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I've thought about it several times but finally decided that my SDS drill is more than up to the job. And even with the general abuse it gets chiselling and sinking boxes its lasted years, so when it does die I think it works out much cheaper to buy a new SDS. Unless you're drilling lots of 100mm+ holes that is.
 
I've thought about it several times but finally decided that my SDS drill is more than up to the job. And even with the general abuse it gets chiselling and sinking boxes its lasted years, so when it does die I think it works out much cheaper to buy a new SDS. Unless you're drilling lots of 100mm+ holes that is.
Problem is, if you don't use a device with a safety clutch, and that core decides to jam, you can say goodbye to your wrists. I don't even want to think what would happen if you were up a ladder at the time :dead:
Of course ladders are only to be used for access, and not for actual working :wink_smile:
 
Problem is, if you don't use a device with a safety clutch, and that core decides to jam, you can say goodbye to your wrists. I don't even want to think what would happen if you were up a ladder at the time :dead:
Of course ladders are only to be used for access, and not for actual working :wink_smile:

Both my mains Bosch SDS and cordless Makita SDS have a mechanical slipping clutch, so no problems there. I would consider getting a dedicated core drill if doing more than a handful a year as large core drills put a big load on an ordinary SDS drill.
 
Core drills generally come in two forms: - 1) The conventional chuck type takes a hex arbor. 2) The threaded tool holder type takes a screw fit arbor. The former, allow you the flexibility of a standard drill. The later, higher torque of a direct drive at the expense of more laboured tool changing.
Of the chuck type the Makita 8406 is fine example, offerings from Dewalt and Bosch are better, but my personal favourite is the Milwaukee DD2-160XE.
Direct drive types are the professional choice however. The Marcrist DDM2 and DDM3 allow wet and dry cutting at fixed speeds. I have never felt the need for variable speeds when using one of these, I find them remarkably efficient when paired with the same make of core cutter. The Hilti DD120 and 130 being the firm favourites with my work mates, but a few of my colleagues still prefer to use the Milwaukee.

What ever you choose to buy, don’t be tempted to use an SDS drill to drive a large core cutter. The SDS tool holder is very inefficient when used in the hammer stop mode, a large core drill will quickly stress and wear the tool holder and ultimately destroy a SDS if it does not have thermal protection.

If you suspect your drill of getting excessively hot, stop drilling, switch to the max speed range and run it flat out for least 5 minutes in free air to allow the motor fan to cool the windings.
 
Last edited by a moderator:
Ended up with the makita 8406C 1400w 2 speed, next modle up from the 8406, looks a decent enough peice of kit.

Cheers

Ste
 
Ended up with the makita 8406C 1400w 2 speed, next modle up from the 8406, looks a decent enough peice of kit.

Cheers

Ste
makita are very good had 1 for years,quick tip for you when coring, drill straight through wall with a long bit same size as pilot on core then send core in much easier than letting pilot drill make its own hole,pilot bit runs through predrilled hole and keeps core central.
 

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