Continued:
Screwcutting and power feeds:
Fitted with a choice of either a 4 t.p.i. or 8 mm pitch leadscrew, the screwcutting and feeds gearbox held solid, 6-spline shafts running on ball races and was lubricated by splash from an oil bath with a sight-level window. With an inch leadscrew, and a 45t/45t gear pair in place on the changewheel bracket, the box gave thirty-six sliding and surfacing speeds, thirty-six English pitches and thirty-four metric from one setting of the standard gear train English pitches ran from 2 to 28 t.p.i and metric from 1.25 to 14 mm - though these could be extended, by the substitution of a 30t/60t changewheel pair, to produce a range of finer pitches and feeds - nine English from 32 to 56 t.p.i. and four metric from 0.5 to  0.875 mm. However, this range could be extended, by the substitution of a 30t/60t changewheel pair, to produce a range of finer pitches and feeds - nine English from 32 to 56 t.p.i. and four metric from 0.5 to  0.875 mm When fitted with the 8 mm leadscrew thirty-four metric pitches from 0.75 to 14 mm could be cut and 36 inch from 2 to 28 t.p.i. One important caveat concerned the gearbox selection lever for it was possible to set one for inch and the other for metric threads - a situation that did not cause any mechanical damage but, naturally, gave an incorrect pitch result. A thread-dial indicator was built in to the front right-hand saddle wing and supplied as part of the lathe's ordinary equipment.
Power sliding feed rates ran as fine as what Edgwick engagingly termed "400 cuts per inch" (0.0025 inches of cut per revolution of the headstock spindle) with the optional fine-feed changewheels in place. As on many other lathes the rate of power cross feed was set to be twice as fine and so gave, at the slowest rate, "800 cuts per inch" - equal to tool-advance rate of 0.00175 inches per revolution of the spindle.
Knowing that the lathe was intended for professional rather than training use, the makers included markings to assist in the cutting of threads with 2, 3, 4 and 5 starts. The marks were inscribed on an annular plate, attached to the gear on the end of the headstock spindle, and showed the tooth spacing to be used for the first thread of 4, 6 and 8 starts. To obtain a 2-start thread the second thread was cut when the index tooth came opposite the first-start position whilst for 3-start threads alterative divisions marked for 6 starts could be used. The gear immediately below - on the second-motion shaft - was engraved with an arrow by which means the operator could cut the first thread with the arrow against the appropriate mark and then, for subsequent starts, withdraw the graduated gear, turn the spindle until the mark for the next start came opposite the index tooth, then re-engage the gear on the spindle.
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Continued:
Carriage assembly:
Power sliding and surfacing feeds were driven by a separate feed shaft from the screwcutting gearbox and both selected and engaged by a simple push/pull button - an arrangement inferior to that on most Harrison lathes where feed engagement was provided by a separate lever with an absolutely positive snap in-and-out action. The power-feed take-off was passed though a safety clutch that slipped automatically a pre-set loading. Lubrication of the apron was manually, through a filler hole - the oil being fed into a distribution tray from where it was carried by wicks to the various parts of the mechanism.
Cross and top slides were entirely conventional with the former having a full-circle handwheel and the top slide a traditional two-finger grip that allowed very precise manipulation of the feed on delicate jobs. The micrometer dials zeroed, with that on the cross slide being of a remarkably large diameter for its era and with particularly clear engravings. As a taper-turning unit was an accessory (and required room to mount) the cross slide was of the "short" variety with two inherent disadvantages: less support for the top slide and a concentration of wear in the central part of its ways. However, Edgwick did provide one unusual and very handy fitting, a device that secured the top slide exactly parallel to the bed ways. Positioned to the left-hand front side of the slide the unit consisted of a hardened plunger that passed though accurate bushings is the base of the top slide and the cross slide. A swivelling latch was used to hold the plunger out of engagement but when, for boring or other parallel work, it was necessary to have the tool in alignment with the headstock spindle, the latch could be swung out and the plunger pressed down.
Although various optional toolposts were offered, including 4-way and American types, the standard fitting was a well-made and robust square turret with three sides milled to take rectangular-sided tools and the fourth bored 1.25" to accept round fittings such as boring tools and reamer and drill holders. A hardened plunger, running through hardened bushes, located the post, the whole unit being spring mounted so that, upon slackening the locking handle, the block was lifted and could be rotated to a new position.
Of substantial construction, the tailstock carried a No. 3 Morse taper barrel - when a No. 2 might have been expected on a machine of this size and era - and could be set over for the turning of shallow tapers. An attached lever, operating a simple cam-form cross bar that pulled on an eye-bolt, locked the tailstock to the bed - no self-hiding loose spanners to waste the time of the Edgwick operator.
Supplied as parts of the lathe's standard equipment were a 4-way toolpost, one 7-inch driver plate, one 12-inch faceplate, two No. 4 Morse taper centres, a grease gun and the necessary spanners..