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Dies are intended to cut new male threads on a pipe or rod. That operation =
is called threading. A tap is intended to cut female threads in a hole, thu=
s called tapping. Both taps and dies can be used to chase an existing thre=
ad, process is chasing. Trick to getting clean, straight threads with a die=
is to make a chamfer on the end of the pipe or rod, about 30 degrees works=
well.
To Tom=E2=80=99s original question it would seem it would take a smaller di=
ameter thread size than a =C2=BD inch die to form a usable thread on a =C2=
=BD inch outer diameter pipe. The root or minor diameter of the =C2=BD inch=
thread is just slightly less than the pipe.=20
However at this point I=E2=80=99m all tapped out=E2=80=A6=E2=80=A6
Perry=20
Sent from Mail for Windows 10
From: John Spaur
Sent: Wednesday, May 13, 2020 1:39 PM
To: 'Bob Spidell'; healeys@autox.team.net
Subject: Re: [Healeys] BSF Taps and Dies
With the correctly sized die for the pipe or rod, threads can be cut.
John
-----Original Message-----
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of Bob Spid=
ell
Sent: Wednesday, May 13, 2020 8:18 AM
To: healeys@autox.team.net
Subject: Re: [Healeys] BSF Taps and Dies
My (somewhat limited) experience is that the so-called 'dies' are really on=
ly thread chasers. If you try to use them to actually thread, say, a pipe o=
r rod the die will wander laterally and you won't get a straight thread. I =
don't know if actual 'dies' are available outside a machine shop but, proba=
bly the only way to get a straight thread is with a lathe.
On 5/13/2020 6:49 AM, Bob Haskell wrote:
> Tom,
>
> If the pipe is 1/2" outside diameter, then a 1/2"-13 UNC or 20 UNF die=20
> would be used. Pipe is usually given by the inside diameter and=20
> normally has tapered threads (NPT), in the US. A 1/2" pipe would use=20
> a 1/2" NPT die which is much larger than the 1/2"-13 or 20 dies.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
> On 5/13/20 7:12 AM, Tom Felts wrote:
>> Totally off Healey content, but here is a stupid question Re. dies. I=20
>> have a piece of 1/2" OD steel pipe I want to thread (the outside).
>> I don't know the die size to use. A 1/2" die seems way too small.=20
>> Anyone know what size die to use? the number of threads doesn't=20
>> matter---just the size of the die.
>> Thanks
>> Tom
>>
>> ----- Original Message -----
>> From: Michael MacLean <rrengineer.mike@att.net>
>> To: 'Healeys' <healeys@autox.team.net>, simon lachlan=20
>> <simon.lachlan@alexarevel.plus.com>
>> Sent: Wed, 13 May 2020 02:51:28 -0400 (EDT)
>> Subject: Re: [Healeys] BSF Taps and Dies
>>
>>
>> I just want them to clean up threads. Should be adequate for that..
>> Mike M
>>
>
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72"><div cla=
ss=3DWordSection1><p class=3DMsoNormal>Dies are intended to cut new male th=
reads on a pipe or rod. That operation is called threading. A tap is intend=
ed to cut female threads in a hole, thus called tapping.=C2=A0 Both taps an=
d dies can be used to chase an existing thread, process is chasing. Trick t=
o getting clean, straight threads with a die is to make a chamfer on the en=
d of the pipe or rod, about 30 degrees works well.</p><p class=3DMsoNormal>=
<o:p> </o:p></p><p class=3DMsoNormal>To Tom=E2=80=99s original questio=
n it would seem it would take a smaller diameter thread size than a =C2=BD =
inch die to form a usable thread on a =C2=BD inch outer diameter pipe. The =
root or minor diameter of the =C2=BD inch thread is just slightly less than=
the pipe. </p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNorm=
al>However at this point I=E2=80=99m all tapped out=E2=80=A6=E2=80=A6</p><p=
class=3DMsoNormal>Perry </p><p class=3DMsoNormal><o:p> </o:p></p><p c=
lass=3DMsoNormal>Sent from <a href=3D"https://go.microsoft.com/fwlink/?Link=
