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Materials and Tools - Materials & Tools. - More Practical Help - Your Model Railway Club
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 Posted: Tue Oct 24th, 2017 08:00 am
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Passed Driver
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Hi All.     I have been weighing up the pros and cons of screwing Kadee Couplings onto Locos etc.Self tapping screws versus drilling and tapping 2-56 threads, I have found an online supplier “Model Fixings”
but of course that means “post and packing” and more importantantly the waiting for the goods to arrive. Travelling half way around the World” in a lot of cases. But when I began work everything was simple with screws and taps(and dies)
the most common being BSW or BSF, sometimes BA, but for the life of me I don’t know what thread 2-56 is, is it metric or what. And I don’t know the length of screw I require either. Would one of you fine Modellers pleas advise me?  Best wishes. Kevin



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 Posted: Tue Oct 24th, 2017 09:14 am
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Sol
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Use Kadee screw 2-56 https://kadee.com/htmbord/page256.htm
you can cut to length

http://www.votawtool.com/product_help/Thread_Sizes.asp



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 Posted: Tue Oct 24th, 2017 01:41 pm
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Hi Ron.  Thank you for your reply.  The Kadee reverse tweezers arrived in the post today from Perth WA, as I said half way around the World. I will look at your suggestion .  Best wishes. Kevin



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 Posted: Wed Oct 25th, 2017 03:04 am
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Hi Kevin,

2-56 is a "Unified Thread Standard" used in the US, normally for machine screws. The 2 refers to the major diameter, in this case 0.086" or 2.18mm, 56 refers to the number of threads per inch. The equivalent in metric land is an M2 x 0.45, which in UTS is 2mm diameter and 56.5 threads per inch.

Small self-tappers have a coarse thread and work fine as long as a hole is first drilled with a diameter less than the self-tapper is used. Rather than being expelled, the plastic expands and if thin enough will split unless drilled. The screw needs to be long enough to go through the gear box and into the base material.

I use #2 x 1/4" pan head self tapping screws or Kadee #256 nylon insulating screws (also pan head), 1/2" long, which can be cut to length, and which don't interact with magnets.

Nigel




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 Posted: Wed Oct 25th, 2017 07:13 am
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Hi Nigel.   Thank you for your reply. With all the explainations sitting in front of me, I can understand it. But as soon as I am not looking at it, my mind can only think of “British Stanard Whitworth (BSW) “ the regular Screws that I was brought up with.:nice New threads sounds like a suit of clothes? The reason for this question being, the track cleaning device from Lanarkshire Model Supplies uses self tapping screws, but that must have been for cheapness?I am still looking for a supplier, but it seems impossible to avoid the dreaded eBay and waiting an Eon for the goods to arrive, and when they do, the chances are that I am out of the house? Best wishes. Kevin



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 Posted: Mon Oct 30th, 2017 09:09 am
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Sol
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Passed Driver wrote: Hi Ron.  Thank you for your reply.  The Kadee reverse tweezers arrived in the post today from Perth WA, as I said half way around the World. I will look at your suggestion .  Best wishes. Kevin

Dunno know why you purchased them from Australia?
https://kadee.com/htmbord/page1020.htm

as they are in stock in the UK
http://www.gaugemaster.com/item_details.asp?code=KDE1020



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 Posted: Mon Oct 30th, 2017 12:29 pm
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Passed Driver
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Hi Ron.   Dapol L & Y Pug coupler question in email.   Best wishes. Kevin



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 Posted: Sat Nov 4th, 2017 09:33 am
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You must be older than me Kevin ...................when I was a lad, we had BSF, BA, AF or Whitworth - no "British Standard" Whitworth .................... :cheers



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 Posted: Sat Nov 4th, 2017 09:47 am
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Hi Petermac.  Thank you for your kind remarks. My first job on leaving school in 1962 was in a small engineering factory in South London. And that is where I used BSW and BSF screws with the occasional BA screw , but ,definitely no metric screws. There was one job that had opposing adjustment screws, one with a R/H thread and one with a L/H thread.   Best wishes.  Kevin
PS the secret is “Daylight Lighting “ that shows up any errors



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 Posted: Mon Nov 6th, 2017 08:22 am
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I left school in 1969 and started my apprenticeship as a Plant Mechanic and my first set of tools were Whitworth.One of the jokes played on the new lads by the old boys was to go to the stores for some 1/2 " Whitworth flat washers amongst others.



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 Posted: Mon Nov 6th, 2017 08:30 am
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Hmm, I'm not as old as I thought really, as I've just had to acquire Whitworth tools to work on something much older than me!

Ah, the old flat washer routine lives on. Sweet :)

Bill



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At 6'4'', Bill is a tall chap, then again, when horizontal he is rather long and people often used to trip over him! . . . and so a nickname was born :)

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 Posted: Mon Nov 6th, 2017 08:59 am
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Hi Alan.  Thank you for your reply.   Jokes? What about going to the stores for the “Long Weight/ Wait”?The store keeper was a bit fed up with that one.  Best wishes. Kevin



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 Posted: Mon Nov 6th, 2017 09:06 am
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Hi Bill.  Thank you for your reply.  They knew how to make tools back then, “Moore and Wright “ made my micrometer, very handy for when model makers quote “thousandths of an inch” but the shop uses millimetres . Best wishes.  Kevin



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 Posted: Mon Nov 6th, 2017 10:34 am
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Hi Nigel   This is a second reply. Some “ years ago?” I purchased a cheap/made in Taiwan wire multi tool, with a Cutter and a Crimper, and something that I only recently discovered “5 tapped holes” designed for cutting electrical screws to the correct iength without damaging the threads, and it works. Wouldn’t that be handy for BAscrew threads.
Just a thought.   Best wishes.  Kevin



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 Posted: Mon Nov 6th, 2017 12:23 pm
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Passed Driver wrote: Hi Alan.  Thank you for your reply.   Jokes? What about going to the stores for the “Long Weight/ Wait”?The store keeper was a bit fed up with that one.  Best wishes. Kevin

And don't forget the bubble for the spirit level and a tin of tartan paint and sky hooks.Good old days eh?



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 Posted: Tue Nov 7th, 2017 07:54 am
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Hi Alan.   Good old days indeed! Back then I had control of both my Eyesight and fingers and thumbs. Now I have to wear Spectacles and I am all fingers and thumbs. So why can I not assemble Kadee Couplings ?? I sometimes wish that it was 1965 again as far as my dexterity and eyesight are concerned . Best wishes. Kevin



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