Core drill question

[thezappa]

So I bought a core bit (a dry diamond one no less). I’ll borrow an SDS drill since what I’m using it for is for 1 hole, a vent for the tumble dryer.
The questions I have are what size arbor do I need, and what else do I need?
I’m trying to do this as cheap as possible so if I can get away without spending on loads of extra bits that’s all good.

This is the bit I have:

This is the size of the threaded section at the top:

 

[norm]

To be honest if you wanted to do it as cheaply as possible hire the core drill bit and accessories from your local hire shop.

Is it possible you can return the bit you've purchased?

 

[Werewolf]

This looks like the one an ABDCA3 SDS ADAPTOR 10MM X 115MM I'm not sure where you'd get it on it's own at bricks and mortar stores, but you might want to look at getting the kit that also has a guide bit that goes in the adaptor (makes it easier to use), and that looks to be slightly more readily available

Abracs ABDCAMIX Dry Diamond Core Accessory Pack (6 Piece)

The Abracs ABDCAMIX is the complete range of accessories giving you everything you need for use with Abracs Dry Diamond Cores.

www.toolstop.co.uk

 

[thezappa]

To be honest if you wanted to do it as cheaply as possible hire the core drill bit and accessories from your local hire shop.

Is it possible you can return the bit you've purchased?

Unfortunately no. I bought it ages ago. It was £17 so not the end of the world. I mistakenly bought it and didn’t realise I needed extra stuff.

This looks like the one an ABDCA3 SDS ADAPTOR 10MM X 115MM I'm not sure where you'd get it on it's own at bricks and mortar stores, but you might want to look at getting the kit that also has a guide bit that goes in the adaptor (makes it easier to use), and that looks to be slightly more readily available

Abracs ABDCAMIX Dry Diamond Core Accessory Pack (6 Piece)

The Abracs ABDCAMIX is the complete range of accessories giving you everything you need for use with Abracs Dry Diamond Cores.

www.toolstop.co.uk

Thank you. I have seen that kit but I had hoped I could get say 1 extra ‘thing’ but kept reading about ‘drifts’ and got a bit confusing.

 

[JRJ]

To be honest if you wanted to do it as cheaply as possible hire the core drill bit and accessories from your local hire shop.

Is it possible you can return the bit you've purchased?

100% this, half day hire at my local hire shop with drill bit was £28.

You won't want to drill through block with a regular SDS drill either, a nice beefy drill with safety clutch should stop you snapping your wrist or getting throw off a ladder when it jams.

 

[JRJ]

Unfortunately no. I bought it ages ago. It was £17 so not the end of the world. I mistakenly bought it and didn’t realise I needed extra stuff.



Thank you. I have seen that kit but I had hoped I could get say 1 extra ‘thing’ but kept reading about ‘drifts’ and got a bit confusing.

Abracs ABDCA3 SDS Adaptor 10mm x 115mm

ABDCA3 10mm x 150mm SDS AdaptorAbracs Accessories

www.powertoolsuk.co.uk

Abracs ABDCA6 Drift Key

ABDCA6 Drift KeyAbracs Accessories

www.powertoolsuk.co.uk

Abracs ABDCA5 Taper Pilot Drill 13mm x 200mm

ABDCA5 13mm x 200mm Taper Pilot DrillAbracs Accessories

www.powertoolsuk.co.uk

Individual items if needed.


A drift key is just a means of knocking out the drill bit from the adapter, they fit together by friction as opposed to a grub screw or similar.

 

[Mysterae_]

If I could offer a bit of advice, once the core drill has made a bit of progress in the brick remove the pilot drill and then continue drilling with the core drill. I agree with @JRJ, you want a drill with a safety clutch as it will catch numerous times. Also if you have cavity wall insulation then you'll have two sets of bricks to go through and depending on the type of insulation you'll either have a snow storm or get the drill tangled in the fibre insulation.

 

[RedMogg]

If I could offer a bit of advice, once the core drill has made a bit of progress in the brick remove the pilot drill and then continue drilling with the core drill. I agree with @JRJ, you want a drill with a safety clutch as it will catch numerous times. Also if you have cavity wall insulation then you'll have two sets of bricks to go through and depending on the type of insulation you'll either have a snow storm or get the drill tangled in the fibre insulation.

I had this exact issue - I drilled through both walls with a 24" 10mm bit, so the core drill holes lined up perfectly.

I hired the drill for a half day and used it to install three tumble dryer vent kits in the lounge and both bedrooms, then found a hose adapter for our portable Aircon units. I sealed the vents in place with expanding foam.

