[Coral-List] Underwater Drill

Michele & Karl michka at fellenius.net
Tue Feb 20 16:39:23 EST 2007

In case you decide to reconsider the low tech, low cost hand drilling.
Manual drilling in old coral rock becomes relatively easy if one diver
pushes on the drill while the other one turns the handle. Both divers need a
hand hold of sorts in a reef crevice, but that's usually easy to find. We
used to drill 2 cm wide holes 20 cm deep this way. Start with one or two
smaller diameter drill bits if the rock is solid. Normally took us less than
3-5 minutes per hole. I suppose it will depend on how solid your pilings

Reef Solutions Vanuatu

----- Original Message ----- 
From: <aj.martignette at comcast.net>
To: <coral-list at coral.aoml.noaa.gov>
Sent: Thursday, February 15, 2007 12:25 AM
Subject: [Coral-List] Underwater Drill

>I have to drill some holes in pilings for large bolts that will be used to
>mount water quality sensors. I would like to avoid having to drill them
>with a hand drill. I know that you can use a pneumatic drill hooked up to a
>scuba tank. I was wondering if anyone had details on a setup they use and
>any modifications that are needed to the drill.
> Thanks
> A.J. Martignette
> Research Assistant
> Marine Laboratory
> Sanibel-Captiva Conservation Foundation
> 900A Tarpon Bay Rd.
> Sanibel, Fl 33957
> _______________________________________________
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> Coral-List at coral.aoml.noaa.gov
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