Dennis — don’t forget the method of stacking hole saws of different sizes on one mandrel. If you have an existing 1-1/2” hole and need it to be 1-7/8”, you can often slide the smaller hole saw into the larger one and put them on the same mandrel; the smaller saw (original hole size) will often stand proud of the larger hole saw enough to act as a guide to start the new cut.
— Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Jan 19, 2018, at 7:52 AM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > Sometimes we're faced with enlarging an existing hole. There are a couple of > recognized ways to provide an "anchor" to center the pilot bit on a hole saw. > The most common way is to secure a piece of scrap wood over the hole (behind > or in front) and then drill the new hole. A second way is to cut a plug, > place it in the hole and secure it with spray foam, etc. > > Well, I had to enlarge a hole on Touche' and I thought neither of the above > methods would work. I dreamed up another method which I've never seen in my > web research. Here's a link to my write up. Perhaps someone will find it > useful someday. > > https://drive.google.com/open?id=1I84iwQstTrzPcvQf2lNEWi8xeGDPcHaH > <https://drive.google.com/open?id=1I84iwQstTrzPcvQf2lNEWi8xeGDPcHaH> > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA
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