When I was beginning with column drills, I discovered all the terms for the various components and also measurements actually perplexing. This short article is made to assist you if you are attempting to select a drill and also have to understand just what all the terminology and lingo methods.

Components Found on Pillar Drills

Pierce head— the assembly that makes up the chuck, spindle, drill little bit, electric motor and also pulleys.


Base— the heavy “foot” of the device that is bolted to the flooring in the case of a larger column drill or the workbench when it comes to a smaller sized bench-mounted drill.

Column— this is the upright column that offers the pillar drill one of its names (confusingly, its various other common names are “bench drill” and “pierce press”).

Spindle— the upright axle that remains in line with the drill bit and attaches the chuck to the drill head.

Chuck— the setting up that fits onto the pin and holds the drill bit.

Table— this is in some cases little bit more than a step in smaller bench drill models. It’s the assistance for the job item to be pierced, and is connected to the column some distance below the head as well as over the base. Tables can be rectangle-shaped or round, and also some can be slanted to permit angled boring with a work item. Pillar drill accessories can be purchased to secure or cradle work pieces in various angles.


Depth scale— a setup that allows the bench drill to pierce an opening part-way through a job piece.

The Meaning of Dimensions in Drill Specs

Throat distance— this is the measurement from the nearest edge of the pillar to the pin centre.


Swing— this is a common denominator of the capacity of pillar drills and is specified as twice the throat distance, or to place it one more way, the maximum dimension of disc in which you could pierce a central hole.

Spindle taper— this defines the form of the end of the spindle. There are long, short, women and male kinds. The chuck needs to work with the pin taper.


Collar Diameter— this is the external diameter of the collar or chuck assembly that holds the little bit.

Chuck dimension— this is the diameter of the internal opening of the chuck setting up, so it defines the optimum size of little bit stem that the drill could take. Because of this it is also recognized just as the boring capacity.


Spindle travel— this is the amount by which the spindle can be lowered or raised up and down and specifies the maximum depth of hole you could drill in one pass.

Maximum range spindle-to-table— this range specifies the deepest work piece that you could get onto the table.


Optimum distance spindle-to-base— this resembles the above and also defines the maximum depth of work piece you can drill with the table removed.

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