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Allow line end to slide along another line (by Ron Aronica)
I am new to SolveSpace and am trying to design a linkage with a sliding component. The end of one rod slides (with a coupling) along the length of another rod. One end of the rod on which the other slides pivots at a fixed point. Can I model this in SolveSpace, and if so, how? If not, what other application might allow me to do this? Thanks in advance for any help.
(no subject) (by Rune)
Hi Ron, I have done something similar with success. I had to make an arrangement of arcs to simulate an interval constraint which gives you some points of no solution that you must fix manually.
(no subject) (by Jonathan Westhues)
Can you post a sketch of the linkage? And have you completed the linkage tutorial,
http://solvespace.com/linkage.pl ?
In general, it's pretty straightforward--a line constrained to a specified length is a link, a point-coincident constraint is a pin joint, and a point-on-line constraint is a slide.
SolveSpace isn't designed for interval constraints, and attempts to fudge that are unlikely to be very satisfying. That's not generally necessary to simulate a linkage, though.
http://solvespace.com/linkage.pl ?
In general, it's pretty straightforward--a line constrained to a specified length is a link, a point-coincident constraint is a pin joint, and a point-on-line constraint is a slide.
SolveSpace isn't designed for interval constraints, and attempts to fudge that are unlikely to be very satisfying. That's not generally necessary to simulate a linkage, though.
(no subject) (by Ron Aronica)
Ah ha! I didn't realize that a point-on-a-line constraint is a slide. I thought that it fixed the point to the line. I will study it tomorrow, but it appears that it should do what I need. Thanks for the help Rune and Jonathan.
Practical example (by Rune)
For a linkage it might be relevant to constrain it to an interval, say to model something sliding in a groove.
I have realized this by constraining to a circle as in the attached example.
Two levers (red) can act on a linkage fixed in a grove (white)
Each one is attached to the groove by a point-on-line constraint.
They can be moved by sliding the blue handle horizontally.
The upper linkage can slide off the endpoints of the grove since since the point-on-line constraints does not take the endpoints of the line into account.
The lower linkage is furthermore constraint to be horizontal with a point constraint to lie on the circle, which models the physical reality.
I have realized this by constraining to a circle as in the attached example.
Two levers (red) can act on a linkage fixed in a grove (white)
Each one is attached to the groove by a point-on-line constraint.
They can be moved by sliding the blue handle horizontally.
The upper linkage can slide off the endpoints of the grove since since the point-on-line constraints does not take the endpoints of the line into account.
The lower linkage is furthermore constraint to be horizontal with a point constraint to lie on the circle, which models the physical reality.
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