Hi Walter,
now I can see that this is a serious matter that concerns erveryone of
us in one way or another.
In fact I remember having problems with screws that seemed to look the
same but didn't fit the same.
So thanks for this enlightenment.
Volker
Walter Knapp schrieb:
> --- In
> <naturerecordists%40yahoogroups.com>, Volker Widmann <>
> wrote:
> >
> > Hi Walter,
> >
> > I could not find out anything about the wentworth
> > thread. Could you be so kind as to tell us what it is.
> > I'm sure it is a big laugh. :-))
>
> Sorry, I shorted out on spelling, try Whitworth. It's biggest problem
> is it uses 55degree thread pitch whereas both the UNF & UNC that was
> the standard in the US, Canada (and Britain) and the ISO metric are
> 60degree pitch. That means that all the carbide threading inserts,
> which are 60 degree, cannot cut this thread. Even if you got the TPI
> correct. You are much more limited in cutting tools for the thread.
> Though you can grind your own lathe tools to match from HSS. And, it's
> nearly impossible to find new fasteners in this thread system.
>
> The British did sign on for the UNF & UNC system in 1949 as the
> standard, but continued to use the Whitworth based system until they
> went metric. This was most troubling in working on any British
> produced autos and such like. I still have rethreading tools for
> working with this stuff, but it's really hard to find. And
> occasionally you still find it on new stuff.
>
> There are quite a few thread standards you can trip over, here's some
> links for more reading:
> http://en.wikipedia.org/wiki/British_Standard_Whitworth
> <http://en.wikipedia.org/wiki/British_Standard_Whitworth>
> http://en.wikipedia.org/wiki/Unified_Thread_Standard
> <http://en.wikipedia.org/wiki/Unified_Thread_Standard>
> http://www.gewinde-normen.de/en/index.html
> <http://www.gewinde-normen.de/en/index.html>
>
> For instance I use UNF standard 1-72 thread screws in the mod SASS to
> hold the support tube. And UNC standard 10-24 screws to hold the
> backplate on. In metric, even coarse, these would be much finer
> threads and more of a problem as they go into plastic. I would prefer
> to use UNC 1-64 thread screws instead of the 1-72, but have not found
> a supplier for the screws in stainless.
>
> I've never found what standard the 5/8 - 27TPI thread of audio mic
> supports came from. (like is on the tripod mount clamp from Crown for
> the SASS) There is also a 7/8 - 27TPI thread associated with
> audio. These sizes are hard to cut on a lathe as most lathes have no
> 27TPI feed, I can't cut them on my lathe without a custom lead screw
> which would be very expensive. Taps and Dies in these sizes are
> special order items and expensive. I managed to get two of each of the
> sizes taps and dies a few years ago. I'm very careful when I use them.
>
> It gets a whole lot less amusing when you have to deal with this sort
> of changing standards. My tools are dual sets of metric and the
> Unified standard. Costs double to be equipped but I can handle and
> machine both. Here, as in England, metric is the newcomer. Just
> recognizing and using the correct thread can be a problem. My tractor
> and it's implements contains fasteners, pins and connectors that are
> metric and non metric. And the tractor, though it says Ford and New
> Holland on it was made by Mazda in Japan. And is definitely not all
> metric. Same with all my cars, a mixture of standards. And we have not
> even gotten into all the variations of head designs.
>
> Walt
>
> __
> We Made Changes
>
> Your Yahoo! Groups email is all new.
>
> Learn More
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJsbTQ4dHU1BF9TAzk3MzU5NzE0BF9wAzEEZ=
3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA25jbW9kBHNsawNpbmZvBHN0aW1l=
AzExNTAzMzE0MDc-;_ylg=3D1/SIG=3D11gd5l5o4/**http%3a//groups.yahoo.com/local=
/newemail.html>
>
> Share Feedback
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJtbm1vMzhrBF9TAzk3MzU5NzE0BF9wAzIEZ=
3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA25jbW9kBHNsawNmZGJjawRzdGlt=
ZQMxMTUwMzMxNDA3;_ylg=3D1/SIG=3D11im36rmb/**http%3a//surveylink.yahoo.com/w=
ix/p1412899.aspx>
>
> Recent Activity
>
> *
> 4
> New Members
