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Gib adjustments
The cross-slide and compound slide on this lathe each use a long steel wedge called a gib that is positioned between
the component and its dovetailed-ways. At the end of each gib is a gib screw one of which is shown in
Figure 60.
The screws at each end of the gib oppose one another to move and hold the gib in a forward or aft position.
Depending which direction the gib is moved and held, the space between the sliding ways is increased or decreased to
control the rigidity of the cross slide and compound slide.
Before adjusting gibs, consider the lathe operation that you will perform because the cross slide and compound rest
leadscrew nuts may also have to be adjusted.
• For heavy turning and facing loads, tighten gibs for maximum rigidity, and loosen the leadscrew nuts for shock
loading protection.
• For high-tolerance turning and facing, and light-loads, loosen the gibs to allow for small slide movements without
binding or tool bit leap, and tighten the leadscrew nuts for fine handwheel control.
Most lathe operations exist between the two examples above. Finding the optimum combination for your
requirements may take practice, and trial and error before you are satisfied.
NOTICE
!
When adjusting gibs, keep in mind that the goal of gib adjustment is to remove unnecessary sloppiness
from the slide without causing binding and excessive half nut wear.
Tip:
The compound and cross slide gibs have a gib lock screw that are shown in
Figures 60-61.
This screw allows
the machinist to quickly tighten the locks to hold a gib and slide in a rigid position without having to tighten the gibs.
When finished with the need for increased rigidity, the gibs then are quickly unloaded back to their normal state by
loosening the screw.
Cross slide gib
Make sure the ways and leadscrew have been cleaned and
re-lubricated before beginning any adjustments.
To adjust the cross slide gib:
1. Disconnect lathe from power!
2. Loosen the gib lock shown
in
Figure 60
3. Loosen gib screw and adjust as required.
—to increase the slide tension, loosen the rear gib screw
1⁄8-turn, and tighten the front gib screw 1⁄8-turn.
—to decrease the slide tension,
loosen the front gib screw
1⁄8-turn, and tighten the rear gib screw 1⁄8-turn.
4. Repeat adjustments as necessary until the gib screw drag
is acceptable.
Figure 60
Compound slide gib
Figure 61
shows the gib arrangement for the compound
slide. the compound slide gib adjusts in the same manner
and with the same tools as the cross slide gib. However, in
this case, to increase or decrease tension, the gib
adjustment screw directions are reversed.
Figure 61
Page 40
Instructions Manual for AL-346V (L555D)
01/09/2017
Содержание AL-346V
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Страница 39: ... 37 Operation and Work results Page 39 Instructions Manual for AL 346V L555D 01 09 2017 ...
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Страница 51: ... 49 GEAR BOX Page 51 Instructions Manual for AL 346V L555D 01 09 2017 ...
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Страница 55: ... 53 APRON Page 55 Instructions Manual for AL 346V L555D 01 09 2017 ...
Страница 58: ... 56 COMPOUND REST Page 58 Instructions Manual for AL 346V L555D 01 09 2017 ...
Страница 60: ... 58 SADDLE Page 60 Instructions Manual for AL 346V L555D 01 09 2017 ...
Страница 62: ... 60 TAILSTOCK Page 62 Instructions Manual for AL 346V L555D 01 09 2017 ...
Страница 65: ... 63 CONTROL SWITCH ASSEMBLY Page 65 Instructions Manual for AL 346V L555D 01 09 2017 ...
Страница 67: ... 65 BED AND DRIVE ASSEMBLY Page 67 Instructions Manual for AL 346V L555D 01 09 2017 ...
Страница 69: ... 67 STAND COOLANT PUMP LAMP Page 69 Instructions Manual for AL 346V L555D 01 09 2017 ...
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Страница 75: ... 73 STEADY REST Page 75 Instructions Manual for AL 346V L555D 01 09 2017 ...