BA sizes

What typo?

The dimension is A/F (Across Flats).

It's rare you need know the full diameter of a hexagonal fixing unless making them from round bar.

This may (or may not) help:-

John

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The typo that you made when transcribing 0.248

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MichaelG.

Nigel, there is no difference in the hex sizes between metric coarse and metric fine.

Metric coarse fixings are available from a number of sources with smaller A/F and taller nuts to better represent period fixings and are used by those of us who like to work in metric and care about how out models look. These are typically fully machined heads and nuts with single chamfer and no strength spec formed on the bolt heads.

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Nothing much ... It is still ‘current’ and available to buy: **LINK**

https://shop.bsigroup.com/ProductDetail?pid=000000000000099975

MichaelG.

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Bumping this, in the hope of attracting Nigel’s attention

... it would be good to tidy-up the thread.

MichaelG.

The BA thread is basically Metric. (Originally Swiss, I believe )

Starts at 6 mm x 1 mm pitch (But NOT M6 because of the different thread form, 47.5 degrees as opposed to 60 degrees for Metric threads ) with thread pitch decreasing by a factor of 0.9, as shown in the tables above.

The spanner size shown in the tables above decreases by a factor of approximately 0.88, varies very slightly from size to size..

Cromwell Tools offer open end BA spanners, so maybe they offer nut spinners also?

If you can find a capscrew which fits your 4BA nuts, you could always make your own by fixing it into a screwdriver handle.

Maybe more readily and cheaply available

Howard.

They do, but they're a bit expensive.

Links to https://www.cromwell.co.uk/shop/hand-tools/nut-spinners/7-pce-ba-nut-spinner-set/p/KEN5569520K

Rob

Zoro sell the same nut spinners at around £2.50 each - see: **LINK**

But they are out of stock on the 4BA size - which is what started me on this topic.

I live in hope that somebody will be offering a 4BA nut spinner at a comparable on Ebay. In the meantime, I can use a 1/4" screwdriver bit handle having started the nut on the thread so the magnet doesn't take control!

Very many thanks for all comments

MC

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If you have a six-jaw chuck, you can use it to press tube around small nuts to form your own spinners.

Use bored-out and annealed tool steel and they can be hardened and tempered for long life.

(Not my tip, I read it in one of the mags years ago - note that six jaw chucks can usually grip very small diameters).

Neil

Very many thanks for being persistent

I hope that I have sent you a message OFF LIST (but I have little faith in computer technology!)

With best wishes and thanks again.

MC

Thank you for taking the time to respond -- but I don't have a six jaw chuck.

I have never seen them advertised for the Taig/Peatol Lathe.

MC

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Dear Bill

I have tried sending another message using the "Message Member" link

I don't understand what I've done incorrectly.

I have spent a long time trying to find a link to the messages that I've sent - but there's only a tab marked INBOX.

With best wishes and thanks again.

MC

If you click on the "Inbox" link (on the green bar at the top of the page), you'll be taken to a page where all you incoming messages are displayed. However, you will also see there a link for "Sent Box". If you click on that, you will be able to see whatever you have sent.

Rob

Thank you for taking the time to respond.

It's unintuitive to have to look for SENT messages in the INBOX - but I fund them.

Does everybody know how to find messages sent to them? It would be a lot easier if they just arrived in one's email client!

With best wishes and thanks again.

MC

You can set the system up to send you an e-mail notification of messages, just go to settings on the green bar and then select my account . Second item down is a box to tick for notification. You also get the flashing icons on the website when you have a message waiting.

Thank you

But rather than receive a notification that there's a message, it would be far simpler if the message just arrived in my INBOX and to which I could reply by email.

Your view may differ!

With best wishes and thanks again.

MC

Though they look similar Private Messages aren't emails. The word 'Private' reveals their main advantage. Only members can exchange PMs, and only the Forum administrator and addressees can read them.

PMs are much more contained than emails, which use a store and forward mechanism to route stuff across the many different servers and interconnected networks than comprise the internet. Store and forward means multiple copies are taken, and - even worse - the global nature of email means spam! On the plus side, email is more capable than PM because it allows attachments and other bells and whistles.

The software used by this forum isn't particularly friendly when it comes to PMs in that the facility is behind a menu (Inbox tab, top left) and not everyone realises it exists. When a PM is received the items ringed in red below flash, and the message ringed in blue appears in the Friends pane.

From the Inbox a tick box sends an email notification whenever a PM is received.

Dave