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The milling machine (horizontal or vertical miller) is set up according to the geometrical form of the workpiece, the position and size of the surface to be machined, the number of workpieces, the kind of workpiece material and the kind of milling machine available for plain milling or face milling. Mostly, the more effective milling process - face milling - is applied to milling plane surfaces. In this process higher cutting values are possible due to the employment of carbide-tipped milling tools when compared to plain milling.
Sequence of operations:
- Check the serviceability of the milling machine and lubricate it according to the maintenance schedule.- Select speed and rate of feed (nomograph or calculation) and set them accordingly. Turn the machine table to working position .
- Clamp the workpiece so that the material to be removed always projects above the highest point of the work-holding fixture. Thus, work-holding fixture and milling tool are protected against damage.
- Then, "scratching" is done, i.e. the milling cutter with running speed is brought close to the workpiece surface so that it scratches at the highest points of the surface not yet machined.
- Following, the required depth of cut is adjusted and the surface is roughly milled.
- After the machine table has been retracted to the starting position, the specified size is checked.
- In dependence of the machining tolerance still existing, the second milling operation is conducted, i.e. finish-milling of the surface is effected.
- After the finished size has been achieved, the workpiece is unclamped, deburred at the cutting edges and checked for planeness, accuracy to size and surface finish.
- When all requirements as to accuracy to size, planeness and roughness are fulfilled, all the workpieces are milled, de-burred and checked according to the task set.
- After the work order has been successfully terminated, the milling machine, milling tools, clamping and testing tools as well as the workplace are cleaned.
What is to be noted when chips are flying around?
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