Author Topic: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)  (Read 40965 times)

Offline seadog

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Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Reply #800 on: March 14, 2019, 12:44:14 PM »
It would suggest that the socket hadn't been fully located before it was soldered. The pins are hardly likely to have grown, are they?  :lol:

Offline awemawson

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Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Reply #801 on: March 14, 2019, 01:38:59 PM »
Well yes they could ! It's a semi flexible structure with a heavy cable attached. I can see it happening if an operation happened to hit resonance in the cable / plug / board assembly. The socket is firmly bolted down to the PCB on stand off spacers, and presumably was so when flow soldered, so I don't think that it's a case of it not having been fully inserted as the bolts hold it fully in.

Decades ago (late 1960's) I was involved making multi-element infra-red arrays for use in spy satellites. Everything went though full spectrum vibration testing and you'd be amazed what that can do to apparently rigid structures!

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Online Will_D

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Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Reply #802 on: March 15, 2019, 07:57:07 PM »
I remember that ICL (our UK mainframe computer maker in Manchester) tested the large (0.5 x 0.5M) multi layer circuit boards as fitted into the main frame racks. They simulated lorry transport at all the different frequency.  There were some amazing slo. mo./strobe videos of the boards flexing by about 3 times their thickness. These were iirc 13 layer boards and about 6 mm thick fibre glass boards.

And yes they actually recorded the telemetry from a truck driving on roads all over the UK o run on the shaker table.
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