Horizontal Mill - 4: Arbors
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Supported Arbors are for cutters that the arbor passes completely through, position the cutter with spacers and held in place with an end-nut. Due to the length of the arbor a support is needed at the end for rigidity.

The machine and arbor must be cleaned at the time of setup for dirt and chips will damage the machine and the arbor tapers preventing the arbor from running true.

The most popular style of arbors are A and B. Both have number 40 or 50 spindle taper and are held in the spindle with a thread drawbar.

The main difference is style A has a small pilot end for support while style B is distinguish by a large support bearing collar that can be positioned close to the cutter and the arbor support to provide maximum rigidity when milling.

Other than the support bearing, both arbors are the same and come in a number of diameters ranging from 7/8 to 2½ inches. Both have keyways to prevent the cutters from turning on the shaft. In order for the cutters to be in the precise position on the shaft small spacers and spacer shims are used. To keep from bending the arbor, the arbor nut should not be tightened without the arbor in the support.

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label: Milling machine, horizontal mill, parts, fucntions, arbors