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, "[email protected]" <[email protected]> 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
> > 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/GeneralMortiser/MChiselBitSettingTrick.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
[email protected] 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/GeneralMortiser/MChiselBitSettingTrick.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
On 31 Dec 2006 16:40:44 -0800, "John Martin" <[email protected]>
wrote:
>On Dec 31, 6:25 pm, "[email protected]" <[email protected]> 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
[email protected] <[email protected]> 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!
--
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"charlie b" <[email protected]> wrote in message
>
> Here's The Forty Cent Method for bit to chisel gap.
> http://web.hypersurf.com/~charlie2/GeneralMortiser/MChiselBitSettingTrick.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.
"Michael Faurot" . wrote in message news:[email protected]...
>
> 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.aspx?c=2&p=41702&cat=1,180,42334
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