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Machine Time Glossary

 

Machine Time
Machine Availability – Machine availability is expressed as a percent of the scheduled operating time during which a machine is not under repair or service. In other words, it is the percentage of the scheduled operating time during which the machine is mechanically fit and is itself capable of doing productive work. It is expressed by scheduled operating time minus mechanical delay time divided by schedule operating time and multiplied by 100.
Machine Down-Time – Time during which a machine cannot be operating in production or auxiliary work because of breakdown, maintenance requirements, or power failure.
Machine Utilization – Machine utilization is expressed as a percentage of the scheduled operating time that is productive time. It is computed by productive time divided by scheduled operating time and multiplied by 100.
Scheduled Non-Operating Time – Time when no production is scheduled for a machine.
Idle Time – Scheduled non-operating time during which a machine is not working, moving, under repair, or being serviced.
Out-Of-Shift Repair Time – Part of non-operating time during which a machine is actually undergoing repair. Waiting time is not included here as in the in-shift repair time element.
Out-Of-Shift Service Time – Part of non-operating time when a machine is actually undergoing service time. This does not include waiting time.
Scheduled Operating Time – Time when a machine is scheduled to do productive work. Time during which a machine is on standby as a replacement machine is not considered as scheduled operating time. When a machine is replaced, the scheduled operating time of the replaced machine is considered as ending when the replacement arrives on the job. Scheduled operating time of the replacement commences when it starts to move to the location of the machine it is replacing. Extension of the regular shift operation into overtime is considered as scheduled operating time.
Operating Time – Time during this period can be either productive or delay time. Delay time is the sum of disturbance time, service time, and repair time.
Mechanical Delay Time – Part of scheduled operating time spent in repair or service during which a machine cannot work. It does not include replacement of oil filters and spark plugs as scheduled in a preventative maintenance program. Servicing is fueling, lubricating, and doing the work specified in a scheduled preventative maintenance program. When a machine is being serviced while under repair, the time involved is to be classified as repair time, not service time. Repair and service time occur in both scheduled operating and non-operating time.
In-Shift Repair Time – Part of mechanical delay time when a machine is actually undergoing repair plus the time during which a machine is waiting to be repaired or for repair parts, mechanics, or facilities. This is the same as repair time.
Active Repair Time – Time during which actual repair work is being carried out on the machine itself or a dismantled part of the machine.
Repair Time – Sum of active repair time, waiting repair time, and time spent servicing the machine while undergoing repair.
Waiting Repair Time – Time during which the machine is waiting for a mechanic, spare parts, or repair equipment. This includes time for transporting the machine to and from the workshop.
In-Shift Service Time – Part of mechanical delay time when machine is actually undergoing service plus the time a machine is waiting for service parts, mechanics, or repair facilities. This is the same as service time.
Service Time – Time for normal service and maintenance.
Non-Mechanical Delay Time – Part of scheduled operating time during which a machine is not doing productive work for reasons other then repair or service. This time may be subdivided by causes; weather or terrain conditions, waiting for another phase of an integrated operation, assisting other machines, and operator talking with visitors.
Disturbance Time – Examples are: time spent for logging down, towing, detail planning, talking to supervisor, waiting for wood, and waiting for better weather.
In-Shift Moving Time – The part of non-mechanical delay time during which a machine is moving or being transported. Includes the time taking to move or transport the machine between operating sites or between camp and site, assuming the machine is not under repair service. It does not include time spent moving between adjacent working positions on any one site.
Operational Lost Time – Time during which production is halted due to things such as operating conditions, non-availability of auxiliary equipment, or using the machine in a non-productive manner to assist other machines.
Personnel Time – Part of non-mechanical delay time in which a machine lacks an operator or any other member of the machine crew.
P.M.H. – Productive Machine Hour
Productive Time – Part of scheduled operating time in which a machine is performing a function for which it was scheduled. Also, time spent in carrying out the task; the sum of actual productive and other productive time.
Actual Productive Time – Time spent using the machine to carry out the actual task.
Other Productive Time – Time when the machine is carrying out tasks other than those for which are intended.
S.M.H. – Scheduled Machine Hour
Total Time – Total elapsed time for the period under consideration; total time for a period of 1 week is 168 hours (7 days multiplied by 24 hours per day).