Really Small Hardware

[Dan Rowe]

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.

They have messed up the listing. Small Parts used to be a good source of parts until Amazon gobbled them up and have no idea what they are selling.

3/64" is .0469 and a #1 screw is .073" OD. It is going to be a bit tricky to drill the tap hole in that nut. They obviously mean 5/32 AF and 3/64" thick.

If you are looking for 000-120 0r 0000-160 go here:
http://jimorrisco.com/miniature-screws-and-fasteners/miniature-screws.html
They even have chasers for Geometric die heads for those sizes but the price for the chasers is a bit staggering.

Dan

[Stuart]

So then Jo if I set a feed of 0.002 inches will I cut a 500 tpi thread assuming my eye sight and quorn can grind the tool bit  be interesting to use the thread dial 

 My taxi is just pulled up by for now

Stuart

Or shall I chuck some more corn on the ground

[Jo]

So then Jo if I set a feed of 0.002 inches will I cut a 500 tpi thread assuming my eye sight and quorn can grind the tool bit  be interesting to use the thread dial 

Thread dial  thread Dial I remember the Colchester has one of those: It lets you do multi start threads   

Jo

[Stuart]

Well to be truthful my lathe don't have one either , slung it in the parts drawer.

I worked with Mr Meek to sort out the dog clutch for the big bore Myford so now I have set table trips ( threading and turning ) repeatable thread pick up in inferior or metric ( depending on the change wheel set up )

Just push the little lever I goes one way pull it and it goes back to wence it came 

Stuart


Forgot for 8 ba and others I use the geometric die head

[Jo]

I find that cutting 14 and 16BA threads with a Die a bit risky the metal has a nasty habit of breaking off in the die

Yes Mr Silky has one of those and six different positions for thread starting. Not that I can think why you would want a six start thread 

Jo

[Allen Smithee]

Yes Mr Silky has one of those and six different positions for thread starting. Not that I can think why you would want a six start thread 

Multi-start threads (and especially multi-start screwjacks) have higher reliability for safety-critical applications because wear and failure in one thread can be mitigated by the other one. The screwjacks used in (for example) the tailplane trim actuators in aircraft are a single-point-of-failure and must be at least twin-start and sometimes triple-start for this reason. It's also a way of getting a stronger engagement where some other factor limits the thread depth for some reason like a breech thread. Can't think why you'd want six, but it's probably no harder than providing three at the manufacturing stage.

AS

[Dan Rowe]

Here's one example for 1-64:
http://www.amazon.com/gp/product/B009EEX2G2?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s01

If you read the product description it says it meets ASME B18.6.3 specifications. Here is a link to that specification:
http://www.sportpilot.info/sp/Machinery/27_Fast_08B.pdf

It came from the Machinery's Handbook 27 ed. The AF for both #0 and #1 screws is 5/32"

This is the specifications for most of the commercial machine screws that are common in the US and they do not look good for models especially the smaller sizes.

Dan

[sssfox]

Thanks, Dan.  I looked in my 28th Edition Large Print Version and that table is on page 1549.
There are a lot of machine screw tables after that one.  Some go down to 0000 and some don't.

Is it because the ANSI standards go smaller on some types than others?
For example, the plain and slotted hexagon head types only goes to 1.

[Dan Rowe]

Steve,
Thread standards change over time. The original ASME machine screw standard dates to 1907 and was for gage numbers 0-30. I am not sure when the standards included 00, 000, and 0000, but the current standards do not have anything larger than a #12. I have both #14 and #16 dies in my collection.

Dan

[sssfox]

I guess that explains why so many companies start at 1/4" and go up.

Every day I find out more that I don't know.

Steve Fox

[GailinNM]

Sometimes you just have to make up your own hardware and standards.  Here are some M1-,25 X 2mm long screws made in my shop for an engine project.  The hex heads are 0.061 across the flats with a machined in washer face.  This AF is just a little bit large but suits my shop made hex driver made using a 6-32 set screw.  More screws were made 3 and 4 mm long. With failing eyesight CNC is about the only way I can make parts like this anymore. The screws were single pointed on the CNC lathe and the washer diameter turned long enough to cut the heads out of.  Started with 3/32 inch diameter 12L14 "bar" stock.  The he cutoff nub was cut off and the hex head machined on the CNC ,mill.  If you look close at the first photo you can see 2 screws that sneaked into the finished pile  with out the head being milled.
Gail in NM

[zeeprogrammer]

That was a fun "Where's Waldo" shot. 
Nice screws! That would stretch my patience.

[Alan Haisley]

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

Easier to make a tap.
Alan