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BA sizes

Is 4BA the same as 1/4 inch hex?

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Nigel Graham 212/05/2021 15:38:51
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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.

Journeyman12/05/2021 15:53:28
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This may (or may not) help:-

ba threads.jpg

John

Michael Gilligan12/05/2021 17:42:38
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Posted by Nigel Graham 2 on 12/05/2021 15:38:51:

What typo?

The dimension is A/F (Across Flats).

.

dont know

The typo that you made when transcribing 0.248

98c7a965-de6a-4d8f-8a99-203b9ed2828d.jpeg

.

MichaelG.

JasonB12/05/2021 18:18:08
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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.

Michael Gilligan12/05/2021 19:35:40
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Posted by Nigel Graham 2 on 12/05/2021 12:17:46:

[…]

Guidance Note PD6507-1982. Does anyone know what happened to this?

[…]

.

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

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

MichaelG.

Michael Gilligan13/05/2021 21:24:13
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Posted by Nigel Graham 2 on 12/05/2021 15:38:51:

What typo?

.

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

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

MichaelG.

Howard Lewis13/05/2021 22:42:13
5036 forum posts
13 photos

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.

Grindstone Cowboy13/05/2021 23:45:04
642 forum posts
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Posted by Howard Lewis on 13/05/2021 22:42:13:

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

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

Dr. MC Black14/05/2021 00:49:17
228 forum posts
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Posted by Grindstone Cowboy on 13/05/2021 23:45:04:
Posted by Howard Lewis on 13/05/2021 22:42:13:

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

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

br14/05/2021 07:50:14
678 forum posts
2 photos

I did post earler in the  thread to say I had a spare one that was available, but offer was not taken up

bill

Edited By br on 14/05/2021 07:51:32

Neil Wyatt14/05/2021 10:25:09
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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

Dr. MC Black14/05/2021 10:56:30
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Posted by br on 14/05/2021 07:50:14:

I did post earler in the thread to say I had a spare one that was available, but offer was not taken up

bill

Edited By br on 14/05/2021 07:51:32

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

Dr. MC Black14/05/2021 11:01:11
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Posted by Neil Wyatt on 14/05/2021 10:25:09:

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

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

br14/05/2021 11:11:11
678 forum posts
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Posted by Dr. MC Black on 14/05/2021 10:56:30:
Posted by br on 14/05/2021 07:50:14:

I did post earler in the thread to say I had a spare one that was available, but offer was not taken up

bill

Edited By br on 14/05/2021 07:51:32

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

Just checked and nothing listed . So not to worry and sorry unable to help you .

bill

Dr. MC Black14/05/2021 11:26:40
228 forum posts
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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

Grindstone Cowboy14/05/2021 11:51:45
642 forum posts
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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

Dr. MC Black14/05/2021 12:40:32
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Posted by Grindstone Cowboy on 14/05/2021 11:51:45:

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

JasonB14/05/2021 13:07:20
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Posted by Dr. MC Black on 14/05/2021 12:40:32:

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!

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.

Dr. MC Black14/05/2021 13:13:14
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Posted by JasonB on 14/05/2021 13:07:20:
Posted by Dr. MC Black on 14/05/2021 12:40:32:

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!

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

SillyOldDuffer14/05/2021 13:31:12
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Posted by Dr. MC Black on 14/05/2021 12:40:32:
Posted by Grindstone Cowboy on 14/05/2021 11:51:45:
...
...

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!

...

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.

pmreceived.jpg

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

Dave

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