Re: 2901 Time Mark Generator Case Fixings
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Hi Bob
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Many thanks for your reply, the pliers you describe are what we call
circlip pliers in the UK but I suspect the 7000 series fittings are different as
those pliers wouldn't work for what I'm trying to do.
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I've created an album in the group photos area called "2901 Time mark
Generator" and have uploaded a drawing?to that showing the 2901 covers and
fittings.
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On this version of the drawing, item 115 is the countersunk securing pin,
item 116 is the dished serrated spring washer, item 117 is the plastic index
plate, and item 118 is the locking plate that I need to latch into a
groove?at the end of the pin.
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My problem is the amount of force that's required to compress item 116,
I've tried supporting the head of the pin and pressing?down on the locking
plate with a nutdriver that fits over the inside end of the pin?but it just
won't press down far enough to allow the locking plate to slide into its groove
and I'm concerned that the amount of force I'm having to apply is going to
damage the cover around the fitting, especially if I slip.
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Next up I'm planning to try?a couple of nutdriver heads from a socket
set, one pressing on the outside of the countersunk pin and the other over the
inside of the pin pressing against the locking plate as before, but this time
I'll try compressing them either in a vice or using a G-clamp, which hopefully
will allow better control and reduce?the risk of applying pressure to the
cover.
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It's just getting really silly, I keep thinking I'm missing something but
what I've got exactly matches the drawing and there must have been an assembly
tool for this, there's no way these latches could have been assembled in a
production environment without one.
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Regards
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Nigel
GM8PZR
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In a message dated 26/02/2013 18:00:37 GMT Standard Time,
rgwood@... writes:
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I am on the
road and cannot provide pictures until the weekend. The case rings/locks on
7000 series boxes sounds very similar to what you describe.
??
In that
case, I modified a standard set of ¡°snap ring¡± or ¡°C-ring¡± pliers *at least
that what I learned to call them *. They are pliers that in one setting the
jaws compress the c-ring to place it internal to a shaft. The other position
they expand to open the ring on the outside of a shaft.
In any
event they work good to push the tab under the slot with very little if any
downward force. I¡¯ll send pictures this weekend if needed, Hopefully the
description gets you started.
Hopefully
helpful
Thanks as
always for the bandwidth.
Rob
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From: TekScopes@...
[mailto:TekScopes@...] On Behalf Of
poldhu1901@...
Sent: Tuesday, February 26, 2013 5:37
AM
To: TekScopes@...
Subject: [TekScopes] 2901
Time Mark Generator Case Fixings
?
I'm sure this
is?could turn out to be a very silly question,
BUT.......
Some time
ago?I bought a 2901 that was?quite grubby and?removed the top
and bottom cover "twist to lock" fixings in order to clean?beneath
them.
So far so good,
and all cleaned up nicely, but I've yet to find a way of getting them back
again that isn't likely to cause damage to the covers!
The fitting
method is simple enough in principle, the locking "lever" drops over a slotted
shaped end to the locking "screw" and then slides into place to hold the whole
thing together against the tension of?a dished serrated?compression
washer?that sits under the countersunk "s crew head", but there's so
little give in those compression washers that any attempts so far have risked
putting sufficient?pressure on the quite thin aluminium covers to damage
them.
This is a
similar sort of arrangement to the cover fixings on the old 500 series scopes
etc but I recall those as being bigger and never causing this sort of
aggravation. I'm sure there must have been other small TEK cases with these
fasteners, and there has?to be a quick and safe way of fitting them, but
I'm wondering now if there was some kind of shaped tool that compressed the
fitting from either side without putting pressure on the surrounding
metalwork.
Any thoughts
would be much appreciated.
As an aside,
for anyone who might be interested, I found some nice internal photos of the
2901 here....
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