110mm hole through outside wall

[rfisher]

What's the best way to drill a 110mm diameter hole through an outside wall?

Fitting an extractor fan and I don't want to cough up £40 for a tungston carbide hole saw.

I've got several masonary bits long enough to go through brick and breeze block in 1 go so I was planning to drill several smaller holes and chisel them into 1 large one.

No?

[buggalugs]

I've done the chain drilling thing before for a tumble drier vent, worked it quite well. You need a decent drill though, a mains SDS or something otherwise it'll take you all day! (ask me how I know this... )

[sleep envy]

rfisher said:

I've got several masonary bits long enough to go through brick and breeze block in 1 go so I was planning to drill several smaller holes and chisel them into 1 large one.

No?

you can do it that way but it'll be messy and take ages

[sherman]

Ebay currently has one at £11

[homeimprovements]

Dont mess about, go to your local hire shop and hire a diamond core bit or you will be there forever. Shouldnt cost you more than about 25 for a couple of hours. Make sure the drill you use has a safety clutch, else you may end up visiting casualty. Where abouts are you in the country?

cheers
Nigel

[mycroft]

rfisher said:

What's the best way to drill a 110mm diameter hole through an outside wall?

Fitting an extractor fan and I don't want to cough up £40 for a tungston carbide hole saw.

I've got several masonary bits long enough to go through brick and breeze block in 1 go so I was planning to drill several smaller holes and chisel them into 1 large one.

No?

Yes , done this many times . I have diamond core bits but they are not always perfect for the job , if your on a ladder with a drill big enough to drive a 110mm bit and it snatches ( as they tend to ) Its not allot of fun .
Tip is to drill your chain of holes with a small drill first and expand them gradually , this will save you chiseling as much once the core is out .
Good choice of car

[Simpo Two]

I did the 'ring of holes' method a few months ago with a mains SDS drill. It's not too difficult but makes a hell of a mess and the other side of the hole can break out badly as the drill exits (but that may well be covered by a flap/cover later)

I wouldn't even think about using an 'ordinary' hammer drill, you'll be there for days.

[K50 DEL]

I hired a diamond tipped core drill for a few hours, cost me about 20 quid but had the hole drilled neatly and in short order, it just wasn't worth the hassle to do it any other way.

[rfisher]

mycroft said:

Good choice of car

04 the best!

Tam and an S3 -

Always fancied getting another 350i before they've all gone to TVR heaven.

Maybe I shouldn't wait and just get 1 while I still have the Tam.

[rfisher]

sherman said:

Ebay currently has one at £11

Got the listing number?

Thanks.

[sherman]

rfisher said:

sherman said:

Ebay currently has one at £11

Got the listing number?

Thanks.

http://cgi.ebay.co.uk/GOOD-QUALITY-110MM-CORE-DRILL_W0QQitemZ350050795432QQcmdZViewItem

Its now at £12 BTW

[V12Les]

rfisher said:

sherman said:

Ebay currently has one at £11

Got the listing number?

Thanks.

Just bear in mind with these,(like most things)you get what you pay for. Mine cost up in the hundreds for a reason.
Your best bet is the hire shop for core and the drill.

[Fatboy]

Get one of these to hit it with armour piercing shot, should make a circa 110mm hole.



Disclaimer: this may cause slight damage elsewhere in your street

[lewes]

Its got to be Core Drill every time, neat and easy.

If youre worried about doing this from a ladder, why dont you drill from inside the property ???