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
Ahh... something I'm able to answer with some certainty!!!
See
Regards, Joe Agro, Jr.
Oh... And you may need to "peck" the bit in and out of the wood to clear the chips as you go...
Drilling I do... :)
Regards, Joe Agro, Jr.
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
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.
I picked up an extension at a show some time ago. Can't remember the brand I got buy here is something similar:
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 .
On 3 Feb 2005 18:00:21 -0800, the inscrutable "TrailRat" spake:
Try something like this drill extension:
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.
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
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