![]() The Celtic 20 also had changes made to the screwcutting arrangements with the new settings providing 53 inch pitches (63 previously), 45 metric threads (35 before) but the same number (54) and rates of longitudinal and traverse feeds. ![]() In line with these changes the optional threaded spindle was (thankfully) dropped and the options introduced of either a long-nose taper in a L0 size, a modern Cam-lock fitting or even a 2 Bayonet. The lower-power 2-speed motor (2-1.6 hp) was dropped and the original high-power unit (3-2 hp) became the standard fitting with a 4-2-8 hp motor introduced for the high-speed version-although the spindle speeds remained, as before, at 24 to 1000 rpm and 38 to 1600 rpm.
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