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billyzelsnack
11-08-2008, 10:32 PM
You know.. the pivot you put on the opposite side of servo horn for your brackets to swing on?

What are people doing here? I'm going with double 6mm inner ( 10mm outer ) flanged bearings sitting on a 6mm bolt, bolted to a 0.064mm aluminum replacement for the servo back plate. Seems a bit excessive, but I want it to help with the load vs just keep the pivot in place.

I've looked at the lynxmotion stuff. Their stuff looks very sturdy, but also very heavy. I'm trying to keep my brackets to the minimum.

lnxfergy
11-09-2008, 12:18 AM
Something like this maybe help:

http://www.lynxmotion.com/Product.aspx?productID=150&CategoryID=87

-Fergs

jes1510
11-09-2008, 12:40 AM
I am working on a small robot and I needed to find exactly the same thing. I went to home depot and bought a package of the little brackets that hold a shelf inside a bookcase. I trimmed it down and used double sided tape to hold it to the back of the servo. The result is very similar to the link posted above. The whole thing cost around $2 and I have enough to make a few hinges.

billyzelsnack
11-09-2008, 01:01 AM
Inxfergy. I'm using 805bb's which are ginormous and lynxmotion doesn't carry one big enough. I'm also worried that the way they do it acts more as a guide rather than a load bearing pivot.

jes1510. I think I know exactly what you are talking about. How's the weight?

Here's mine so far minus the aluminum backing..
http://www.flickr.com/photos/[email protected]/3015184916/

Assembled as..

Locking nut.
Servo backing
Thin washer
Flange bearing
Servo horn
Flange bearing
Bolt

After putting this together I might be able to get away without the aluminum servo backing. The pivot is quite solid and the horn rotates smoothly without slop. Minus the horn it weighs about 10g. More than I was looking for, but not bad. I have another servo configuration ( think two servos cut into L shapes and merged together ) that's a bit more tricky as there is no room for the nut to hold it on.

btw. The only reason I have room to do this is that my motor driver is going to be located outside of the servo box. I'm going to put them all in one place with some nice active cooling.

Here's the tricky one..

http://www.flickr.com/photos/[email protected]/3015216008/

As for cost.. I ordered the bearings for $1 a piece off the inet. The metric bolt + nut cost $1.20 at the local hardware store. I'll of course order those once I know what I'm building.