Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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Default Taper tolerances

For something like a taper for a R-8 or MT 4 1/2 or 5C or MT 3 what kind of
tolerance in inch per foot is considered reasonable?

Thanks,

Wes

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Default Taper tolerances


"Wes" wrote in message
...
For something like a taper for a R-8 or MT 4 1/2 or 5C or MT 3 what kind
of
tolerance in inch per foot is considered reasonable?


My son just showed me the official engineering symbol for this. Make two
large UU connected together. Then put an arrow through it ---. The term is
called, "dead nuts", VBG

karl


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Default Taper tolerances

According to Wes :
For something like a taper for a R-8 or MT 4 1/2 or 5C or MT 3 what kind of
tolerance in inch per foot is considered reasonable?


Well ... considering how Morse tapers are supposed to work, I
would consider them the most critical -- perhaps a half thousandth in
the total working length of the taper.

I would consider the R-8 and the 5C to be a lot less critical --
since the taper of the collet itself will change as it closes, and it is
held in place by a drawbar. (The same applies to a Morse taper *collet*
instead of a solid shank tool with a Morse taper which depends on the
grip of the shank in the socket for holding properly.

Enjoy,
DoN.

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Default Taper tolerances


"Wes" wrote in message
...
For something like a taper for a R-8 or MT 4 1/2 or 5C or MT 3 what kind

of
tolerance in inch per foot is considered reasonable?

Thanks,

Wes


The answer is, tighter than I can measure.

I had one R-8 that tended to stick in the mill. After much head-scratching
(it measured the same as the others) and looking for wear spots (I didn't
really want to get my mill spindle full of Prussian Blue...), I figured
where the problem HAD to be. I chucked the offending R-8 into the lathe,
gave it a spin and hit it with some emery cloth for about two seconds. It
took off enough so that the collet now fit perfectly. And I still couldn't
measure the change.

Jerry


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Default Taper tolerances

"Karl Townsend" wrote:


My son just showed me the official engineering symbol for this. Make two
large UU connected together. Then put an arrow through it ---. The term is
called, "dead nuts", VBG




I never learned that symbol in colledge

Wes


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Default Taper tolerances


"Wes" wrote in message
...
"Karl Townsend" wrote:


My son just showed me the official engineering symbol for this. Make two
large UU connected together. Then put an arrow through it ---. The term
is
called, "dead nuts", VBG




I never learned that symbol in colledge


"The Kid" had to explain it to me. The UU is your nutsac. the arrow killed
it. Hence, "Dead Nuts". He designs all the fixtures for production CNC
machining after writing the programs at his company. When he wants the
fixture craftsman to pay special attention to this detail, he includes the
symbol. Its guaranteed to get a call from the shop and then a laugh. Plus
that detail gets made just right.

Karl


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Default Taper tolerances

Karl Townsend wrote:
"Wes" wrote in message
...
"Karl Townsend" wrote:

My son just showed me the official engineering symbol for this. Make two
large UU connected together. Then put an arrow through it ---. The term
is
called, "dead nuts", VBG



I never learned that symbol in colledge


"The Kid" had to explain it to me. The UU is your nutsac. the arrow killed
it. Hence, "Dead Nuts". He designs all the fixtures for production CNC
machining after writing the programs at his company. When he wants the
fixture craftsman to pay special attention to this detail, he includes the
symbol. Its guaranteed to get a call from the shop and then a laugh. Plus
that detail gets made just right.

Had a similar experience concerning electronics PCB assembly, many years
ago - before that went to China. Production kept putting a certain
transistor in the board backwards. Inspectors rejected, boards were
reworked, & more bad boards kept coming out.
Finally, the inspector wrote on the reject slip, "TR44 AAF". Nothing more.
No-one in production had ever seen "AAF" before. Not the foreman, not
the manager, not the ...
So finally, they had to ask the inspector himself (in a different
section, naturally). Translation: "AAF" = "A**e About Face". Much
hilarity all round, & the point finally sank in.
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Default RCM: Taper tolerances

I'm going through the current topics to hopefully suggest a way to tag
valid RCM traffic.


Add RCM: on the beginning of the title line - BEFORE the obligatory OT?

Hang tiugh - keep posting.

Cavelamb
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According to cavelamb himself :
I'm going through the current topics to hopefully suggest a way to tag
valid RCM traffic.


Add RCM: on the beginning of the title line - BEFORE the obligatory OT?


*Don't* use a colon. Outlook Express certainly converts every
two letter group followed by a ':' at the start of a "Subject: " header
to " " (It thinks that it may be an equivalent of " " in some
other language.) I don't know for sure what it does with three letter
groups, but try something else to make it stand out -- enclosing it in
square brackets "[]" is probably a pretty good one -- and do the same
with "OT" when you need to add it, so OE won't turn it off for you.

I've set up my killfile (using trn as a newsreader) to reject
anything with "sci.crypt" in the headers, since the vast majority of
this is an attack on that newsgroup, and every one of these has that
newsgroup name in the cross-posting list in the "Newsgroups: " header.
It takes a while for the newsreader to process it all, but it does clean
things up nicely. It is best to move the search for "sci.crypt" to the
beginning of the killfile, so it can clean up the most before your other
killfile entries have to wade through it.

Good Luck,
DoN.

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Default [RCM] Taper tolerances

DoN. Nichols wrote:

According to cavelamb himself :

I'm going through the current topics to hopefully suggest a way to tag
valid RCM traffic.


Add RCM: on the beginning of the title line - BEFORE the obligatory OT?