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJmMjJyNjNvBF9TAzk3MzU5NzE0BGd=
ycElkAzIxMjY4NjAEZ3Jwc3BJZAMxNjAwMDgzNjYzBHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAz=
ExNTAzMzE0MDc-;_ylg=3D1/SIG=3D11r4jjgb0/**http%3a//groups.yahoo.com/group/n=
aturerecordists/members>
> *
> 1
> New Files
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJnYnVjMGpvBF9TAzk3MzU5NzE0BGd=
ycElkAzIxMjY4NjAEZ3Jwc3BJZAMxNjAwMDgzNjYzBHNlYwN2dGwEc2xrA3ZmaWxlcwRzdGltZQ=
MxMTUwMzMxNDA3;_ylg=3D1/SIG=3D11pvgdf8r/**http%3a//groups.yahoo.com/group/n=
aturerecordists/files>
>
> Visit Your Group
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJlZ3ZhanRlBF9TAzk3MzU5NzE0BGdycElkA=
zIxMjY4NjAEZ3Jwc3BJZAMxNjAwMDgzNjYzBHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTE1MDMz=
MTQwNw--;_ylg=3D1/SIG=3D11jupd8g5/**http%3a//groups.yahoo.com/group/naturer=
ecordists>
>
> SPONSORED LINKS
>
> * Science kits
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJjc2J2aXIzBF9TAzk3MzU5NzE0BF9=
wAzEEZ3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA3NsbW9kBHN0aW1lAzExNT=
AzMzE0MDg-;_ylg=3D1/SIG=3D17p1kct6f/**http%3a//groups.yahoo.com/gads%3ft=3D=
ms%26k=3DScience%2bkits%26w1=3DScience%2bkits%26w2=3DScience%2beducation%26=
w3=3DScience%2bkit%2bfor%2bkid%26w4=3DNatural%2bsound%26w5=3DMy%2bfirst%2bs=
cience%2bkit%26w6=3DSound%26c=3D6%26s=3D122%26g=3D2%26.sig=3D4KJsHrOO3DDo-4=
bxWZD7xg>
> * Science education
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJjNG85bWF0BF9TAzk3MzU5NzE0BF9=
wAzIEZ3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA3NsbW9kBHN0aW1lAzExNT=
AzMzE0MDg-;_ylg=3D1/SIG=3D17u2rvfu0/**http%3a//groups.yahoo.com/gads%3ft=3D=
ms%26k=3DScience%2beducation%26w1=3DScience%2bkits%26w2=3DScience%2beducati=
on%26w3=3DScience%2bkit%2bfor%2bkid%26w4=3DNatural%2bsound%26w5=3DMy%2bfirs=
t%2bscience%2bkit%26w6=3DSound%26c=3D6%26s=3D122%26g=3D2%26.sig=3DE4OJnv3ir=
MTHI3Oh_BPkRQ>
> * Science kit for kid
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJjcjJmbms0BF9TAzk3MzU5NzE0BF9=
wAzMEZ3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA3NsbW9kBHN0aW1lAzExNT=
AzMzE0MDg-;_ylg=3D1/SIG=3D184aqm5k7/**http%3a//groups.yahoo.com/gads%3ft=3D=
ms%26k=3DScience%2bkit%2bfor%2bkid%26w1=3DScience%2bkits%26w2=3DScience%2be=
ducation%26w3=3DScience%2bkit%2bfor%2bkid%26w4=3DNatural%2bsound%26w5=3DMy%=
2bfirst%2bscience%2bkit%26w6=3DSound%26c=3D6%26s=3D122%26g=3D2%26.sig=3D1gC=
WlEoC9PuYM9mIMCdAEQ>
> * Natural sound
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJjanMwNWphBF9TAzk3MzU5NzE0BF9=
wAzQEZ3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA3NsbW9kBHN0aW1lAzExNT=
AzMzE0MDg-;_ylg=3D1/SIG=3D17qdh7njv/**http%3a//groups.yahoo.com/gads%3ft=3D=
ms%26k=3DNatural%2bsound%26w1=3DScience%2bkits%26w2=3DScience%2beducation%2=
6w3=3DScience%2bkit%2bfor%2bkid%26w4=3DNatural%2bsound%26w5=3DMy%2bfirst%2b=
science%2bkit%26w6=3DSound%26c=3D6%26s=3D122%26g=3D2%26.sig=3DPbEYW45bcoewC=
YSGrZI3Bg>
> * My first science kit
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJjMzZwMDU1BF9TAzk3MzU5NzE0BF9=
wAzUEZ3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA3NsbW9kBHN0aW1lAzExNT=
AzMzE0MDg-;_ylg=3D1/SIG=3D1854h1n51/**http%3a//groups.yahoo.com/gads%3ft=3D=
ms%26k=3DMy%2bfirst%2bscience%2bkit%26w1=3DScience%2bkits%26w2=3DScience%2b=
education%26w3=3DScience%2bkit%2bfor%2bkid%26w4=3DNatural%2bsound%26w5=3DMy=
%2bfirst%2bscience%2bkit%26w6=3DSound%26c=3D6%26s=3D122%26g=3D2%26.sig=3D5s=
8nEaKZfySpn07mhNlUWQ>
> * Sound
> <http://us.lrd.yahoo.com/_ylc=3DX3oDMTJjNzVxbDVzBF9TAzk3MzU5NzE0BF9=
wAzYEZ3JwSWQDMjEyNjg2MARncnBzcElkAzE2MDAwODM2NjMEc2VjA3NsbW9kBHN0aW1lAzExNT=
AzMzE0MDg-;_ylg=3D1/SIG=3D17gd5oehh/**http%3a//groups.yahoo.com/gads%3ft=3D=
ms%26k=3DSound%26w1=3DScience%2bkits%26w2=3DScience%2beducation%26w3=3DScie=
nce%2bkit%2bfor%2bkid%26w4=3DNatural%2bsound%26w5=3DMy%2bfirst%2bscience%2b=
kit%26w6=3DSound%26c=3D6%26s=3D122%26g=3D2%26.sig=3DJqU4M97h7eFdKYFWpK6RiA>
>
> .
>
>
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
------------------------------------------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/naturerecordists/
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
------------------------------------------------------------------------
|