>
>How do drill a hole with a forstner bit deeper than the lenght of your
>drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
>in the drill. The forstner bit itself is half an inch. I need to drill
>4" deep. Simple question which most probaly has a simple answer but I
>can't find it>
>
>TR
>
You might take a look at the bits made by Convalco, Connecticut Valley
Manufacturing. They are the original maker, and have been doing so since the
1800s. They are longer than most other Forstners. Expensive, though.
John Martin
> How do drill a hole with a forstner bit deeper than the lenght of your
> drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
> in the drill. The forstner bit itself is half an inch. I need to drill
> 4" deep. Simple question which most probaly has a simple answer but I
> can't find it.
Ahh... something I'm able to answer with some certainty!!!
See http://www.techniksusa.com/metal/stshext.htm for extension units.
You'll need the right size collet to go into these units and it will hold
the shank of your current tooling...
Regards,
Joe Agro, Jr.
http://www.autodrill.com
http://www.multi-spindle-heads.com
V8013
My eBay: http://tinyurl.com/3n8gj
One more thing... I'd choose the largest one you can find that your machine
will hold... That way you can get the right size collet for very small or
very large tooling based on the nmaximum tool shank size of the extension
you get... It won't be limited to the one hole you are doing now. All you
would have to do to use it with a different bit is to get a different sized
collet.
ER collets are the absolute best you can find IMHO. I wish they were found
in woodworking circles more often... I can't tell you how many times an ER
collet would have saved me from the all-to-common "My collet is stuck in the
tool. How do I get it out?" question... ER collet nuts pull the collet
out.
Regards,
Joe Agro, Jr.
http://www.autodrill.com
http://www.multi-spindle-heads.com
V8013
My eBay: http://tinyurl.com/3n8gj
On Fri, 04 Feb 2005 05:01:37 GMT, "Lew Hodgett"
<[email protected]> wrote:
>TrailRat writes:
>> How do drill a hole with a forstner bit deeper than the lenght of your
>> drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
>> in the drill. The forstner bit itself is half an inch. I need to drill
>> 4" deep. Simple question which most probaly has a simple answer but I
>> can't find it
>
>You can use an extension for the Forstner bit, but if you truly need an
>inline, straight hole, you use a ship's auger and a brace.
>
>HTH
>
>Lew
>
>=================
Like others have said...using an extentsion and clearing the bit every
so often will work
BUT using a drill press you can drill from both sides very easily ....
I would just clamp a sacrificial board on the table of my drill
press..drill a hold with the bit you are going to drill the work piece
with...into that sacrificial boad... then start drilling the workpiece
to about 1/2 way thru....insert a 1/2 inch dowel in this hole...flip
the workpiece over and insert the dowel into the hole on your
sacrificial board then drill from the reverse side of the
workpiece...everything is perfectly lined up and held in place by the
dowel ...
I do this so much that I actually have a wooden table on my drill
press with Inserts that are replacable..
Bob Griffiths
.
This is far out............but worth a try. Check out wood craft or similiar
store, and look for DIY grinder conversion kits for motors. Hopefully your
bits are 1/2" shaft. These adaptors are 1/2" female smooth bore x 1/2"
threaded rod and are about 4" long. Put the forstner bit in the smooth bore
female, the threaded end in your drill and hope for the best. Good luck.
Lyndell
"TrailRat" <[email protected]> wrote in message
news:[email protected]...
> How do drill a hole with a forstner bit deeper than the lenght of your
> drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
> in the drill. The forstner bit itself is half an inch. I need to drill
> 4" deep. Simple question which most probaly has a simple answer but I
> can't find it>
>
> TR
>
TrailRat writes:
> How do drill a hole with a forstner bit deeper than the lenght of your
> drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
> in the drill. The forstner bit itself is half an inch. I need to drill
> 4" deep. Simple question which most probaly has a simple answer but I
> can't find it
You can use an extension for the Forstner bit, but if you truly need an
inline, straight hole, you use a ship's auger and a brace.
HTH
Lew
On 3 Feb 2005 18:00:21 -0800, "TrailRat" <[email protected]>
wrote:
>How do drill a hole with a forstner bit deeper than the lenght of your
>drill bit?
Two ways; one is to use an extension that clamps onto the shaft of
your Forstner. If you have the sort with a double-ended coupler, you
can use any old piece of rod, any length you like.
The other way is to not use a Forstner. A Forstner is a somewhat
specialised bit for drilling accurate cross-grain holes. As trees
just don't come all that wide, it's really not that common to need to
go deep with a Forstner. So if what you're asking here is "How to I
make a big deep hole?" then you might be better starting with a long
twisted auger anyway.
On 3 Feb 2005 18:00:21 -0800, the inscrutable "TrailRat"
<[email protected]> spake:
>How do drill a hole with a forstner bit deeper than the lenght of your
>drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
>in the drill. The forstner bit itself is half an inch. I need to drill
>4" deep. Simple question which most probaly has a simple answer but I
>can't find it>
Try something like this drill extension:
www.shop.store.yahoo.com/toolsplus/irw88702.html
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TrailRat wrote:
> How do drill a hole with a forstner bit deeper than the lenght of your
> drill bit? Bought a forstner bit with a 2" shaft and half an inch sits
> in the drill. The forstner bit itself is half an inch. I need to drill
> 4" deep. Simple question which most probaly has a simple answer but I
> can't find it>
>
> TR
>
I picked up an extension at a show some time ago. Can't remember the
brand I got buy here is something similar:
http://www.woodcraft.com/family.aspx?DeptID=2143&FamilyID=778
DAGS on "forster bit extension"
mahalo,
jo4hn