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     Another source is the old DFA (design for automation/assembly....)

     Boothroyd and Dewhurst developed very good models to predict assembly
     times based on the shape of the part and how it is inserted/attached.

     I believe there is a book by these two. I also know that some of the
     big consulting firms also train in this.

     B&D also have a web site.


______________________________ Reply Separator _________________________________
Subject: [TN] Manual Insertion Time
Author:  [log in to unmask]>                "Kasprzak  Bill (esd) US"
<[log in to unmask] at internet
Date:    7/10/98 7:56 AM


Paul,

Typical insertion times for components can be calculated using MTM, MOST,
etc (Note: These are acronyms for Engineered Time Standard analysis). These
methods will give very accurate results depending on what exactly you are
trying to do.

For Example, An operator seated at a bench on a slide line or paced line
reaching for a standard resistor in a bin within reach installing the part
into a PC board would result in an engineered analysis of 3.23 seconds per
insertion. Notice however, the details in the action. Note that the operator
was sitting, no swiveling, standing etc. Note that the operator had the
workpiece in front of him (her). Note that the resistor was located in an
open bin within reach. Note that the operator knew where the part was going,
no reading of prints etc etc etc. This kind of analysis can actually drive
you nuts.

However, for purposes of an approximation, the thing that you need to do is,
go out to your shop floor area. Analyze by observation the method that is
most respresentative of your standard practice, and note the number of
insertions made over a given time period. You don't need to stand with a
stop watch, this tends to aggrevate people. Just kinda glance at your watch.
You'll then get what you are looking for. For purposes of estimations I use
insertion times of 15 - 30 seconds per part depending on the part.  (Note to
Tech-Netters, don't blast me for how outrageous these times are, the times
given take into account the standard practices employed at this particular
facility.)

If you would like to discuss off-line I'd be happy to help. I will not offer
any attachments, manuals or whatever. (I cannot support an e-mail barrage
suffered by Jerry C with his "Cause and Effect" diagrams)

Bill Kasprzak
Moog Inc.
716-652-2000 ext 2507
[log in to unmask]

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