Logan 9" with screwcutting gearbox and power cross feed, but without an electric motor fitted - circa 1956
The 9" Logan lathe was available with a capacity of either 17" or 28" between centres and, by 1956 at least, could be ordered with various combinations of a screwcutting gearbox and power-feed apron. Like South Bend and Boxford, the range divided into simple groups:
Plain apron and changewheel screwcutting - Model 9B28-61
Powered apron and changewheels - Model 9B28-41
Plain apron and screwcutting gearbox - Model 9B9B28-21
Powered apron and screwcutting gearbox - Model 9B28-1
In the case of the 17" between centres lathes the model designations were identical - but with the figure 17 substituted for 28.
With a nose thread of 1.5" x 8 t.p.i., a bore of 25/32" and a collet capacity of 0.5" the No. 3 Morse taper spindle, ran on sealed-for-life ball races, the pre-loading of which was set at the factory. The makers claimed that the spindle run-out 12" away from the nose was as little as 0.001"; an adaptor was supplied to sleeve the spindle from a No. 3 Morse taper to a No. 2.
Of traditional American pattern the ground-finish bed had two raised Vs and two flats, the saddle ran on one V and one flat - the tailstock on the other V and flat. The bed could, at extra cost, be ordered flame-hardened.
Mounted independently of the lathe the simple, bronze-bearing countershaft was able to provide twelve speeds of 55, 80, 112, 144, 200, 253, 353, 459, 645, 831, 1157 and 1450 rpm. - although the very early 9-inch lathes may have had the backgear speeds set somewhat lower. The motor, fastened directly to the countershaft casting, was fitted with a two-step pulley - whilst the countershaft-to-spindle drive used a 3-step V pulley. The belt was tensioned by a traditional "over-centre" lever with a screwed adjuster.
Although Logan lathes are rare in Great Britain, in early 1999 a strange 9" lathe, with no maker's markings and looking like across between a South Bend and a Boxford was hauled out of a van in the author's driveway with the riposte, "Bet you don't know what this is, then!". As the owner didn't believe me when I suggested that it might be a Logan from the USA, I told him to check if the spare headstock bearings that lay in the bottom of the accompanying bits-and-pieces box were marked "New Departure", a name unheard of amongst amateur engineers in England. He almost fell over backwards when that, indeed, proved to be the case.
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