Logan 10-inch Lathe
9" Lathe 10" Lathe 11" Lathe 12" Lathe 14" Lathe Headstock Spindle
Logan Home Drive Systems Carriage & Bed Accessories
Although one might have expected Logan to build the their popular 10-inch lathe on the same bed as the 9" model, this was not the case. The bed was 7/8" wider over the ways and the standard between-centres capacity was increased from 17" to 24" and the longer-bed version from 28" to 33". This was obviously a serious upgrade, and not mere tinkering with the specification.
Fitted as standard with power cross feed the lathe had, like the 9-inch, the option of screwcutting by changewheels or gearbox. It could be supplied for bench or stand mounting with, originally, flat belt drive. By 1953 V belts had been introduced and the bench model employed all-V-belt drive, 12-speed, rubber-mounted countershaft unit with its spindle running on ball bearings. The belt tension between lathe and countershaft was relaxed by an automatic coupling when the headstock-guard cover was raised. Alternatively, in the 24" version only, it could be fitted to a neat, underdrive cabinet stand which held a 16-speed, ball-bearing countershaft which used three belt runs to transmit power to the headstock spindle. The first belt, from the two-step motor pulley, was arranged in a South Bend-like manner with a double-step V pulley on the motor transmitting power via a V belt to a large-diameter, two-step flat pulley on the countershaft. A standard V belt and pulley arrangement then provided a choice of 4 (rather close) ratios to an upper countershaft - and from there a double V belt took the drive to a pulley outboard of the left-hand headstock spindle bearing. The models intended for bench mounting could also be fitted to one of the maker's simple floor stands with cast-iron legs and sheet-steel chip trays.
Apart from the increase in centre height, the headstock assembly seems to have been almost identical to that used on the 9". The spindle was fitted with a No. 3 Morse taper, a nose thread of 1.5" by 8 t.p.i., a bore of 25/32, a collet capacity of 0.5" and, like that of all Logans of the period, pre-loaded, grease-sealed, precision ball bearings - in the case of the 10-inch one double-row at the front and a single row bearing at the rear. An adaptor was supplied to sleeve the spindle nose from a No. 3 Morse taper to a No. 2.
Machines intended for bench mounting were given twelve spindle speeds - whilst those fitted to the underdrive cabinet stands boasted a useful sixteen. The speeds were not the same as those of the 9" lathe, although the lowest and highest speeds of each were to within a few r.p.m of each other. The simple, plain-bearing countershaft, mounted independently of the lathe, was able to provide twelve speeds which, on the earliest lathes from 1941, ranged through 30, 56, 70, 104, 131, 244 in back gear and 179, 334, 420, 620, 780 and 1450 r.p.m. in open speed. Later lathes had all but the top speed increased slightly (which would not have helped with screwcutting on the lowest speed) and were geared to produce 55, 80, 112, 144, 200, 253, 353, 459, 645, 831, 1157 and 1450 r.p.m. The 16-speed underdrive version had a slightly different range which, on lathes built from the early 1950s, covered: 38, 53, 69, 96, 82, 112, 148 and 205 rpm in backgear and 228, 318, 414, 490, 576, 676, 888 and 1230 r.p.m. in direct belt drive.
A full range of equipment to convert the lathes into production machines was available and included six-station capstan and lever-operated turret assemblies, lever and screw-feed cut-off slides with twin toolposts and quick-action collet closers.
Very early lathes were fitted with a different design of apron and saddle to the later machines--the first aprons being equipped with a leadscrew half-nut guide made from a stamping and secured with two recessed machine-screws and two pins, the whole apron being about 91/4 inches long. Later, to improve rigidity, the half-nut guide was machined from a solid block and held in place with 4 exposed hex bolts - this type of apron, and hence the saddle, being some 3/4-inch or so longer.
In 1954 a 10" x 24" Logan, with power cross feed as standard (but screwcutting with changewheels), cost $410; adding a gearbox increased the price to $510 whilst the most expensive model, mounted on a full cabinet stand, was listed at $647.
Experienced users of 10" Logan lathes report that they are a heavy and sturdy unit, vastly superior to the more common Atlas-Craftsman lathes. However, to be fair, the latter two were considerably cheaper - the 12" Craftsman version costing only $260 in basic form or $330 with a screwcutting gearbox. Given a choice today of either an Atlas-Craftsman or Logan lathe in similar condition, it must be obvious which is going to make the better long-term investment.
The lightest 10" lathe for bench mounting weighed 435 lbs whilst the heaviest, on the cabinet stand, turned the scales at 765.