GTA
All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Share Your Simple Home Projects (TRICKS-N-TIPS) => Topic started by: MultimediaMan on September 13, 2013, 12:58:36 AM
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I am a lowly screw. A mere two digits is my size and of a very common pitch am I. I have a slightly larger, more popular, cousin who shares all of my numbers but not my size, larger by a fraction yet his name is a fraction of mine. So close are we that one is often are mistaken for the other. Our better halves know better. I have another close cousin on the metric side of the family who is every bit as common as my larger cousin, but we don't get along at all; about my size, but his pitch is much too far off.
What am I?
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#12-28 ;D
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Close, but no cigar.
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#10-32
8)
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No, and Colder....
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10-24 sort of fits :P 1/4-20 being larger using the numbers :P :P larger screw is fraction of original & 6mmX.1 is metric kin with far different pitch.
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Scott is thinking right... there are others, if you look.
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Scott is thinking right... there are others, if you look.
So that's wrong ? .... My head hurts ... NEXT ;D
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#14 - 20 ;)
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#14 - 20 ;)
So reading this ... it's 1/4-20 you were looking for ?
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no... #14 - 20 was the size... 1/4 -20 was the larger cousin. "I have a slightly larger, more popular, cousin who shares all of my numbers but not my size, larger by a fraction yet his name is a fraction of mine." #14 is 0.242"; 1/4" is 0.250"....
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Been on SAE charts course and fine and no such size as 14 I was able to find ???
Mind sharing what the heck a 14 size is ?
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Depends on what year you look. ;D One of the prime reasons #14 -20 was retired was that it almost was interchangeable with 1/4" - 20. So it's kind of a sucker question if you're not old enough to remember them or to have ever seen one. Most machinists hardly ever notice #14 screws... but they sure notice a #14 screw HOLE... you see a 1/4" - 20 bolt will break off in them almost every time. ;)
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Depends on what year you look. ;D One of the prime reasons #14 -20 was retired was that it almost was interchangeable with 1/4" - 20. So it's kind of a sucker question if you're not old enough to remember them or to have ever seen one. Most machinists hardly ever notice #14 screws... but they sure notice a #14 screw HOLE... you see a 1/4" - 20 bolt will break off in them almost every time. ;)
So a sucker I am .... and that 10-24 still works that riddle :'(
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I'm with Scott on the #14-20. Really? ??? I have lots of old handbooks from various sources and have never seen a #14 listed. The #12 still pops up now and again but is certainly obsoleted. I admit that I didn't start making screws with a file so there is much I don't know. Number 14 (mumbling under breath)
Tom
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Gagemaker.
(http://i42.photobucket.com/albums/e330/sixshootertexan/scan0001_zps8ec8e5d4.jpg) (http://s42.photobucket.com/user/sixshootertexan/media/scan0001_zps8ec8e5d4.jpg.html)
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Tom, the info you need will be found on page 1823 of Machinery's Handbook Twenty Fifth edition it also found it on page 1411 of a very much earlier edition. Ican't give you the date of the earlier publication, as I only have a plastic laminated page over my lathe bench.
John
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Ha ha. I can't argue with the source, I guess you got me. 8) I will say that Machinery's Handbook could use some thinning out.
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All the new technology in the last decade!
John
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We have 3 or 4 different machinist handbooks at work I'll look tomorrow.
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I'll grant you it isn't common anymore, but it used to be quite common as a "trades" screw for certain items, particularly in older tooling and automotive applications (Carburetors, distributors, precision parts of larger machines). In Aerospace, it still has a following among certain aircraft engine manufacturers - Lycoming and Pratt & Whitney. I remember my dad running across the street to the lumber yard to buy some #14 - 20 taps and dies when announced it's removal from the official SAE series... about 1985, I think...
Anyway, here they are, still in the wrapper, about 30 years later...
(http://img842.imageshack.us/img842/1927/u8di.jpg)
Eventually, the 1/4" - 20 was the preferred standard across "disciplines", leading to the decline of the largest end of the numbered screw series during WWII and after. Most people who use #14 - 20 today do it to prevent common (untraceable) 1/4" - 20 fasteners from being used for a particular reason - so they still have a place, crazy though it may be.
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I actually have a 14-20 tap in it's proper drawer (with the number taps) out in the shop :-).
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Regardless which volume of "Machinery's" you are looking at, the table will be in the chapter regarding tapping.
John
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that's not a riddle that's history or trivia..THIS is a riddle.
how much lead would a lead screw lead if a lead screw could lead screws
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That was an interesting bit of trivia. I did a web search and found there was such a thing and it is still supported, though not very common. Thanks for sharing. I am now a wee bit wiser with arcane information and trivia.
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8-32, has a larger cousin 10-32, which can be mistaken for an M5 or 6 don't remember which...
5/16-18 can be mistaken for an M8.....
Just some fun facts...