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close this bookSetting-up and Operating of Horizontal or Vertical Milling Machines - Course: Techniques for Machining of Material. Trainees' Handbook of Lessons
View the document(introduction...)
View the document1. Purpose and importance of milling
View the document2. Types and design of milling machines
View the document3. Preparation for setting-up and operation of horizontal or vertical milling machines
View the document4. Setting-up and operation of horizontal or vertical milling machines
View the document5. Maintenance and servicing of milling machines

5. Maintenance and servicing of milling machines

Like any other machine, milling machines are subject to wear and tear. The physical wear is a result of the use of the machines and of the abrasion caused by friction during use. Such wear can be reduced by regular maintenance and servicing of the milling machine by the operator:

The degree of wear depends on:

- maintenance and servicing of the milling machine,

- properties of coolants and lubricants,

- environmental conditions (dust, temperature variations, etc.)

-operating conditions (single or multi-shift operation, volume of metal removed, proper operation).

Servicing cycle of milling machines:

Kind of servicing work

Interval

1. Cleaning of guideways

daily

2. Inspection of oil level (sight glasses)

daily

3. Lubrication as per lubrication chart

as per instructions on lubrication chart

4. Oil renewal

semi-annually/annually

5. Inspection and, if necessary, refilling of coolant tank

weekly

6. Thorough cleaning of the machine

weekly

7. Inspection of slackness of bearings

annually

8. Inspection of electrics (contactors, limit switches, cable connections)

every 3 months

9. Inspection of lubrication pump

semi-annually

10. Coolant renewal

semi-annually

For lubrication of a machine the following basic rule applies:

The specified lubricant is to be applied to the relevant lubricating point in the specified quantity and at the specified time!

It is absolutely necessary to observe the safety regulations for setting-up and operation as well as for maintenance and servicing in order to avoid accidents and interruptions of the production. Any defects found at the lubricating points of the milling machine are to be reported to the serviceman in charge. Repairs, particularly on the electrics, control elements and lubricating points, must be done by authorized specialists only.

For handling and storing lubricants, coolants, etc. the respective fire protection regulations (such as “no smoking” within 5 m; flash points of oil and grease) are to be strictly adhered to in order to prevent fire.

For setting-up, maintenance, servicing and repair work on the milling machine the main switch must always be in “OFF” position - danger of accidents!

What can be done to reduce the physical wear of the milling machine?
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What is to be observed for handling (storing and using) oil and lubricants?
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What is the basic rule to be observed for setting-up, maintenance and servicing work in the interest of labour safety?
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