Imperial Nuts & Bolts

[VicParticipant @vic]

Always seem to look nicer to me than metric ones. It must be the proportions? Is there some kind of formula that dictates the ratio between the various dimensions?

I ask, as at some point I’d like to make some large decorative nuts and bolts in wood with my new jig.

Failing some technical data from the web provided by Michael 😊, I’ll have to sit down at my Mac and draw some samples to see what looks nice!

I’ll be making Hex bolts but I’d sure like to know how the socket was made in this socket screw!

[bernard towersParticipant @bernardtowers37738]

If its a really good piece of hardwood (which it looks like) it could possibly be rotary broached.

[JasonBModerator @jasonb]

It’s a lot easier to clean out the corners of a routed hole in a piece of wood with a wood chisel than it is a metal one with a cold chisel

Did not get the knurling right , looks like it is recessed again with a router rather than raised.

Should be easy enough to find a chart with the spec for the nuts and hex heads for your chosen imperial form. 1.6 x D looks good to my eye.

[Vic]

On 31 December 2024 at 11:15 Vic Said:

Always seem to look nicer to me than metric ones. It must be the proportions? Is there some kind of formula that dictates the ratio between the various dimensions?

I ask, as at some point I’d like to make some large decorative nuts and bolts in wood with my new jig.

Failing some technical data from the web provided by Michael 😊 […]

You could always search this forum !

… I have remarked many times previously about the differing proportions

Three hints for YOUR search

Unbrako

DIN

IKEA

Yes, I’m very tired … having not slept at all last night.

MichaelG.

[bernard towersParticipant @bernardtowers37738]

You should take more water with it Michael!

[Michael GilliganParticipant @michaelgilligan61133]

Ha bloody Ha !

[Michael GilliganParticipant @michaelgilligan61133]

Sorry, Bernard

… sense of humour failure

MichaelG.

[Bill PhinnParticipant @billphinn90025]

Vic, I’d be interested to see some pictures of your jig. Is it intended just for wooden screws?

I have over a dozen bookbinding presses that have wooden screws. All the presses except two are over sixty years old, a couple of them well over a hundred years old.

The reason I mention them is that all the screws are much coarser threaded than the ones shown in your picture. Two of the finishing presses I have, for example, have

1 1/4” diameter screws but pitches of 4 and 5 threads per inch. Off the top of my head 1” BSW is 8 TPI.*

I don’t think the coarser thread is there entirely for reasons of speed (in loosening and tightening the presses); I think the coarser thread is probably more forgiving of movement in the wood through changes in humidity.

My only direct experience of finer threads on bookbinding presses (though not as fine as on the examples shown) is of the two newish presses I own. These were made new for me (one using very old timber that was already a press, and one using new, though supposedly well seasoned, beech) around twenty five years ago.

The threads on both of these presses began to jam after around a year and had to be remade. Obviously the degree of slop manufactured into the threads is a factor in whether the threads will jam as well.

Michael, the world is divided into two sorts of people: those who sleep, and those who don’t. Bernard is clearly one of the first.

 

* And 1 1/4” BSW is 7 TPI.

[old martParticipant @oldmart]

I think the 10.9 grade marking on the SHCS is somewhat optimistic.

[VicParticipant @vic]

Hi Bill, I don’t think the jig I bought would be of any use to you as it’s generally only for producing short threads.

https://www.hopewoodturning.co.uk/product/hope-easy-set-threading-jig-with-hinge-plate/

There are some YouTube videos of the jig in use.

[bernard towersParticipant @bernardtowers37738]

Bit of a sense of humour  lobotomy going on hear, all the best for 2025!

[Martin ConnellyParticipant @martinconnelly55370]

B.S. 1083:1965

There are images of the dimension tables on the web.

Martin C

[Bill PhinnParticipant @billphinn90025]

It all becomes clear, Vic: those threads are for woodturners making things like lidded pots, where a fine thread is more acceptable and high loads aren’t involved.

[VicParticipant @vic]

Yes, exactly. I’ve got two spindles, the 16 tpi works well for small boxes. I also have a 10 tpi which should do nicely for some wooden “bolts”. You can also get 8 tpi and M3.5 for duplicating the threads on lathe spindles to make your own face plates etc.

 

Martin. Thanks for the picture, I’ll search for the table.

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