Issue link: https://iconnect007.uberflip.com/i/976095
MAY 2018 I SMT007 MAGAZINE 49 the product CPH (PCPH) and cycle time (PCT) for the product is calculated. These are the potential of the product being produced on that line when the line running. b. The sum of the machines "Max CPH" on a line represents the line CPH. 2. Typical panel transfer time into the work nest of the SMT machine. Typical is between 2–6 seconds. 3. Typical stencil printer and oven panel to panel takt time. Product impact analysis (outputs): 1. Line constraint cycle time (LCCT) is the constraint machine cycle time. If the constraint machine on the line is a placement machine, the typical panel transfer time is added as the machine is not producing product when the panel is transferring. (Many SMT machines have the option to pre-pick components to reduce the impact of panel transfer time. The line model is configured assuming this feature is not enabled.) 2. Net CPH Loss by SMT machine (NCLM) when running that product. This represents the CPH potential lost when running a product based upon the amount of time that machine is not picking and placing components due to another constraint on the line and panel transfer time. NCLM = Net CPH loss per machine PCT = Product cycle time for a machine LCCT = Line constraint cycle time MaxCPH = Max CPH of that machine PCPH = Product CPH for that machine Figure 6: Line model computations.