Machine Maintenance

You can define each machine that makes up a work center of F type (finite capacity). Each machine is referred to by a single machine code in the work center.

A machine can follow a calendar different from the one of the work center and have its own standard yield percentage. This data is used only in the finite capacity scheduling module.

Time coefficients

A given machine can have longer or shorter run times or setup times than the standard work center times. Let us take for example a work center that groups automatic or manual machines. You may define coefficients, for each machine of the work center, that will correct the standard times specified in the routings, during finite capacity order scheduling.

Fields

Machine Id:	If the code exists, data will be displayed.
Description:	Obligatory field.
Calendar:	Calendar code respected by this machine. By default the work center calendar is proposed. This code must appear in the calendar table. If this field is left empty, it is the calendar of the work center which will be taken into account during scheduling. This enables to avoid having to modify the calendars of each machine when one changes calendar on the work center.
Efficiency Coefficient:	Standard yield ratio of the machine. This lets you determine the practical capacity of the machine (obligatory). Therefore, if one period of eight hours has been defined on the machine calendar, a yield ratio of 0.8 will result in a period of 6.4 hours on the machine’s planning.
Setup Time Coefficient:	This contains the setup coefficient to determine the setup time of a scheduled batch on the machine relative to the setup time indicated in the routing.
Run Time Coefficient:	This is the same function as for the setup time. These coefficients relative to the machine times are both used to determine the machine’s workload and the practical times of the operations during the order scheduling.
Labor Setup Time Coefficient:	This contains the coefficients of the labor setup time of the machine to determine the preparation labor time on this machine relative to the preparation time indicated in the routing.
Labor Run Time Coefficient:	This is the same function as for the labor setup time. These coefficients relative to the labor and machine times are both used to determine the labor workloads and the practical times of the operations during the order scheduling..
Breakdown capacity loss (%):	Indicate the average percentage of time wasted due to machine breakdown. It results in a loss of capacity which is taken into account in the capacity coefficient of the work center.
Mean Time Between Failure:	Indicates the breakdown frequency (average number of hours between machine breakdown).
Mean Time to Repair:	Indicates how long it takes on average to repair a machine in case of breakdown (in hours). These last two fields appear only if the Global Flow Analysis option is selected.

Buttons

There are two buttons apart from the standard buttons on the Machine Maintenance Window.

Duplicate

Duplicates the content of the window with another machine code.

When you close this window, the work center capacity and efficiency coefficients are updated as follows, respectively: the sum of the inverses of the run times ratios and the average of the machine’s efficiency coefficients.