A-A-55017 Mandrels, Machine, ExpandingThis commercial item description \(CID\) covers expandable mandrels which are used for supporting workplaces between centers for machining operations.

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INCH-POUND

A-A-55017A

7 November 2011

SUPERSEDING

A-A-55017

21 May 1992

COMMERCIAL ITEM DESCRIPTION

MANDRELS, MACHINE, EXPANDING

The General Services Administration has authorized the use of this commercial item description for

all federal agencies.

1. SCOPE. This commercial item description (CID) covers expandable mandrels which are used

for supporting workplaces between centers for machining operations.

2. CLASSIFICATION. Unless otherwise specified in the acquisition order (see 7.1), the mandrels

shall be classified by the following sizes:

2.1 Size. See table I.

3. SALIENT CHARACTERISTICS

3.1 Design. The mandrels shall be a cylindrically shaped tool consisting of a solid arbor having a

specific taper over the major portion of its length and one or more expanding sleeves with an inside

taper which fits the tapered portion of the arbor. The arbor shall be centered on each end with a

milled flat on one end for a holding device. When the sleeve is moved along the length of the arbor,

it shall contract or expand as determined by the location on the arbor. The plane of the outside

surface of the sleeve shall be parallel with the horizontal center line of the arbor. The mandrels

shall be similar to figure 1.

3.2 Tolerance and finish. The arbor centers shall be machined to a standard angle of 60 degrees �

30 minutes. The surface roughness average (Ra) of the arbors shall be not greater than 20

microinches using a 0.030 inch cutoff when measured in accordance with ASME B46.1. The

maximum allowable runout shall be not greater than 0.001 inch total indicator reading at the grind

diameter. The sleeves shall be finished internally to fit the arbor and shall provide uniform

expansion to any size in the range of diameters listed in table I.

Comments, suggestions, or questions on this document should be addressed to Defense Supply

Center Philadelphia (DSCP), ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia, PA

19111-5096 or e-mail to dscpg&inspecomments@dla.mil . Since contact information can

change, you may want to verify the currency of this address information using ASSIST Online

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