During 1951 a slightly cheaper version of the Boxford lathe was introduced, the 4.5" x 16" Model CSB - possibly standing for "Model C School Boxford". Unlike the 22" between-centres Model C at £112 that lacked electrical equipment in its basic price, the CSB was delivered complete, ready-to-run with a 1/3 h.p. motor for £105 - a total saving of some £16 : 5s : 0d.  The simplified 8-speed drive had the motor bolted direct to the countershaft upright instead of on a separate, adjustable horizontal motor platform. With a single-pulley drive on motor and countershaft, and using backgear, the eight spindle speeds were: 38, 55, 87, 125, 200, 285, 450 and 650 r.p.m. By paying £3 : 10s : 0d extra the motor and countershaft could be fitted with 2-step pulleys as used on the more expensive versions of the lathe - when speeds became a more useful: 38, 55, 75, 87, 110, 125, 175, 200, 250, 285, 400, 450, 570, 650, 900 and 1300 r.p.m. Unfortunately the makers neglected to mention the fact that in order to run on top speed a more powerful and expensive motor was required. To adjust the motor-to-countershaft belt tension meant repositioning the motor itself - however, once this had been done it was not normally necessary to make any further changes until the belt began to wear.   Early examples of the CSB were different, and fitted with the novel, quick-action belt-tensioning device used on the lathes of the late 1940s - probably a case of using up no-longer-needed spares. Other evidence of clearing storeroom shelves was the use, throughout the life of the model, of an early-pattern South Bend type saddle with its simple screw-in, rather than bolt-on, cross-feed screw support bracket. Ambitious advertising in the model-engineering press of the day attempted to position the CSB as an alternative to the Myford ML7; unfortunately the Boxford cost nearly twice as much and, although it did offer a number of advantages, there can have been few takers. A "Training" version of the lathe, the CSBP, was also offered: shorn of screwcutting equipment and usually, but not always, without backgear, this simple model was aimed at the school and college market and had very little appeal for the model or experimental engineer..

The Boxford CSB as it appeared in 1965. This version has the later bed feet, a simplified countershaft and a much lighter carriage handwheel