Pratt Burnerd power chuck

The Gripfast Combination Power Chuck is designed for ultra-quick jaw changes in seconds - ideal for small batch production on CNC lathes and turning centres. Now comes in 5 and 6 jaw versions to handle delicate components and also a new 3+1 Gripfast chuck has recently been added to the range.

International Power chucks have a repetitive gripping accuracy of 0.025mm TIR and are fitted with the setrite feature as standard. Designed specifically for use on CNC lathes.

Self-contained power chucks have a built-in air cylinder actuated by an interlocked control unit, or they can be interfaced directly from the lathes own control system.

International Power Chucks

• The International Power Chuck from Pratt Burnerd. 
• The ideal chuck for conventional and high speed applications.
• The design and quality of the Independent Power Chuck makes it ideal for both conventional and high speed applications, where operating costs are reduced because of larger through bores, wide jaw movement and high operating speeds.

Key Features 

• High tensile steel body

•     Repeatability of ±12 µm
•     120µm adjustable Setrite feature built into the chuck body, allowing the user to adjust workpiece centrality to virtually zero, saving time and extending top jaw life
•     Ideal for high chucking speed operations – up to 6000 rpm
•     Extra large bores to accommodate bar/pipe work and supplied with cover plate for closed centre
•     Utilises the lathes’ existing actuating cylinder, including short stroke versions
•     1.5mm x 60° or 1/16 x 90° jaw serrations available, to suit existing top tooling
•     Easily removable blank sleeve connector in the chuck allows you to bore and thread to the existing drawtube or bar, on any type of lathe
•     12 month warranty

2: Self Contained Power Chucks

Pratt Burnerd offers a range of pneumatically-operated power chucks with an incorporated cylinder. 
The Self Contained Power Chuck simply bolts onto the lathe spindle nose - no rear mounted cylinder or drawtube is required, just airline connections from the control unit. 
The chuck’s simplicity allows rapid interchangeability with standard manual chucks or collet chucks and is perfect for small and medium batch component production on conventional lathes and all models of CNC machines for either bar or chucking work.
These easy retrofit self contained power chucks can quickly help you turn your existing manual lathe into a production machine.

Key Features

•     Precision manufactured to fit types A and D spindles and adaptor mounting
•     Suitable for all bar and chucking work
•     Repetitive gripping within 25µm TIR
•     Failsafe – chuck operates independently of air supply when gripping
•     No separate actuating cylinder is required
•     No drawtube to restrict bore
•     Less overhang and lighter in weight
•     Quick, simple lever or foot pedal operation
•     Minimum of maintenance is required
•     Sizes 160mm to 350mm available
•     Optional top jaws available
•     1/16” x 90° serrated master jaws supplied as standard
•     12 month warranty

Gripfast Power Chuck

• Quick change jaw system that allows base and top jaw sets to be exchanged in under 30 seconds, utilising either hard or machined soft jaws or your existing library of special top jaws, 60°, 90° or cross tenon etc
• Replaces a Collet chuck. The base jaws are ground to accept Collet pads within the chuck body for accuracy and increased gripping performance
• Setrite feature for finite adjustment ensures better and more consistent surface finish of the component
• Optional mandrel attachment allows internal gripping without necessity to remove and replace the chuck
• The Top Jaw Setting Fixture allows the operator to prepare top tooling for his next job while the machine is cutting metal
• The unique in-built anti-centrifugal counterbalance mechanism reduces loss of grip at high speeds
• Average payback time of less than 6 months