Anyone have any tips to reduce play in the J3 joint? With the robot on and the motors energized I can manually move the J3 joint at least 5 degrees or so. Did I maybe not tighten the bearing set screws enough? I'm not entirely sure how much is due to the sprockets slipping a bit on the shafts and how much is due the motor gearbox itself.
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i just got done adressing this, what i did was deep seat one of the set screws so it acts like a shear pin: with the sprocket in the final position take the tap drill and drill through one of the set screw holes .100 deep into the shaft. then insert a longer set screw in the hole and tighten down. the screw will act like a key and prevent the shaft from turning. note: i did not use the 8mm keyed shaft called for, i just used a peice of 5/16 stainless steel with a flat filed in for the set screws and the sprocket screw deep seated.
That's a great idea, thanks!