Nut sizes imperial measurements, disorientation!

This topic has 31 replies, 17 voices, and was last updated 28 February 2023 at 00:33 by Nigel Graham 2.

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27 February 2023 at 12:11 #635241
Howard Lewis
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@howardlewis46836
Drain Rod threads appear to be Whit form, 7/8 or 3/4" ( From poor memory A While since i made an "unstopper" using broom handle and the rubber disc, for our daughter )

Howard
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27 February 2023 at 13:45 #635253
Nigel Graham 2
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@nigelgraham2
Yes: Drain Rod Threads are 7tpi BSW form! I can't recall the diameter without going and dragging them out to measure, but I don't think it's as large as 7/8" .

How do I know?

I made parts for a pump for a caving application, with a drain-rod section as its piston-rod / handle. It starts a siphon to drain a short "sump", a pool totally filling the passage with water, like a sink-trap.

I turned a brash bush with male thread, to fit the plastic piston that works in a short length of 150mm PVC drain-pipe. Calculating the wheels for an EW lathe with 20-65 X 5T change-wheels, two-stage only and 1/8" lead screw, was interesting.

'

I used that lathe too as a 2-axis dividing-head for drilling about 130 holes in a plastic tube for the pump's inlet strainer: using a hole through a brass block in the tool-post, to guide the bit in a small battery-drill. Workpiece between centres.

Fibre-tip pen marks on the 60T change-wheel on the spindle as angle indicator sighted against a headstock feature on the headstock as their "pointer"; similar but separately on the lead-screw for lengths. Guide-block against the work as angular brake, normal saddle lock for lengths.
27 February 2023 at 18:24 #635284
bernard towers
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@bernardtowers37738
Drinks bottle threads?
27 February 2023 at 19:07 #635287
Bdog507
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@bdog507
Good evening all.

The thread I had in mind is the Schrader valve thread. Invented by a German in the USA…..Says it all really!

Cheers.

Stewart.
27 February 2023 at 19:23 #635289
JasonB
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@jasonb
Is it Unique though as there are several different sizes of the Vg thread form and the common tyre size Vg8 is just a 60deg 32tpi thread

I would have said threads like Edison, plastic bottle and glass bottle forms are fare more unique in shape though again have several size options

Edited By JasonB on 27/02/2023 19:26:28
27 February 2023 at 19:41 #635290
Bdog507
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@bdog507
Good evening all.

As far as I know there's nothing else that uses it. Bloody Yanks!

Indeed bottle threads are very unique in form, and there are considerable variations. Think how many times a day bottles get unscrewed vs how many tyres are pumped up. I wouldn't like to be the chap who had to count them!

Cheers.

Stewart.
28 February 2023 at 00:33 #635310
Nigel Graham 2
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@nigelgraham2
My candidate thread in all our homes and probably operated by more people than is the tyre-valve thread, is that used on glass jam-jars:

A rounded-top, flat-bottom profile, multiple-start breech-thread; i.e.perhaps 4-start but cut through to give a quarter-turn action for a female thread that is no more than tabs!
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