#7-30 Threading Die

[thestelster]

HELP!!

I am hoping that someone might be able to lend me a #7-30 threading die.

A little while ago I purchased a Starrett No.995 planer gauge. It's missing a couple of accessories which I would like to make. Starrett uses odd size screws, and my lathe doesn't cut 30tpi. (I plan on making gears for it in the future.)

I found a die online, but they discontinued making it.

 

[Mcgyver]

Bizarre, hate when they do crap like that. Working on a Record plane and threads on it (holding the handles on) are 7/32 20. Grrrr.

So you actually found a use for a planer guage? Do tell! Semi-joking, I've got one but can't remember when I last touched it. I think it has the accessories if you need anything measured/photographed

 

[Dan Dubeau]

I don't have a die, but my Myford will do 30tpi, and you're welcome to come and use it. Or if you want I could make the screw/turn the threads for you if you're not in a hurry.

 

[thestelster]

I was planing on using it to hold an indicator while on the surface plate.

I have a Starrett height gauge that I use but its 18" tall, so I wanted something smaller, more portable.

 

[ChazzC]

See if you can find a #6-30 adjustable die:



My guy at Starrett once explained to me that legacy tools (and many of the current versions where they haven't made any changes) have "odd-ball" threads because they didn't standardize parts when they were first developed. The topic came up when I was trying to figure out what the threads were on a PT13820 (called out as "380"); part of a 196A1Z Kit:


The threads are 28 TPI, but larger than 12-28, and I wanted to make a longer rod. The Starrett specification is 0.231"-28, so I turned the end of a rod to 0.231", got a 12-28 adjustable die and opened it up until it produced full threads on the new diameter.

 

[Susquatch]

HELP!!

I am hoping that someone might be able to lend me a #7-30 threading die.

A trip down the 401 to Lake Erie South of Chatham for burgers and a custom screw sounds like a day well spent.

Edit CRAP - I didn't see @Dan Dubeau offer till after posting. I bet my burgers are better than his........

 

[Tom Kitta]

I probably have it, let me check.

 

[Mcgyver]

My guy at Starrett once explained to me that legacy tools (and many of the current versions where they haven't made any changes) have "odd-ball" threads because they didn't standardize parts when they were first developed.

Believable, but if the only reason for doing something is "we've always done it that way", well, it's not good.

 

[ChazzC]

Believable, but if the only reason for doing something is "we've always done it that way", well, it's not good.

Maybe, but seeing as how Starrett instruments last a really long time, it’s good to know that repair parts will fit the old and new ones.

 

[thestelster]

Ok guys. I've hit the motherload for Starrett screws.

I have an old Starrett book, no copyright date, with screw thread information.

 

[140mower]

Ok guys. I've hit the motherload for Starrett screws.

I have an old Starrett book, no copyright date, with screw thread information.

Mmmmmmm. Old books........ I like old books almost as much as I love old machines.

 

[thestelster]

More info: ASME screw threads.

 

[Susquatch]

Ok guys. I've hit the motherload for Starrett screws.

Any chance that old book can be found as a pdf?

And what's with that dumb title? I bet there are more machinists than machinist's apprentices who have and use the book.

 

[Tecnico]

And what's with that dumb title? I bet there are more machinists than machinist's apprentices who have and use the book.

All the old skool machinists have all that memorized. Being so very non-PC here, it separates the men from the boys!

D

 

[thestelster]

Any chance that old book can be found as a pdf?

And what's with that dumb title? I bet there are more machinists than machinist's apprentices who have and use the book.

I was thinking the same thing.

Here is the link to the 1st Edition.

Machinery’s Handbook : The Industrial Press : Free Download, Borrow, and Streaming : Internet Archive

A reference book on machine design and shop practice for the mechanical engineer,draftsman, toolmaker and machinist. Sixth edition, 1924. This book contributed...

archive.org

 

[ChazzC]

Any chance that old book can be found as a pdf?

https://archive.org/details/starrettbookform00fairrich

And what's with that dumb title? I bet there are more machinists than machinist's apprentices who have and use the book.

The new version:
https://www.starrett.com/details?cat-no=1700

 

[Susquatch]

The new version:

Thanks!

Snagged the old one as a PDF.

As far as I can tell you have to buy the new version from Starrett.

 

[Tom Kitta]

Yeah I looked through like 100 small dies and I don't have a single 7. I have dozen of 8s and dozen of 6 and 5s etc. but not a single 7. This is very rare indeed.

30 is also not a very common number, this is why maybe lathe is not set to even cut this.

 

[thestelster]

Yeah I looked through like 100 small dies and I don't have a single 7. I have dozen of 8s and dozen of 6 and 5s etc. but not a single 7. This is very rare indeed.

30 is also not a very common number, this is why maybe lathe is not set to even cut this.

Thanks @Tom Kitta , I really appreciate you looking. Apparently, they stopped using #7, #9, #11 in the 1920's. I think I'll order a #6-30 split die and open it up to #7 like @ChazzC mentioned.

 

[Susquatch]

I think I'll order a #6-30 split die and open it up to #7 like @ChazzC mentioned.

Be careful. This doesn't work real well with good dies. They snap in half. Happened to me 3 times. Bought a cheap crappy die that didn't break. Much better.