1/4" PEX tubing has an OD of .375

3/8 PEX tubing has an ID less than .375

My sample measured .330".

The goal is to slide a piece of 1/4" PEX tube through a 1" length of
3/8" PEX tubing.

Using a crude jig and my drill press, I proved that it could be done.

PEX is soft and it melts if overheated.

Approximately 0.025" needs to be shaved from the PEX wall to increase
the diameter to .375".

What jig/drill/speed/step, etc. would you suggest?


..

fired this volley in news:ab4d5408-508a-4dbf-a401-
:
Approximately 0.025" needs to be shaved from the PEX wall to increase
the diameter to .375".

What jig/drill/speed/step, etc. would you suggest?


Why not warm the outer tube and expand it with a mandrel?

LLoyd

On Dec 23, 8:08*am, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:
fired this volley in news:ab4d5408-508a-4dbf-a401-
:

Approximately 0.025" needs to be shaved from the PEX wall to increase
the diameter to .375".

What jig/drill/speed/step, etc. *would you suggest?

Why not warm the outer tube and expand it with a mandrel?

LLoyd

LLoyd,


A great suggestion to increase the ID, if the OD was not critical.

However the 3/8 PEX OD has a 1/2 -18 thread and it must not be
altered.

fired this volley in news:993d540c-d2c0-4df0-98df-
:
A great suggestion to increase the ID, if the OD was not critical.

However the 3/8 PEX OD has a 1/2 -18 thread and it must not be
altered.

Then it would be a great deal easier to slip the 1/4" pex onto a
mandrel, and turn down its O.D. than it would to increase the I.D. of
the larger tube.

LLoyd

On Tue, 23 Dec 2008 05:04:50 -0800 (PST), wrote:

1/4" PEX tubing has an OD of .375

3/8 PEX tubing has an ID less than .375

My sample measured .330".

The goal is to slide a piece of 1/4" PEX tube through a 1" length of
3/8" PEX tubing.

Using a crude jig and my drill press, I proved that it could be done.

PEX is soft and it melts if overheated.

Approximately 0.025" needs to be shaved from the PEX wall to increase
the diameter to .375".

What jig/drill/speed/step, etc. would you suggest?

If you are only worried about the 1" length of 3/8" why not just drill
the 3/8" tubing out with a twist drill?
Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

On Dec 23, 8:38*am, Bruce In Bangkok
wrote:
On Tue, 23 Dec 2008 05:04:50 -0800 (PST), wrote:
1/4" PEX tubing has an OD of .375

3/8 PEX tubing has an ID less than .375

My sample measured .330".

The goal is to slide a piece of 1/4" PEX *tube through a 1" length of
3/8" PEX tubing.

Using a crude jig and my drill press, I proved that it could be done.

PEX is soft and it melts if overheated.

Approximately 0.025" needs to be shaved from the PEX wall to increase
the diameter to .375".

What jig/drill/speed/step, etc. *would you suggest?

If you are only worried about the 1" length of 3/8" why not just drill
the 3/8" tubing out with a twist drill?
Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

Bruce,

That is what I did to prove the point.

The drill speed and feed were as slow as I could make it and it was
very difficult.

I believe that I will try 2 or 3 smaller size drills and nibble it
away to .375.

This job needs to be done on a lathe. If you don't have one, find one or job
it out to someone that does. It is too difficult to hold otherwise.
Steve

wrote in message
...
1/4" PEX tubing has an OD of .375

3/8 PEX tubing has an ID less than .375

My sample measured .330".

The goal is to slide a piece of 1/4" PEX tube through a 1" length of
3/8" PEX tubing.

Using a crude jig and my drill press, I proved that it could be done.

PEX is soft and it melts if overheated.

Approximately 0.025" needs to be shaved from the PEX wall to increase
the diameter to .375".

What jig/drill/speed/step, etc. would you suggest?


.

Get a 1/2/18 coupling nut. Weld a washer on one end. It is over
1" long, thread the pex into it. Hold the coupling nut in a drill
press vise or similar. Drill or ream to desired size.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)




wrote in message
...
1/4" PEX tubing has an OD of .375

3/8 PEX tubing has an ID less than .375

My sample measured .330".

The goal is to slide a piece of 1/4" PEX tube through a 1"
length of
3/8" PEX tubing.

Using a crude jig and my drill press, I proved that it could be
done.

PEX is soft and it melts if overheated.

Approximately 0.025" needs to be shaved from the PEX wall to
increase
the diameter to .375".

What jig/drill/speed/step, etc. would you suggest?


.