Goodell-Pratt Model 485 Hand Crank Grinder 3: Gearing

1,632 views · Published 16 December 2012 · 0:26 · Indexed 29 September 2026

Channel: Rick McQuay · 2012 · Science & Technology

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Cranking slowly so as not to sling oil over myself. The 485 has a series of gears unlike every other grinder I've taken apart which only have two.

With a 22:1 gear ratio, this thing moves. At a leisurely one crank per second it achieves 1320rpm and two cranks per second is not difficult.

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