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3:35 pm
NWBA Member
April 19, 2010
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I need a set screw for my ancient Flypress. It is 1/2" x12 TPI x1 1/2" long. Can't find a 12 threads per inch one ANYWHERE on the internet and don't want to pay a machinist big bucks to make one. That size Whitworth was standard in early 1900s.. Any out there? I'll sure pay what it's worth plus shipping. Thanks, Eric S.
5:05 pm
May 13, 2010
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Try you local industrial fastener supplier. They may be able to get them for you, but it probably won't be cheap. My wood bandsaw had the table removed for storage by the company I bought it from. They lost the bolts which were 1/2" Whitworth, I was quoted about $70 per bolt. Drilling the holes out and helicoiling them was much cheaper.
5:19 pm
March 26, 2010
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Might be worth seeing if you can get some one on ebay this side of the pond to post you one .... can't weigh much. Whitworth stuff is still relatively easy to get hold of over here.
http://cgi.ebay.co.uk/10-3-8-x.....3cb7de4eb3
If you are really stuck I'm sure I've probably got and could post one
6:01 pm
NWBA Member
April 19, 2010
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Thanks to all! I,of course,tried my local fastener first. They couldn't find one. I searched on line and found British Tools and Fasteners in New York(USA) and they are sending me a couple of bolts. They aren't Allen wrench heads,which I'd prefer,BUT they are the right size and will work. Dollar and change each and 4 bucks shipping. Nice.
11:08 pm
August 14, 2010
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I've got old dies that cut 1/2" - 12 threads in the 60 degree form. Whitworth are a 55 degree thread form and have a rounded root and crest and may not fit. Just FYI.
There may be some old bolts around my place, but they won't be safety head set screws.
12:49 am
NWBA Member
April 19, 2010
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Hmmmmm. Thanks Lewis. Actually-since press is around 100 years old and from UK it may be Whitworth... I'll see how the ones fit that I ordered from British tools...
If I bring the bolt to town with me can folks in the fastener store tell me if it is 55 or 60 degrees?
1:15 am
August 14, 2010
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Eric, my experience with fastener suppliers is that a question like that can hurt their brains. :devil: I brought it up more to point out that 1/2-12 could also be an outdated American pattern. (I have a 1/2 inch set screw that was in the stripped out hole of my Adams fly press. If I can find it I'll check the pitch.)
I just happened to be looking at that chapter of a technical drawing book this morning. (You'd think that would be a sure cure for insomnia....)
1:38 am
March 22, 2010
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Some of the facilties where I worked had machine tools made out of USA. Not often but if a replacment bolt/screw was needed and not in maintenance hardware drawers, we drilled it out and rethreaded for available hardware.
It didn't happen often but it was a fix.
I have a #6 flypress and the adjustment screws are Whitworth, I think, the press was made in India. Don't lose those bolts or nuts!!!!
1:42 am
NWBA Member
July 9, 2010
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Eric,
You should be able to find a Thread Pitch Gauge for a few dollars. When I worked for the Navy it was a tool common to almost all tool boxes. It looks like bits of a saw blade, each with a different number of teeth. The teeth are cut at 60 deg. for US threads. Or use the corner of a drafting triangle to gauge the threads.
Or print out a 60 on paper and cut it out of the paper, or glue it to thin metal and cut it out. There are many ways to skin this cat.
Jeff [Image Can Not Be Found]
My son is the Blacksmith
1:46 am
NWBA Member
July 9, 2010
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My son is the Blacksmith
11:09 pm
June 24, 2010
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If you happen to have a 9/16-12 bolt (or tap) you could use that as a gauge.
12:25 am
NWBA Member
July 9, 2010
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If it is a Whitworth (55 degree) thread, an SAE (60 degree) bolt tap or Angle/thread pitch guage should NOT fit.
My son is the Blacksmith
1:01 am
June 24, 2010
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I just realized how stupid my last post was. Eric already *knows* the bolt he ordered is Whitworth. And if you tried to gauge a 1/2" hole with a 9/16" bolt, it wouldn't make much difference whether the threads were 55 degree or 60 degree . . .
1:05 am
March 22, 2010
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Found this on the internet,,perhaps it has been posted earlier by some one, don't remember everything, an age deal.
http://www.britishfasteners.co.....gwodE13PNg
Cheesehead bolts ???, I thought cheeseheads were in Green Bay WI :bounce::bounce::bounce:
2:40 am
NWBA Member
July 9, 2010
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Mike B;10845 wrote: I just realized how stupid my last post was. Eric already *knows* the bolt he ordered is Whitworth. And if you tried to gauge a 1/2" hole with a 9/16" bolt, it wouldn't make much difference whether the threads were 55 degree or 60 degree . . .
If you are trying to confirm if a 1/2-12 bolt is Whitworth you could use a 9/16-12 SAE to compare the thread forms. Hold the two bolts with the threads meshed, Head to tail, so the heads don't interfere, check the tooth clearances and interferences. If one is 55 deg. and the other is 60 deg you will see a gap caused by the 5 degree angle difference of the thread pitches. The different dia. of the bolts does not matter. I hope that is clear...
My son is the Blacksmith
6:19 am
NWBA Member
April 19, 2010
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Thanks Gene et.al.. Actually the British Tools folks are the ones I ordered the Whitworth 1/2 x 12 from. Really helpful folks.Should be here soon. All is well anyway. I buggered the bolt end up by not having my tool ALL the way in! When I slammed the press down the tool holder seated and scraped the end of set bolt. I found a friend who has a REALLY old set of taps and dies. I used the 12 thread restoring file on bolt and it is fine.I'm fine,Press is fine. The only thing I can foresee,even though mine is just a "hobby" shop,is that I may want a bigger flypress. One of the things I wanted to do was squoosh my 1/2 inch drawer pulls down and the #3 Press just won't do it comfortably without me REALLY slamming the shit out of it.We'll see. The press does everything else I want just fine.Being retired is fun. I NEVER,EVER,EVER want to pick up a phone again in my life and have some jerk chew on me for something not being done on time.Sorry-I digressed....
9:11 am
March 22, 2010
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Checked out the table, several hold down holes, 1/2-13 threaded holes, perhaps an after
thought for Canuk, USA imports, handy for hold downs. Only about 8" or so clearance between the ram guides and table, wonder if these were drilled from the bottom and threaded. Just and old maintenance man here wondering how it was done :giggle::giggle:
11:07 pm
June 24, 2010
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Thanks, J. Wilson. That's what I had in mind. Turns out my second post was the mistaken one. (I should have gone back and read that he really did want to gauge the bolt before "correcting" myself.)
12:50 am
NWBA Member
April 19, 2010
Offline
My two 1/2"x12TPI Whitworth bolts arrived. They fit perfectly in my 100 year old flypress. DO NOT ask me the goddam angle of the threads! I don't know and don't care. They FIT.They Fit! Whoopee.
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