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Boring is a mass-reducing process of enlarging a hole that has already been drilled or cast. Specifications including cutting speed and removal rate should be considered when selecting an automated boring machine. Handheld tools are used for working on wood or metals and use a variety of bits to determine the size and shape of the holes drilled in the material. Chisels are hand tools for a shaped cutting edge on its end for carving or cutting hard material.
The workpiece moves parallel to the axis of rotation of the cutting tool and enlarges an existing opening in a workpiece, producing a precise internal cylindrical surface. Precision boring can also be used to straighten and enlarge existing holes by advancing the workpiece into a rotating single-point. The workpiece is held in a chuck and rotated as a boring bar with an insert attached to the tip of the bar is fed into an existing hole.
Jig boring machines use rigid, solid boring bars to create deep holes and single point tool bits for creating small holes. The machine for vertical boring is similar to lathe boring and consists of a base, a rotating horizontal work table, a column, and a cross rail.


There are several factors that can affect the results of the processing, including tool geometry, cutting speed and feed rate, rigidity of tool, workpiece, and machine, and the chip removal. The rigidity of the tool, workpiece and machine, as well as system for chip removal can also have an effect on the process results. Jig Boring produces a precise internal cylindrical surface by enlarging an existing opening in a workpiece.
Punch and chisel sets typically includes a set of tools such as pin punches, taper punches, center punches, chisels with varying sizes of blades, and a chisel punch gauge. When calculating the length of time the boring process will take, the speed, feed rate, retract rate and length of cut are the major variables to consider. The tool advances vertically and horizontally in order to control the depth and diameter of the cut produced.
The tolerance and surface finish depend upon tool geometry, environmental conditions and the alignment of machine components and fixtures.
Cutting fluid needs to be used with a jig boring machine to keep the tool cool and reduce wear.
Design Tip: Avoid boring holes that have a flat bottom because of the possibility of damaging the end of the boring bar.


Awl refers to a number of tools which feature a sharp, metal blade, often a rod with a sharp tip. Bits are held in a tool called a drill, which rotates them and provides torque and axial force to create the hole. Horizontal boring machines can be used for milling, drilling, reaming and tapping, which saves setup time when changing application. Tolerance and surface finish for vertical boring depends on the tool geometry, cutting speed and feed rate. Vertical Boring is used to produce an accurate internal cylindrical or conical surface by enlarging an existing opening. Bradawl or Pricker awl has a beveled tip and is used to make pilot holes in wood for brads and screws. Scratch Awl, Clicker's Awl, or Joiner's Awl is a woodworking tool used to mark wood for nails and screws.



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