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PTSideshow
04-26-2007, 06:26 PM
I have picked up a set of Model engineering for schools Book 1 and Book 2 By TE Haynes.
In the material list there is B.D.M.S. with no explanation of what the B.D. is as in the explanations it refers to it as mild steel. Does the B.D. have any purpose.
Also they refer to cleaning the parts in paraffin, on this side of the pond paraffin is a wax that is used to top grama's jelly,and jam jars. What would they be refering to.
The last thing is all the threads are listed as 2 B.A.,5 B.A. ect
Then some others are 5/16"B.S.F. Which I believe is British Standard fine. And all the other measurements are in inches.
I'm not to keen on the designation as the book is old school 1966
And Benny Hill, and inspector Barnaby amd Morse never coverd the above. thanks:D

halac
04-26-2007, 06:30 PM
Paraffin is what the Brits call kerosene or diesel fuel will suffice.

mklotz
04-26-2007, 06:34 PM
Paraffin is the British term for kerosene.

The following tables will help with the threads although the lousy editor will probably screw up the tabs.

British Association Closest American
Threads Threads

BA OD TPI PITCH THREAD OD
Size (in) (mm) (in)

16 0.031 134.0 0.19
15 0.035 121.0 0.21
14 0.039 110.0 0.23
13 0.047 102.0 0.25
12 0.051 90.9 0.28 0-80 0.060
11 0.059 82.0 0.31
10 0.066 72.6 0.35 1-72 0.073
9 0.075 65.1 0.39
8 0.087 59.1 0.43 2-56 0.086
7 0.098 52.9 0.48 3-48 0.099
6 0.110 47.9 0.53 4-48 0.112
5 0.126 43.0 0.59 5-44 0.125
4 0.142 38.5 0.66 6-40 0.138
3 0.161 34.8 0.73 8-32 0.164
2 0.185 31.4 0.81 10-32 0.190
1 0.209 28.2 0.90 12-28 0.216
0 0.236 25.4 1.00 1/4-28 0.250

Notes from ME-05/05/95-529 Post Bag letter by Jim Nicholson
Full series runs from 0 to 22.
Thread angle = 47.5 deg.
Crest and root radii = 0.18p (p=pitch)
Pitches are calculated as p(mm) = 0.9^n (n=number of thread in BA series)
Diameters are calculated as D(mm) = 6p^1.2
Running:

FOR N=22 TO 0 STEP -1 : P=0.9^N : D=6*P^1.2
PRINT USING "## #.### ###.# #.###";N;D/25.4;25.4/P;P
NEXT

produces:

N OD TPI PITCH
(in) (mm)
22 0.015 257.9 0.098
21 0.017 232.1 0.109
20 0.019 208.9 0.122
19 0.021 188.0 0.135
18 0.024 169.2 0.150
17 0.028 152.3 0.167
16 0.031 137.1 0.185
15 0.035 123.4 0.206
14 0.040 111.0 0.229
13 0.046 99.9 0.254
12 0.052 89.9 0.282
11 0.059 80.9 0.314
10 0.067 72.8 0.349
9 0.076 65.6 0.387
8 0.086 59.0 0.430
7 0.097 53.1 0.478
6 0.111 47.8 0.531
5 0.126 43.0 0.590
4 0.142 38.7 0.656
3 0.162 34.8 0.729
2 0.183 31.4 0.810
1 0.208 28.2 0.900
0 0.236 25.4 1.000

British Std Whitworth British Standard Fine
Thread TPI Tap Drill TPI Tap Drill
1/8 40 2.55 mm
3/16 24 3.70 mm 32 5/32
7/32 28 4.65 mm
1/4 20 5.10 mm 26 5.30 mm
9/32 26
5/16 18 6.50 mm 22 6.75 mm
3/8 16 5/16 20 8.25 mm
7/16 14 9.25 mm 18 9.70 mm
1/2 12 10.5 mm 16 7/16
9/16 12 12.10 mm 16 1/2
5/8 11 13.50 mm 14 14.00 mm
11/16 11 14
3/4 10 41/64 12 16.75 mm
7/8 9 19.25 mm 11 25/32
1 8 22.00 mm 10 22.75 mm
1-1/8 7 24.75 mm 9 25.50 mm
1-1/4 7 1-3/32 9 28.75 mm
1-3/8 8 31.50 mm
1-1/2 6 33.50 mm 8 1-23/64
1-3/4 5 39.00 mm
2 4.5 44.50 mm


speedy
04-26-2007, 06:36 PM
B.D.M.S. Bright drawn mild steel. just the old acronym for BMS?

