Tools and patterns by Dowd Albert Atkins 1872-

Author:Dowd, Albert Atkins, 1872-
Language: eng
Format: epub, pdf
Tags: Machine shop practice, Tools
Publisher: New York, Industrial Extension Institute

VERTICAL BORING MILL FIXTURES

227

FIG. 101. PLAN AND SECTION OF EXPANDING ARBOR AND PACE PLATE FOR VERTICAL BORING MILL

the center hole. The work is placed in position over the central plug and drops down against the surface, A, of the fixture. A split ring, G, similar to the type described under the heading " Split King Expanding Arbor," Chapter XIII, is then expanded by means of the bolt, H, thus giving the desired centering action. The spring jacks, K, are now released and allowed to spring up against the surface, D, after which they are locked by means of the set-screws, L. The final clamping of the work is accomplished by means of the hook-bolts, M, which are operated by the bolts, N.

The principle shown in this fixture can be applied to a great variety of work, and it can be adapted to suit different conditions, both as to the means of clamping and as to the points on which the work is located. Any method of clamping applied to a fixture which has been previously machined must take into consideration the fact that no distortion can be permitted. The use of springs and spring jacks for this purpose is common. Care must be exercised that when the set-screws are tightened they will not force the jacks out of position.

Vertical Boring-Mill Fixture for a Fragile Aluminum Casting.—One of the most difficult examples of a fixture for holding a piece of thin work of irregular shape, and machining it when held without causing distortion in the work, is shown in Figure 102, at A. In the plan above, it will be seen that the casting has a thin flange of approximately elliptical shape and the face of this flange is to be machined in the setting indicated. In addition to this the face,

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