BA thread mnemonic

I am sure that I remember being taught that:

All Boys Can Eat Good Jam Leaving None

would always remind me of BA thread sizes.

But I cannot remember why.

ANy other victims of 1960s trade training who can help?

Not directly, but this forum might shed a little light on your query;

**LINK**

Regards

Bill

What am I trying to remember?

JA

Sound's like a way of remembering which letter drills to use for something, but all too large for BA.

Neil

Found it: A; 6 BA. B; 4 BA. C; 2 BA. E; 1/4" BSF. G; 5/16" BSF. J; 3/8" BSF. L; 7/16 BSF. N; 1/2" BSF.

I have not figured out the tie up between the letters, and the thread sizes, I'll leave that to someone else.

Ian S C

Reminds me of the southern part of a canal in east London ,BOW LOCKS written large in white letters on a wharehouse wall in the 1970s

Aren't they clearance, from memory E is 1/4"

Roy

Yes, but that's the only one!

Russell

I've always found it easier to remember the actual sequence ,rather than the daft rhymes. Colours of the rainbow etc.

I thought "All Boys Can Eat Good Jam Leaving None" might be a Google-whack, but no. The other entry ays:

Another Mnemonic for you.
"All Boys Can Eat Good Jam Leaving None"
Relates to bolt sizes used on British made aircraft.
(When we made aircraft that is!!!)

I'm still none the wiser.

Dave (Who should be working)

Hm ... original post was in the first hour of April 1st ....

.

Oh Ye of little Faith !!

Table 11 in this document gives the sequence: **LINK**

http://scribd-download.com/download/module-06-b1-notes_588c7bf76454a73d0835c224_txt

The mnemonic is just a mnemonic

MichaelG.

Further to Ian's post:-

Aircraft bolts were / are(?) designated by a letter and length code independent of actual thread size and type. Not all letters are used. That mnemomic gives the letters corresponding to the first few valid aircraft bolt sizes in the old BA-BSF system. As tabulated by Ian.

I imagine the missing letters were assigned to sizes that aren't, in practice, used. Possibly the system is used in fields other than aviation and some of the missing letters, and associated bolts, may be used. Probably done that way to ensure that ordinary bolts didn't get slotted into aircraft installations which frequently had both higher than standard strength requirements and closer fits.

Clive

For those who might be wary of following the link that I posted earlier; I have here quoted the specifically relevant text, verbatim: ... The formatting is a little challenging, but the information is there.

MichaelG.

.

Note: In the earlier UK system (which may be encountered on older, or homeconstructed, light aircraft), bolts more than ¼ inch diameter are normally BSF, whilst bolts less than ¼ inch diameter (and most screws) are BA. Both of these items also use a number to represent their nominal length and a letter code (as can be seen in Table 11) to identify their diameter. Other bolts of this era may have nicks at the corners of the head (High Tensile Steel) or a raised ring on the bolt head (Cold Rolled) to assist differentiation of their particular designations. Table 11 EXAMPLES OF BA AND BSF BOLT AND SCREW CODES
Code Size Code Size

A B C E G J L N

6 BA
4 BA 2 BA 1/4� BSF

5/16" BSF
3/ 8" BSF

7/16" BSF 1/2" BSF

P Q S U W X Y Z

9/16" BSF 5/8� BSF 3/4" BSF 3/4" BSF 7/8" BSF 1" BSF 12 BA 10 BA 8 BA 8 BA

Does anybody remember this one?

"Some People Have Curly Black Hair Though Partly Bald"

.

Almost ...

My Dad taught it to me as:

"Some People Have Curly Brown Hair 'Til Practically Bald"

... which is near enough the same [and both are true].

MichaelG.

Edited By Michael Gilligan on 02/04/2017 08:11:27

On the subject of aircraft bolts this incident with a BAC 1-11 windscreen comes to mind

**LINK**

Some People Have Curly Black Hair Through Perpetual Brushing. That's when the opposite was perpendicular. Colin

Martin, a very interesting report. In my time in the hanger 8-32 bolts/screws were not freely available, they were not to be used in structural areas, 10-32 being the minimum size, and this was on light aircraft, although we did go up to DC-3.

It doesn't help when the aircraft windscreen is built inside out, relying on the strength of the bolts alone to hold a 60lb windscreen in place. From my working with parts from USA, the windscreen would come with the correct bolts ready for fitting.

Ian S C