US796903A - Micrometer-gage attachment for lathes, &c. - Google Patents

Description

- PA'I'BNTED AUG. 8, 1905. W. A. PARRAR. MIGROMETER GAGE ATTACHMENT POR LATHES, &0. v APPL-loulou FILED n UNITED STATESY PATENT OFFICE.

WILLIAM A. FARRAR, OF WHITMAN, MASSACHUSETTS.

MICRONIETER-GAGE ATTACHMENT FOR LATHES, &O.

y Specication of Letters Patent.

Patented Aug. 8, 1905.

Application tiled March 13, 1905. Serial No. 249,876.

To all whomz't may concern:

Be it known that I, WILLIAM A. FARRAR, a citizen of the United States, residing at Whitman, in the county of Plymouth and Commonwealth of Massachusetts, have invented new and useful Improvements in Micrometer-Gage Attachments for Lathes, &c., of which the following is a specification.

My invention relates to improvements in radius-micrometers. It is designed to be used in connection with lathes, milling-machines, &c.

In the drawings herewith accompanying and making a part of this application, Figure l is a central vertical sectional view of my improved device, taken on a line passing through the center of the micrometer and its holder; and Fig. 2 is an end view of the same.

Same letters of reference refer to like parts.

It consists of a suitable holder Afadapted to be supported in a lathe o r other machine in any convenient way, as by means of sockets B, into which take the holding-points of a lathe. (Not shown.) At a convenient point in one side of the holder a recess C is formed, the bottom of the recess being substantially in line with the centering-sockets. Mounted in the holder in any convenient manner is a micrometer comprising a hollow supporting-case C and a spindle D, threaded at the top to engage a similar thread on the inside of the case C. The spindle projects downy Wardly through the case and through a guiding-nut D, which screws into the lower end of the case C, the whole being positioned so that the spindle D projects into the recess C. The holder A has an upwardly-extending tubular portion O, with one or more slits C therein. Said tubular portion is, surrounded by a-ring P, which is held in place by a set-screw P passing through the ring and engaging the external surface of the tubular portion. An annular flange R on the supporting-case C engages the upper edge of said tubu ar portion and limits the downward movement of the supporting-case in the holder.

The structure per Se of the micrometer forms no part of my invention.

In operation the holder, with the micrometer attachment, is mounted between the holding-points of the lathe and the spindle adjusted relative to the centering-points, so that the distance the spindle projects below the centering-points will equal the desired diameter of the article to be turned. The cutter-head or milling-tool having been adjusted to a position coincident with the end of the spindle, the centering-holder is removed and the article to be worked is placed in position.

My improved device is especially advantageous in lining up lathe-centers to bring them into parallelism with ways of the lathe, in determining the difference in height or detecting wear in lathe-bearings, in setting lathe-tools by micrometer measurement to turn or bore any required diameter, in lining up work on lathe-carriages, and generally in testing the accuracy of machine-tools-such as lathes, milling-machines, upright drillingmachines, &c.

Having thus described my invention and its use, I claim* A device of the character described comprising a holder having centering-sockets in the ends thereof and a recess in the side intermediate the ends thereof in combination with a micrometer-gage mounted upon said holder at right angles thereto, the spindle on the micrometer passing through the holder into the recess therein.

In testimony whereof I have signed my name to this specification, in presence of two subscribing witnesses, this 9th day of March,

WILLIAM A. FARRAR. In presence of- Gno. D. SoULE, FRANK W. BRYANT.

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