The advanced machinist; a practical and educational treatise, with illustrations by Hawkins Nehemiah 1833-

Author:Hawkins, Nehemiah, 1833-
Language: eng
Format: epub, pdf
Tags: Machine-tools, Machine-shop practice
Publisher: New York, T. Audel
Published: 1903-03-25T05:00:00+00:00

DRILLING OPERATIONS.

A" is the rack fitted into a groove in the bracket; this rack slides loose with bracket round the pillar, and is used to raise and lower the table, the rack being confined between the collars of the pillar.

L is the bracket supporting the table ; this slides every way on pillar according to adjustment.

M shows a foot-lever actuating belt fork or guide on fast and loose pulleys for starting or stopping the drill.

N is a self-acting feed for vertical spindle D; it receives its motion from horizontal shaft through pulley O, which communicates it through a pair of spur wheels and a pair of worm wheels to a spur pinion gearing into rack ^? on sleeve Q.

O is a pulley for self-acting feed motion.

Pis a hand wheel for hand-feed attachment fixed on worm spindle ; when using the hand feed the self-acting feed can be disconnected by cam attachment.

Q is a sleeve for raising or lowering drill spindle Z>, which revolves in it.

R is a rack on sleeve.

.Sis a hand lever for quickly adjusting spindle Z>, used for hand feed.

T is a balance weight and chain to counterbalance weight of spindle Z>, drill, etc.

On page 198 is shown a wall drilling-machine; it is double geared, with self-acting feed motion, as shown in the upper portion of the illustration ; the lower part shown is the table, with an elevating screw beneath to regulate the height; these portions shown are bolted to a wall, hence the name.

The advantage of the machine consists in its portability, allowing its use in rough and temporary situations, aside from its extreme lightness.

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