Worden Mk3 - 4-Facet Drill Grinding Jig
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 Worden Mk3 - 4-Facet Drill Grinding JigWorden Mk3 - 4-Facet Drill Grinding Jig 

Worden Mk3 - 4-Facet Drill Grinding Jig

Price:  £36.95(Inc. 20% VAT)(£30.79 Exc. VAT)

Ref:  HK1310

Compared with conventional cone ground drills, 4 facetted drills require a marked reduction in drill pressure and show a reduced tendency for even long drills to wander.

This recent design from Jim Whetren will accommodate drills from Ø3/32" to Ø1/2" (standard, countersink or flat bottomed). The clearance angles chosen for the 2 cutting lips are those used by the late Professor Chaddock, namely 30° for the first grinding then 10° for the second and final grind.