19PM-1440BV v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Section 4 SERVICING THE LATHE
Disconnect 220V power before any maintenance operation!
Remove all machining debris and foreign objects before lubricating ANYTHING! If need
be, any oil is better than no oil – but use the recommended lubricants when you can.
HEADSTOCK GEARBOX DRAIN & REFILL
Take time to prepare. 4 quarts is a lot of oil to clean up!
1. Run the lathe a few minutes to warm the oil if necessary.
2. Open the drive train cover left of the headstock.
3. Remove the ll plug on the top surface of the headstock,
GENERAL
Aside from abrasive particles and machining debris, lack of
proper lubrication is the main cause of premature wear. Ro-
tating parts are easy to lubricate, sliding parts are not. Gibs
are tightened for the best compromise between rigidity and
slideability, which means practically zero gap between the
ways. It is not obvious which are the bearing surfaces on the
various dovetail surfaces — some of the interfaces look like
bearing surfaces, but are simply narrow gaps.
Every few hours of operation: 1. Apply the recommended way-
oil with a dedicated short-bristle brush such as the type used
for applying ux; 2. Use a similar brush to apply oil or grease to
the leadscrews; 3. Apply oil to the ball oilers, see below.
The spindle runs on sealed, pre-lubricated roller bearings re-
quiring no routine attention.
Recommended lubricants
Gearboxes: ISO 68, such as Mobil DTE Heavy/Medium circu-
lating oil. Approximate quantities required:
Headstock 4 quarts
Saddle feed gearbox 2 quarts
Apron 1 quart
Ball oilers: ISO 68 way oil, such as Mobil Vactra No. 2, or
equivalent.
Machine ways (dovetails): ISO 68 way oil, such as Mobil
Vactra No. 2, or equivalent.
External change gears: light general purpose grease, NLGI
No. 2, or equivalent.
Leadscrews: ISO 68 way oil, such as Mobil Vactra No. 2, or
equivalent.
BALL OILERS
Use a pump-type oil can, preferably with a exible spout tipped
with a soft tube. The ID of the tip should be large enough
to seat on the oiler's brass ange, more than spanning the
spring-loaded steel ball. When the oil can tip is rmly pressed
onto the brass surface oil pressure will displace the ball, allow-
ing oil to ow into the bearing. Before oiling check that the ball
is not stuck – press it lightly with a probe.
Figure 4-1.
4. Place a drain pan (2-gallons minimum) on a stool or other
support at about the height of the chip tray.
5. Fold a sheet of card stock to make a Vee-shape drain
channel. This will be pressed against the headstock below
the drain plug, angled downward into the drain pan; trim
the upstream end of the Vee so that it seals against the
headstock.
6. With the drain channel in place, remove the drain plug, Fig-
ure 4-2.
7. Allow the oil to drain completely. Replace the drain plug,
then add just a few ounces of oil.
8. When satised that the headstock is oil-tight, add oil to the
halfway mark on the sight glass, Figure 4-3 (about 4 qts).
9. Replace the ll plug.
Figure 4-1 Headsto
Figure 4-3 Headstock sight glass
Figure 4-2 Headstock
drain plug (1)
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