Unknown thread standard (italian coffee machine)
 

Hello everyone!

I restore vintage espresso machines and right now I have one machine
with really strange threads, which are used on pipe connections. The
machine was manufactured in Italy in the 50s. Here are some examples:

TPI 20 diameter 14.9mm = 0.5866"
TPI 20 diameter 19.25mm = 0.7578"
TPI 16 diameter 20.25mm = 0.7972"
TPI 16 diameter 22.8mm = 0.8976"
TPI 16 diameter 27.7mm = 1.0905"

Does anyone know what kind of threads it might be?

Many thanks,
Julius

Unknown thread standard (italian coffee machine)
 

"Nicht die Bohne" wrote in message
...
Hello everyone!

I restore vintage espresso machines and right now I have one machine
with really strange threads, which are used on pipe connections. The
machine was manufactured in Italy in the 50s. Here are some examples:

TPI 20 diameter 14.9mm = 0.5866"
TPI 20 diameter 19.25mm = 0.7578"
TPI 16 diameter 20.25mm = 0.7972"
TPI 16 diameter 22.8mm = 0.8976"
TPI 16 diameter 27.7mm = 1.0905"

Does anyone know what kind of threads it might be?

Many thanks,
Julius

It's "IBT" standard. (Italian ******* Thread)

Unknown thread standard (italian coffee machine)
 

"Buerste" fired this volley in news:zSj7m.16491
:

It's "IBT" standard. (Italian ******* Thread)

Yeah... they used that standard on Fiats until the late 1990s.

Then they changed everyting over to Quasi-Metric Standard Hungarian
Industrial Threads. (Quasi-metric S.H.I.T.)

LLoyd

Unknown thread standard (italian coffee machine)
 

I have a table originally compiled by Andy Pugh that covers about 520
standard threads in the following thread systems and did not get a hit.
Good luck!!:

BA = British association. CEI = Cycle Engineers Institute.
ADM = Admiralty. M = ISO Metric. Whit = Whitworth.
UNF/UNC = Unified national Fine/Coarse. BSF = British Standard Fine.
W.INS = Whitworth Instrument. W.Pipe = Whitworth Pipe Thread
Brass = Brass thread. PROG = Progress Thread.
BSP = British Standard Pipe Thread. WALTH = Waltham Thread
PEND = Watch Pendant Thread. GAS = Gas (Brass Pipe) Thread
THURY = Swiss Screw Thread. ASME = ASME Thread.
HOLTZ= Holtzapfels Threads. LOEW = Loewenhertz Threads.
SPARK = Spark Plug Threads. Elgin = Elgin watch screw threads (L = left
hand thread)
CROWN = Watch crown threads. BUTTON = Watch button threads
COND = Steel conduit thread (DIN 40430)




Buerste wrote:
"Nicht die Bohne" wrote in message
...
Hello everyone!

I restore vintage espresso machines and right now I have one machine
with really strange threads, which are used on pipe connections. The
machine was manufactured in Italy in the 50s. Here are some examples:

TPI 20 diameter 14.9mm = 0.5866"
TPI 20 diameter 19.25mm = 0.7578"
TPI 16 diameter 20.25mm = 0.7972"
TPI 16 diameter 22.8mm = 0.8976"
TPI 16 diameter 27.7mm = 1.0905"

Does anyone know what kind of threads it might be?

Many thanks,
Julius

It's "IBT" standard. (Italian ******* Thread)

Unknown thread standard (italian coffee machine)
 

That means it might be a custom made thread? Thanks for your research
Lloyd!! I also have already checked several websites with thread
standards and couldn't find anything. But your table seems to include
even more standards.

Julius

Unknown thread standard (italian coffee machine)
 

On 15 Jul., 16:15, RoyJ wrote:
I have a table originally compiled by Andy Pugh that covers about 520
standard threads in the following thread systems and did not get a hit.
Good luck!!:

BA = British association. CEI = Cycle Engineers Institute.
ADM = Admiralty. M = ISO Metric. Whit = Whitworth.
UNF/UNC = Unified national Fine/Coarse. BSF = British Standard Fine.
W.INS = Whitworth Instrument. W.Pipe = Whitworth Pipe Thread
Brass = Brass thread. PROG = Progress Thread.
BSP = British Standard Pipe Thread. WALTH = Waltham Thread
PEND = Watch Pendant Thread. GAS = Gas (Brass Pipe) Thread
THURY = Swiss Screw Thread. ASME = ASME Thread.
HOLTZ= Holtzapfels Threads. LOEW = Loewenhertz Threads.
SPARK = Spark Plug Threads. Elgin = Elgin watch screw threads (L = left
hand thread)
CROWN = Watch crown threads. BUTTON = Watch button threads
COND = Steel conduit thread (DIN 40430)

Buerste wrote:
"Nicht die Bohne" wrote in message
...
Hello everyone!

