You need a clutch as it can slip when core bit gets stuck [it will] or you break your wrist . Broke my little pinky when dril jammed with just a 3/4" hss bit in it, imaginee tork from a 4" core bit.
Drill for 4" core drilling
- Thread starter Aqua
- Start date
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Larger cores need much lower speeds than ordinary drills are geared for, and higher torque than the clutch is set for.
I was thrown of a ladder not long back when using a large drill without a clutch, no damage done but a lot of that was luck.
Aqua,
I bought a Bosch SDS with clutch a few years back for around £100. It is the model which is rated at around 720 watts I recall.
I bought it specifically as a SDS back-up and to do cores as I, like you, maybe do 5 a year. It has been fine up to now, maybe a bit slower than a core drill but nevertheless adequate. I found it tends to be more awkward when doing large cores over 100mm, and you have to keep the drill well positioned to stop the clutch going crazy. That will relate to Monkehs higher torque comment..
You should defo get yourself a SDS - it will change your life!
I bought a Bosch SDS with clutch a few years back for around £100. It is the model which is rated at around 720 watts I recall.
I bought it specifically as a SDS back-up and to do cores as I, like you, maybe do 5 a year. It has been fine up to now, maybe a bit slower than a core drill but nevertheless adequate. I found it tends to be more awkward when doing large cores over 100mm, and you have to keep the drill well positioned to stop the clutch going crazy. That will relate to Monkehs higher torque comment..
You should defo get yourself a SDS - it will change your life!
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Thanks for all the comments and advice, i'll try and get a proper Diamond Core drill. I dont fancy getting broken fingers or wrist and by the sounds of it that type of drill will be handy for putting big/long masonery drills through walls when the need arises.
Not exactly, but that drill rather pales in comparison to a true core drill: http://www.marcrist.co.uk/products/machines/ddm2.aspx
I don't own one, but I've hired one for use several times. They work well.
Is it too late to sue Makita under the trades descriptions act? The 8406 is an excellent drill for coring.
I use Marcrist after several years of messing around with other makes that turned out to be not up to the job, the first job I did was to put two extractor fans in a stone building, 1 metre thick walls, no problem!!
As said at the start of the post, i rarely have to drill cores but all the same wanted something up to the job and affordable to me.
So today i took delivery of a Makita 8406, not new but a good condition second hand unit from a private seller, not an ex hire firm drill or something that's been kicked around site by everyone.
I'll be putting a 4" core through this week so it will get a good test of the machine.
Thanks to everyone for their comments
So today i took delivery of a Makita 8406, not new but a good condition second hand unit from a private seller, not an ex hire firm drill or something that's been kicked around site by everyone.
I'll be putting a 4" core through this week so it will get a good test of the machine.
Thanks to everyone for their comments
I bought an AEG core drill a couple of years ago for £190 new. Its at another house at the mo, so not sure of the exact model number, but its very similar if not identical to the AEG DB15002XE. 1.5Kw and 110v. Has a clutch which works fine and a long and configurable side arm handle (with a castellated interlocking grip of the body so it can't spin when the core jambs) for a good grip with larger dia cores. It'll put a 150mm core drill through a 10" thick solid brick wall without a problem. Its been used a fair bit but how it would hold up to pro use I'm not sure. It doesn't have a pro feel to me. 3 jaw chuck but that's not a problem with all the adaptors around today.
As a comparison I have a Metabo UHE28 Multi as a main drill which as an all round SDS drill has been the dogs back wheels. 1kW in and about 660W at the chuck I think. Has a clutch for coring and upto about 42mm dia its fine. Once after a couple of hours use at 42mm it got hot and shutdown for a while. But beyond 42mm it quickly lets you know that its time for something bigger.
The clutch not only saves you busting your flippers but also protects the core drill aswell.
Core drill performance is very dependent on medium.
As a comparison I have a Metabo UHE28 Multi as a main drill which as an all round SDS drill has been the dogs back wheels. 1kW in and about 660W at the chuck I think. Has a clutch for coring and upto about 42mm dia its fine. Once after a couple of hours use at 42mm it got hot and shutdown for a while. But beyond 42mm it quickly lets you know that its time for something bigger.
The clutch not only saves you busting your flippers but also protects the core drill aswell.
Core drill performance is very dependent on medium.
just as a foot note, the only criticism I have of the Marcrist is that the side handle isn't as long as I would like, so I use the one from my old Milwaukee, (the only bit of the Milwaukee worth keeping in my opinion), oh and the plastic case is a bit naff
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