Parametric Socket to Pentagonal Coffee Grinder Bushing

A number of companies sell cheap stainless steel hand coffee grinders with a pentagonal shaft where the handle connects; $9 at Walmart last I checked. This is an adapter to drive those grinders with a cordless ratchet or drill; it's intended to sit in a metric socket of your choosing. Printed in PLA with 6 perimeters; print the adapter with the hole pointing up. I'm using this with a 1/2" ancient blue Ryobi cordless drill at 350RPM, so this thing can handle plenty of torque. The inner hole is pretty tight, that was a deliberate decision to spread the load better.

INSTRUCTIONS

Set a socket size in mm, as well as a height for your bushing. If you're using imperial sockets/nut drivers, use the "Imperial Fudger" to add the tenths and hundredths digits. (IE, 15mm + Imperial Fudger 88 = 15.88mm = 5/8".)

Inches Fractional
Inches Metric Metric Decimal
Inches
Dimensions — Inches to Metric Dimensions — Metric to Inches
0.375” 3/8” 9.53 mm 4.3 mm 0.169”
0.438” 7/16” 11.13 mm 4.6 mm 0.181”
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