Having the A/C vent straight out and not need a window open meant they were quieter and much, much more effective at cooling the house.

Pics: https://imgur.com/a/andgyhG

 

[Syla5]

Having the A/C vent straight out and not need a window open meant they were quieter and much, much more effective at cooling the house.

Pics: https://imgur.com/a/andgyhG

Looks like a decent job, just curious how it made the AC quieter? Or did you just mean generally through no extra external noise coming in?

 

[thezappa]

If I could offer a bit of advice, once the core drill has made a bit of progress in the brick remove the pilot drill and then continue drilling with the core drill. I agree with @JRJ, you want a drill with a safety clutch as it will catch numerous times. Also if you have cavity wall insulation then you'll have two sets of bricks to go through and depending on the type of insulation you'll either have a snow storm or get the drill tangled in the fibre insulation.

Thank you, and noted.
I’m drilling through single skin brickwork, a division between the old garage (now utility and the other garage). The depth of the bit should be more than the depth of the bricks.
I will likely hire a drill, the local place has some beefy Makitas that will do the job.

 

[thezappa]

Abracs ABDCA3 SDS Adaptor 10mm x 115mm

ABDCA3 10mm x 150mm SDS AdaptorAbracs Accessories

www.powertoolsuk.co.uk

Abracs ABDCA6 Drift Key

ABDCA6 Drift KeyAbracs Accessories

www.powertoolsuk.co.uk

Abracs ABDCA5 Taper Pilot Drill 13mm x 200mm

ABDCA5 13mm x 200mm Taper Pilot DrillAbracs Accessories

www.powertoolsuk.co.uk

Individual items if needed.


A drift key is just a means of knocking out the drill bit from the adapter, they fit together by friction as opposed to a grub screw or similar.

Thank you. Seems a drift key is slightly superfluous.

 

[Terminal_Boy]

You’ll need a 1500W drill to drive that.

 

[Mercenary Keyboard Warrior]

Just a tip but if its a proper tool hire place you should hire the core drill, and the diamond will be charged based on usage
If your drilling one hole and its not hard brick you basically would be very unlucky to use any detectable amount of diamond, its generally charged per mm, ask before hiring every diameter bit will have a different rate

Best bet is to go to a trade based tool hire place, Speedy are national for example rather than a high street one such as HSS
Speedy are also in some B&Q. Many of the big trade based building suppliers also have tools to hire, such as jewson but IMO your best placed going to a proper tools depot, they tend to be better equipped.

I would 100% use a proper core drill for this, I used to work in toolhire and some of the stories of people damaging their wrists etc from trying to use a normal drill were eyewatering.

 

[Puzzled]

I had this exact issue - I drilled through both walls with a 24" 10mm bit, so the core drill holes lined up perfectly.

I hired the drill for a half day and used it to install three tumble dryer vent kits in the lounge and both bedrooms, then found a hose adapter for our portable Aircon units. I sealed the vents in place with expanding foam.

Having the A/C vent straight out and not need a window open meant they were quieter and much, much more effective at cooling the house.

Pics: https://imgur.com/a/andgyhG

Looks tidy.

You noticed any difference in room temperature in Winter? Tricky to vent a portable A/C unit out the window in our bedroom but wouldn't want to let more cold in over the winter months.

 

[Mysterae_]

Thank you, and noted.
I’m drilling through single skin brickwork, a division between the old garage (now utility and the other garage). The depth of the bit should be more than the depth of the bricks.
I will likely hire a drill, the local place has some beefy Makitas that will do the job.

I wasn't as lucky as I had double skin to go through but it was bitter-sweet as I was expect plastic bead insulation only to find it empty. Here's my effort when I was putting in a hole for a bathroom vent piping:

For reference, my drill above is a Makita HR2631FT SDS and although only 800w and spec'd a maximum of 80mm holes in concrete with a diamond core bit, it worked fine cutting the 117mm hole but may have taken longer than it should. It's not been said yet but don't use the hammer function of the drill as it'll knacker the core drill and vibrate the life out of you.

Seems a drift key is slightly superfluous.

The drift is for knocking out the drill bit from the arbour as it will get stuck solid!

 

[RedMogg]

Looks like a decent job, just curious how it made the AC quieter? Or did you just mean generally through no extra external noise coming in?

That, and the units weren't fighting to expel the hot air through a longer hose, or compete with the warm air seeping back in through an open window