Resource time

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Diagram: Breakdown of operating resource time according to REFA

The resource time is the sum of all target times for a resource when executing an order. If the resource time is related to a work cycle, it is called the resource base time ( ). The basic resource time is in turn calculated from

the main usage time (or main time)
the secondary usage time
the fallow period
use Main use Reason
Punch the flange The time in which the press stroke of the punching machine places the punch on the workpiece and until the punching slug is pressed through the workpiece Punching is defined as the process of shearing a tool punch through a die. Only this time is considered the prime time.
Sweep the floor The time a broom spends sweeping, i.e. only when dust is moved in the desired direction. Only when dust moves in the desired direction is the purpose achieved.
Roll sheet metal The entire time that sheet metal passes between the rollers In the case of continuous processes, the main time is the largest proportion of use

The secondary usage time is the designation for the necessary time shares that do not carry out the planned function.

use Secondary use Reason
Punch the flange The time that the press ram moves down to bottom dead center after piercing the workpiece, the stroke time until the punch reaches top dead center again, the time to remove the punched flange and insert an unpunched blank, press the start switch and the movement of the stamp until it is placed on the workpiece. ... so most of the usage time.
Sweep the floor The time in which the broom is brought into position in order to be able to perform its function; so all rotations and backward movements. Since the broom must be returned to a position where it can perform its function, it is inevitable to perform these movements, but these movements will not achieve the purpose of the exercise.
Roll sheet metal The rolling mill during set-up, repairs and maintenance. Continuous processes rarely have idle times in the process. However, all downtimes that are planned or unplanned for operation count as non-productive times.

The idle periods are all those periods of time during which the equipment is not used for any reason - lack of material , lack of orders or lack of workers; So when the broom is in the corner because the floor is clean (lack of material), nobody gave instructions to sweep (lack of order) or the operator has a break (lack of workers).

Individual evidence

  1. REFA Association for Work Design, Company Organization and Corporate Development e. V. (Ed.): Selected methods for process-oriented work organization . Darmstadt: REFA, 2002. Page 233 f.