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For Machines Mfg. Since 7/09 EVS Toolroom Lathes
-73-
SERVICE
A portion of the lathe bed directly under the
spindle, the gap insert (Figure 150), can be
removed to create additional space for turning
large diameter parts.
The gap insert was installed, then ground flush
with the bed at the factory to ensure precise fit
and alignment. Therefore, if the gap insert is
removed, it may be difficult to re-install with the
same degree of flushness and accuracy as when
installed at the factory.
Gap Removal &
Installation
2. Remove the two way end cap screws and way
set screws shown in Figure 151.
3. Tighten the two dowel pin jack nuts (Figure
151) until the pins are pulled free from the
gap insert.
4. Tap the outside of the gap insert with a dead
blow hammer to loosen, then remove it.
To re-install the gap:
1. Use mineral spirits and a clean lint-free rag
to clean the mating surfaces of the gap, bed,
and ways. If necessary, stone the mating
surfaces to remove scratches, dings, or burrs.
2. Wipe a thin layer of light machine oil on the
mating surfaces.
3. Place the gap insert into the gap and use a
block of wood or dead-blow hammer to align
the insert with the lathe bed.
4. Back off the dowel pin jack nuts, and tap the
dowel pins back into their respective holes
until seated. This process will further help
align the gap insert and bed mating surfaces.
5. Install all fasteners (except the way set
screws) and lightly snug them in place.
6. Mount a base-mounted dial indicator to the
top of the saddle to indicate alignment. First
test the peak of the two prisms the saddle
rides on, then test the flanks of the prisms.
Jack the insert up or down by tightening or
loosening the gap bed cap screws.
7. Alternately tighten the fasteners and tap the
side of the gap insert into alignment.
8. Inspect the gap position 24-hours later to
make sure the gap is still aligned, adjust
if necessary, then install the two way set
screws.
Figure 151. Fasteners holding gap in place.
Gap Bed
Cap Screw
Way End
Cap Screw
Way Set
Screw
Dowel Pin
Jack Nut
Tools Needed: Qty
Hex Wrenches 4, 6, 8mm .............................1 Each
Wrench 17mm .......................................................1
To remove the gap:
1. Remove the four gap bed cap screws, shown
in Figure 151, that secure the gap insert to
the bed.
Figure 150. Gap insert that can be removed from bed.
Gap Insert