mjbots quad A0

[jwatte]

Looking forward to it!

You should post it in https://forum.mechwarfare.org/c/builds/6 -- it'll give you a badge ;-)

[jpieper]

More videozzzz:

[KevinO]

I love this.

[tician]

Any thoughts on combining two of the servos onto a differential similar to this to make the two-axis joints a bit more compact/robust? I'm thinking more or less a U-shaped bracket with a hard-mount on the base of the U and one servo mounted outside each leg-end with a differential sandwiched/supported between them. Only the horn on the output gear of the differential would be supporting a cantilevered load instead both servo bodies supporting serially connected cantilevered loads.

[jpieper]

I actually had a design nearly exactly like that:

https://jpieper.com/2019/05/22/resul...er-faire-2019/

I switched away because I couldn't figure out a way to build one that was suitable for 3d printing.

https://jpieper.com/2019/05/27/full-...on-leg-design/

[tician]

Not quite what I was thinking of...

Cannot get image upload as attachment to work right now and getting a mysql error trying to access settings to add an image, but it is literally a U-bracket with two servos mounted to it driving the 'wheels' of a four-gear differential (in a car, it would basically be using the wheels to rotate the body up/down off the ground and control the drive shaft direction). Both servos rotating in same direction moves one axis; servos rotating in opposite directions rotates other (orthogonal) axis. The entire differential can be supported by bigger bearings in the U-bracket than the servos require and the output shaft of the differential can extend through a bearing in the opposite gear to add extra support against the cantilevered load.

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