APRON
MECHANISM IN LATHE
Apron Mechanism:
Apron is
attached to the carriage and hangs over the front side of the lathe bed. It is
useful in providing power and hand feed to both carriage and cross-slide. It is
also used to provide power feed to the carriage during thread cutting through
two half nuts. The construction of
apron is shown in Fig.
Construction
Power is
transmitted from the spindle to the lead screw and feed rod through the spindle
gear and tumbler gear arrangement. A worm is mounted on the feed rod by a
sliding key. The worm meshes with a worm gear on whose axis another gear G1 is
attached. Gear G1 is attached to a small gear G2 by a bracket as shown in the
diagram. Gear G4 is positioned to be in mesh with the rack gear always. Another
gear G3 is mounted on the same axis of gear G4. The carriage hand wheel meant
for longitudinal feed is attached to the gear G5 on the same axis. The gears G3
and G5 are always in mesh. The gear G6 is attached to the cross slide screw.
The feed
selection lever can be kept in neutral, up and down positions to obtain the
following movements.
1. Hand feed
and power feed to the carriage
2. Hand feed
and power feed to the cross slide
Hand feed to the carriage
Feed
selection lever is kept in neutral position and the carriage hand wheel is
rotated. The gear G4 attached to the rack gets rotation through the gears G5
and G3. The carriage moves longitudinally.
Power feed
to the carriage
When feed
selection lever is kept in up position (U), the gear G2 will mesh with gear G3.
Gear G4 gets rotation through gear G3 and the carriage gets automatic (power)
feed.
Hand feed to
the cross slide
Feed
selection lever is kept in neutral position. The cross slide will move on
rotation of the cross slide hand wheel.
Power feed
to the cross slide
When the
feed selection lever is kept in down position (D), gear G2 will be in contact
with gear G6. The rotation of G6 will make the cross slide screw also to rotate
and the cross-slide moves automatically.
Power feed
to the carriage for thread cutting
When the two
half nuts in the apron are made as one unit, lead screw makes the carriage to
move automatically and cut threads of required pitch value.
REFERRED BY :- ER. MANDEEP KANDHOL (A.P.), MECHANICAL ENGG. DEPTT., SGI
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Hi sir, How cross slide works with power feed?
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