Really Small Hardware

[Stuart]

Make em then you get what you want not what they think you want

EKP are very good as is model fixings

But we need studs  not chopped down set screws

Stuart

[Jo]

What would be the thread depth on something that fine?

It depends if you have ground your tool for cutting a thread with a flat crest or sharp  then you can use the old rule of thumb of threads per inch divided by 0.75 or 0.866 depending on sharp pointy tool or not. But when you get to this size it is all about making both threads match and fit  .

Marv has some software tools that will do this for you.

Jo

P.S. I remembered that Bill had been doing a little threading around: http://www.modelenginemaker.com/index.php/topic,4856.msg94029.html#msg94029

[Stuart]

250 TPI is a threading rate not surfacing. I thought the Warco machines only went down to 80 Tpi  .

Jo

Jo

I must be a bit dim today    but I thought that all lathe work cut a spiral it's just sometimes we call it a thread when it's a bit course   

Stuart

[jadge]

..............but I thought that all lathe work cut a spiral...............

Assuming the lathe turns parallel then it generates a helix, unless you want a NPT or BSPT thread.    Facing on the lathe generates a spiral.

Andrew

[Stuart]

Of course a screw is a helix     I D Ten T Stuart

So it's a course helix is a screw and a finish cut is a fine helix   

Sorry peeps I must be back in the engineering mess room today boy did we have some wind ups

Stuart

Sorry to the OP for getting your heard OT

[sssfox]

Well, I broke down and ordered 1500 stainless steel nuts from Amazon today.  Fifteen types, everything from 0-80 to 12-28 that I could find.  They weren't expensive, between $2.83 and $9.97 for a pack of 100.

I also started building a table to show all of the different dimensions.  I started with the Table at American Model Engineering Supply and expanded it.  The entries for the nuts I ordered have some dimensions listed, but they don't seem to be correct to me, based on what I know so far.  They are supposed to start arriving on Wednesday, so I can measure them when they get here.

Hopefully, from what I learn from the items I ordered and the table from American Model Engineering Supply, I can figure out what I'm doing.  At the least, I should be able to narrow the choice of bolts and screws down to two or three.

Steve Fox

[b.lindsey]

And a lifetime supply of nuts as well 

Bill

[Jasonb]

I expect all the ones you have ordered will be larger hex than American Model Eng as they are the modern mass produced ones. I too have a supply of these as they are ones supplied with various models that just look horrid so I substitute them with something more in keeping.

[Allen Smithee]

It depends if you have ground your tool for cutting a thread with a flat crest or sharp 

Cutting the external threads is easy enough; it's grinding the boring too to do the internal thread of that LH 17BA nut that gets a bit tricky...

AS

[Jasonb]

It depends if you have ground your tool for cutting a thread with a flat crest or sharp 

Cutting the external threads is easy enough; it's grinding the boring too to do the internal thread of that LH 17BA nut that gets a bit tricky...

AS

Was that a Typo ?as 27BA would be nearer to Jo's 250tpi

[Dan Rowe]

I will not buy any hex fastener for model work that does not list the AF hex size. The thread I linked is sources of model hex bolts or other small useful small fasteners.

The selection is not as good at Microfasteners but they do stock a selection of small pattern hex nuts and bolts and they do list the hex size so you know what you will be getting.

Here is the choice of small pattern SS nuts:
http://www.microfasteners.com/small-pattern.html

Dan

[sssfox]

I expect all the ones you have ordered will be larger hex than American Model Eng as they are the modern mass produced ones. I too have a supply of these as they are ones supplied with various models that just look horrid so I substitute them with something more in keeping.

I have no doubt that will be the case.  I just wanted something to use as a comparison.

[sssfox]

I will not buy any hex fastener for model work that does not list the AF hex size. The thread I linked is sources of model hex bolts or other small useful small fasteners.

The selection is not as good at Microfasteners but they do stock a selection of small pattern hex nuts and bolts and they do list the hex size so you know what you will be getting.

Here is the choice of small pattern SS nuts:
http://www.microfasteners.com/small-pattern.html

Dan

All the ones I purchased have the AF measurement listed, I just don't believe the measurements.
Here's one example for 1-64:
http://www.amazon.com/gp/product/B009EEX2G2?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s01

It lists the AF width as 3/64.
American Modeling lists hex used as 7/64 for 1-72.

I find that hard to believe.  Once I get them, I can measure for myself.
I have had no luck at all contacting any of these places in the past to get info.  They just quote what is on the site.

Am I missing something?

[Jo]

Was that a Typo ?as 27BA would be nearer to Jo's 250tpi

Sorry the standard TPI available on Mr Silky only goes down to 254 TPI i.e. 22 BA (0.37mm major diameter).

17BA is 149 1/2 TPI, but for some reason that is not a standard pitch for Mr Silky  .

Jo

[Allen Smithee]

17BA is 149 1/2 TPI, but for some reason that is not a standard pitch for Mr Silky  .

Well that'll teach you to get one of those cheap Hardinge things - get yourse3lf a proper Myford...

 

AS