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Introduction | Safety | Milling Machines | Speeds/Feeds | Cutting Tools | Broaching | Projects | Tests

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"Milling Machines"

Milling Machine Maintenance - LubricationMilling Home

Proper lubrication of machine tools is the responsibility of the operator. In order to insure

that the machine runs properly and maintains its accuracy, regular lubrication is required.

Before operating the milling machine, make sure that all lubricants are at their properlevels. Being that all milling machines are different, it is impossible to cover the

lubrication schedule for all of the types of mills found in the machine shop. Use the charts

found below as a guide for the proper lubrication points found on most types of mills. Usethe chart to find similar lubrication points and the types of lubrication needed for the

machines in our shop. If you find that the machine that you are using is drastically

different from the machine found in the illustration, ask an instructor for the lubrication

schedule for your particular machine.
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Figure 1 Horizontal Milling Machine Lubrication

Horizontal Milling Machine

There are individual lubrication systems for themoving parts of the column, the knee and head.

Each system is provided with a sight gage to

indicate the oil level. Section 1 in Figure 1 shows

the left side view of the horizontal millingmachine. In this view you will see the oil filter

(Figure 2).

Rotate the handle of the oil filter twice each day.

Figure 2. Oil Filter.

Spindle Drive Lubrication Top

Check the oil level in the spindle reservoir by

stopping the machine and checking the level on the

oil level gage (Figure 3).

Figure 3. Spindle Drive Oil Level

Gauge
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Figure 4. Oil Flow Sight Gage.

After checking the reservoir level on the oil levelgauge, start the spindle of the machine and check for

lubrication flow on the oil flow gauge (Figure 4).

If needed, add oil to the spindle reservoir through the fillercap in the back of the machine (Figure 5). The reservoir

holds the oil that lubricates the spindle drive, the spindledrive gearbox and the pulley bracket.

Figure 5. Spindle

Reservoir Filler Cap.

Knee Lubrication Top


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Section 2 in

Figure 1

shows theleft side

view of the

horizontalmilling

machine. In

this view

you will seethe knee

lubrication

components. The knee

lubrication

system

lubricatesthe knee

drive, feed

distributionbox, feed

and rapid

traversedrive

brackets,

column andknee ways,

and theelevatingscrew. The

Filler Cap is

located just

above thelevel gauge

(Figure 1).

Figure 6. Saddle Lubrication Filler Cap, Pump and Oil Level Gauge.

This filler cap is the cap for the knee reservoir. Check the oil level in the reservoir bystopping the machine and checking the level on the knee oil level gage.

Saddle Lubrication

Section 3 in Figure 1 shows the front view of the horizontal milling machine. In this view

you will see the saddle and knee lubrication components. This system lubricates the

saddle and table-drive mechanisms, knee and saddle ways and the saddle and table ways.The lubrication system consists of a hand-operated pump (Figure 6). The pump maintains

constant pressure to the lubrication system. As the oil in the system gets used, the pump


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forces more oil to flow. The pump handle should be actuated initially until the handle no

longer reaches the bottom of its stroke. As long as the machine is in operation the handle

should not be allowed to bottom out. The reservoir can be filled through the filler cap onthe saddle.

Arbor Support Lubrication

The arbor support shown as number 4 in Figure 1 needs to have oil visible in the sight

glass whenever it is being used.

Miscellaneous Lubrication Points

There are many miscellaneous components onthe horizontal milling machine which need to beoiled by hand using filler cups (Figure 7). Filler

cups are positioned at numbers 5,6,7,8,9,10 in

Figure 1. These filler cups need to be filled

every day.

Figure 7. Oil Filler Cups.

Vertical Milling Machine Top

There are individual lubrication systems for the moving parts of the column, the knee and

head of the vertical milling machine. Each system is provided with a sight gage to indicatethe oil level.


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Figure 8. Vertical Milling Machine Lubrication

Spindle Drive Lubrication

Section 1 in Figure 8 shows the left side view of the vertical milling machine. In this view

you will see the Oil Filter. Rotate the handle of the oil filter twice each day. Check the oil

level in the spindle reservoir by stopping the machine and checking the level on the oil

level gage. After checking the reservoir level on the oil level gauge, start the spindle ofthe machine and check for lubrication flow on the oil flow gauge. If needed, add oil to the

spindle reservoir through the filler cap in the back of the machine. The reservoir holds theoil that lubricates the spindle drive, the spindle drive gearbox and the pulley bracket.

Spindle Lubrication
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Section 2 in Figure 8 shows the spindle

head of the vertical milling machine. Inthis view you will see the spindle

lubrication components. The spindlelubrication system lubricates the spindle

and the head ways. The flow and level

gauge is located on the side of the head(Figure 9). Check to make sure that oil

is visible in the gauge.

Figure 9. Spindle Oil flow and Level Gauge.

Knee Lubrication

Section 3 in Figure 8 shows the left side view of the Vertical milling machine. In this

view you will see the knee lubrication components. The knee lubrication system lubricates

the knee drive, feed distribution box, feed and rapid traverse drive brackets, column andknee ways, and the elevating screw. The Filler Cap for the knee lubrication is located just

above the level gauge. Check the oil level in the reservoir by stopping the machine and

checking the level on the oil level gage.

Saddle Lubrication

Section 4 in Figure 8 shows the front view of the vertical milling machine. In this view

you will see the saddle and knee lubrication components. This system lubricates the

saddle and table-drive mechanisms, knee and saddle ways and the saddle and table ways.The lubrication system consists of a hand-operated pump. The pump maintains constant

pressure to the lubrication system. As the oil in the system gets used, the pump allows

more oil to flow. The pump handle should be actuated initially until the handle no longer

reaches the bottom of its stroke. As long as the machine is in operation the handle shouldnot be allowed to bottom out. The reservoir can be filled through the filler cap on the

saddle.

Miscellaneous Lubrication Points Top

There are many miscellaneous components on the vertical milling machine which need to

be oiled by hand using filler cups. Filler cups are positioned at numbers 5, 6, 7, 8, 9, 10,

11, 12, 13 in Figure1. These filler cups need to be filled every day.
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Ram Style Vertical Milling Machine

The ram-style vertical milling machine,

because of its simplified construction,

has only two basic areas in need oflubrication. The head and the way

surfaces. The head of the ram style

vertical mill has two oil cups (Figure 10)

that need to be checked and/or filled

before every use.

Figure 10. Spindle lubrication for ram-style

vertical milling machines. The oil cups feed

the spindle bearings lubricant during

operation.

Figure 11. Access point for lubrication.

Another point of lubrication is at point A on

the left side of the spindle head. There youwill find a set-screw (Figure 11).


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Figure 12. Lubrication instruction plate.

At six-month intervals you will need to

remove the set-screw and grease with

lubriplate. On Bridgeport millingmachines a lubrication instruction plate is

located on the head of the machine

(Figure 12).The plate describes lubrication practices

for the Bridgeport milling machine.

Slide Way Lubrication

The way surfaces of the machine are oiled

through the lubrication pump located on the

knee of the machine (Figure 13).

The pump maintains constant pressure to thelubrication system. As the oil in the system

gets used, the pump allows more oil to flow.

The pump handle should be actuated initiallyuntil the handle no longer reaches the bottom

of its stroke. The pump should then be

actuated at four hour intervals while themachine is being used. The reservoir can be

filled through the filler cap on the top of the

reservoir.

Figure 13. Lubrication Reservoir andPump for the way slides.

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