Re: Vacuum forming 7K interface "covers"
Chuck Harris <cfharris@...>
My saying "*About* 1 inch by 3 inch" indicates that it was just atoggle quoted messageShow quoted text
I was giving an approximate size to eliminate any of the other parts,
particularly any "prismatic" parts, from the mix.
Since my mind's eyeball approximation isn't good enough:
Measured with my caliper, I read: 3.855" x 0.764"
It is injection molded, evidenced by mold fill marks, and a swirl
in the plastic composition where the flows occurred. It has 8
sprues, arranged in a rectangular matrix.
The plastic is white, translucent, and slippery, probably one of the
polyethylene types of plastic. The plastic is slightly unstable, as
it started to warp within minutes after my removing it from the
I don't want to burn it for further classification of the plastic,
as the part is still serviceable.
The cross sectional shape is complex in that it has special "hooks"
that retain the part. It is loosely in a class called a "C" channel.
It is not something that will be easy to make with a 3D printer of
the hobby class, as it is only 29.5 thousandths of an inch thick,
with some features that are less than 5 thousandths.
It is in the shape of an extruded solid, so extrusion would be a good,
though expensive, way of making this part, if you use the right
The manufacturer (presumably Tektronix) obviously thought injection
molding was much cheaper and easier, and probably used manufacturing
equipment they already had on hand... Plus, it eliminates a special
machining operation to cut the pieces to length.
Colin Herbert via groups.io wrote:
I thought that I knew what you were talking about until you gave the size as 1 inch by 3 inches. I am now flummoxed, because that isn't the size of the plastic parts that keep the (gold-plated) contacts in place in the backplane connector. Any chance of a photo or two?