Specs

material Aluminum
length 25mm
outer diameter 20mm
inner diameters 5mm and 8mm
screw material Stainless steel
screw drive size 2mm hex
Price $6.00
Quantity Genesis - 1
Genesis XL - 1
CAD model Onshape
Purchase The FarmBot Shop
internal-part-name Shaft Coupler - 5mm to 8mm
cost $1.85
notes v1.5 Production Run 2 and v1.6 Production Run 1 screws had 2.5mm drive instead of 2mm, requiring an extra allen key to be added to the kit. Screws must be stainless steel and have 2mm hex drive.

Component tests

Test Description Target Tolerance
Inner diameters Measure using digital calipers. 5mm and 8mm +/- 0.05mm
Motor shaft fit Connect the coupling to a motor shaft. The coupling should be easy to connect and resist pulling off by hand once tightened. N/A
Leadscrew fit Connect the coupling to a leadscrew. The coupling should be easy to connect and resist pulling off by hand once tightened. N/A
Outer diameter Measure using digital calipers. 18mm +/- 0.5mm
Length Measure using digital calipers. 25mm +/- 0.5mm
Screw drive size Use a hex driver to validate the drive size of the screws. 2mm N/A
Material Ensure the material is aluminum or stainless steel and will not rust by holding a magnet to the part. Aluminum and stainless steel (no magnetic attraction) Weak attraction to stainless steel is permissible.