Harbor Freight 9 Inch Bandsaw 84T Gear

thingiverse

The Harbor Freight 1/3HP 9 in bandsaw excels at cutting wood, but its FPM blade speed is woefully inadequate for metal. Cutting aluminum is borderline acceptable, yet thicker steel simply melts the teeth. I've designed a gear upgrade to modify the Harbor Freight bandsaw's blade drive gear from 28 teeth to 84 teeth. This reduction will lower the factory blade speed of 2460 FPM to approximately 820 FPM. Although still somewhat rapid for metal cutting, given the space constraints, a significantly larger pulley won't physically fit. The only way to reduce the ratio further is to decrease the motor gear, but I've been unable to remove the bolt that holds it in place due to an allen bolt being used. The bolt has seized and the allen hole rounded before breaking loose. Too lazy to weld on a nut or something to get it off. The gear I designed is intended as a "slip on" onto the factory gear, which will slide into place and function as a larger gear to provide increased reduction. Ideally, this should be printed with an SLA printer for optimal resolution; however, a .4mm nozzle FDM printer *may* also work. For those using a SLA printer, I *WILL* slice the pulley into 3 pieces due to the limited build plate size of most resin printers. These 3 pieces can then be superglued together to form the entire gear. The required timing belt is a uxcell 196XL 98 teeth 5.08/0.2" pitch 10mm width belt. After sanding and filing, the piece now fits nicely over the factory gear. Still need to superglue the pieces together and wait for the belt to arrive. *****This is still a work in progress***** I've yet to print this and attach it on. But once I attach it on, I will also provide the part number for the appropriate length timing belt. (UXcell makes these timing belts of the same pitch and width. If you see this message, DO NOT PRINT IT YET (or you may waste filament). After I confirm that the fitment is perfect, I will remove this message and finalize everything.