Changewheels (and metric-to-inch and inch-to-metric transposing gears) to fit Boxford and other South Bend 9-inch Clones (e.g. Ace, Hercus, Purcell, Smart & Brown Sabel, S and SAB, Blomqvist**, Parkanson, Purcell, Sheraton, Storebro**, etc). All are 18 D.P. with a 14.5-degree pressure angle and 0.125" depth of tooth. They are 3/8" wide, have a 9/16" bore, and a 1/8" wide keyway. The idler and compound gears (two gears on one shaft) are different: they have a 5/8" bore with no keyway and are fitted to a hardened bush held in place with a through bolt. Click in the "Teeth" box below to select the sizes you require. All original Boxford and South Bend gears were in cast iron. However, for 20t and below ours are in steel for greater strength and reliability. Other Boxford gears are also listed including the "2-pin" gear that fits into the headstock pulley to provide part of the backgear mechanism. While most changewheels are kept in stock for same-day dispatch, non-standard gears (i.e never part of the original Boxford or South Bend set (and especially prime numbers) have to be made as one-offs and therefore cost more. The list of gears shown below all those one used in the Boxford and South Bend sets - plus those we've been asked to make for some special purpose. While most are kept in stock, the 127/100 and 135/127 transposing gears are made in smaller batches and, if not listed, will be out of stock.
We have one or two unusual gears available secondhand: 33t, 37t, 39t, 42t, and 47t.
80T idler gears are now out of stock - but the standard 80T gear is easily modified - just bore the center and machine up the spacing boss that needs to be 28.5 mm in diameter and 10mm deep. Any questions? Please phone and we'll be pleased to help: 01298-871633.
**Please note: later models of the Blomqvist have different gears: Module 1.5, a 2-degree pressure angle and are 10mm thick. The Storebro Rex-Valter VF118, which is also a clone, has the same metric changewheels.