I’ve been on a quest for the last week or so to collect ways that people deal with the “servo support” problem when it comes to making a servo-driven joint — you know, how you provide a pivot point on the bottom side since the output shaft doesn’t go all the way through.
I knew about the SEC brackets, but just today I happened to be browsing the catalog and stumbled across this:
My eyes just about fell out of my head. This looks fantastic! I have an inclination to make my own connecting brackets, and it looks like with this, I could do it and (in theory) make something about as streamlined as a Robonova or those custom Robo-One bots all the kids are building in Japan.
But the description of this product only leaves me with more questions:
How exactly does this attach to the servo? It kind of looks like double-sided tape in the photo, but I’m not sure. If so, how secure is that?
In what way is it a “hinge”? It looks more like a shaft to me. Have I missed something?
What sort of shaft is that? It doesn’t look round in the photo; maybe cross-shaped, like a LEGO axel? Or is that a trick of the light? Specs would be appreciated.
Related to #3, how exactly would I affix a custom bracket to that shaft? Can I screw a retaining bolt into the end, or what?
An interesting thing about Lynxmotion is every part we use, or for the most part have ever used, in a robot kit is made available seperately to the do-it-yourselfer. That part was used in the arms until we made the longer “heavy duty” ones. It is a 0.125" stud that is directly in line with the servos final gear (horn). It can be used with plates separated by a a 1-7/8" standoff to make the equivelent of a “C” bracket. We also sell the 1-7/8" aluminum standoffs. The use of it is illustrated in some older assembly guides that we retain on the website. Here is the old version of the L5 arm that used this part. lynxmotion.com/images/html/build015.htm
Here is an old assembly guide for the matching gripper showing the standoffs in use, but at the time it was made from a 1-1/2" and a 3/8" standoff, but you should be able to get the idea. lynxmotion.com/images/html/build014.htm
We try to provide examples for the use of every part, well we do the best we can anyway. You may want to browse the assembly guides and tutorials as much useful information can be found there. lynxmotion.com/ViewPage.aspx … egoryID=19
Thanks very much for the answers. I hope you keep selling these parts, even if you are favoring the multi-purpose bracket in newer models — they’re probably not as strong, but they sure are sleek.
I plan to add some to my next order, and if I ever build anything cool out of them (as time and budget permit), I’ll send pictures.
I just got my first set of PSH-04 (servo hinge for ball bearing) and BB-03 (ball bearing with flange). But it’s not clear to me how the ball bearings are supposed to be attached to the servo hinge, and I can’t find any examples in the assembly guides. This page shows attaching ball bearings to a multi-purpose bracket, with a 3 mm lock washer in between. Do I need that when attaching to the servo hinge as well? Is there yet an example (with instructions) of the use of this part?