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This table showcases all bearings used including their dimensions and inset. Inset for ball bearings have a clearance fit with minor difference in diameter, additionally crush ribs are used to provide a better grip on ball bearings, a feature script in the pib CAD document does this automatically
Name | Dimensions | Inset dimensions | Use of crush ribs |
|---|---|---|---|
M07-Thrust_bearing_70x50x1 | 70x50x1 | Place in central rotator with no inset | ❌ |
M06-Ballbearing_Axial_70x50x3 | 70x50x3 | Place in central rotator with no inset | ❌ |
M04-Ballbearing_60x78x10 | 60x78x10 | 78.4 | ✅ |
M05-Thrust_bearing_95x70x6 | 95x70x6 | N/A | ❌ |
M01-Ballbearing_2x5x2.3 | 2x5x2.3 | 5.1 | ✅ |
M03-Ballbearing_10x19x7 | 10x19x7 | 19.2 | ✅ |
Using small bearings with rods
The default clearance fit value used around Pib is 0.1 mm while interference fit is -0.1 mm, this is used with connecting metal rods that are sometimes used as fixed axis which needs a 1.9mm hole (interference fit) and sometimes used as rotating axis which needs a 2.1mm holes (clearance fit).
Minimum wall thickness = 1mm
Usually, the layer height used in most print jobs are 0.2 or 0.3mms, this should make walls above 0.6mm theoretically possible. However, from some failed experiments any wall thinner than 1mm either falls to print or is very week and breaks by hand