I restore vintage espresso machines and right now I have one machine
with really strange threads, which are used on pipe connections. The
machine was manufactured in Italy in the 50s. Here are some examples:

TPI 20 diameter 14.9mm = 0.5866"
TPI 20 diameter 19.25mm = 0.7578"
TPI 16 diameter 20.25mm = 0.7972"
TPI 16 diameter 22.8mm = 0.8976"
TPI 16 diameter 27.7mm = 1.0905"

Does anyone know what kind of threads it might be?

Many thanks,
Julius

It's "IBT" standard. (Italian ******* Thread)

That means it might be a custom made thread? Thanks for your research
Roy!! I also have already checked several websites with thread
standards and couldn't find anything. But your table seems to include
even more standards.

Julius

Unknown thread standard (italian coffee machine)
 

--Dollars to donuts some one guy was crankin' out these machines in
a shop with a weird lathe and weird feed ratios.

--
"Steamboat Ed" Haas : Imagine what I could do if
Hacking the Trailing Edge! : I knew what I was doing...
www.nmpproducts.com
---Decks a-wash in a sea of words---

Unknown thread standard (italian coffee machine)
 

On Wed, 15 Jul 2009 02:09:19 -0700 (PDT), Nicht die Bohne
wrote:

Hello everyone!

I restore vintage espresso machines and right now I have one machine
with really strange threads, which are used on pipe connections. The
machine was manufactured in Italy in the 50s. Here are some examples:

TPI 20 diameter 14.9mm = 0.5866"
TPI 20 diameter 19.25mm = 0.7578"
TPI 16 diameter 20.25mm = 0.7972"
TPI 16 diameter 22.8mm = 0.8976"
TPI 16 diameter 27.7mm = 1.0905"

Does anyone know what kind of threads it might be?

Many thanks,
Julius
========
While this may not be *THE* answer, it is "A" answer.

During the time period immediatly after WW2 many surplus INCH
standard lathes were sent overseas as part of the post-war
reconstruction effort.

In many cases the parts these produced were ******* metric/inch
as you describe with inch threads but metric
diameters/lengths/thread forms, with the inch thread selected as
close as possible to the metric size.


Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).

Unknown thread standard (italian coffee machine)
 

On Jul 15, 10:41*am, F. George McDuffee gmcduf...@mcduffee-
associates.us wrote:

In many cases the parts these produced were ******* metric/inch
as you describe with inch threads but metric
diameters/lengths/thread forms, with the inch thread selected as
close as possible to the metric size.

Yes. Consider BA - used by the Brits for years but actually metric!

Unknown thread standard (italian coffee machine)
 

On Jul 15, 3:09*am, Nicht die Bohne
wrote:
Hello everyone!

I restore vintage espresso machines and right now I have one machine
with really strange threads, which are used on pipe connections. The
machine was manufactured in Italy in the 50s. Here are some examples:

TPI 20 *diameter 14.9mm = 0.5866"
TPI 20 *diameter 19.25mm * * * *= 0.7578"
TPI 16 *diameter 20.25mm * * * *= 0.7972"
TPI 16 *diameter 22.8mm = 0.8976"
TPI 16 *diameter 27.7mm = 1.0905"

Does anyone know what kind of threads it might be?

Many thanks,
Julius

Hand-chased by some guy on a treadle lathe? You don't NEED dies or
taps to cut threads, they do help to make interchangeable parts,
though. If it's got that hand-made, one-off look, it might have been
done that way.

Stan

Unknown thread standard (italian coffee machine)
 

Are you sure they are actually 20 TPI and 16 TPI ? These are very close to
a pitch of 1.25 mm and 1.5 mm respectively. Just a left field idea, but is
it possible the pipes are specified for their nominal bore size rather than
OD, similar to the BSP system. Someone in Italy must know.
--
Regards,

Chas.

(To email me, replace "xxx" with letters tango papa golf.)