US 4,218,941 AGranted

Method and tool for machining a transverse slot about a bore

OwnerRobert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Manuel A. David-Maliginventors

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Abstract

A method and apparatus for cutting a transverse slot about a bore of smaller diameter than that of the slot are disclosed. The invention consists of introducing a cutting head facing transversely to the bore, through the bore opening its distance from the mill shaft being progressively extended by the addition of spacers between the head and the shaft until the desired slot depth is obtained. The spacers are held in position by a cable passing from the cutting head through the series of spacers and out along the mill shaft. The mill shaft carrying the cutting head is moved transversely into the object wherein the slot is being cut as the object is being rotated thereabout by the mill table to which it is affixed.

Claims7

Dependent claims

A method for machining a transverse slot of first dimension through a bore of second dimension being smaller than said first dimension comprising the steps of:

(a) providing an object to be machined having a bore of said second dimension;
(b) providing a cutting tool having a cutting head and being insertable into said bore of said second dimension;
(c) providing a tensioning means for urging said cutting head toward said tool;
(d) providing a plurality of spacers insertable between said cutting head and said cutting tool;
(e) applying said tensioning means to affix said head to said tool;
(f) positioning said cutting tool in said bore;
(g) rotating said object to be machined about the longitudinal axis of said bore;
(h) moving said cutting head transversely into said object being rotated to cut a transverse slot in said object about said bore;
(i) ceasing rotation of said object upon said shaft contacting the wall of said bore;
(j) releasing said tensioning means and moving said cutting tool away from said cutting head;
(k) inserting at least one of said plurality of spacers between said cutting head and said cutting tool;
(l) applying said tensioning means to affix said cutting head and said at least one of said plurality of spacers to said tool;
(m) rotating said object to be machined about the longitudinal axis of said bore;
(n) moving said cutting head transversely into said object being rotated to deepen the slot being cut transversely about said bore;
and
(o) repeating steps (i) through (n) until said slot is cut to said first dimension.

13 more elements

Dependencies are inferred from the claim text.