Enlarging a round hole

Hi All, I'm fitting an extractor fan in our kitchen and have a little problem with the hole it will extract through. To make the hole I hired a diamond core cutting tool from HSS and used the largest bit about 6". Having bought the extractor and sleeve the hole needs to be slightly bigger to accommodate the sleeve. Any advise on how I can neatly increase the size of the hole. For example is there such a drill bit that effetely files the brick away.

In hindsight I should have bought the sleeve first and measured it rather than relying on the 6" quoted on the front of the extractor packaging.

Thanks Martin.

Reply to
Martin
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Faced with this problem some years ago, I bodged the sleev to a smaller size :-(

Rick

Reply to
Rick

Use a scutch chisel with hammer, to gently and neatly nibble away the required brickwork. Wonderful tools.

David

Reply to
Lobster

draw aroung the ducting on the wall where its going then, Drill severa

little holes, close together with a SDS drill or rotary hammer then us a small brick chisel on the spaces between the holes

-- vonryan

Reply to
vonryan

It's amazing what you learn here! In my 45 years of DIY, I'd never heard of a scutch chisel until today!

Is the idea that, with its serrated end, it will dig in and allow small quantities of material to be removed in a controllable fashion - whereas a plain chisel would glance off?

Reply to
Set Square

Great Thanks.

I have an SDS drill with hammer only mode can you get a scutch chisel for an SDS?

Mart>

Reply to
Martin

(Effetely? Absolutely nothing more brutal than a nail-file, dear.)

If you have an SDS drill, a toothed chisel would probably do it - though it's obviously less gentle than a hand tool. In the longer term, it will also be useful for chasing slots, sinking boxes and removing whole bricks.

Reply to
Ian White

Nah, don't think so: the whole point of using a scutch chisel is it's for pretty delicate, almost fine-tuning work; sticking one in an SDS machine would be self-defeating.

David

Reply to
Lobster

Exactly that. I'd never heard of them either till quite recently; it was a joiner watching my efforts at forming a doorway in a brick wall who put me onto them. The combs themselves are disposable and fit in either chisels or directly into hammers; personally I prefer the chisels.

David

Reply to
Lobster

Depends on your SDS... with a very the good speed control on my one I can be far more delicate with that, than with a lump hammer!

Reply to
John Rumm

Vonryan, change your name to Osmium, it's far more appropriate.

Reply to
Matt

You want one of these you do ;-)

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Reply to
YTC449

local electrician, only to find out that what had actually been recommending was a square-ended one (still with 3-4 TC teeth).

Comparing the two, they would be about the same for removing bricks and chasing slots, but the square chisel is definitely much better for box sinking because it's very easy to make flat-bottomed cuts. At a guess, the square one would probably be better for this particular job as well.

Reply to
Ian White

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