The Delta Mortiser instruction manual says the clearance between the
chisel and bit should be between 1/16" and 3/16" --- depending on the
type of wood. In the past, with a drillpress mortising attachment, I've
always set the clearance at about 1/16". From your experience, which
species of wood require the larger clearance?

Joel

On Dec 31, 6:25 pm, " wrote:
The Delta Mortiser instruction manual says the clearance between the
chisel and bit should be between 1/16" and 3/16" --- depending on the
type of wood. In the past, with a drillpress mortising attachment, I've
always set the clearance at about 1/16". From your experience, which
species of wood require the larger clearance?

Joel

3/16"? I guess I'd ask Delta. I won't pretend to know more than they
do about mortising chgisels and bits, but it sounds like a misprint to
me. I usually set mine around 1/32" - jst enough to keep the bit from
rubbing.

John Martin

On 31 Dec 2006 16:40:44 -0800, "John Martin"
wrote:
On Dec 31, 6:25 pm, " wrote:
The Delta Mortiser instruction manual says the clearance between the
chisel and bit should be between 1/16" and 3/16" --- depending on the
type of wood. In the past, with a drillpress mortising attachment, I've
always set the clearance at about 1/16". From your experience, which
species of wood require the larger clearance?

Joel

3/16"? I guess I'd ask Delta. I won't pretend to know more than they
do about mortising chgisels and bits, but it sounds like a misprint to
me. I usually set mine around 1/32" - jst enough to keep the bit from
rubbing.

I haven't used it much yet, but with the 1/4" chisel in hard maple I
had to set it to at least 1/8" or else the chips would just jam up the
bit.


-Leuf

wrote:

The Delta Mortiser instruction manual says the clearance between the
chisel and bit should be between 1/16" and 3/16" --- depending on the
type of wood. In the past, with a drillpress mortising attachment, I've
always set the clearance at about 1/16". From your experience, which
species of wood require the larger clearance?

Joel

The bit in hardwood will make fine shavings. In soft wood you
frequently
get the grain to tear rather than be shaved. If you leave a bigger
gap between the chisel and the bit you're apt to have the bit deflect
in the cut - and leave room for chips to jamb between it and the chisel.

Here's The Forty Cent Method for bit to chisel gap.
http://web.hypersurf.com/~charlie2/G...tingTrick.html

And if you tune up the chisel and bit - sharpen and polish - you'll get
less wood tearing and clogging things up.

charlie b

charlie b wrote:
Here's The Forty Cent Method for bit to chisel gap.
http://web.hypersurf.com/~charlie2/G...tingTrick.html


I use the 40 cent method on my mortiser.



--
Mortimer Schnerd, RN
mschnerdatcarolina.rr.com

"charlie b" wrote in message

Here's The Forty Cent Method for bit to chisel gap.
http://web.hypersurf.com/~charlie2/G...tingTrick.html

And if you tune up the chisel and bit - sharpen and polish - you'll get
less wood tearing and clogging things up.

You MUST tune up the chisel and bit. They are NOT sharp from the factory.
Lee Valley sell a tool for doing the inside of the chisel. Hone the sides
on stones as you would any cutting tool. A small file will do the side of
the bit.

The Delta Mortiser instruction manual says the clearance between the chisel and bit should be between 1/16" and 3/16" ...

... If you leave a bigger gap between the chisel and the bit you're apt to have the bit deflect in the cut - and leave room for chips to jamb between it and the chisel. ...

Here's The Forty Cent Method for bit to chisel gap.


http://web.hypersurf.com/~charlie2/G...tingTrick.html

Thanks. I was planning to machine some steel shims to the right
thickness, but the Forty Cent Method sounds a lot cheaper.

And if you tune up the chisel and bit - sharpen and polish - you'll get less wood tearing and clogging things up.

I had a conical stone on a shaft, but it seems to be on a long
vacation. I'll get the Lee Valley set-up -- and file the inside corners
a bit.

Thanks again, Charlie.

Joel

wrote:

I had a conical stone on a shaft, but it seems to be on a long
vacation. I'll get the Lee Valley set-up -- and file the inside corners
a bit.

I saw the original post suggesting the stuff from Lee Valley, but when
I tried poking around their web site, I didn't see it myself. Would
you post a URL for this tool?

Thanks!

--

If you want to reply via email, change the obvious words to numbers and
remove ".invalid".

"Michael Faurot" . wrote in message ...


I saw the original post suggesting the stuff from Lee Valley, but when
I tried poking around their web site, I didn't see it myself. Would
you post a URL for this tool?

Thanks!

http://www.leevalley.com/wood/page.a...at=1,180,42334

Last item on the page.