Firstly
I find it amazing that none of us would have a bar of buying stolen BSA parts or offer any support to those who do steal them
Yet we are quite happy to indulge in property thieft on line.
The footage is a small part of a 15 minute long newsreel about BSA owned by British Pathe' who spent a small fortune digitizing it so we can enjoy it
So Matt is nothing more than a thief peddleing stolen goods on Face book for his own greedy personal gain thus depriving British Pathe' of internet traffic which of course will discourage them from digitizing other BSA material they hold so we can enjoy it .
The entire 15 minutes should be available from British Pathe
https://www.britishpathe.com/video/b-s-a-factoryAnd I think it was originally released digitally back in 1999 and has been linked to in this forum before .
Now as to the small section of content Matt the thief posted without any acknowledgement of the owners .
BSA batched parts manufacture was done in batches
They were made on production lines by process workers, not highly skilled machinists
As they came off the machine they were graded using go / no-go gauges
The parts were then stamped according to the gauge that they fitted so when assembled they could be married to the parts that gave the best fit.
These are all those tiny little stampings we see all over our engines and cause so many ulcers to owners who can not accept that they have no special meaning.
And this has been done to death on here as well .
Those of you who have done any machining know that tools get blunt or get a build up if you are machining alloy.
This changes the actual dimensions of EVERY part so no two are actually identical thus the need to gauge & match parts.
Then there is the heat effect
The length of seel to be machined into axels dragged into the unheated factory in the middle of winter will be very cold and thus SMALLER.
If machining does not generate enough heat to expand the steel to ambient temperature the finished axel will be the correct size when it is -5 C outside but oversize when at + 40 C in my shed .
As the tools get hotter they get longer so machine undersize till the wear is equal to the expansion .
Now days machining is done by a computer which controls the movement of the tooling while monitoring for tool wear & temperature variations in real time and makes real time adjustments .
Back then nothing happened till Polly the process worker noticed that too many parts were out of gauge so she hit the stop button which signalled for Tom the toolsetter to come & make djustments to the machine or sharpen the tooling & readjust to suit .
If yo make the effort to find the complete version, which starts out with some employees at the BSA picnic day then goes on to show what each person does in the factory note how the pistons are wound up into the barrels at 100 sets an hour .
One of the early jobs for the mill when commissioned will be to make some of those piston clamps
