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Itsy Bitsy Teenie Weenie Threads ?
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 Posted: Sat Aug 11th, 2012 08:36 am
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hicountryscratcher
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Hah, thought I couldn't spell bikini didn't ya ? or are most of ya-all too young to get it ?

One of the problems I have run into many times is not being able to find small enough screws to hold some model together. 

Finding any hardware much smaller than 00/90 is darn near impossible, not to mention EXPENSIVE ! 

00/90's are about a buck each and the 000/120's I saw once were outrageous!! 

There is a solution --- I bought this set a few years ago, but had not seen them for sale anywhere again till now. 

The set is on E Bay.

Take a look at what I am talking about. 

This set will both make internal and external threads as small as .7 mm-- thats about .020 !! It goes up to 2 mm thats .078 
 
I have made little bitty nuts by drilling .062 brass, tapping it with the .7 mm and filing it into a a square or a hex configeration and cutting a it off the parent rod.
 
I have also threaded .020 brass rod, and by using one of the nuts I made soldered on the end, made a little bitty bolt out of it! 

This kit is about 20 some odd bucks.

I am sure happy to have mine -- take a gander, no hobby shop I have ever been in has anything like it.


http://www.ebay.com/itm/190572470531?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649


 Dave

















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 Posted: Sat Aug 11th, 2012 05:26 pm
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Herb Kephart
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 Hah , thought I could not spell bikini didn't ya? or are most of ya-all  too young to get it?

I gots yeller spots before my eyes.

That is what the Brits call a "screw plate" I believe

A fellow that I know built a "running" 1/7th size Rolls Merlin V12 aircraft engine The homemade 24 sparkplugs (downfall of the project--although he wouldn't admit it) were 6-32 where they screwed into the heads, and at the top end were threaded 000-120. He bought a tap to thread the nuts, but made a set of chasers for a Geometric die head to thread the male top of the plug.

Not many here are machinists enough to know what a feat making the chasers were--but 120TPI is a smidge over 8 thousandths from one thread to the next---.008333~" to be semi exact. each of the four cutters had to have the threads
.0020833 out of register with the preceding one. Done on a 6x12 surface grinder with a very fine, very hard wheel.
The connecting rod bolts were much easier--they were
00-90, and he was able to buy commercial chasers for them.

The plugs were a failure BTW, because you cant scale down electroons--and it was easier for the spark to jump places other than where it was supposed to.

Good find on the kit of taps!

Herb 

 



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 Posted: Sat Aug 11th, 2012 08:38 pm
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Bernd
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It's not on e-bay anymore.

Darn, looks like I'll have to make my own.:sad: :bang::bang:

Bernd

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 Posted: Sat Aug 11th, 2012 11:22 pm
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Herb Kephart
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I think that 0-80 is the smallest that they carry--but I have bought from---

http://www.microfasteners.com/index.cfm

They sell 100 for what it costs for 10 at the LHS


Herb 





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 Posted: Sun Aug 12th, 2012 01:16 am
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hicountryscratcher
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Bernd I just checked , It IS still there .
Try this link and see.  It does work somehow I messed it up the first time--I edited the first post so it will work now too. 

   Dave

http://www.ebay.com/itm/190572470531?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Last edited on Sun Aug 12th, 2012 01:19 am by hicountryscratcher



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 Posted: Sun Aug 12th, 2012 01:27 am
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hicountryscratcher
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Herb Kephart wrote: I think that 0-80 is the smallest that they carry--but I have bought from---

http://www.microfasteners.com/index.cfm

They sell 100 for what it costs for 10 at the LHS


Herb 


  I have as well Herb, 0-80 is not too hard to find and I would rather buy them instead of going to the trouble to tap and thread --besides the set I have ( and the one o E Bay) is metric so it is a horse of a different col--- --- wait -wait  --a screw of an odd pitch! 

      Sorry to hear about your friends Merlin engine --did he ever get it running?

 

   Dave





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 Posted: Sun Aug 12th, 2012 01:32 am
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Bernd
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Works now Dave.:2t: Thanks.

I buy from Microfasteners also.

Bernd

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 Posted: Sat Apr 20th, 2013 07:21 am
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Tramcar Trev
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I know a guy who makes steam engines that run (and a re perfect scale models, he built a triple expanding marine enging that's around 30mm long and 25mm tall) but are so small they use a glass thimble as a display case. He makes his own nuts, studs and bolts he uses some very very small stock 1mm brass hex and phosphor bronze wire for studs....
All to much for me, but I admire his skill and patience...



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 Posted: Sat Apr 20th, 2013 12:19 pm
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Bernd
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Here's an example of what Trevor is talking about.

http://www.craftsmanshipmuseum.com/Kieffer3.htm

It states that his threads are .0005", yes that's five ten thpusands of an inch deep.

Bernd

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 Posted: Sat Apr 20th, 2013 01:33 pm
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mwiz64
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I just bought a set..... thanks!



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