The Shop > Tools
Ye Olde Screwplate
Bluechip:
--- Quote from: vtsteam on May 25, 2015, 04:47:54 PM ---Anybody got an idea what system or period (or country) these gauges and pitches relate to?
1 through 5 gauge are 28 tpi pitch
6 through 9 gauge are 32 tpi pitch
10 through 12 gauge are 37-1/3 pitch
13 and 14 gauge are 42-2/3 pitch
1 gauge seems to measure about .260" ID
5 gauge seems to measure about .202" ID
10 gauge seems to measure about .136 ID
14 gauge seems to measure about .107" ID
The above die hole ID's would be approximately the minor diameter, so the actual gauge diameter would be larger.
--- End quote ---
This is Standard Wire Gauge
http://www.clag.org.uk/swg.html
Some of it 'sort-of' fits if it's the minor diameter, bearing in mind there are several other UK wire gauges. I'll see if I can find a table. have it somewhere.
Birmingham Wire Gauge, Stubs, etc ... no wonder we poor Limeys are always baffled ... :loco:
Dave
Edit
OK. So I have :
Imperial Standard Wire Gauge
Instrument Wire Gauge
Twist Drill Wire Gauge
Warrington Wire Gauge
Whitworth's Wire Gauge
Stub's Steel Wire Gauge
Birmingham or Stub's Iron Wire Gauge
Birmingham Gauge for Sheets and Hoops
Birmingham Wire Gauge for Silver and Gold
English Music Wire Gauge
.... and Uncle Tom Cobley and all .... your choice ... as I'm skint I suggest we can drop the Silver & Gold Gauge ...
Also have AWG but I suppose you've tried that one ??
Dave
vtsteam:
Dave, thanks for all the references. My eyes are going buggy after looking through various charts and sources tonight. This chart seems pretty good:
http://www.dave-cushman.net/elect/wiregauge.html
I'm thinking the closest match seems to be Washburn & Moen gage -- especially at the low number end of the scale. The highest number on the plate, 14, doesn't seem to fit any of them, since the minor diameter I measured is larger. However I could easiy be off in measurement, as all I have is a caliper, and the jaws don't even fit in the hole. Even then, the W&M gauge is closer than some of the others.
I looked up Washburn and Moen: https://en.wikipedia.org/wiki/Washburn_and_Moen_North_Works_District
and they were located only 85 miles away from here in Worcester, MA, and the vendors at the Bernardston, MA show might even have come from Worcester. Coincidentally, my father-in-law graduated from Worcester Polytech, which was founded by Ichabod Washburn.
So it seems at least a good possibility that this was a Washburn and Moen Screwplate, possibly even originating in Worcester, MA where the wire company was located.
pitch:
I do still wonder about the two weird fractional pitches -- why in the world were they chosen?
re. usefulness:
It might be fun to make a few taps to match, by running some turned drill rod through the screwplate in some useful small sizes, and then fluting and hardening -- as I did for the acme tap I made.
Fergus OMore:
I'm unable to dig into my records because of having imminent medical checks away from home!
However, I suspect that the odd pitches are metric. Very old metric weird stuff out of Europe or possibly Europe émigré out of Europe. Anyway, with luck, I shall try to dig out my old copy of Machinery( 1942 edition) to see what it contains.
My hasty view is that they are probably watchmaking and clock stuff- which came out of places like Besancon which is next door to- would you believe- Ornans where Vernier lived! Been to both, my son studied there.
Cheers
Norman
RussellT:
--- Quote from: vtsteam on May 25, 2015, 10:12:23 PM ---why in the world were they chosen?
--- End quote ---
So that future users will curse :bang::bang:when they've lost the screw and can't find a replacement. :lol: If you want to be remembered fondly don't give into the temptation to actually use them. :D
Russell
Fergus OMore:
--- Quote from: RussellT on May 26, 2015, 04:06:05 AM ---
--- Quote from: vtsteam on May 25, 2015, 10:12:23 PM ---why in the world were they chosen?
--- End quote ---
So that future users will curse :bang::bang:when they've lost the screw and can't find a replacement. :lol: If you want to be remembered fondly don't give into the temptation to actually use them. :D
Russell
--- End quote ---
But this is exactly what people do. Myford has a spindle nose which is a standard UNF or UNC size but this thread is BSW i.e. 55 degrees not 60!
Then there are BA's which are- dammit- Metric/Imperials.
As I said to Simon- let's go metric and-- head for the little men with white coats and a straitjacket.
Then- if history is to be quoted( not again, Norm) Lord Nelson's navy had bloody big heads on bolts- 'cos the matelots twisted the heads off anything smaller.
Seriously, screw threads were struck and made by hand and eye and the world had to wait until our Mr Maudsley came along. Not Mr Whitworth as written by the other Norman Atkinson.
Yea, yea
Norm
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