JET Tools GH-1440-1 User Manual - Page 20

Headstock alignment, Removing gap bridge, Installing gap bridge

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12.7 Headstock alignment The headstock has been aligned at the factory and should not require adjustment. However, if adjustment is deemed necessary, follow the procedure below to align the headstock: 1. Using a machinist's precision level on the bedways, make sure the lathe is level side to side and front to back. If the lathe is not level, correct to a level condition before proceeding. Re-test alignment if any leveling adjustments were made. 2. From steel bar stock of approximately two inches in diameter, cut a piece approximately eight inches long. 3. Place two inches of bar stock into chuck and tighten chuck. Do not use the tailstock or center to support the other end. 4. Set up and cut along five inches of bar stock. 5. Using a micrometer, measure the bar stock next to the chuck and at the end. The measurement should be the same. 6. If the measurements are not the same and adjustment is required, loosen hex socket cap screws (A, Fig. 25) which hold the headstock to the bed. Do not loosen completely; some drag should remain. 7. Adjust two screw nuts (B, Fig. 25) located on the endgear side of the headstock. Loosen one and tighten the other. Make another cut. Keep adjusting screw nuts after each cut until the bar stock measurements are the same. Tighten all headstock screws. 12.8 Removing gap bridge 1. To remove gap bridge, locate two nuts (A, Fig. 26) in the center of the gap bridge. 2. Using an open end wrench, tighten the two nuts. This will cause the taper pins to release. Remove the taper pins. 3. Remove six hex socket cap screws (B, Fig. 26) with a hex wrench. 4. Gap bridge can now be removed. 12.9 Installing gap bridge 1. Clean the bottom and the ends of the gap bridge thoroughly. 2. Set gap bridge in place and align. 3. Remove nuts from the taper pins. 4. Slide taper pins in their respective holes and seat using a mallet. Install nuts on the taper pins finger tight. 5. Install six socket head cap screws and tighten securely. 20 Figure 25 Figure 26

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20
12.7
Headstock alignment
The headstock has been aligned at the factory and
should
not
require
adjustment.
However,
if
adjustment is deemed necessary, follow the
procedure below to align the headstock:
1.
Using a machinist's precision level on the
bedways, make sure the lathe is level side to
side and front to back. If the lathe is not level,
correct to a level condition before proceeding.
Re-test alignment if any leveling adjustments
were made.
2.
From steel bar stock of approximately two
inches in diameter, cut a piece approximately
eight inches long.
3.
Place two inches of bar stock into chuck and
tighten chuck. Do not use the tailstock or
center to support the other end.
4.
Set up and cut along five inches of bar stock.
5.
Using a micrometer, measure the bar stock
next to the chuck and at the end. The
measurement should be the same.
6.
If the measurements are not the same and
adjustment is required, loosen hex socket cap
screws (A, Fig. 25) which hold the headstock
to the bed.
Do not
loosen completely; some
drag should remain.
7.
Adjust two screw nuts (B, Fig. 25) located on
the endgear side of the headstock. Loosen
one and tighten the other. Make another cut.
Keep adjusting screw nuts after each cut until
the bar stock measurements are the same.
Tighten all headstock screws.
12.8
Removing gap bridge
1.
To remove gap bridge, locate two nuts (A, Fig.
26) in the center of the gap bridge.
2.
Using an open end wrench, tighten the two
nuts. This will cause the taper pins to release.
Remove the taper pins.
3.
Remove six hex socket cap screws (B, Fig.
26) with a hex wrench.
4.
Gap bridge can now be removed.
12.9
Installing gap bridge
1.
Clean the bottom and the ends of the gap
bridge thoroughly.
2.
Set gap bridge in place and align.
3.
Remove nuts from the taper pins.
4.
Slide taper pins in their respective holes and
seat using a mallet. Install nuts on the taper
pins finger tight.
5.
Install six socket head cap screws and tighten
securely.
Figure 25
Figure 26