21 Jun
2004
21 Jun
'04
5:21 a.m.
The fan out can become an issue. The springs were typically light weight and
were stretched enough to snuggly hold one wire between each coil. Back then
connector densities were not that high, so it was common to see a leg which
split into 2-3-4 tails to handle the physical connectors. When larger
wuantities were involved, it sometimes bacame necessary to make the wires
over-long and then trim (strip and tin) the ends after removing from the
board.
You could use some craft type paper, or do it on the computer and generate
the output to a large format plotter. Not sure where you are based, but here
in the US, most Kinko's can print a large format sheet for a somewhat
reasonable price.
>> -----Original Message-----
>> From: cctalk-bounces(a)classiccmp.org
>> [mailto:cctalk-bounces@classiccmp.org] On Behalf Of Gene Buckle
>> Sent: Monday, June 21, 2004 1:03 PM
>> To: General Discussion: On-Topic and Off-Topic Posts
>> Subject: RE: Modern Electronics (was Re: List charter mods
>> & headcount... ; -))
>>
>> > Gene, Unfortunately my fathers log books (which included
>> photos of
>> > nearly every harness (type) he ever built as well as an 8mm movie
>> > showing construction of one over time, were
>> lost/destroyed about 15
>> > years ago [apparently "climate controlled" on a storage
>> unit does not
>> > exclude over 2 feet of water on the floor during spring melt....
>> >
>> Damn. I would've loved to have seen that.
>>
>> > The typical method was to design the harness
>> (schematically) and then
>> > create a blue print [I love the smell of ammonia!] at 1-1
>> size. This
>> > print would then be adfixed to a board (typically
>> plywood). "Nails"
>> > would be driven through the blueprint into the board at
>> all corners, angles, junctions, etc.
>>
>> I might be able to do something similar by drawing the
>> wiring layout on some kraft paper taped to a plywood base.
>> What kind of spring would be used? I suspect you'd go
>> after one with enough turns to hold all the wire, but at
>> some point you'd end up with a huge "fan" of wires if the
>> spring wire diameter were too great.
>>
>> g.
>>
>>
>>