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Cutting a partial hole in a board question salad 03-15-2007
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Posted by salad on March 15, 2007, 7:29 pm


I have a brick wall, about a 1/2 foot high, that used to surround a
playset that got burned down. The brick wall had 2x10 boards on the top
of the wall that created a ledge.

There's metal bolts in the brick to hold the board down. In the current
burnt boards, the person that built it put a "sink", for lack of better
terminology where each bolt was located. IOW, a round hole was cut in
the board at each bolt location that went about 1 inch deep. I guess
this was done with a hole saw.

Let's say the holes were 2 inches in diameter, cut 1 inch deep, then the
next inch drilled creating a hole the bolt can slip thru. When I
tighten the bolt, the bolt will rest at the bottom of the 2 inch hole
cut I made.

If I cut a circle in the board and cut 1 inch down, how do I get that
piece out of the board? Do I use a chisle? Or do hole saws permit me
to create a "sink" that won't go thru the entire board?

Thanks for any advice you can provide.

Posted by dpb on March 15, 2007, 7:39 pm


> I have a brick wall, about a 1/2 foot high, that used to surround a
> playset that got burned down. The brick wall had 2x10 boards on the top
> of the wall that created a ledge.
>
> There's metal bolts in the brick to hold the board down. In the current
> burnt boards, the person that built it put a "sink", for lack of better
> terminology where each bolt was located. IOW, a round hole was cut in
> the board at each bolt location that went about 1 inch deep. I guess
> this was done with a hole saw.
>
> Let's say the holes were 2 inches in diameter, cut 1 inch deep, then the
> next inch drilled creating a hole the bolt can slip thru. When I
> tighten the bolt, the bolt will rest at the bottom of the 2 inch hole
> cut I made.
>
> If I cut a circle in the board and cut 1 inch down, how do I get that
> piece out of the board? Do I use a chisle? Or do hole saws permit me
> to create a "sink" that won't go thru the entire board?
>
> Thanks for any advice you can provide.

More than likely the former was done w/ a spade bit, but a Forstner
would provide a "cleaner" hole. A holesaw is a possibility, but at
least third down the list of choices.


Posted by aemeijers on March 15, 2007, 8:05 pm



>> I have a brick wall, about a 1/2 foot high, that used to surround a
>> playset that got burned down. The brick wall had 2x10 boards on the top
>> of the wall that created a ledge.
>>
>> There's metal bolts in the brick to hold the board down. In the current
>> burnt boards, the person that built it put a "sink", for lack of better
>> terminology where each bolt was located. IOW, a round hole was cut in
>> the board at each bolt location that went about 1 inch deep. I guess
>> this was done with a hole saw.
>>
>> Let's say the holes were 2 inches in diameter, cut 1 inch deep, then the
>> next inch drilled creating a hole the bolt can slip thru. When I
>> tighten the bolt, the bolt will rest at the bottom of the 2 inch hole
>> cut I made.
>>
>> If I cut a circle in the board and cut 1 inch down, how do I get that
>> piece out of the board? Do I use a chisle? Or do hole saws permit me
>> to create a "sink" that won't go thru the entire board?
>>
>> Thanks for any advice you can provide.
>
> More than likely the former was done w/ a spade bit, but a Forstner
> would provide a "cleaner" hole. A holesaw is a possibility, but at
> least third down the list of choices.

They sell 2" spade bits? Never seen one that big. Back when I did summer
labor building outdoor stuff, the auger they used for the threaded rod holes
had a wing thing at the proper depth to make the countersink. Didn't think
much about it at the time- probably a trade specialty item, rather than
big-box.

aem sends...



Posted by RBM on March 15, 2007, 7:41 pm


Some drills have an adjustable stop, which you set for the depth you want
the bit to go. If you drill half way through a board with a hole saw, you
can usually just pop the slug out with a screwdriver





>I have a brick wall, about a 1/2 foot high, that used to surround a playset
>that got burned down. The brick wall had 2x10 boards on the top of the
>wall that created a ledge.
>
> There's metal bolts in the brick to hold the board down. In the current
> burnt boards, the person that built it put a "sink", for lack of better
> terminology where each bolt was located. IOW, a round hole was cut in the
> board at each bolt location that went about 1 inch deep. I guess this was
> done with a hole saw.
>
> Let's say the holes were 2 inches in diameter, cut 1 inch deep, then the
> next inch drilled creating a hole the bolt can slip thru. When I tighten
> the bolt, the bolt will rest at the bottom of the 2 inch hole cut I made.
>
> If I cut a circle in the board and cut 1 inch down, how do I get that
> piece out of the board? Do I use a chisle? Or do hole saws permit me to
> create a "sink" that won't go thru the entire board?
>
> Thanks for any advice you can provide.



Posted by C & E on March 15, 2007, 7:58 pm



>I have a brick wall, about a 1/2 foot high, that used to surround a playset
>that got burned down. The brick wall had 2x10 boards on the top of the
>wall that created a ledge.
>
> There's metal bolts in the brick to hold the board down. In the current
> burnt boards, the person that built it put a "sink", for lack of better
> terminology where each bolt was located. IOW, a round hole was cut in the
> board at each bolt location that went about 1 inch deep. I guess this was
> done with a hole saw.
>
> Let's say the holes were 2 inches in diameter, cut 1 inch deep, then the
> next inch drilled creating a hole the bolt can slip thru. When I tighten
> the bolt, the bolt will rest at the bottom of the 2 inch hole cut I made.
>
> If I cut a circle in the board and cut 1 inch down, how do I get that
> piece out of the board? Do I use a chisle? Or do hole saws permit me to
> create a "sink" that won't go thru the entire board?
>
> Thanks for any advice you can provide.


I'm betting that the hole that holds the head of the bolt below surface
level is *not* 2". Most builders of these sets use spade bits - cheaper
than Forstners and adequate for the task - and most bolt heads probably
don't exceed 1". Determine the bolt that you will use and carry it over to
the bits and choose one that is just slightly bigger than the bolt head. If
you are using a washer under the bolt head (a good idea if the chosen bolt
is hex head as opposed to carriage) the bit will have to be big enough for
the washer size. Be sure you drill the large hole first to a depth slightly
deeper than the bolt head (+ washer, if used). Then, drill the bolt hole
through. Go slowly, and when you see the tip of the spade bit just barely
poking through pull the drill out and insert the tip through this little
hole and finish the hole. This will prevent tear-out or splintering as the
bit exits the wood. Oh yes, use galvanized hardware which is rust
resistance. Good luck on your project.



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