twist drill


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twist drill

[′twist ‚dril]
(design engineering)
A tool having one or more helical grooves, extending from the point to the smooth part of the shank, for ejecting cuttings and admitting a coolant.

twist drill

A drill, with one or more helical cutting grooves; used for drilling holes in metal, wood, etc.
References in periodicals archive ?
After the twist drills are grinded out with the designated different angles, the main drill point angles are measured for each twist drill as proposed by Kim and Zou [22]; the measurement values of the drill point angles are shown in Table 1.
HSS twist drill registers a high value of thrust force.
Scott Allison, president of MTD Acquisitions, says his group intends to operate Minnesota Twist Drill and continue to serve its customers.
One of the first points to be made regarding the annular tool is the fact that it is a cutter, where twist drills are part cutting tool and part chisel.
Step drill: Two or more diameters may be ground on a twist drill to produce a hole with stepped diameters.
For example, manufacturing a twist drill from a hardened blank requires five basic operations: 1) centerless grinding, 2) flute grinding, 3) OD clearance grinding, 4) point grinding and 5) split point grinding.
A unique secondary process utilizes a twist drill to drill a 90 degree lubrication hole in four parts simultaneously, intersecting with the 23.74" deep hole; a post-drilling inspection provides continuous gaging to assure that the two holes intersect.
The twist drills used for most types of drilling were the first adapted to the task.
Now able to cover the 61- to 81- mm diameter range, ISCAR's (www.iscar.com) DR indexable twist drills are optimized for use on all steels, alloys and cast iron.
It stores dozens of special drill point geometries in memory, and sharpens HSS, cobalt, and carbide 2 flute twist drills with diameters from 1/8" to 5/8".