Super 7 Connoisseur, Vari - speed, belt driven, back geared, screw cutting, bench mounting centre lathe 89mm (3 1/2") centre height x 475mm (18 3/4") or 780mm (30 3/4") between centres, with Headstock Spindle bored 26mm to clear 25.4mm (1") and incorporating a safe reversing feature. The spindle nose is bored and ground 4 M.T. Imperial model with 10 TPI cross slide and top slide feedscrews and nuts, inch graduations on the tailstock barrel and leadscrew handwheel or Metric model with 2.0mm pitch cross slide and top slide feedscrews and nuts, metric graduations on tailstock barrel and leadscrew handwheel. The lathe bed is cast in grade 240 iron with Induction Hardened Bedways as standard. The lathe is fitted with a Quick Change screw cutting Gearbox, which in conjunction with the 8 TPI leadscrew gives 24 imperial /inch threads and 24 feeds; a thread dial indicator is fitted to the apron. (For Metric, B.A., odd threads and pitches, the optional 1481/1 Metric Conversion Set will be required).
The machine is fitted with a Countershaft Clutch unit. A plain taper front headstock bearing supports the spindle in radial loading while a pair of angular contact ball races at the rear provide support for axial loads. The spindle nose is threaded M42.5 x 2mm pitch. An indexing plunger can be engaged with the 60T Bullwheel to provide simple indexing of the spindle, up to 120 divisions. Variable spindle speeds from
26-3000 rpm. are achieved in three distinct speed ranges, by a two speed drive from countershaft to headstock spindle and a backgear reduction. Both primary and secondary drives are fitted with Poly-V belts. All drive guards are secured with 1/4-turn latches opened by a special square drive key.
The carriage features power cross feed (facing), a tee slotted cross slide and the top slide swivels 360°. Both cross slide and top slide feedscrews are fitted with adjustable micrometer dials. The cross slide feedscrew is fitted with a needle thrust bearing to increase sensitivity.
The tailstock is a self ejecting type, and the barrel feedscrew has a three start thread to give rapid movement. The tailstock handwheel is fitted with an adjustable friction dial, having 60 divisions, reading 0.005" per division. A metric version is not available, but the equivalent per division is 0.127mm. The barrel is precision bored 2 M.T. The tailstock body can be set over on its base in either direction to turn long, shallow tapers.
The drive is motorised by a 0.75 Kw (1hp), 230 volt, three phase, 50/60 Hz, resilient mounted, industrial rated motor. A separate enclosure houses the electrical installation which includes a lockable isolator, start and stop buttons, forward/reverse and run/jog selector switches, and a mushroom head emergency stop button with turn to release.
The electronically controlled variable speed inverter control features no-volt release and thermal overload protection and only requires a 230volt, single phase, 50/60 Hz power supply, with fuse protection of 10 amps from the customer?s supply. A 10 turn potentiometer gives sensitive speed control and is accompanied by an electronic tachometer with digital display. Power inlet is via a CEE 17 plug with 3 metres H07 insulated cable, for 230 volt, single phase, 50/60Hz A.C. supply.
Please note:- The power supply should be derived from a live and neutral feed with a separate earth. In some North American markets a 220 volt 60 Hz single phase supply is derived by using 2 hot phases from a 3 phase supply; this is not a suitable power supply.
We can now supply control units to satisfy those markets where the single phase supply is 110 volt 50/60 Hz. If required please specify when ordering.
Machines can be supplied for either bench mounting or fitted to a heavy duty Industrial Stand.
ACCESSORY LIST (INDEX, STANDS, CHUCKS, STEADIES, COLLETS, RACK OP. TAILSTOCK, ROT. CENTRES, TOOLING SETS)