The following question is one that students in SMTA Processes certification struggle with. Jim Hall and I are always a little surprised, as it is taught in the refresher class quite thoroughly and seems straight forward. See how you do. I will post the solution in a few days.
BTW, I am teaching a "Pre-Certification Class" to review the concepts required to pass the SMTA certification test on September 16, 2008 at the Concourse Hotel at the Columbus, OH airport. Come and join us if you are in the area.
The question follows:
A 7 zone oven has a heated tunnel length of 250 cm. A 20 cm PCB needs to be in the heated part of the oven for 4 minutes. What is the maximum throughput in PCBs per minute that this oven can support?
The photo is of several Speedline ovens and wavesolder machines.