On Sun, 25 Jan 2004 6:33:14 -0700, mel wrote
(in message <[email protected]>):
> I bought a dial indicator and base in my never ending quest for precision.
> How high above the body of the cutterhead should the edge of the knife be?
>
>
You should strive to give the blades the most support possible. I'd sink the
blades as deep into the cutterhead as possible while still allowing for chip
removal and proper outfeed table adjustment.
Using a dial indicator on a pointy rotating object is a lesson in futility.
You can never really know where top dead center is. A straight edge and
feeler gauge or some other method to index the cutter head was a lot easier
for me.
-Bruce
On Sun, 25 Jan 2004 13:26:28 -0700, Doug Miller wrote
(in message <[email protected]>):
> In article <[email protected]>, Bruce
> <[email protected]> wrote:
>
>> Using a dial indicator on a pointy rotating object is a lesson in
>> futility.
>> You can never really know where top dead center is.
>
> Of course you can. Use the dial indicator to find top dead center on the
> cutterhead. Then scribe a line on the fence, aligned with that position. The
> cutting edge is at TDC when it aligns with the mark on the fence.
As pointed out by another poster you really need a flat head (versus the ball
head) to make life easier. On my Jet 6", I use a 6" rule as a "stop" that I
align the flat surface of the blade against (blade flat that protrudes from
the cutter head for the rabbeter rests flush on the end of the rule. The long
side of the rule rests flat on the infeed table lowered way down). This gives
me very consistent cutterhead indexing. With the cutter head locked down
thusly, I use a machine parallel and a feeler gauge to get the blade height
even across the outfeed table. I then repeat the setup for the other two
blades. No need to find TDC with this method. I then raise/lower the outfeed
table until the blade just "ticks" against the parallel while I rotate the
cutter head by hand (unplugged of course! I also remove the belt). I figure
this gives me 0.002-0.004" of blade above the table. If I make the blade
lower (flush) or higher I get convex surfaces to a slight degree. Ideally I
thought the blade had to be dead flush with the outfeed table but I guess
there is a small amount of springback as the cutter chops the wood.
>
> --
> Doug Miller (alphageek at milmac dot com)
>
> How come we choose from just two people to run for president and 50 for Miss
> America?
In article <[email protected]>,
George <[email protected]> wrote:
>You know that one is referencing the cutterhead, the other the outfeed,
>don't you?
>
No, I missed that. 0.012" above the cutterhead doesn't seem right. I've
never seen a jointer knife riding that low in the head.
--
Scott Post [email protected] http://home.insightbb.com/~sepost/
In article <[email protected]>,
Preston Andreas <[email protected]> wrote:
>I have the Delta 8" jointer (DJ-20). The knives should be .012" above the
>cutterhead body. The figure is in the manual. I suggest you consult your
>manual or contact the manufacturer for the correct amount.
>
Or, better yet, experiment. I had one jointer that liked the blades to
be 0.003" high. The other liked them 0.006" high. Not sure what caused
the difference.
Joint a couple boards. If they don't touch on the ends (convex boards)
lower the outfeed. Keep doing this until the boards are straight and
touch along their entire length. If you lower the outfeed too far
you'll start getting snipe on the trailing edge. You should be able
to get it perfect, where the boards are straight and you get no snipe.
If you can't, it's better to have a little snipe than convex edges - just
cross-cut off the last 1/4" where the snipe occurs.
--
Scott Post [email protected] http://home.insightbb.com/~sepost/
High enough to equal the outfeed table.
Seriously, as long as can see some flat below the bevel in the back, I'm
happy. It's the first statement that's important.
"mel" <[email protected]> wrote in message
news:[email protected]...
> I bought a dial indicator and base in my never ending quest for precision.
> How high above the body of the cutterhead should the edge of the knife be?
>
>
You know that one is referencing the cutterhead, the other the outfeed,
don't you?
"Scott Post" <[email protected]> wrote in message
news:1g6Rb.155966$na.264006@attbi_s04...
