By W. Bolton
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UN is in rev/min and/in mm/rev, then the distance moved in a minute is Nf mm. If L is the required length of cut then the time taken to achieve this cut is L/Nf Time for one cut =- L Nf The following example illustrates the use of the above equation. 18 mm/rev. 18 Note that in this calculation all distances are in mm and all times in minutes. 31 min In milling the cutting speed is given by V = NJJD, but an allowance called the approach distance A must be added to the length of the machined surface L m to give the total length of cut L.
However, combination tools are preferable if accurate alignment is required for the various operations. Progression tools are usually cheaper than combination tools. Progression tools may incorporate a combination tool at one station. When combination or progression tools are used, the capacity of the press has to be greater than for a single operation. The following calculation illustrates this. 70 x IO5 N When to use manipulative processes Manipulative processes are likely to be the optimum method for product production when: 1.
Ross, an Engineering Design Guide, No. 21, published for the Design Council, the British Standards Institution and the Council of Engineering Institutions by Oxford University Press (1977). Problems 1 Compare sand casting and die casting as methods for the production of a product. 2 Why is die casting not suitable for the production of small quantities of components? 3 Under what conditions would investment casting be more economic than die casting? 4 Suggest a casting process for the following situation.