Drill Bit Size for 15mm copper tube

[wxs]

Hello
I want to order a drill bit for drilling a hole for 15mm Copper tube in steel wants to be an exact fit. correct size please.

Thanks

Ron

 

[kjacko]

Well, i'd imagine a 16mm, unless you can find an exact imperial drill bit.

I would also imagine if you used a 15mm drill bit and slightly filed out enough to get the pipe through, then if it has hot water through it you could be in trouble?
just a theory though.

 

[plugwash]

I'd think 16mm would be too large but it really depends on what the tolerance of your tube is and how you are planning to fit it in the hole.

BTW if you need an acrurate hole size it's best not to make it in one step, it's better to drill an undersized hole (say 14mm) first and then drill it out to the final size as drills tend to wobble when removing lots of material. For really high accuracy you may want to consider a reamer for the final step.

 

[WabbitPoo]

Why is this in the Disasters section?

 

[mattylad]

Perhaps because if its too big it will be a disaster. lol

 

[merlin50]

19/32 drill or 39/64 simples

 

[big-all]

why do you need such an accurate sized hole you may as has been said be storing up problems

 

[ldoodle]

My parents had their central heating put in about 5 years ago (was a hot air system before), and what the installers did was drill holes through the bricks big enough for 20mm copper so that was nice a tight, then threaded the 15mm copper through the 20mm.

Obviously where 20mm pipe was actually needed they used the next size up for the 'container' pipe.

 

[mysteryman]

You would not want 15mm pipe tightly fitted through steel. The installers did a good job there.

 

[k13wjd]

drill a 14mm hole. Reem the rest out until the pipe fits.


Simples.

 

[kirkgas]

pipes should be sleeved through anything to allow for thermal expansion and contraction, so get a pipe bigger than the pipe you are fitting and drill a hole to suit the bigger pipe

 

[noddy997]

you dont want a "perfect" or "tight" fit, 16mm for a 15mm is not too big 1mm is not much.

Mind you, I recently put in a wash hand basin in a WC with the bathroom nextdoor, and drilled a 16mm for the 15mm hot water pipe to run through. the WC had a cold feed from the bathroom anyway but the cold feed pipe was a "perfect fit" however the cold doesnt "contract and expand" as the hot pipe would

PLus a 15mm pipe vs 15mm hole you'd most like be forcing it through as it will be relatively tight.

 

[k13wjd]

if he's doing something that needs a tight fit, then he might a tight fit as a seal.

I've used copper into alloy blocks for engine builds, and indeed into brass for turbos. I normally drill them on the small size,then freeze the copper, and tap it in with a soft drift. you'll be better of using a set of vernier calipers to measure the pipe, and drill to that size, before using a honeing stone or similar.

google interference fit

 

[hazetimesfive]

i have no idea what this is about...

 

[mattylad]

Then why did you reply to a post that is several months old with that?