Replies to This Discussion

3D RoboticsPermalink Reply by Joshua Ott on March 28, 2013 at 10:47pm

Heat is often a useful tool for removing a pressed in shaft. The motor bell (can) is aluminum, which will absorb heat quickly, and expands at a higher rate than the steel shaft. 

(Edit) Remember that the magnets are glued to the motor bell, too much heat will damage the glue and the magnets!!

Keep it well under 80C/176F!

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Permalink Reply by Ken McCann on March 29, 2013 at 1:01pm

JDrones also carries these shafts.  Here is their description: "If you have bend your shaft due collision, here is replacement shaft. You need to have oilpress or similar to push new shaft on it's place."

Seems like a pain in the arse to replace this shaft.  Has anyone actually done it before?

http://store.jdrones.com/AC2830_358_Replacement_p/ac2830358shaft.htm

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Permalink Reply by Coty Wood on March 29, 2013 at 1:09pm

Cool...I did not realize jDrones have them (of course they are out of stock at the moment ;-)

Replacement is super-simple.  Remove the clip from the bottom, pull the upper motor housing up/off with the shaft attached.  Then loosen the grub screw on the upper motor housing and pull the shaft out (sometimes you gotta rap it with authority to get it to let go).  Installation is the reverse :-)  I have changed 3 now and no press was needed...

Note:  Pulling the shaft up/out keeps the bent part from going through anything.

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Permalink Reply by Ken McCann on March 29, 2013 at 1:22pm

Oh nice.  I didn't even realize there was a grub screw.  So are you saying if the shaft is bent, it is difficult to remove?  What did you do in your case?

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Permalink Reply by Coty Wood on April 12, 2013 at 8:26pm

If the shaft is bent most likely (I would hope!) it is bent above where it enters the housing leaving the part inside straight.  Pull out/towards the bent part vs trying to drag the bent part all the way through the motor/housing.

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3D RoboticsPermalink Reply by Joshua Ott on March 29, 2013 at 1:19pm

You can use a bench-top vise and a large socket as an anvil, if you don't have access to an arbor press. Chill the new shaft on dry-ice and heat up the motor bell before you re-assemble, the temp differential makes a lot of difference in the ease of pressing.

(Edit) Remember that the magnets are glued to the motor bell, too much heat will damage the glue and the magnets!!

Keep it well under 80C/176F!

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Permalink Reply by Ken McCann on March 29, 2013 at 1:46pm

Quite helpful.  Thanks.

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