GMT STANDARD PHNC LATHE CHUCK WITH SPECIAL JAWS
Desired Runout achieved!
GMT LATHE CHUCK CASE STUDY
CUSTOMER : EPE Process Filters & Accumulators Pvt Ltd, Hyderabad
COMPONENT : Accumulator (Top Cover & Bottom Cover)
OPERATION : Turning, Facing and Grooving.
DIMENSIONS OF THE COMPONENT: OUTER DIAMETER-105mm&THICKNESS -75 mm
REQUIRED ACCURACY: Face out and OD run out (Ovality) after machining using our chuck should be within 0.3 mm. Note: *OD -outside diameter
A lathe chuck with which the manual truing time can be eliminated (Centering with dial gauge for each component before actual machining on CNC lathe)
Based on drawings and the video below sent by the customer, initially, GMT recommended a 3B 254 UBLC Lathe Chuck (Universal Ball Chuck Chuck) with guide pad and 1 set of special jaws with HSS insert and 1 set of three rest piecesand rest rings, support pin and 1 set of spring-loaded Aligner to hold component. This component required rigid clamping to get the desired runout. In addition, the clamping force could not be reduced to meet the component requirement with the non-GMT cylinder used by the customer.
Fig. 1 COMPONENT
GMT conducted trials of batches of 5 to 10 Nos in each with the UBLC.
The runout on the component OD was in the range of 0.3mm to 1mm, but the Face-out was in the range of 0.1mm to 0.5mm. The customer had not indicated the face-out limits in either their initial drawings or the video. So, we were unaware of the requirement.Further, the ovality observed in the blanks supplied by the customer was already at 0.2mm / 0.5mm.
After several iterations, over the course of several trials, GMT recommended a 4B 250 PHNC Lathe Chuck with special jaws, rest and orientation pieces and an 80Ф CH-S Cylinder. The GMT Hydraulic Cylinder had to be used, as the customer’s existing cylinder could not meet the required pressure to operate the jaws.
Fifteen components were machined and the runout (Ovality) in component the OD was observed within 0.4mm, which was acceptable to the customer.
Fig. 4 View of the GMT Lathe Chuck Mounted on the Customer’s Lathe, Ready to Commence Production
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For more special chucks from GMT, check out this page: https://gmt.co.in/special-workholding/
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