Dodgy trade pictures for your amusement! - 1 Million Views!

[swaRRR]

Arbors are available for this very purpose, which use a holesaw for original size as a pilot.

They're great provided the hole needs to be enlarged by more that a few mms.

You got a link to these?

 

[brianmoooore]

Arbors are available for this very purpose, which use a holesaw for original size as a pilot.

They're great provided the hole needs to be enlarged by more that a few mms.

You can often do this with a standard arbor. Just enough thread for a second holesaw inside the first.

 

[nicebutdim]

You got a link to these?

Starrett A19 Arbor for A1/A2/A10 : Amazon.co.uk: DIY & Tools

Starrett A19 Arbor for A1/A2/A10 : Amazon.co.uk: DIY & Tools

www.amazon.co.uk

https://www.amazon.co.uk/C-K-T3216-Hole-Enlarging-Adapter/dp/B0102DVPMQ/ref=sr_1_1?crid=2UYWZ6K7ZRGJF&keywords=c.k.+t3216&qid=1654993166&sprefix=c.k.+t3216%2Caps%2C72&sr=8-1

 

[telectrix]

"Can you come and have a look at my fret saw? Every time i switch it on, the breaker trips. I've tried changing the fuse in the plug, but it still trips."

Oh, that's odd...

View attachment 98488

I'd not fret about it. and it should be a 13A fuse.

 

[pirate]

Actually, Tel, it's only 120W, which surprised me...

 

[Midwest]

It's difficult to get a nice cut using a hole saw without using the pilot bit, unless you pre-cut a piece of ply to get a decent start the multi tool back box cutter is far easier imo.

Sorry don’t understand your question. I was just suggesting cutting an access hole into the plasterboard.

 

[brianmoooore]

Sorry don’t understand your question. I was just suggesting cutting an access hole into the plasterboard.

Cut a hole in a piece of plywood, throw away the circular piece you cut out, then hold the plywood against the ceiling, and use the hole as a guide for the hole saw.

 

[Mike Johnson]

Many ways to do this two as suggested by BrianMoooore above, used both methods, never needed a special arbor to do it, most standard arbours will take two hole saws.

 

[swaRRR]

Many ways to do this two as suggested by BrianMoooore above, used both methods, never needed a special arbor to do it, most standard arbours will take two hole saws.

Now i'm confused. I've never seen an arbour that will let you attach two hole saws at the same time?

 

[littlespark]

Now i'm confused. I've never seen an arbour that will let you attach two hole saws at the same time?

Some do, some don’t. Just depends on the length of the threaded part.

 

[123]

Now i'm confused. I've never seen an arbour that will let you attach two hole saws at the same time?

Some do, some don’t. Just depends on the length of the threaded part.

As per post #5904, Starret make something specifically for this, it's called an Oops Arbour. CK also do one. It replaces the pilot bit and means you enlarge a hole by using the original size holesaw as the pilot. Best use I've found for it is changing from the old spring downlights which are 64mm hole to the more modern versions which are anything from 70mm hole and up.

 

[ipf]

As per post #5904, Starret make something specifically for this, it's called an Oops Arbour.

For someone who's crapping themselves having drilled the wrong side holes..?

 

[nicebutdim]

Many ways to do this two as suggested by BrianMoooore above, used both methods, never needed a special arbor to do it, most standard arbours will take two hole saws.

No need for a fancy arbor in this instance, but holesaws aren't used exclusively to cut holes in plasterboard and not all arbors have sufficient thread to accommodate two cutters.

 

[mainline]

Starrett A19 Arbor for A1/A2/A10 : Amazon.co.uk: DIY & Tools

Starrett A19 Arbor for A1/A2/A10 : Amazon.co.uk: DIY & Tools

www.amazon.co.uk

https://www.amazon.co.uk/C-K-T3216-Hole-Enlarging-Adapter/dp/B0102DVPMQ/ref=sr_1_1?crid=2UYWZ6K7ZRGJF&keywords=c.k.+t3216&qid=1654993166&sprefix=c.k.+t3216%2Caps%2C72&sr=8-1

I can't see how you can easily start a hole in the centre of a joist, as the inner hole saw protrudes too much. ?

 

[nicebutdim]

I can't see how you can easily start a hole in the centre of a joist, as the inner hole saw protrudes too much. ?

I wouldn't use it in those circumstance, unless the ceiling was of sufficient depth to strart the new hole without cutting into the joist.

To my mind their real value is enlarging holes in sheet metal.

 

[Mike Johnson]

Their real value is enlarging holes in plasterboard for upgraded downlighter's and that is what everyone else is posting about.

 

[pc1966]

Their real value is enlarging holes in plasterboard for upgraded downlighter's and that is what everyone else is posting about.

In my limited experiance the problem are holes that are too big (e.g. old R80 lamp holders) so you can fit smaller LED downlights without getting extra covers, and even those sometimes won't hid the damage of getting the original out if crusted in paint, etc.

 

[Mike Johnson]

TLC have these for just such an occurrence in white, chrome or brass: LEDlite Hole Conversion Plate - White | LEDlite (LTHCP White) - https://www.tlc-direct.co.uk/Products/LTHCP.html

Or make a plasterboard cut out to fit and bond it to a cross piece inside the larger hole then make good around the edge, I have done both, but prefer the covers for convenience.

 

[loz2754]

In my limited experiance the problem are holes that are too big (e.g. old R80 lamp holders) so you can fit smaller LED downlights without getting extra covers, and even those sometimes won't hid the damage of getting the original out if crusted in paint, etc.

These are a good option for up to 100mm:

Integral LED Evofire Fire Rated Downlight 70-100mm

For safe, stylish and reliable lighting that's easy to install with a 70-100mm cut-out, this Integral LED EvoFire fire-rated downlight is the perfect choice. The ultra-thin 1mm bezel fits flush against the ceiling for a discreet and attractive finish, while the canless design helps the lamp run...

www.toolstation.com

 

[Baddegg]

Tumble drier, washing machine, dish washer that’ll be ok I’m sure……
Larger cable is feeding a double socket with wm td on and the smaller flex is for the dishwasher…..