Sarrus Linkage Linear Bearing

by fdavies, published

Sarrus Linkage Linear Bearing by fdavies Jun 7, 2009

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Sarrus linkage linear bearing

This is an implementation of the Sarrus linkage that may be useful for reprap type machines. It is made from ABS printed on my repstrap, with 1/16" (1.6 mm) brass rods for the hinge pins and 4-40 screws to hold the spine sections together. The hinge pin holes were chased with a 1/16 drill bit, and the screw holes with a 1/8" bit. The two ends are made of one center block cut in half with a saw, and there are some other holes that were drilled rather than printed.

It has a total swing of 100 mm. This is set by the length of the spine, and could easily be 110 mm. It moves very smoothly, and was stiffer than I thought it would be. The center block only moves down about 0.2mm with a 460 gram payload. Interestingly the droop is about the same over the whole range of motion. It stays well within 0.2mm of a straight line as it moves.

A payload (extruder?) could mount on the central block, which could be widened.

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Just wondering, what keeps the center block from getting stuck on those brackets used to attach the spine blocks together?

Shouldnt you put the screws on the inside instead and make the spine about the same size as the hole in the block so that it slides accuratly?

The swing arms constrain the motion so the center block doesn't touch the center brackets.

Can't wait till I can experiment with making a minimum mass version, nor can I wait till details are released for the =-X you've been working on.

This is a very cool design, It could potentially eliminate one more specialty part that the rep-rap needs to be purchased. I hope some one seriously considers making a version of the rep-rap with this linear slide.

Good work.

WOW! We are really getting some
Serious designs
on this site now!

Dude, that looks amazing! Very cool design and also great prints! I like the fact that it's modular. You could probably make this in different sizes to fit the needs of a particular project.
Drilling out holes is not really a problem. They will come out better when drilled. It's great if you know exactly where to drill though, but in this design you'll be able see that easily.
This type of linear bearing may what increases the RepRap's fraction of self-replication.