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The spindle is driven, either by foot power from a treadle and flywheel or by a belt or gear drive to a power source. In most modern lathes this power source is an integral electric motor, often either in the headstock, to the left of the headstock, or beneath the headstock, concealed in the stand.
In addition to the spindle and its bearings, the headstock often contains parts to convert the motor speed into various spindle speeds. Various types of speed-changing mechanism achieve this, from a cone pulley or step pulley, to a cone pulley with back gear (which is essentially a low range, similar in net effect to the two-speed rear of a truck), to an entire gear train similar to that of a manual-shift auto transmission. Some motors have electronic rheostat-type speed controls, which obviates cone pulleys or gears.
Technical Specifications
| MODEL | HHL-12 | HHL-16 | HHL-20 | HHL-24 |
|---|---|---|---|---|
| Length of Bed | 12” | 16” | 20” | 24” |
| Width of Bed | 26” | 26” | 28” | 28” |
| Height of center | 24” | 24” | 25” | 26” |
| Swing over Bed dia. | 47” | 47” | 51” | 51” |
| Swing in Gap dia. | 72” | 72” | 76” | 76” |
| Width of gap intent of face plate | 14” | 14” | 15” | 16” |
| Swing over saddle dia. | 37” | 37” | 41” | 41” |
| Admin between centre | 70 * | 120* | 155* | 213* |
| Spindle hollow | 4 ¼ ” | 4 ¼ ” | 4 ¼ ” | 4 ¼ ” |
| No. of Spindle speed | 5 | 5 | 6 | 6 |
| Size of Morse taper | 5MT | 5MT | 5MT | 5MT |
| Lead screw pitch | 2PTI | 2PTI | 2PTI | 2PTI |
| Power required in H.P. | 7.5 | 10 | 15 | 20 |
| R.P.M. motor approx. | 960 | 960 | 960 | 960 |
| Approx. weight in Kgs. | 5000 | 6000 | 7200 | 8000 |
| OPTIONAL ACCESSORIES | STANDARD ACCESSORIES | APPLICATIONS |
|---|---|---|
| 1. Electric Motor & Starter | 1. Face Plate(One) | 1. Oil country |
| 2. Electric Coolant Pump | 2. Chuck Plate(one) | 2. Steel & paper mills |
| 3. 4jaw independent chuck | 3. Centers(Two center adapter(One) | 3. Power plants |
| 4. 3jaw self centering chuck | 4. Stationery steady(One) | 4. Ship building |
| 5. Gears to cut metric threads | 5. Follow Rest Assembly(One) | 5. Mining and textile industries |
| 6. Taper turning attachment | 6. Set of 22 change | |
| 7. Tool post grinder | 7. Gears (One) | |
| 8. Double Gap or Triple Gap etc. | 8. Motor Plate (One) | |
| 9. DIGITAL READ OUT (DRO) | 9. TOOL BOX | |
| 10. REVOLVING CENTRE | 10. INSTRUCTION MANUAL | |
| 11. NORTON GEAR BOX |
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