Southbend Turn-nado Gearhead Lathe w/ Dro 21" x 60" sb1046pf - Manual (Page 80)

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For Machines Mfg. Since 3/11 Turn-Nado ® Gearhead Lathes S E R V I C E
After a long period of time, you may find that
the leadscrew develops a small amount of end
play. This end play can be removed with an easy
adjustment.
Tools Needed: Qty
Open End Wrench 36mm or 1 7 ⁄
16
" ........................1
Hex Wrench 3mm .................................................1
To remove leadscrew end play:
1. DISCONNECT LATHE FROM POWER!
2. Loosen both retaining nut set screws (see
Figure 113).
Leadscrew End Play
Adjustment
3. Engage the half nut lever.
4. Rotate the carriage handwheel to move
the carriage back slightly, then tighten the
retaining nut at the same time until the end
play is removed.
5. Tighten both set screws to secure the setting.
Gib Adjustment
The goal of adjusting the gib screws is to remove
sloppiness or "play" from the ways without over-
adjusting them to the point where they become
stiff and difficult to move.
In general, loose gibs cause poor finishes and
tool chatter; however, over-tightened gibs cause
premature wear and make it difficult to turn the
handwheels.
Important: Before adjusting the gibs, loosen the
locks for the device so that the gibs can freely
slide during adjustment, then lubricate the ways.
The gibs are tapered and held in position by a
screw at each end. To adjust the gib, turn one
screw 1 ⁄
4
turn clockwise and the other screw 1 ⁄
4
turn counterclockwise, so both screws move in
the same direction and the same amount. Test
the feel of the sliding component by turning
the handwheel, and adjust the gib screws as
necessary to make it tighter or looser.
The gib adjustment process usually requires
some trial-and-error. Repeat the adjustment
process as necessary until you find the best
balance between loose and stiff movement. Most
machinists find that the ideal gib adjustment is
one where a small amount of drag or resistance
is present, yet the handwheels are still easy to
move.
Figure 113. Leadscrew end play adjustment.
Leadscrew
Set Screw
(1 of 2)
Retaining
Nut