Have tried fostner bits several times and on shorter holes they work but
build up to much heat. I have had charring in the holes when using fostner
bits even at low speeds, not often but a few times. With a hole of this
length (8") I have to make several passes or drill from both ends and the
fostner bits do not give as smooth of a shaft as the spade bits for this.
Main problem with the fostner bits is heat build up at depth which I seem to
have gotten anyway in this case.
Ok, this really happened to me. I was drilling a blank for a pen into some
slightly green hardwood (I don't remember what, something tropical) and
about 3/4 of the way through, the wood exploded. I mean BOOM! Splinters
everywhere. If it weren't for the steam coming off the drillbit I never
would have guessed that the moisture in the wood would flash to steam and
blow up the workpeice.
I have had similar things happen in wood that "I thought" was dry, but
always in deep holes (3' or more) with twist bits under 3/8" in dia Just a
popping sound and a spray of dust and steam. Never had one come apart but
then I use larger blanks of wood then you would use for a pen. This time it
was a spade bit and left ash. on my shirt and glasses. This could have been
a steam explosion,but it was a weird one if it was. Wood might have
shattered if it had been a twist bit?! 8(
It does make you want to stop working for a minute though and ponder life,
doesn't it. I wonder how many other strange and secret events happen in
wood shops that you never hear about? It's all part of the fun of working
with a living material.
I don't know. I never thought of doing it is the only reason I can give. I
have a good set of auger bits and a good brace setting on the wall
collecting dust. Tomorrow I will get them out dust them off and give them a
try. I will be cutting in end grain but they should do the job and be
cleaner then the spade bit to boot. Thanks for the tip.
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