Ideas on keeping a part from slipping
Ideas on keeping a part from slipping
(OP)
Hi everyone,
I've been working on a project and have built a simple prototype for a proof of concept. The concept worked, but now I need to find a way to revise it because I have a constraint that the curved frame CANNOT slide. Obviously right now it slides quite a bit, since the aluminum curved frame is just rocking on the aluminum guide, with a small force being exerted on it via the rollers.
I thought about installing a guide that matches the profile of the motion of the frame, but would like to consider other options if available. Also, I cannot use any type of urethane because I cannot have vertical motion due to the urethane material softness.
Attached are a picture of the prototype and the profile motion that think it follows.
http://i54.tinypic.com/29e3i53.jpg
I've been working on a project and have built a simple prototype for a proof of concept. The concept worked, but now I need to find a way to revise it because I have a constraint that the curved frame CANNOT slide. Obviously right now it slides quite a bit, since the aluminum curved frame is just rocking on the aluminum guide, with a small force being exerted on it via the rollers.
I thought about installing a guide that matches the profile of the motion of the frame, but would like to consider other options if available. Also, I cannot use any type of urethane because I cannot have vertical motion due to the urethane material softness.
Attached are a picture of the prototype and the profile motion that think it follows.
http://i54.tinypic.com/29e3i53.jpg





RE: Ideas on keeping a part from slipping
put a series of pins and slots (like really coarse teeth)
the guide, as you mentioned, may be a curved vertical-ish slot with a follower on the rocking part
RE: Ideas on keeping a part from slipping
RE: Ideas on keeping a part from slipping
(Or instead of radiusing the frame itself, bolt on radiused "ears".)
I'm assuming you're talking about sliding in the direction aligned with the belts.
P.S. I guess you wouldn't have to use rollers, you could use straight bars that the radiused ends slid along. If you can live with the sliding friction.
RE: Ideas on keeping a part from slipping
This only constrains in one direction so a second is required in opposite direction.
Picture a drum rolling on the ground with a rope looped around circumference and running on ground. Fix rope to drum circumference at a point and anchor both ends of rope. Drum is free to roll but cannot slide.
Problem is ties cannot be co-linear and two will induce turning force in rocking member.
Solution: Two ties one side, opposite tie running in between.
RE: Ideas on keeping a part from slipping
you are the "intelligent designer" so this machine so you can make it do what you want.
is one end fixed ? is there a point of rotation ? a single pin in a hole/slot could work.
how much force would this have to react ?? conditions (heat, ...) ??
maybe a roller at the far end (so there's no free space along the the curved frame, but the end can still move vertically)
maybe both a pin (to contrain a center) and a roller (to giude the motion) ??
RE: Ideas on keeping a part from slipping