HARBOR FREIGHT 6LB (DUAL DRUM, CENTRAL MACHINERY) ROCK TUMBLER DRIVE PULLEY
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the drive pulley on my HF central machinery rock tumbler gave out and split right down the groove so I remodeled it.
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a a emodeled version go the drive pulley (without fan) for the central machinery 6 lbs (dual drum) rock tumbler. Mine split down the groove and I also upgraded the somewhat larger and longer lasting EPDM AS-343 O ring 343 3/4" diameter, w 3/16"cross section, pack of 25 from Zoro.com for about $17) Modeled to acccomodate an M4 brass heat set insert and a small lip to accommodate the fan portion which is glued on to the pulley portion. I printed in PETG but might do nylon next time I have it loaded for extra heat resistance but PETG should be fine for now. Runs nice and smooth and quieter esp. with o-ring than stock (might want to ream central axis to 6mm to install). Enjoy!
Modelled v4, has reduced diameter hub to fit into stock fan piece for easier fitment and chamfered underside for better printing. also enlarged heat insert hol\e for easier straighter installation (M4 x 6mm) insert.
NB: small artifact in the set screw bore but only in rendering of the model; does not appear in the actual print. also PETG eventually failed as did ASA (thermal conductivity between drive shaft and brass insert of set screw conducted too much heat, soften pulley body an failed.) Have preprinted in PA6-CF ands looks promising.