Machine hour-rate

Help correct misleading cost-accounting tenets such as e.g. economic lot sizes and machine hour rates . 

Setup time x machine hour rate plus... 

You can see that the enterprise has no loss in profit except for the hour the machine operator takes to retrofit the machine, provided he would otherwise be occupied with other value-added work or had to put in overtime. Why do we not employ the unused machine time more frequently for retrofitting Why should this time suddenly costs as much as the machine hour rate It is thus ridiculous economically to push lot sizes up through statistical non-recurring costs like the na-chine hour rate. 

We had already determined that the lot sizes cannot be calculated on the basis of machine hour rates and statistical non-recurring costs for external orders. This would result in unjustifiably high capital tie-up. 

In addition to arriving at conclusions about the nature of the production resources to be deployed, the costs of these resources also have to be gauged. Manufacturer and procurement costs have to be stated for new resources to be acquired. Machine-hour rates can be given for resources that are already in place. These figures are needed in a subsequent step for calculating manufacturing costs. 

We report on all areas of plastics processing for every kind of application—from toys to electronics and disposable packaging to automobile and appliance parts. We provide practical problem-solving assistance as well as buyers guides to new or little-known categories of machinery, raw materials, software, or services. We also provide monthly summaries of business and market news, updates on resin prices, analysis of regulatory developments that will affect our readers, and quarterly surveys of readers capacity utilization and machine-hour pricing rates. 

Capacity Definitions In any analysis, the capacity per unit time of dynamic equipment (such as conveyors and bagging machines), as well as the rates at which they ac tuaUy perform, must be defined more precisely and realistically than by a mere statement of kilograms or pounds per hour. Some useful definitions employed by the equipment industi y are the following ... 

For continuously rated machines, readings should be taken at intervals of one hour or less. For non-continuously rated machines, readings should be taken at intervals consistent with the time rating of the machine. The temperature rise test should continue until there is a variation of 1°C or less between the two consecutive measurements of temperature. 

The diesel engine, being a reciprocating machine, is mechanically complex, and in arduous environments its wear rate can be high. Major overhauls on high-speed engines are usually stipulated at 15,000 running hours, which extends to 20,000 and 30,000 on medium- and low-speed machines, respectively. 

With the selected RSM and PMD machine rates, all equipment and processes are sized to achieve the required average weekly output of 3,600 155-mm H projectiles, 1,440 155-mm VX projectiles, 720 8-inch GB projectiles, or 1,440 rockets (VX or GB) per week. If the actual average operating hours achieved during the munition processing campaigns exceed 72 hours per week, the plant would complete operations ahead of schedule. 

The economics suggest that greater savings can be realized with the lighter weight material but more money would probably have to be spent on maintenance of the heated sealing plate. If the machines can be run at 4000 units per hour, then fewer machines would have to be purchased to achieve a fixed rate of output. 

Clearly, the sensitivity of a resist should be commensurate with machine design parameters to allow optimized throughput. For example, an electron beam exposure system writing at a modulation rate of 20 MHz (dwell time of 50 nsec), a beam current of 5 x 10-8 amps at 10 kV, and an address structure (spot size) of 0.25 2 would require a resist with a sensitivity of 10 6 C/cm2 (1 / 2) or better in order to write the maximum number of wafers per hour of which it is capable. The same argument also applies to other exposure tools. 

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