Jerry Adams
Member
I need to drill some blanks but I don't have the required "O" drill bit. Would it be ok to use a 21/64 ? I use gorilla glue to glue up the tubes?
Drill Bit Help Needed
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Can't answer specifically,I have not used poly glue for tubes.I know it has gap filling properties.
That being said, a real hardware store will carry an "O" bit,it's a standard size.
As far as reccomended drill bit sizes goes.
I always try the reccomended bit first, but I have purchased the reccomended sizes from suppliers and found the hole too small for even the tube let alone glue.
Often times when drilling a cross cut or bias cut blank I have found a larger size bit is needed for some reason.
On mer consideration is which kit you are using.
With an oversized bit some bushings don't give you much "meat" around the tube.
I would try to find the correct bit first.
(your mileage may vay)
That being said, a real hardware store will carry an "O" bit,it's a standard size.
As far as reccomended drill bit sizes goes.
I always try the reccomended bit first, but I have purchased the reccomended sizes from suppliers and found the hole too small for even the tube let alone glue.
Often times when drilling a cross cut or bias cut blank I have found a larger size bit is needed for some reason.
On mer consideration is which kit you are using.
With an oversized bit some bushings don't give you much "meat" around the tube.
I would try to find the correct bit first.
(your mileage may vay)
I use the 21/64 everywhere a manufacturer suggests the "O" size and with no problems. I also use a 9/32 instead of a 7mm. Poly glue will take care of the .01" difference in diameter. I find it amusing that the kit manufacturers's instructions will sometimes mention a 2-1/4" barrel, an 8mm tube and an "O" drill bit. Wouldn't you think that just one of them could keep their "language" the same?
Jerry Adams
Member
Thanks Lou [
] . That was the answer I was hoping to get.
] . That was the answer I was hoping to get.dougle40
Member
Personally I would shop around and find an 8mm drill rather than rely on the poly to make up .012 in size !! .012 is a lot for the glue to fill and if it doesn't fill properly you could end up with a crooked tube .
JimGo
Member
Doug,
Won't that be taken care of by the barrel trimmer, and the fact that you've (hopefully) cut the blanks a little bigger than they need to be? I mean, a .012" difference down the length of a brass tube won't result in THAT severe of an angle that the barrel trimmer won't take care of it, will it?
Won't that be taken care of by the barrel trimmer, and the fact that you've (hopefully) cut the blanks a little bigger than they need to be? I mean, a .012" difference down the length of a brass tube won't result in THAT severe of an angle that the barrel trimmer won't take care of it, will it?
dougle40
Member
Most likely it will unless you're working with a piece of wood that is on the small O/D size to begin with and the hole doesn't wander on you .
It also requires more glue inside to fill up the 0.06 gap all around the tube . After having been a machinest for years , I try to make the drilled hole as close as possible to the tube size in an effort to eliminate the possibility of insufficiant glue in the hole .
Just one more of my little quirks I guess !![:I]
jwoodwright
Member
Not to add fuel...
O bit = .3160
21/64 = .3281
That's .0121 difference...
O bit = .3160
21/64 = .3281
That's .0121 difference...
JimGo
Member
Thanks Doug!
dougle40
Member
I don't think we'll quibble over 1/1000 of a thousanths (0.0001).[
)][][][] LOL
its_virgil
Member
If you have a TSC store (Tractor Supply Co) they have set of drill bits with the fractional, wire, and letter sizes. The set is currently on clearance from their Christmas gift tools. I got a set for $39 I think. They seem to be nice bits and come in a metal tool box with a slot for each kit...I think Southerlands has the same bits, but not on clearance. May want to check it out.
do a good turn daily!
Don
do a good turn daily!
Don
Dang, Don..can you believe that Washington DC doesn't have a TSC? []
]JimGo
Member
Actually Lou, there's one in Leesburg, right across Route 15 from the outlets.
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