pilot drill

pilot drill

[′pī·lət ‚dril]
(mechanical engineering)
A small drill to start a hole to ensure that a larger drill will run true to center.
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Pilot drill and secure two more spots on the foot before removing the clamp.
The pilot drill was followed by another low speed latch DT Removal drill that drills through the fiber post up to the post length when apical pressure is applied.
A pilot hole allows for the screw to displace less wood as the pilot drill diameter is normally the same or just a thousandths or so less than the minor diameter of the screw.
025-in tube and and patented undercut slot Packaging Sterile Sterile System components Autoclavable tray Teflon tray Pilot drill [empty Tissue punch set] 1.
The deburring process then led to further engineered improvements by using a short pilot drill to start the hole and chamfer the top of the large holes.
The company used to open the hole with a pilot drill, flame-cut the opening to leave about 1/4" of stock all around, then finish bore on a big CNC vertical machine center.
If you're replacing a peephole, place the hole saw's pilot drill about 1/2 in.
Furthermore, because of the angle at which the pilot drill and the cutter contact the pipe, deflection of the pilot drill and cutter assembly is a considerable problem, To overcome this, a pad providing a face perpendicular to the pilot drill axis was welded to the pipe prior to the branch being welded, enabling the pilot drill to maintain its central alignments.
8 x 1 -/4" Flat head wood screws for tray assembly (Use pilot drill to install)
The new Quick-Change drive arbor features a 7/16-inch hex shank and ships with a 1/4-inch pilot drill.