152mm Core Drill - Blunt?

eveares

eveares

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Just bought this off eBay for £35 inc P&P (Included hex arbour kit not shown) as I need to drill a 6"/150mm hole through a wall for a short piece of 6"/150mm (External diameter 156mm) solid ducting what is to be used as a exhaust outlet for a portable AC Unit.

[GALLERY=media, 100058]152mm Core Drill by eveares posted 18 Jul 2017 at 9:52 PM[/GALLERY]

[GALLERY=media, 100059]152mm Core Drill Tooth by eveares posted 18 Jul 2017 at 9:52 PM[/GALLERY]

Now the brand is SilverLine and the box says it is "diamond core", however the amount of effort to get through a bit of 6mm plywood as test for the hole size was unbelievable!

Is this because the core drill is blunt and a knock off OR just because the plywood was to soft to grind away at?

The wall I am am hopefully going to be drilling through tomorrow is breeze block with insulated plasterboard on the inside and smooth render on the outside. Using my 18V Dewalt cordless drill.

Regards: Elliott
 
Can't see that clearly, but it doesn't look as though there aren't many diamonds in it. Silverline are normally cheap, but basically okay, so I think you've got a knock off there.

Having said that, I'm not surprised you can't get through the plywood; too soft to be ground away. Wait to see what happens on the breeze block.
 
You would be better off hiring a rig.
You'll realise that when you've burnt out the cordless. You can sell the core on ebay.
 
A dry diamond corer won't cut wood for toffee, too smooth a surface. A diamond core needs a hard surface to keep the diamonds in the segments exposed, all the wood will do is create too much heat and polish the surface.
You may need to chap those segments up, looks like they have become smooth and the diamonds need to be exposed again. Cold chisel, and chap light marks into the segments if you find it won't bite, or a senior hacksaw and roughen them up.
If the corer jams then you may break your thumb/wrist, you need a clutched drill, not a cordless!!
 
You'll ruin your drill if you're trying to do it with a cordless. You need a proper mains powered core drill with a clutch.
 
Use a jigsaw and cut the hole if you need a guide
The core drill is made for cutting through Brick,block and wilm definetly struggle through wood and also steel !!
 
when you are cutting through a timber kit house you go through plaster board, and the insulation then hit the Ply, it takes ages and takes the life out of the core until it gets to the block or brick then it can do what it was designed to do.
 
yes, I am afraid you are using a questionable quality core with a totally incorrect drill and trying to test it against an unsuitable substrate. apart from that what could possibly go wrong?
 
Come on guys,give the poor guy a break. He's learnt not to try a core drill on ply, so he'll know better next time. He's only going into breeze block, so as long as it's not a £30 Lidl cordless drill, it may well cope, and there's only 20mm of render at the end so it might well survive. At the end of it, if the drill burns out, he'll know to get a better drill next time, so it'll have been a good learning curve all round for him.

EddieM said:
apart from that what could possibly go wrong
Click to expand...

There are some questions you just shouldn't ask.
 
Last edited by a moderator:
Doggit said:
Can't see that clearly, but it doesn't look as though there aren't many diamonds in it. Silverline are normally cheap, but basically okay, so I think you've got a knock off there.

Having said that, I'm not surprised you can't get through the plywood; too soft to be ground away. Wait to see what happens on the breeze block.
Click to expand...
This made me laff; the thought that someone could clone a 'Silverline' product!! Now, that would be scraping the barrel....:D
 
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