Use and maintain face drivers for lathes

When supplied, face drivers are ready-to-use in average work conditions.

How to order

Sizes 22/32, 30/45 etc. represent the minimum turnable diameter in mm, respectively by “internal” or “external” pins.

TP-E stands for the version referring to the overall dimensions of drivers, i.e: Type NP - Normal protected type; Type E - With extracting ring nut. The available coupling (Morse taper) appears in Table 1 (Page 28), whereas mean use diameters are detailed in Table. 2 (Page 30). Each driver includes set of pin, (pin type according to the customer’s request) and is delivered in a case made of cardboard and polystyrene. Pins can be ordered for right driving (part. 09/10) or left driving (part. 07/08) respectively for clockwise or counterclockwise revolving machine (driver seen from the work swupport side).

Unless otherwise specified "Outward left" pins are assembled as standard (part. 08, appropriate for best work conditions and counterclockwise rotation). U-type pins (universal),both inward 08/10 and outward 07/09 U are to be used on machine with work cycles that revolve in both directions.

To be supplied on request: spare pins, centers and crozes for tube machining (part. 25-26) (Page 27). For machines having no bar passage, type E with built-in extractor is recommended. Each order should quote: pin size, type and quantity, Morse taper (if necessary, order tube centers (part. 25) as well as croze type and number (part. 26), by the aid of Table 3.

Owing to ever-recurring technical improvements, OMAP reserves the right to constantly update data and sizes.

Use and maintenance

When supplied, drivers are ready-to-use in average work conditions. Spring preloading on the movable center is proportional to the weight of the part and the load of the working tool; if the layout or number of Belville washer or either the thrust of the centre are modified, specific work conditions are easily be obtained, according to the features of the machine, the workpiece, the cutting speed, the depth of cut, the safety and duration of driving pins.

Prior to assembling the face driver, check the conditions of the conical seat on the machine and, if need be, remove any unevenness or fault. For good results, eccentricity between the face driving center and cone should be restrained to 0,01/0,02 mm.

Make sure that the load of the work support does not differ remarkably from ideal conditions (those shown on Table 2, page 30). Do not expose pins to impact. High-speed steel pins are processed purposely to resist the severest driving stresses.

Disassemble pins by the use of a pair of pliers (or a wrench); turn them by 90°, thus nullifying the effect of return springs. Pin disassembly does not require removing any part of the face driver but working on the machine tool only.

Pins can be sharpened normally, provided that etching angles are respacted. To machine hard material. (≥ 350 Brinell), we recommed sharpening pins and increasing etching angles from (60° + 15°) = 75° to (60° + 20°) = 80°. For soft material (≤ 100 Brinell) increasing etching angles to (60° + 30°) = 90° is recommended.

The unit composed of center, spigot and spring is disassembled by removing the rear plug. The whole front unit is released by loosening the face dowel. After working for a while, checking spring elasticity and, if necessary, replacing them with the spares supplied, is recommended.

Every now and then (erspecially if pins are replaced), lubricate with quality water-repellent grease.

No extraordinary maintenance is necessary.

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