 |
Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 06:29AM |
Registered: 8 years ago Posts: 5,232 |
The whole installation with all the wheels and so on will constrain the bed to one DOF, but each part shouldn't add "involuntary" constraints to avoid binding and alignment problems.Quote
Trakyan
From what I understand is it is supposed to be constrain TO one degree of travel, not IN one degree of travel.
Re: No-leadscrew, single-motor, precision Z-axis design May 01, 2018 10:13PM |
Registered: 7 years ago Posts: 507 |
Re: No-leadscrew, single-motor, precision Z-axis design May 02, 2018 02:28PM |
Registered: 8 years ago Posts: 28 |
Re: No-leadscrew, single-motor, precision Z-axis design May 02, 2018 09:36PM |
Registered: 7 years ago Posts: 507 |
Re: No-leadscrew, single-motor, precision Z-axis design May 03, 2018 01:30AM |
Registered: 8 years ago Posts: 5,232 |
Re: No-leadscrew, single-motor, precision Z-axis design May 03, 2018 06:17AM |
Registered: 7 years ago Posts: 507 |
Re: No-leadscrew, single-motor, precision Z-axis design May 04, 2018 05:56AM |
Registered: 12 years ago Posts: 1,450 |
Re: No-leadscrew, single-motor, precision Z-axis design May 04, 2018 06:13AM |
Registered: 8 years ago Posts: 28 |
Re: No-leadscrew, single-motor, precision Z-axis design May 04, 2018 07:10AM |
Registered: 12 years ago Posts: 1,450 |
Re: No-leadscrew, single-motor, precision Z-axis design May 04, 2018 10:49AM |
Registered: 6 years ago Posts: 1,007 |
Quote
leadinglights
Any attempt to download any of the books on this are met wit the message:-
ACCESS TO THE WEBSITES LISTED ON THIS PAGE HAS BEEN BLOCKED PURSUANT TO ORDERS OF THE HIGH COURT
I am not sure that I would like to steal a copy of the book but equally I am disappointed that the author does not make the book available freely for non-commercial use. If I get some time I may visit a university library to read it.
Mike
Re: No-leadscrew, single-motor, precision Z-axis design May 04, 2018 12:11PM |
Registered: 11 years ago Posts: 335 |
Re: No-leadscrew, single-motor, precision Z-axis design May 04, 2018 05:14PM |
Registered: 8 years ago Posts: 28 |
Quote
leadinglights
Any attempt to download any of the books on this are met wit the message:-
ACCESS TO THE WEBSITES LISTED ON THIS PAGE HAS BEEN BLOCKED PURSUANT TO ORDERS OF THE HIGH COURT
I am not sure that I would like to steal a copy of the book but equally I am disappointed that the author does not make the book available freely for non-commercial use. If I get some time I may visit a university library to read it.
Mike
Re: No-leadscrew, single-motor, precision Z-axis design May 05, 2018 05:43AM |
Registered: 8 years ago Posts: 1,671 |
Re: No-leadscrew, single-motor, precision Z-axis design May 06, 2018 07:01AM |
Registered: 8 years ago Posts: 28 |
Re: No-leadscrew, single-motor, precision Z-axis design May 06, 2018 07:53AM |
Registered: 8 years ago Posts: 1,671 |