Bill,

NASA-STD-8739.4 2/98, [http://www.hq.nasa.gov/office/codeq/87394-9.pdf] has
a section on spiral wraps and "ty-wraps".
9.6 PLASTIC STRAPS

1. Installed straps shall be locked to prevent them from loosening or
opening. Straps shall be placed on both sides of a breakout; otherwise,
spacing between straps shall be as required by Table 9-1. The "ribbed" side
of a strap shall always be placed against the wires. Straps shall be
tightened so that they do not slide back and forth on the assembly; however,
they shall not be so tight as to cause noticeable indentation or distortion
of the wires in the harness. Proper strap orientation is shown in Figure
9-12.

2. Plastic straps are usually installed by tooling. Tooling shall be
tension-controlled to meet the strap-tightening requirements previously
stated. Surplus strap ends shall be trimmed flush at the back end of the
strap head (this is done automatically by most tooling).

Dave Fish

----- Original Message -----
From: "Kasprzak, Bill (sys) USX" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, February 19, 2003 9:55 AM
Subject: [TN] Attachment of ty-wraps


> Hello all,
>
> I am looking to find what others are doing with respect to tools used to
> install ty-wraps. These tools enable the user to tighten a ty-wrap then
cuts
> off the excess portion of the wrap. The tension of the tightness is a
> function of the operator to adjust the tool so that the wrap cannot slide
> back and forth when tightened but not so tight to cause noticeable
> indentation or distortion of the wire bundle.
>
> In my opinion this is operator controlled and a pre-set controlled
tightness
> value cannot be assigned for this process. If some pre-set value were to
be
> established, then calibrated ty-wrap tools would be needed. I do no think
> that these tools can be "calibrated" per se.
>
> Does anyone have experience with the controlled use of these tools for
> tightening ty-wraps?
>
> Any and all responses are appreciated. Thanks.
>
> Bill Kasprzak
> Moog Inc. Manufacturing Engineering, Electronics
>
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