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Power Operated Chucks

Guide to cutting and Gripping Forces
With the advancement of cutting tool technology, machines need to have ultra high speeds to make the optimum use of the changing technology. To match this age of high speeds, work holding for rotating machines needs high gripping power, even at very high cutting speeds. Therefore it is very important to know :
  • The cutting forces on the job at a particular speed and feed
  • The initial gripping force of the work holding device with the spindle in stationary position and at a given speed, taking into account the centrifugal forces of the jaws
  • The draw bar pull required to provide the inital gripping force

    Many factors act on the clamping point during any machining operation. While it is not possible to detail the factors here, a few relevant points that could be important are :
  • The condition of the chuck
  • The condition of lubrication
  • Surface condition of the job
  • Condition of the gripping Surface of the jaws plain, serrated or diamonds
  • Length of the gripping Surfaceof the jaws
  • Weight of the jaws
  • Speed and accompanying centrifugal forces
  • Draw bar pull

    While each one of the points mentioned above has a definite role in the ultimate gripping force, the centrifugal force is one factor that needs better understanding.

The manufacturers of chucking equipment all over the world including AIRTECH are manufacturing centrifugally compensated chucks. But these chucks have certain limitations which are :

The chucks are manufactured to compensate the centrifugal forces caused by weight of base jaw and top jaws of standard design. Any change in the weight of the jaws, changes the centrifugal force.
Again the centrifugal force will be reduced if the chuck is working on its minimum gripping capacity and will be increased if working on the maximum gripping capacity.

However it is advisable for the user of the chuck to keep the following formula in mind to find out the centrifugal force.

PC = 0.102.G.r. ( .N)2

G = Weight of base jaws and top jaws
r = The radius of the centre of gravity
N = Operating speed
PC = Centrifugal force
After having calculated the centrifugal force, the available chucking force at a given speed can be found with the help of the following equation :
Pn = PO ± PC
Pn = Chucking force at a given speed
PO = Chucking force when the chuck is in a stationary state
PC = Centrifugal force
+ for internal gripping
- for external gripping

It is advisable, that the chucking force at a given speed should be at least 1.5/ 2.0 times the cutting force, depending upon the constructional rigidity/ fragility of the job.

Mukesh Trading Company offers full range of machine tools and accessories includes work shop tools, inspection equipments, measuring tools, lathe chucks, machine vices, magnetic products, work holding equipments, CNC tooling, collets, surface plates, comparator stands, magnetic chucks, magnetic separators, Plumbing Tools, Pipe Benders,  Drain Cleaners,  Hand Tools, Power Tools,  Measuring Tools,  Carbide Tools, Cutting Tools.

Mukesh Trading Company have more than 5000 products comprising of machine tool accessories, inspection equipments, work holding equipments and magnetic products including angle plates, bench centers, tapping attachment, wheel balancing stand, power operated chucks, magnetic base, v blocks, screw jacks, sine tables, straights edges, try-squares, grinding vices, electro magnetic chucks, self centering chucks, independent chucks, tool holders, bench vices, rotary table, dividing head, drill chucks, boring heads, boring tools, high speed centers, arbors, quick change chucks, tool post grinders, keyless drill chucks, pipe centers, collet adaptors, parallel blocks.
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