4" ---> 6" core cut conversion

[sythai]

Hello Everybody...

Just seeing if anyone has ever had the pleasure of carrying out the following.

Have existing fan in place with 4" core hole, but need to increase to 6" as existing fan is inadequate for size/type of room.

Unfortunately this isn't your standard 'easy-peasy' block wall, but 100 year old brick wall in the basement of a 4 storey house approx 500mm thick. The old bricks round here can be challenging at the best of times!

Did suggest a centrifugal fan, but they dont want anything to bulky.

Any thoughts suggestions would be greatly appreciated (FYI - unable to core new hole has to be same location.)

Thanks Sy

 

[HandySparks]

OK, you can't use a pilot to centre a core drill, but how about temporarily fixing some wood to the wall to position the core drill?


Edit: Either a board with a 6" hole or just three or four pieces of batten.

 

[telectrix]

is it possible to fit a 4" and a 6" core bit at the same time? then the 4" would guide the 6".

 

[a1colly]

4" ---> 6" core cut conversion

Start your core on an angle creating a bottom grove then level out to creat your path.

 

[steve.b]

12in x 12in x 1in chipboard,fixed over 6in hole,mark center, drill hole in center (same size as drill in core cutter),proceed to drill with core cutter.


edit:just seen post 3!!!!

 

[sythai]

is it possible to fit a 4" and a 6" core bit at the same time? then the 4" would guide the 6".

OK, you can't use a pilot to centre a core drill, but how about temporarily fixing some wood to the wall to position the core drill?


Edit: Either a board with a 6" hole or just three or four pieces of batten.

Great thank you, think a combination of these 2 should do it

Sy

 

[High Tower]

Use a piece of 6" duct to draw a pencil line , chisel around the pencil line, this will gone you a beveled outline that the 6" core will start up in, once you have it started its plain sailing from there

 

[Rockingit]

4 bits of batten screwed to make a 6" frame around where you need to go in order to stop the core jumping around when you present it. Once it's dug in you're home and dry.

 

[telectrix]

knock out a rough square hole 10" x 10". stick in 6" duct. fill round with expandy foam. go to pub while foam sets.

 

[sythai]

Seems like a lot of chaps may have done this before..... always nice to learn a new 'tip of the day'

 

[sythai]

knock out a rough square hole 10" x 10". stick in 6" duct. fill round with expandy foam. go to pub while foam sets.

Dont get me started on the foam.... think I've got a fetish with that stuff, any excuse and the old foam gun is out :ihih: You'll be surprised what I've managed to sort with it

 

[ChrisElectrical88]

is it possible to fit a 4" and a 6" core bit at the same time? then the 4" would guide the 6".

That would be what I would be doing... Well not really... Id be walking away think **** that for a bag of chips!!

 

[R G]

You could cut a 100mm hole in an old brick wall and use the plug in the hole with some fixings set about an inch or so in , that would get the hole started after that the plug could be removed then carry on ..

 

[JulianC]

I have seen a 6" core in use with a 4" pilot core for exactly this job. Never seen the kit for sale anywhere though!

I'd still be tempted to go for a centrifugal 4" fan, but one that can be recess mounted perhaps? Something like a Nuaire Genie doesn't look too bad with most of it sunk into the wall.

 

[PEG]

You can adapt a 4" core bit to use as a guide centre to the 6" but once your 10mm in using methods listed above,all is well....but i can give you a great tip i have used in differing circumstances to good effect in the past. Set up your laser level or similar (surely we all have one these days...) so it's dot marks the centre of your hole. Marker pen a dot on the rear or handle of the drill,that is aligned with the axis of the chuck. This keeps you true and straight as if there is any depth and you wander back and forth,the core bit binds up and you'll cook an egg on your clutch. I have used this for lots of free-hand drilling/boring,and it is bob on. If you have facility on your level for setting inclination,it will follow that too. Right,i've bored you enough,good luck.