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Keyed drill chuck...why?

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jordec66

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Hi and happy new year all,

I am looking to replace my aged Makita SDS , and had the idea of buying a core drill which could double as an everthing drill. I have seen a reasonably priced Sparky in Screwfix which will cut 152mm cores but has a keyed chuck. Anyone know why core drills have to be keyed? I've googled a few and they all have keys.

Thanks
Declan.
 

Steve Maskery

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I think it is likely that the forces on a core bit are considerably larger than a drill, due to the greater circumference. I suspect that a keyless chuck cannot tighten as firmly as a keyed one.
S
 

WoodMangler

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I have a modern Makita drill with a 1/2" keyless chuck, and an ancient Black & Decker with a 3/8" keyed Jacobs chuck. I find that the B&D will often hold onto a drill which slips in the Makita, especially when breaking out at the end of drilling a hole in metal.
 
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