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Precision Engineering Details
This is a newly machined 47/37 transposing gear set which converts your 8 TPI lead screw to a 2.5 mm pitch. The thread’s crest-to-crest or lead error is only 0.02% (about 0.0025 inch for a one-foot long threaded rod). These compact transposing gears are under 3 inches in diameter, leaving plenty of room for closing your factory gear cover without interference.
I manufactured these specifically for the South Bend 9 Model A lathe featuring a quick-change gearbox. The transposing gear system will interface with other South Bend 9 models as well, but this exact kit layout is fine-tuned for the 9A. The gears have a diametrical pitch of 18, are meticulously sliced from rugged 6061 billet aluminum, and include the matching custom installation bolt and bushing.
Supported Isometric Pitches
0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, 0.50mm, 0.60mm, 0.70mm, 0.75mm, 0.80mm, 1.00mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, 2.50mm
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