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Linear Actuator

by TrinityLabs, published

Linear Actuator by TrinityLabs Oct 31, 2012
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A self contained linear motion component we've been playing with.


Instructions are incomplete, because this is just a prototype, but it should be pretty self-explanitory if you open up the model.

It isn't perfect, but it's coming along.

Intended to use SDP-SI A 7Z 7-031 thrust bearing at either end (or other size appropriate to your lead screw)

This is still an early beta. There is a proof of concept here: http://brainspl.at/leadscrew-actuator/index.html

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What motor did you use?

Just a thought you might want to look and see what the CNC guys thing about using thrust control on either side of the rod. typically its bad because the rod can not expand as it heats up.. normally a double thrust bearing at the drive side then just a radial bearing that the shaft can float in on the non driven side.

So do they spring load the bearings on one side?

i dont understand why they would spring load? they do preload is they are using angular contact bearings for thrust control. one side has a double thrus bearing or two angular contact bearings so it can take thrust in both the positive and negative directions relative to its axis the other side (non driven) just "slip fits" thru a radial bearing that was there is no restraint in the plus minus direction. keeps the shaft turning true but eliminates binding due to expansion. also precision rod is a must when double supporting. the X axis on both my lathes are only supported on the "driven" side. (manual lathes) CNC zone is a wealth of info on CNC setups.

Which coupler from the motor shaft to the leadscrew do you recommend?

I used some similar to these: http://www.ebay.com/sch/i.html?_odkw=couplers&_sop=15&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313&_nkw=5mm+couplers&_sacat=0http://www.ebay.com/sch/i.html...  Printed ones should work too, just use ones appropriately sized to your motor shaft and leadscrew.

I ran across this design not to long ago on a website where they were building lots of different machines (including a delta) using the same actuator connected in different configurations. Built a few of my own to mess with.

Enlarged the coupler region in the motor mount to make more room for large couplers.  Updated Actuator motor mount.stl and the .skp

This is really cool!  End stops would be a nice to have, too.

About the endstops, I suspect that is a part of this model that needs work - right now they aren't really adjustable.  I'll try to give it some thought, but I'm certainly open to suggestions.

That's lovely, but could you change the license to something that complies with the Open Source Hardware Definition (e.g. CC-BY, CC-BY-SA or GPL)? If this was truly open source, it would be even better...

Sure, looks like a toss up between CC-BY-SA and GPL, both seem to specify the same thing - if I'm mistaken, can you clarify CC-BY-SA vs GPL for me?

Thanks :)

Interesting to note that "BY" is automatically assumed anymore, so they just call it "CC-SA" because all of the CC licenses assume you will give attribution.  I didn't know that until just now.