SHERLINE Center Drill Set

P/N3021

Center Drills are used with the lathe to center drill stock for mounting in
the lathe. They are designed to drill a small diameter pilot hole followed by a
60° countersink which provides a bearing surface for the 60° point of the lathe
center. Center drills are also used extensively with the milling machine to
accurately start holes. The hole locations can be dialed in using the milling
machine's calibrated handwheels. Then the hole is started using the center
drill. The large diameter shank on the center drill holds the drill point right
on center. Once the hole is started, the center drill is replaced with a drill
of the desired diameter and the hole is finished. It is imperative that a
cutting lubricant be used and the center drill is backed off several times to
prevent the tip from twisting off.

This center drill set consists of a #1, #2 and #3 double-ended high speed
steel drill. The #1 has a 1/8" shank, the #2 drill has a 3/16" shank and the #3
drill has a 1/4" shank. The tip diameter of the #1 is .047", the #2 is .078" and
the #3 is .109". Other sizes are available upon request. Return to Lathe Accessories
Section

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