5
General Robot Assembly notes:
• Use medium strength thread locker on all screws.
• All belts and chains should be tensioned using moderate tension (do not over tighten or
stress belts and chain).
Tools Needed:
• General hand tools including metric hex key set, locking pliers, wire cutters, wire
strippers.
• Wire ferrule crimpers and wire ferrules.
• Soldering Iron and flux core silver bearing solder.
• Heat gun or lighter for shrink tubing
• 3D printer and printer filament.
• Various size drill bits for clearing holes in 3D printed components.
• M3, M4, M6 and M8 taps for threading plastic components.
• Epoxy is used for the J6 limit switch tip. Epoxy is also used in some areas of the robot
assembly when using 3D printed components.
Bearing Fit:
The CAD models for the AR2 robot are sized for a slight press fit on all bearing and race
diameters. The assembly steps in this manual also reference pressing the bearings and races
in place. Given customer feedback and the fact that most don’t have access to a quality
bearing press or hardware I have tried to make sure the aluminum kits offered are closer
to a slip fit. If bearings get improperly wedged or tilted and then attempt to press, severe
damage can occur. Given the opportunity for bearings to jam and permanently damage to
occur I have opted to try and provide kits that error on the side of a looser fit to avoid
part damage and frustration. If the tolerance stack up on your components results in a
race that is slightly loose please use a small strip of shim stock or wax paper to alleviate
any movement. A small dab of epoxy can also be used.
The bearing oil that comes on bearings should be sufficient lubrication given the low
speed and pressure of the robot joints. If additional lubrication is needed a very small
about of white lithium grease is recommended.
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