*Don't* use a colon. Outlook Express certainly converts every
two letter group followed by a ':' at the start of a "Subject: " header
to " " (It thinks that it may be an equivalent of " " in some
other language.) I don't know for sure what it does with three letter
groups, but try something else to make it stand out -- enclosing it in
square brackets "[]" is probably a pretty good one -- and do the same
with "OT" when you need to add it, so OE won't turn it off for you.

I've set up my killfile (using trn as a newsreader) to reject
anything with "sci.crypt" in the headers, since the vast majority of
this is an attack on that newsgroup, and every one of these has that
newsgroup name in the cross-posting list in the "Newsgroups: " header.
It takes a while for the newsreader to process it all, but it does clean
things up nicely. It is best to move the search for "sci.crypt" to the
beginning of the killfile, so it can clean up the most before your other
killfile entries have to wade through it.

Good Luck,
DoN.

Ok Don, Copy that about the colon useage in IE.
I use netscape, so what do I know...

If [RCM] can work mo betta I'm all for it.

Nice youe reader can clean up YOUR feed, but we need to find something
that will work for everybody or you'll ne talking to yourself.






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Default [RCM] Taper tolerances

According to cavelamb himself :
DoN. Nichols wrote:

According to cavelamb himself :

I'm going through the current topics to hopefully suggest a way to tag
valid RCM traffic.


Add RCM: on the beginning of the title line - BEFORE the obligatory OT?



*Don't* use a colon. Outlook Express certainly converts every
two letter group followed by a ':' at the start of a "Subject: " header
to " " (It thinks that it may be an equivalent of " " in some
other language.) I don't know for sure what it does with three letter
groups, but try something else to make it stand out -- enclosing it in
square brackets "[]" is probably a pretty good one -- and do the same
with "OT" when you need to add it, so OE won't turn it off for you.

I've set up my killfile (using trn as a newsreader) to reject
anything with "sci.crypt" in the headers, since the vast majority of
this is an attack on that newsgroup, and every one of these has that
newsgroup name in the cross-posting list in the "Newsgroups: " header.
It takes a while for the newsreader to process it all, but it does clean
things up nicely. It is best to move the search for "sci.crypt" to the
beginning of the killfile, so it can clean up the most before your other
killfile entries have to wade through it.


[ ... ]

Ok Don, Copy that about the colon useage in IE.
I use netscape, so what do I know...


I don't (and can't) use OE, but I've seen the effect where
someone started a thread marked as "OT:", and I don't see any of it
until I hit the first followup by an OE user, whereupon the thread map
shows a bunch of "already read" articles preceding the one which I saw.

If [RCM] can work mo betta I'm all for it.


It is more likely to keep going once you start it, at least.

Nice youe reader can clean up YOUR feed, but we need to find something
that will work for everybody or you'll ne talking to yourself.


The real trick is how many people's newsreaders have killfiles
which can look at the headers -- and in particular at the "Newsgroups: "
headers. For everyone who can (and who learns to do it), the junk
simply goes away -- as I don't see any *valid* cross-posting between
sci.crypt and rec.crafts.metalworking, so everything which gets killed
is good riddance.

I know that the killfile in some of the newsreaders is quite
good, while others are pretty useless.

FWIW, I timed the killfile this evening. 8 minutes and 51
seconds to clean up rec.crafts.metalworking from the cross-posted
garbage. The people in sci.crypt have a lot more problems, because they
are getting cross-posted garbage from a lot of different newsgroups, so
they could start out by killfiling anything from
rec.crafts.metalworking, then soc.religion.quaker (or whatever the
correct name is), then others as they identify them.

Of course, newsguy seems to be doing a good job of killing most
of the garbage. I was told that rec.crafts.metalworking had 25??
articles in it, but the killfile only had to deal with about six
hundred. I don't know whether that is newsguy's work or whether there
is a good cancelbot working to help clean it up. Of course, that
cancelbot does no good for any news server which ignores cancels (as
many do, thanks to the abuse of them which has happened over time).

Good Luck,
DoN.

--
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Default Taper tolerances

According to Steve Ackman :
In , on 14 Aug 2007 02:49:03 GMT, DoN.
Nichols, wrote:

FWIW, I timed the killfile this evening. 8 minutes and 51
seconds to clean up rec.crafts.metalworking from the cross-posted
garbage.


I don't even notice the time slrn takes. Maybe 1/2
second. This on a 1.5Ghz machine, so certainly no
speed demon... that's on ~42,000 articles.


Hmm ... this machine is a dual 450 MHZ UltraSPARC, but the
limiting factor is how long it takes to get all the headers downloaded
multiple times -- plus something like perhaps twenty more times to scan
the entire body for certain things. I avoid doing the full scanning as
much as possible. But I do have 427 total lines in the killfile, and it
is a separate pass for each of them.

These things went a *lot* faster when I was running my own local
news server. :-)

Does your system download and cache all of the headers prior to
running the killfile?

I wondered whether they were being killed at the
server since I have it set to filter anything posted
to 5 or more groups. Checked the news log though...

$ bzcat news*bz2 | grep metalworking | grep "too many groups" | wc -l
20

Nothing significant there.

This is what a slrn filter looks like... matter of
fact, it's the exact format and location as a Pan filter.
Who knows. Maybe other readers also use this format
at ~/News/Score

%BOS
[rec.crafts.metalworking]
Sco =-9999
Newsgroup:.*sci\.crypt
%EOS

Hmm ... I was using the scoring back when I was using strn, but
it was even slower than the killfile.

Perhaps I should look into slrn.

Enjoy,
DoN.

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