> In article <[email protected]>,
> Preston Andreas <[email protected]> wrote:
> >I have the Delta 8" jointer (DJ-20). The knives should be .012" above
the
> >cutterhead body. The figure is in the manual. I suggest you consult
your
> >manual or contact the manufacturer for the correct amount.
> >
>
> Or, better yet, experiment. I had one jointer that liked the blades to
> be 0.003" high. The other liked them 0.006" high. Not sure what caused
> the difference.
>
> Joint a couple boards. If they don't touch on the ends (convex boards)
> lower the outfeed. Keep doing this until the boards are straight and
> touch along their entire length. If you lower the outfeed too far
> you'll start getting snipe on the trailing edge. You should be able
> to get it perfect, where the boards are straight and you get no snipe.
> If you can't, it's better to have a little snipe than convex edges - just
> cross-cut off the last 1/4" where the snipe occurs.
>
> --
> Scott Post [email protected]
http://home.insightbb.com/~sepost/
DJ-20 is that minimum-exposure "parallelogram" mechanism, isn't it?
Don't own one, but no reason to suppose that a revolutionary design wouldn't
incorporate other differences.
"Scott Post" <[email protected]> wrote in message
news:0KhRb.154575$I06.1561532@attbi_s01...
> In article <[email protected]>,
> George <[email protected]> wrote:
> >You know that one is referencing the cutterhead, the other the outfeed,
> >don't you?
> >
>
> No, I missed that. 0.012" above the cutterhead doesn't seem right. I've
> never seen a jointer knife riding that low in the head.
>
> --
> Scott Post [email protected]
http://home.insightbb.com/~sepost/
It is the parallelogram adjustment. I believe that my Jet planer is .015"
above the cutterhead. You don't want much or there is too much of a bending
moment.
Preston
"George" <[email protected]> wrote in message
news:[email protected]...
> DJ-20 is that minimum-exposure "parallelogram" mechanism, isn't it?
>
> Don't own one, but no reason to suppose that a revolutionary design
wouldn't
> incorporate other differences.
>
> "Scott Post" <[email protected]> wrote in message
> news:0KhRb.154575$I06.1561532@attbi_s01...
> > In article <[email protected]>,
> > George <[email protected]> wrote:
> > >You know that one is referencing the cutterhead, the other the outfeed,
> > >don't you?
> > >
> >
> > No, I missed that. 0.012" above the cutterhead doesn't seem right.
I've
> > never seen a jointer knife riding that low in the head.
> >
> > --
> > Scott Post [email protected]
> http://home.insightbb.com/~sepost/
>
>
"Preston Andreas" <[email protected]> wrote in message news:<[email protected]>...
> It is the parallelogram adjustment. I believe that my Jet planer is .015"
> above the cutterhead. You don't want much or there is too much of a bending
> moment.
>
> Preston
> "George" <[email protected]> wrote in message
> news:[email protected]...
> > DJ-20 is that minimum-exposure "parallelogram" mechanism, isn't it?
> >
> > Don't own one, but no reason to suppose that a revolutionary design
> wouldn't
> > incorporate other differences.
> >
> > "Scott Post" <[email protected]> wrote in message
> > news:0KhRb.154575$I06.1561532@attbi_s01...
> > > In article <[email protected]>,
> > > George <[email protected]> wrote:
> > > >You know that one is referencing the cutterhead, the other the outfeed,
> > > >don't you?
> > > >
> > >
> > > No, I missed that. 0.012" above the cutterhead doesn't seem right.
> I've
> > > never seen a jointer knife riding that low in the head.
> > >
> > > --
> > > Scott Post [email protected]
> > http://home.insightbb.com/~sepost/
> >
> >
Folks:
I use a dial indicator to set jointer knives. Because I have a round
ball on the indicator I use one of the knives that I removed which is
pretty flat and lay it on the outfeed table with the majority of it
resting on the outfeed talbe and with just enough of the other end
directly on top of a knife.I then zero the incicator on top of the
knife which is the 0 mark relative to the outfeed table and begin to
rotate the cutter head until it lifts the knife. I can then determine
how high the knive is relative to the outfeed table and make
adjustments from there on in. Tedious I know but effective and
accurate.
