Estimating Production Time of PCB Assembly Job

Predicting accurate time of your assembly job is an extremely important part production planning process. By using Sparrow ERP‘s resource managers like Operations and Workcenter every piece of equipment in your factory used in assembly process is assigned time attributes; that in turn used in predicting total time of production.

In Operation Master, time attribute of operation and sub operations can be defined. Routing which is made of multiple operations is assigned to Manufacturing order, as soon as that is done, we can estimate total time of assembly process. This gives great advantage in production planning since you know already how much time each pending job is going to take. It helps in assigning resources and man-power. It also helps in planning the maintenance activities.

A fine example of how time attribute in operation master is used is a step in Assembly called Feeder preparation.

Time estimate Feeder Preparation - PCBA

As you can see to carry out Feeder Preparation, two steps are required. First, feeder preparation itself, and second, Marking check. Estimated time to do these tasks is defined and occurrence value is “Per Bill of Material”. Occurrence indicates how frequently this operation will be performed in the process.

Setting correct “Occurrence” value is as important as setting correct estimated time. For example Feeder preparation mostly happens only once in assembly process, but Inspection happens per board. As you can see in the picture below, there are multiple type of “Occurrences”.

Occurrence Type in Time Attributes - PCBA Operation

An operation could be required to do Per PCB, Panel, BOM, CPL (SMT/TOP), CPL (SMD/BOT), CPL (BGA/TOP), CPL (BGA/BOT), CPL (QFN/TOP), CPL (QFN/BOM), CPL (FINEPITCH/BOT), CPL (FINEPITCH/TOP), CPL (MECHANICAL/BOT), CPL (MECHANICAL/TOP) etc…

Setting up these parameters is not a one time process, initial setup may give you some time unrealistic estimate due to wrong input. It will require multiple tuning efforts to set this correctly, but once it is correctly done it would give invaluable result that can transform production planning.

Following image gives you the glimpse of result of setting up correct time attributes.

Estimating operation time of PCB assembly job