21 Jun
2004
21 Jun
'04
4:41 a.m.
Steve, A good technical post on lacing.. Thanks for coming up with it.
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....
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.
Springs were streteched across the places where wires would terminate. The
wirese would then all be placed onto the board according to a wire run list
[my main job helping me father was cutting all the wires, stripping them,
and tinning the ends while I was under 10 years of age]. Once they were all
in place the harness would be laced up using the stitches Steve provided the
links to [the locking stich is a slight modification on the double running
stitch]. If everything was done right, the harness could be lifted off the
board when complete and retain its shape.
One of the items that required a "master" was the ability to build a harness
on a two dimensional board and get the slack in the wire a certain corners
to be such that the final harnes would bend into a three dimensional shape.
Damn, wish I still had tose pictures....
>> -----Original Message-----
>> From: cctalk-bounces(a)classiccmp.org
>> [mailto:cctalk-bounces@classiccmp.org] On Behalf Of Steve Thatcher
>> Sent: Monday, June 21, 2004 10:41 AM
>> To: cctalk(a)classiccmp.org
>> Subject: RE: Modern Electronics (was Re: List charter mods
>> & headcount... ; -))
>>
>> here is some info for lacing...
>>
>> http://www.hq.nasa.gov/office/codeq/87394-9.pdf
>>
>> it shows some of the stitches, etc at least. It doesn't
>> show a board layout though.
>>
>> best regards, Steve Thatcher
>>
>> -----Original Message-----
>> From: Gene Buckle <geneb(a)deltasoft.com>
>> Sent: Jun 21, 2004 10:06 AM
>> To: "General Discussion: On-Topic and Off-Topic Posts"
>> <cctalk(a)classiccmp.org>
>> Subject: RE: Modern Electronics (was Re: List charter mods
>> & headcount... ; -))
>>
>> > Were these true harnesses or were they cable assemblies. The
>> > difference being that a true harness is completely
>> assembled prior to
>> > installation [usually on a board] where a cabble assembly
>> is the use
>> > of lacing (or other
>> > methods) to "dress" simple cables [Simple in the respect
>> that they are
>> > usually point to point [2 connectors] or have few branches]?
>> >
>>
>> Does anyone have pictures of how these kind of frames were
>> built? I'm going to have to build at least two of them
>> soon for my simulator project.
>> I plan on lacing the wiring harnesses that run down the
>> side consoles since it looks so much nicer than dozens of wire-ties.
>>
>> > Did you use spot stitch, running stitches, or locking
>> stitches? I can
>> > still do a decent spot or running stitch, but struggle
>> with getting a
>> > decent [even spacing, high tension, low torsion] stitch.
>> >
>> Is there a tutorial anywhere that illustrates these various
>> stitches and where/why they are to be used?
>>
>> tnx!
>>
>> g.
>>
>>
>>