On Sat, 14 Jun 2008 18:20:14 +0100, Norman Billingham wrote:
> Anyone know where I can buy a 9mm (not 3/8") Forstner or sawtooth bit in
> the UK?
Alright, I'll bite... why? Why does 0.525mm make such a difference
(3/8")? Why not use a 9mm centrepoint drill?
I expect you have got good reasons, I'm just curious as to what they
might be...
As an aside, for the hole you need to drill could you plunge a router
instead of using a Forstner? I know I've done that when I needed an odd
sized hole.
"wheelzuk" <[email protected]> wrote in message
news:[email protected]...
"Norman Billingham" <norman.at.tumulus.org.uk> wrote in message
news:[email protected]...
> Anyone know where I can buy a 9mm (not 3/8") Forstner or sawtooth bit in
> the
> UK?
>
>
I'm a little surprised in the fact +0.52mm isn't accurate enough for you.
However, I wondered if you'd considered a 9mm spade bit for your task?
They're more readily available, all indicators on Screwfix and Axminster led
to a 3/8ths size bit, for the forstner bit. Rutlands who I consider at the
top end of the British market also only do either a 3/8ths or 8 and 10mm
forstner bit.
I feel you may have to compromise, or, have your own bit milled to exact
specifications?
Just curiosity mixed with perfectionism. I have some 9mm rare earth magnets
I'm using to make door catches. They fit perfectly snugly into a 9mm hole
and are loose in a 3/8" one. A 9mm brad point drill does the job nicely but
is too long to give clearance under the drill press for the edge-on wood.
There are (were) many ways out of the problem, and I did the job with a 9mm
brad point drill on a horizonal borer.
I could have shaved a bit off a 3/8" Forstner and there are other ways of
doing the job but I was surprised to find its so easy to get 3/8" and so
hard to find 9 mm in these metric days - hence the query.
Spade bits are for DIY and rough work not fine cabinet making - unless you
are prepared to do a fair bit of work on them.
Norman Billingham wrote:
> "wheelzuk" <[email protected]> wrote in message
> news:[email protected]...
> "Norman Billingham" <norman.at.tumulus.org.uk> wrote in message
> news:[email protected]...
>> Anyone know where I can buy a 9mm (not 3/8") Forstner or sawtooth
>> bit in the
>> UK?
>>
>>
>
> I'm a little surprised in the fact +0.52mm isn't accurate enough for
> you.
>
> However, I wondered if you'd considered a 9mm spade bit for your
> task?
> They're more readily available, all indicators on Screwfix and
> Axminster led to a 3/8ths size bit, for the forstner bit. Rutlands
> who I consider at the top end of the British market also only do
> either a 3/8ths or 8 and 10mm forstner bit.
>
> I feel you may have to compromise, or, have your own bit milled to
> exact specifications?
>
>
> Just curiosity mixed with perfectionism. I have some 9mm rare earth
> magnets I'm using to make door catches. They fit perfectly snugly
> into a 9mm hole and are loose in a 3/8" one. A 9mm brad point drill
> does the job nicely but is too long to give clearance under the
> drill
> press for the edge-on wood.
Uh, why not just cut off a brad-point bit to the length you need? 30
seconds with a Dremel and you're done.
FWIW, googling "metric forstner bit" showed many sources for 10mm and
larger, and one set with 6mm, but no 9mm--the set jumps from 6 to 10.
> There are (were) many ways out of the problem, and I did the job
> with
> a 9mm brad point drill on a horizonal borer.
>
> I could have shaved a bit off a 3/8" Forstner and there are other
> ways of doing the job but I was surprised to find its so easy to get
> 3/8" and so hard to find 9 mm in these metric days - hence the
> query.
>
> Spade bits are for DIY and rough work not fine cabinet making -
> unless you are prepared to do a fair bit of work on them.
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
"J. Clarke" <[email protected]> wrote in message
news:[email protected]...
> Norman Billingham wrote:
>> "wheelzuk" <[email protected]> wrote in message
>> news:[email protected]...
>> "Norman Billingham" <norman.at.tumulus.org.uk> wrote in message
>> news:[email protected]...
>>> Anyone know where I can buy a 9mm (not 3/8") Forstner or sawtooth
>>> bit in the
>>> UK?
>>>
>>>
>>
>> I'm a little surprised in the fact +0.52mm isn't accurate enough for
>> you.
>>
>> However, I wondered if you'd considered a 9mm spade bit for your
>> task?
>> They're more readily available, all indicators on Screwfix and
>> Axminster led to a 3/8ths size bit, for the forstner bit. Rutlands
>> who I consider at the top end of the British market also only do
>> either a 3/8ths or 8 and 10mm forstner bit.
>>
>> I feel you may have to compromise, or, have your own bit milled to
>> exact specifications?
>>
>>
>> Just curiosity mixed with perfectionism. I have some 9mm rare earth
>> magnets I'm using to make door catches. They fit perfectly snugly
>> into a 9mm hole and are loose in a 3/8" one. A 9mm brad point drill
>> does the job nicely but is too long to give clearance under the
>> drill
>> press for the edge-on wood.
>
> Uh, why not just cut off a brad-point bit to the length you need? 30
> seconds with a Dremel and you're done.
Mainly becasue if I'd done that with the only 9mm brad point I had to hand I
would have ended up trying to grip the flutes in the chuck!
> FWIW, googling "metric forstner bit" showed many sources for 10mm and
> larger, and one set with 6mm, but no 9mm--the set jumps from 6 to 10.
Yes - that's what I found. Just wondered if anyone knew better.
Anyway, problem solved now
Thanks to all for comments
"Norman Billingham" <norman.at.tumulus.org.uk> wrote in message =
news:[email protected]...
> Anyone know where I can buy a 9mm (not 3/8") Forstner or sawtooth bit =
in the=20
> UK?=20
>=20
>
I'm a little surprised in the fact +0.52mm isn't accurate enough for =
you.=20
However, I wondered if you'd considered a 9mm spade bit for your task? =
They're more readily available, all indicators on Screwfix and Axminster =
led to a 3/8ths size bit, for the forstner bit. Rutlands who I consider =
at the top end of the British market also only do either a 3/8ths or 8 =
and 10mm forstner bit.
I feel you may have to compromise, or, have your own bit milled to exact =
specifications?
Regards
John
wheelzuk