Id=3D550986">Mail</a> for Windows 10</p><p class=3DMsoNormal><o:p> </o=
:p></p><div style=3D'mso-element:para-border-div;border:none;border-top:sol=
id #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal style=3D'b=
order:none;padding:0in'><b>From: </b><a href=3D"mailto:jmsdarch@sbcglobal.n=
et">John Spaur</a><br><b>Sent: </b>Wednesday, May 13, 2020 1:39 PM<br><b>To=
: </b><a href=3D"mailto:bspidell@comcast.net";>'Bob Spidell'</a>; <a href=3D=
"mailto:healeys@autox.team.net";>healeys@autox.team.net</a><br><b>Subject: <=
/b>Re: [Healeys] BSF Taps and Dies</p></div><p class=3DMsoNormal><o:p> =
;</o:p></p><p class=3DMsoNormal>With the correctly sized die for the pipe o=
r rod, threads can be cut.</p><p class=3DMsoNormal>John</p><p class=3DMsoNo=
rmal><o:p> </o:p></p><p class=3DMsoNormal>-----Original Message-----</=
p><p class=3DMsoNormal>From: Healeys [mailto:healeys-bounces@autox.team.net=
] On Behalf Of Bob Spidell</p><p class=3DMsoNormal>Sent: Wednesday, May 13,=
2020 8:18 AM</p><p class=3DMsoNormal>To: healeys@autox.team.net</p><p clas=
s=3DMsoNormal>Subject: Re: [Healeys] BSF Taps and Dies</p><p class=3DMsoNor=
mal><o:p> </o:p></p><p class=3DMsoNormal>My (somewhat limited) experie=
nce is that the so-called 'dies' are really only thread chasers. If you try=
to use them to actually thread, say, a pipe or rod the die will wander lat=
erally and you won't get a straight thread. I don't know if actual 'dies' a=
re available outside a machine shop but, probably the only way to get a str=
aight thread is with a lathe.</p><p class=3DMsoNormal><o:p> </o:p></p>=
<p class=3DMsoNormal>On 5/13/2020 6:49 AM, Bob Haskell wrote:</p><p class=
=3DMsoNormal>> Tom,</p><p class=3DMsoNormal>><o:p> </o:p></p><p =
class=3DMsoNormal>> If the pipe is 1/2" outside diameter, then a 1/=
2"-13 UNC or 20 UNF die </p><p class=3DMsoNormal>> would be used.=
=C2=A0 Pipe is usually given by the inside diameter and </p><p class=3DMsoN=
ormal>> normally has tapered threads (NPT), in the US.=C2=A0 A 1/2"=
pipe would use </p><p class=3DMsoNormal>> a 1/2" NPT die which is =
much larger than the 1/2"-13 or 20 dies.</p><p class=3DMsoNormal>><=
o:p> </o:p></p><p class=3DMsoNormal>> Cheers,</p><p class=3DMsoNorm=
al>><o:p> </o:p></p><p class=3DMsoNormal>> Bob Haskell</p><p cla=
ss=3DMsoNormal>> Austin Healey 3000 BN7/BT7 registrar</p><p class=3DMsoN=
ormal>><o:p> </o:p></p><p class=3DMsoNormal>> On 5/13/20 7:12 AM=
, Tom Felts wrote:</p><p class=3DMsoNormal>>> Totally off Healey cont=
ent, but here is a stupid question Re. dies. I </p><p class=3DMsoNormal>>=
;> have a piece of 1/2" OD steel pipe I want to thread (the outside=
).</p><p class=3DMsoNormal>>> I don't know the die size to use.=C2=A0=
A 1/2" die seems way too small. </p><p class=3DMsoNormal>>> Any=
one know what size die to use?=C2=A0 the number of threads doesn't </p><p c=
lass=3DMsoNormal>>> matter---just the size of the die.</p><p class=3D=
MsoNormal>>> Thanks</p><p class=3DMsoNormal>>> Tom</p><p class=
=3DMsoNormal>>><o:p> </o:p></p><p class=3DMsoNormal>>> ---=
-- Original Message -----</p><p class=3DMsoNormal>>> From: Michael Ma=
cLean <rrengineer.mike@att.net></p><p class=3DMsoNormal>>> To: =
'Healeys' <healeys@autox.team.net>, simon lachlan </p><p class=3DMsoN=
ormal>>> <simon.lachlan@alexarevel.plus.com></p><p class=3DMsoN=
ormal>>> Sent: Wed, 13 May 2020 02:51:28 -0400 (EDT)</p><p class=3DMs=
oNormal>>> Subject: Re: [Healeys] BSF Taps and Dies</p><p class=3DMso=
Normal>>><o:p> </o:p></p><p class=3DMsoNormal>>><o:p> =
;</o:p></p><p class=3DMsoNormal>>> I just want them to clean up threa=
ds.=C2=A0 Should be adequate for that..</p><p class=3DMsoNormal>>> Mi=
ke M</p><p class=3DMsoNormal>>><o:p> </o:p></p><p class=3DMsoNor=
mal>><o:p> </o:p></p><p class=3DMsoNormal><o:p> </o:p></p></di=
v></body></html>=
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