Parametric Reel Mower Sharpening Adaptor (Backlapping)
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Parametrized adapter to sharpen any reel mover by backslapping using a drill.
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- Creative Commons — Attribution
Back lapping is a cheap and easy method of sharpening a reel mower.
I have marked in the images what measurements you need to make the adapter fit your mower. Add some extra for tolerance reasons. When in doubt go larger, so long as the axis key can't fall out extra space shouldn't hurt at all. The default parameters are the larger of both mowers for each parameter, so it fits both in the images. Use OpenSCAD to adjust parameters in .scad file to match other mowers.
I recommend printing with enough perimeters to fill the entire model for strength.
you will need a 1/4" socket to use the adapter. Most driver bit sets come with one. Alternatively modify the file to fit another head. Don't make the adapter have a hex-arm for the drill shuck to grab, those aren't strong enough.
Back lapping instructions
Remove a wheel of your reel mower
Take the measurements needed for the adapter
Print the adapter with your measurements
Tighten the reel mower so that the blade reel rubs sligtly
Apply valve lapping compound to the blade reel
Rotate the reel backwards using the drill with the adapter
Notes:
I needed to prop the mowers up, as their other wheel would make contact with the ground You could also take the other wheel off as well, but on the green mower that was annoying to do.