Harold_V wrote:Only the Sag 12 had the speed change that you described. I've included a picture of the body of a blowpipe for bagpipes that was turned with the aid of the tracer. I used the tracer for a multitude of projects after the spacer job, most of which would have been beyond the capability of the lathe without the tracer. The aluminum in question, above, was purchased from Jorgensen! Keith Miller was the field rep in Utah at the time. Over 600 spacers were produced with excellent results. Spacers were made from 5½" 7075-T6 with a 7/8" wall. Couldn't have done the job without the tracer, for they had a 1" radius tangent to a 7° angle, with ±. I bought mine new, 1967, and purchased the tracer about 18 months later when I was awarded a contract with the military for turning spacers for the main landing gears for C-130 airplanes. I've come to call the Sag 12 a "poor man's EE". Having run a new EE Monarch for over a year, stepping down to the Graziano wasn't the most pleasurable thing I've ever done, but I sure can't complain about the service I've received.
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The gear changes take place via electromagnetic clutches, with four speeds, plus a forward and reverse clutch. As you know, they run very smoothly, although the lubrication pump is rather noisy, and has been on all I've seen. Three V belts drive the spindle at the end of the headstock. While the Sag 12 has a high and low range in the headstock, the speed changes occur in the transmission, which is housed in the base of the machine, directly coupled to the motor. You probably know that Graziano is long gone, just like the majority of machine tool builders. All their other machines, all larger, had geared headstocks.
Only the Sag 12 had the speed change that you described.
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