In article <[email protected]>,
Bruce <[email protected]> wrote:
>
>Using a dial indicator on a pointy rotating object is a lesson in futility.
>You can never really know where top dead center is.
With the little ends that come with most dial indicators, I agree.
However, the ends are just screwed on and places like MSC and Enco sell
replacements. I bought a relatively large diameter end that works great
for setting jointer knives. Just get the dial indicator more or less over
top dead center and turn the cutter head by hand. The largest reading
will occur at top dead center.
> A straight edge and
>feeler gauge or some other method to index the cutter head was a lot easier
>for me.
>
Even though I have a dial indicator and homemade jig to hold it for setting
knives I find it faster to use a straight edge on the outfeed table. I've
found that when the knife makes a faint "snick" without lifting the
straightedge the knife is about 0.003" above the outfeed table which has
been just about perfect on the last two jointers I've owned. Having the
knives at the same exact height as the outfeed table gives me convex
edges.
--
Scott Post [email protected] http://home.insightbb.com/~sepost/
In article <[email protected]>, Bruce <[email protected]> wrote:
>Using a dial indicator on a pointy rotating object is a lesson in futility.
>You can never really know where top dead center is.
Of course you can. Use the dial indicator to find top dead center on the
cutterhead. Then scribe a line on the fence, aligned with that position. The
cutting edge is at TDC when it aligns with the mark on the fence.
--
Doug Miller (alphageek at milmac dot com)
How come we choose from just two people to run for president and 50 for Miss America?
In article <0KhRb.154575$I06.1561532@attbi_s01>, [email protected] wrote:
>In article <[email protected]>,
>George <[email protected]> wrote:
>>You know that one is referencing the cutterhead, the other the outfeed,
>>don't you?
>>
>
>No, I missed that. 0.012" above the cutterhead doesn't seem right. I've
>never seen a jointer knife riding that low in the head.
>
0.012" above the outfeed table doesn't seem right either...
--
Doug Miller (alphageek at milmac dot com)
How come we choose from just two people to run for president and 50 for Miss America?
> With the little ends that come with most dial indicators, I agree.
> However, the ends are just screwed on and places like MSC and Enco sell
> replacements. I bought a relatively large diameter end that works great
> for setting jointer knives. Just get the dial indicator more or less over
> top dead center and turn the cutter head by hand. The largest reading
> will occur at top dead center.
I looked in the MSC catalog and wasn't sure what to get as a
replacement tip for my dial indicator. Could you give a little more
detail?
Thanks,
Jim
In article <[email protected]>,
Jim Campbell <[email protected]> wrote:
>> With the little ends that come with most dial indicators, I agree.
>> However, the ends are just screwed on and places like MSC and Enco sell
>> replacements. I bought a relatively large diameter end that works great
>> for setting jointer knives. Just get the dial indicator more or less over
>> top dead center and turn the cutter head by hand. The largest reading
>> will occur at top dead center.
>
>I looked in the MSC catalog and wasn't sure what to get as a
>replacement tip for my dial indicator. Could you give a little more
>detail?
>
Here are individual ends:
http://www.use-enco.com/CGI/INPDFF?PMPAGE=185&PARTPG=INLMK32
They also sell a set for $5.25 that gives you a variety of ends:
http://www.use-enco.com/CGI/INPDFF?PMPAGE=186&PARTPG=INLMK32
--
Scott Post [email protected] http://home.insightbb.com/~sepost/
I have the Delta 8" jointer (DJ-20). The knives should be .012" above the
cutterhead body. The figure is in the manual. I suggest you consult your
manual or contact the manufacturer for the correct amount.
Preston
"mel" <[email protected]> wrote in message
news:[email protected]...
> I bought a dial indicator and base in my never ending quest for precision.
> How high above the body of the cutterhead should the edge of the knife be?
>
>