Large gear for Boston pencil sharpener
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Replacement gear for a Boston Model 19 pencil sharpener.
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- Mechanical Parts
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- Creative Commons — Attribution
This gear was made with the help of STLGears.com I chose a spur gear with these design parameters.
The circular hole is just to know where the center is. I then import the file, scaled for the proper diameter (Spur_M0.7_Pa20_Z71-2mm-ch-5487.stl) into Openscad to add the hub and the rectangular cutout.
The Spur_M0.7_Pa20_Z71-2mm-ch-5487.stl file needs to be in the same directory as the large-gear.scad file should you wish to make some adjustments.
The file to use is large-gear-shaft-fit-v4.stl
I used PLA with 4 perimeters and 15% honeycomb infill. The gear fits tightly on the rectangular shaft and a generous amount of white lithium grease is added to both gears.