Hi,
CPH of placement machines on real jobs varies by powers of 10.
Actually nozzle changes are not the big issue if you have large panels
loaded. The machine will do all parts with the first nozzle then switch.
MyData can change nozzles in a few seconds (which is slow) and you probably
use maybe 5.
Loading boards, removing board, and resolving "Issues" takes a big hunk of
time. Setting up a job takes a big hunk of time. Running a big job keeps the
machine going but getting empty feeders replaced is an issue. Other feeder
types and trays is an issue.
If you have the ability to reload a feeder while the machine is running is
a big plus but not all machines are super smart. Lets say you have a job
that takes 2 parts from a tray and that part is a large QFP that goes down
last. Assume the current tray contain 1 part. A smart machine would pull
that one part early giving you time to replace the tray but that violates
the placement order.
In general replacing feeders while the machine is running is not something
I like. It simply is not a safe procedure in my mind.
Also, when you see some part floating around on the panel you need to stop
the machine, remove the part, and figure out where it belongs. That is a
time killer. Any exception while running a job is a time killer.
Go to some locations where someone is using the machine and sit there for
5 hours watching. That will give you a really good idea.
Bob Kondner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
Sent: Wednesday, December 02, 2009 9:18 AM
To: [log in to unmask]
Subject: [TN] Component Placement Rates
Hi Technetters,
I've looked at machine specifications that quote placement rates per
IPC9850.
How do these rates compare with actual throughput? If a machine quotes
20,000 CPH per IPC 9850, and a PCBA has 2000 components, should the
machine be able to produce a board every 6 minutes?
Obviously, nozzle changes will reduce throughput, as will layout and de-
optimziation of the placement (layout, feeder positioning, etc.).
Has anyone looked at actual performance vs. quoted performance to get a
real world estimation?
Thanks,
Blair
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