"I'm not to keen on the designation as the bok is old school 1966"
What value do we put on education, even a retrospective one;)

aboard_epsilon
04-26-2007, 06:36 PM
BDMS.... Bright drawn mild steel....think you call it cold rolled

BSF........whitworth fine

BA ....british association ...a type of metric with different angle but metric pitch and only used for very small bolts

Paraffin is premium kerosene C1...the type you use for wick type heaters.

All the best..mark

mklotz
04-26-2007, 06:38 PM
As expected the editor screwed up the spacing on those tables. Send me your email address and I'll send you the properly formatted tables.

My email is mklotz <at> alum <dot> mit <dot> edu

PTSideshow
04-26-2007, 06:43 PM
Send me your email address and I'll send you the properly formatted tables. it is sent

And thanks to everybody that responded with the info on both sides of the pond.:D

TECHSHOP
04-26-2007, 07:14 PM
Some of the "older" books from the "lend-lease" era, have a good bit of information for cutting "their" threads on "our" machines.

I think K. H. Moltrecht's "Machine Shop Practice" has the thread info in Volume 1, plus a few other "standards" listed. Moltrect's book is a bit "dense", in that way that "old school" text books tend to be. Hell, I think that "it" may well be the last of the "old school" (pre CNC/CAD) text books.

Still, I often get confused when I read an odd issue of something printed "over there", "down under", or from "the great white north." Once when I picked up a "relatively recent (2-3 years old)" magazine, there was mention of a "John Stevenson (Nottingham)" but it was missing the "Sir sumthing of sumwhere, and sumsuch"; so I don't really think it was him...

aboard_epsilon
04-26-2007, 07:40 PM
All the info you need here

http://www.gewinde-normen.de/en/ba-thread.html


all the best.mark

PTSideshow
04-26-2007, 08:30 PM
Thanks Mark for a great site somebody on another site was asking about sewing machine threads and now I can pass the info on to them.:D

John Stevenson
04-27-2007, 04:12 AM
Still, I often get confused when I read an odd issue of something printed "over there", "down under", or from "the great white north." Once when I picked up a "relatively recent (2-3 years old)" magazine, there was mention of a "John Stevenson (Nottingham)" but it was missing the "Sir sumthing of sumwhere, and sumsuch"; so I don't really think it was him...

I'm not currently allowed to use my title here whilst the investigation into the "Cash for honours" inquiry is going on.
Mr Blair want's me to stop using it but until I get my seventeen and sixpence and my triple headed knurling tool back I refuse to.

What is the world coming to if a politician won't keep his word ?

.

ptjw7uk
04-27-2007, 08:32 AM
If memory serves - parafin is a family of compounds which vary in the length of the chain. short chain - parafin(kersene) to long chain - wax and I think very long chain hard wax.
Peter

lynnl
04-27-2007, 11:06 AM
[QUOTE
What is the world coming to if a politician won't keep his word ?
.[/QUOTE]


:D:D That's priceless!! :D:D
...now where are the paper towels? ...need to wipe the coffee and snot off the keyboard.

Tin Falcon
04-27-2007, 06:44 PM
I also have a few model engineering books from over the the pond. Have not actualy built anything frome them yet. Have been able to pretty much "tranlate" . Here in the states most metal supliers would not have a clue as to what silver steel or dural is. I also have not seen any store with the sign iron monger posted.
here is another useful link
http://shopswarf.orcon.net.nz/sindex.html
Tin

PTSideshow
04-27-2007, 07:50 PM
we have another winner folks!
Thanks another super link.