I'm trying to salvage a decent quality paper shredder in perfect working order save that the shaft end of the final gear in the gear train that drives the cutter rollers sheared off.
After perusing online and thru some old Boston Gear and Torrington catalogues I happened to have, I was able to determing that the failed part was fabricated from "drawn pinion wire".
Best I can determine the specs on the part are these;
6 teethOD (tooth tip to tooth tip) of .332 inches (measured)
Pitch diameter of .250 (implied from Rush Gears Inc table and eyeballed on failed part)
Pressure angle "looks" to be 14.5 degrees.....(eyeballed from generic online diagram comparing 14.5 degrees PA to 20 degrees PA)
The pressure angle is really a complete guess. With decent quality calipers the thickness of one gear spur at it's root is about .065 inches. The width of the opening between two adjacent gear spurs at the root was about .045 inches. The "ID"? across the pinion diameter from "root to root" is about .152 inches.
The part is 1.5 inches long.
Two questions;
Based on the above, is there any clear indication what the pressure angle is?
Does anybody here know of a source for this small size drawn pinion wire in a small quantity. At a bare minimum I need 1.5 inches but I'd like to get some extra in case I booger the required lathe turning operations to finish the part out.
I'm going to call Rush Gears Inc 1-800 number tommorow, see what they have but I suspect I'm looking at a minimum order far in excess of what I need. Thought I'd see what I could shake loose here in the mean time.
Thanks for any insight,
Dennis van Dam