How to choose the correct die for 1" stock

blackmajicwoman · Jan 6, 2006

How to choose the correct die for 1\" stock

As my profession is electrical engineering, I am quite ignorant when it comes to machining. Can anyone tell me what the proper (or standard) size threading die I need to use for 1" mild steel round bar? Does anyone have a refernece chart that diplays what size die to use use for specific size stock? There seems to be no shortage for tap and drill reference charts, but I can't find a "die and stock" reference chart. Any help would be greatly appreciated. Thanks.

Spiffy · Jan 6, 2006

Re: How to choose the correct die for 1\" stock

Do you have a caliper or a micrometer? I don't have a chart handy, but I'm thinking .980 to 1.000 will cut just fine with a 1" die.

Be sure to get some good cutting oil; also, despite only using them on rare occasion, I sure like quality dies.

If you have an inch to spare and no prescision measuring tools, just start the die on it. If it cuts well and makes good threads, you're fine. I had some 1/2" nominal stock once, that I thought was under nom; couldn't figure out why the die wouldn't bite; meaured it: .030 over nom!

3RRL · Jan 6, 2006

Re: How to choose the correct die for 1\" stock

Hi Shaun,

Maybe I can help? I making an assumption you want to turn that 1" bar stock into a thread? Do you know if you want UNC (coarse threads 8 threads per inch) or UNF (fine threads-12 threads per inch)? Also, what class of thread do you want to make..depends on how much precision the threads require. There are other UNF threads available but generally the UNC or UNF is most common for what we need.

The Major Diameter or outside diameter of the bar stock can be 1" to .998" for coarse or fine threads. You just need to know which one you want.

Here is a link to a thread table that shows the Major Diameters needed(and more) for different threads. I hope it will help you. Just click on the links.
UNC COARSE THREADS

This one shows both UNC an UNF.
BOTH UNC AND UNF

Scroll down to the 1"Ø you are looking for.

Thanks,

blackmajicwoman · Jan 6, 2006

Re: How to choose the correct die for 1\" stock

Hi Rob,

This is exactly what I was looking for. Both links were extemely helpful. I am going with a 1" UNC thread and the diammeter of my stock 1.000". Thanks for your help.

3RRL · Jan 6, 2006

Re: How to choose the correct die for 1\" stock

No problem...glad I actually posted something useful for a change. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

BTW
If you ever need to know ANYTHING regarding the machine trade, the Machinery's Handbook is the bible of the trade. It has EVERYTHING in there.

GoodGuy · Jan 7, 2006

Re: How to choose the correct die for 1\" stock

( the Machinery's Handbook ) 
 Can you get this book locally everywhere?

MadReferee · Jan 7, 2006

Re: How to choose the correct die for 1\" stock

Almost any machine tool supplier will have them. You can probably find them at any of the large book stores. You can also get one from Amazon.com for $54. Look HERE.

GoodGuy · Jan 7, 2006

Re: How to choose the correct die for 1\" stock

Thanks Mad, Do you own one & find it worthwhile ??

3RRL · Jan 7, 2006

Re: How to choose the correct die for 1\" stock

Shaun,

Don't know about Madref but I've owned one since I was 17 (Geez...almost 40 yrs ago!). May Dad handed me down his edition and I handed it down to my oldest son. He still uses gradpa's. I have a 21st edition and I think they are up to 27th now. New changes are listed in the addendum but the meat of the book remains the same.

I am in the machining trade (Plastic Injection Mold Maker/ Design Engineer) so I use this book all the time. It's a killer for general knowledge... your friends won't have a clue what your talking about /forums/images/graemlins/grin.gif
Lots of practical useful information for making and machining stuff. Lots of engineering calculations, strength of materials, threads, gears, math formulas, volumes and sizes, machining techniques, welding, heat treat...you name it.
I think you can get it on a CD now, but I prefer the book to scribble in and make notes.

MadReferee · Jan 8, 2006

Re: How to choose the correct die for 1\" stock

I use mine all the time and have had this edition for over 20 years. It's a little dog-eared and slightly oily/geasy but the data it has is still applicable today.

If you like to visit flea markets and yard/garage sales you might just find a used copy. BTW, the American Machinists Handbook by Rupert Le Grand (copyright 1955) is similar to the Machinery's Handbook in that they both contain the same information. It has been out of print for years but still can be found really cheap (<$10) if you look. I have a copy of AMH I got in 1966 and it's still good today.