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FEATURES
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DOUBLE-FACE-CONTACT IS DESIGNED FOR USE WITH STANDARD MACHINING CENTER.
A Double-Face-Contact is indispensable when the requirement is for high speed high quality finishing, or heavy cutting application. SHOWA D-F-C shank tools can be used on any machining centers fitted with a standard spindle (National taper 7/24). A special machine spindle is not required for these holders. The axial tolerance of the spindle nose is automatically adjusted by the 7/24 taper sleeve acting against the Belleville springs.
DURABLE AND STABLE DOUBLE-FACE-CONTACT SYSTEM.
The 7/24 taper sleeve adjusting system provides a reliable and stable Double-Face-Contact, without being influenced by the expansion of the spindle taper by centrifugal forces caused by high spindle speeds, or by wear in the spindle by prolonged use. Solid type double-face-contact and HSK type tool holders are not flexible enough to control this.
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PRINCIPLE
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When the holder is loaded into the spindle, the taper sleeve first makes contact with the machine spindle, and as the pull-stud mechanism draws the holder back, it is automatically centered. As the tool is drawn back further by the pull-stud, the sleeve and spring allow the rear flange of the tool holder to make contact with the machine spindle. The D-F-C holder is then held positively by Double-Face-Contact between the spindle taper and nose.
NOTE: Different type D-F-C shanks are available for different standard spindles, such as BT(JIS B6339), SK(DIN 69871-A) and CV(Catapillar V).
SHOWA D-F-C tool is not applicable to other special spindles of which distance from spindle nose to the gauge line is non-standard. For more information, contact your SHOWA distributor.
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Features of SHOWA D-F-C shank tool at high RPM
Even when the taper portion of a machine spindle is enlarged by high rotation of more than 20,000min-1, the tool will not axially move and the taper sleeve only goes up to keep close contact with the spindle taper.
- NOTE : Spindle nose of some solid machine spindles is not finished by grinding. Run-out of the tool will be affected if D-F-C tool is used on such a spindle. In that case, it is recommended to grind the spindle nose with a spindle nose grinding device before using D-F-C tools. Please contact SHOWA regarding usage on your machine.
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