A radial drill is a large geared head drill press in which the head can be moved along an arm that radiates from the machine’s column. As it is possible to swing the arm relative to the machine’s base, a radial drill is able to operate over a large area without having to reposition the workpiece. This saves considerable time because it is much faster to reposition the drill head than it is to unclamp, move, and then re-clamp the workpiece to the table. The size of work that can be handled may be considerable, as the arm can swing out of the way of the table, allowing an overhead crane or derrick to place a bulky workpiece on the table or base. A vise may be used with a radial drill, but more often the workpiece is secured directly to the table or base, or is held in a fixture. Power spindle feed is nearly universal with these machines and coolant systems are common. Larger size machines often have power feed motors
for elevating or moving the arm. The biggest radial drills are
able to drill holes as large as four inches (101.6 millimeters)
diameter in solid steel or cast iron. Radial arm drills are
specified by the diameter of the column and the length of the arm.
The length of the arm is usually the same as the maximum throat distance.
A horizontal boring machine has its work spindle parallel to the
ground and work table. Typically there are three linear axes in
which the tool head and part move. Convention dictates that the
main axis that drives the part towards the work spindle is the
Z axis, with a cross-traversing X axis and a vertically traversing
Y axis.The work spindle is referred to as the C axis and, if a
rotary table is incorporated, its centre line is the B axis.
Horizontal boring machines are often heavy-duty industrial
machines used for roughing out large components.
A drill press (also known as a pedestal drill, pillar drill, or bench drill) is a style of drill that may be bolted to the floor. Major components include a base, column (or pillar), adjustable table, spindle, chuck, and drill head, usually driven by an electric motor. The head typically has a set of three handles radiating from a central hub that are turned to move the spindle and chuck vertically. A drill press is typically measured by its “swing”, calculated as twice the distance from the center of the chuck to the closest edge of the column. Thus, a tool with 4″ between chuck center and column edge is described as an 8″ drill press.
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