Sounds like a lot to me. Remember that will be greatly magnified at the
teeth on the blade. Forrest claims .001" on their blades.. For that
benefit to happen on your saw the arbor run out would have to be less than
.001". Mine is close to .0005.
thats what i thought but as i said im not sure i am doing this right.
i picked up a cheep dial indicater and a magnetic base from HF. probly
my first mistake! i set it up to touch the threads of the arbor and
added some presure to it to get an acurate starting point then hand
turned the blade. maybe i should remove the blade and hand turn the
arbor using the belts or pulleys? this would put the indicater closer
to the bearings so im guessing that would be more accurate. i get a
very slight wobble from the blade on shutdown but its a cheep thin
curf piranna so im sure that is part of the problem. if i drill a 5/8
hole in a piece of 1/2 inch plexiglass or lexan would that give me a
better picture? [no i would not be running the saw like that of
coarse] thanks... skeez
Tirst step is to get the indicator tip OFF the threads entirely...check
right next to the arbor flange, where there should be a straight 5/8"
diameter. Also, be sure to check the face of the flange, too. In some ways,
that is more important the the arbor concentricity because if thearbor is
out by .003" at the arbor, it's also .003" out at the working part of the
blade. But if the flange is .001" out near the arbor, the blade will be out
by closer to .010" at the rim of the blade.
You want to check the flange near the outer rim. Runout should be .001" -
.002". Turn the arbor by hand. If there is any roughness or play, replace
the bearings. That also could give poor runout on the arbor.
On Mon, 02 Feb 2004 18:39:26 GMT, "Preston Andreas"
did that and came up with .004 - .006. best i can tell!!! i dont see
so good these days. lol... i replaced the bearings already so im
wondering if the arbor may be bent or the flange not flat. but as i
say im not too sure about this procedure. this is a very old saw and
has seen some hard use but seems to cut well with a frued glue line
rip blade. maybe i sould not be fiddling with it. sometimes things
should be left alone. curiosity got me though. skeez
here's how i did mine..
screw board to miter guage; screw dial indicator to board with rod
extending out into path of blade.
oh.. cut off the board if it's extends into the blade; get tight fit
of miter guage in miter slot
slide "assembly" into blade; raise/lower blade until the dial
indicator rests on the outside of the blade, but not the teeth, just
where the metal of the blade seems to be smooth.
rotate the blade a full 360.. read min/max on the dial. your arbor
runout will be much less than the actual blade runout. my blade
runout is .002; so I have to believe my arbor runout is .001 or less.
getting down to the arbor itself will probably be a pain. if
possible, try to find a blade or vibration damper that you know has
very low runout
clean dust and gunk off the arbor and blade
On Mon, 02 Feb 2004 18:49:48 GMT, " firstname.lastname@example.org"
some places where the dial indicator will yield interesting/useful
1) the flange. what you are measuring is how square the flange is
to the axis of the arbor. the plunger of the indicator should be
parallel to the arbor with the tip riding near the outside rim of the
flange. measurement is indicated variation in one revolution.
2) the blade. what you are measuring is the total runout of the
blade and flange. if both have runout the reading you get will change
if you loosen the arbor nut and rotate the blade without rotating the
arbor. the plunger of the indicator should be parallel to the arbor
and the tip should be near the rim of the blade. be careful not to
allow the tip of the indicator to fall into the gullets or anti
vibration slots of the blade. measurement is indicated variation in
3) the miter slots. what you are measuring is the squareness of
the miter slots to the arbor. mount the indicator to a tight fitting
bar in the miter slot with the plunger parallel to the arbor and the
tip reading the rim of the saw. choose a clean spot on the blade and
draw a circle of 1/2" or so on it with a sharpie. raise the blade to
full height and rotate it so that circle is at the front of the saw.
take a reading inside the circle. rotate the circle on the blade to
the rear and slide the indicator to follow it. take a reading here.
measurement is the difference between the readings.
ok im understanding this better now. .003 - .004 on the flange. i did
this by mounting the magnetic base to the inside of the cabinet so
should be accurate.
yep see above.
the freud glue line rip blade has so many slots cut in it that it is
hard to get a reading i feel is acurate. i have some lexan in 1/2"
size so i may try making a plate to check further out from the flange.
the flange was rough too so i cleaned it up with an old course stone.
that got me to the .003 -.004 reading. this is more than most are
getting but it may just have to be as good as it gets. this saw was
made in 1948 and has been used in a cabinet shop environmentso......
i believe im real close to square with the blade but ill check further
when i get the chance. thank you for the info. the saw cuts great.
what caused concern was the slight wobble during shut down. the new
glue line rip blade cut down on that somewhat. the new beismeyer fence
improved this saw a LOT. know anybody that wants the original fence?
On Tue, 03 Feb 2004 18:51:09 GMT, " email@example.com"
when it's all said and done this is the where cut quality happens. if
the flange is out of true a perfect blade will blow chipsout of your
workpiece, and if the blade has runout a perfect flange won't correct
it. however, it is possible to oppose equal amounts of runout between
the blade and flange to cancel them out. it's kind of fiddly, and a
kludge fix, but doable.
as far as indicating the rim of the blade, there is no need for the
blade to be rotating while you are taking the reading. choose a spot a
little inside the gullets. mark a tooth with the sharpie so you will
know when you've gone all of the way around and take a reading. with
one hand retract the plunger of the indicator while with the other
hand advancing the blade past the slot. let the plunger back to the
blade, take the next reading, repeat. just make sure you don't move
your indicator holder setup.
the lexan is unlikely to be accurate enough to give you meaningful
a machinist can true your arbor, but you'll have to dismantle the saw
to do so. if you do go this route, take the opportunity to replace the
bearings. if the rest of the saw is in good shape it might be well
Bridger has a good point, the dial indicator should be as nearly parallel to
the table as possible when checkin the arbor runout. You might also check
the outer rim of the blade, but be wary of any dust between the blade and
arbor/nut and remember, the runout on the blade may accentuate or dampen the
runout reading overall depending on how the arbor and blade line up to each
other. You can take a reading on the blade, rotate it A 1/4 against the
arbor and get a wholly different read out.
I talked to a Delta tech sometime back. He said they were using a different
method to weld the flange to the arbor than they used when my arbor was
manufactured. He said the runout in general was less than with the older
arbors and you should now expect 0.002" or less runout on the arbor flange.
You might call Delta and check that out.
On Tue, 03 Feb 2004 18:44:58 GMT, "Preston Andreas"
my arbor flange screws on with fine threads. no welding on this one. i
was trying to figure a way to maybe flaten it. but i havent figured a
way to do it acuratly enough while still mounted to the saw,. if i
could do that theory say it could be gotten perfectly flat no matter
how out of round the arbor may be. hmmm.... something to think about?
Someone else here probably has experience doing this, but wouldn't there be
a way to flatten the arbor flange while it's spinning? I suppose there's
all kinds of safety precautions here, but you've already got it spinning,
almost as if it were on a lathe. Well, faster than a lathe. And if there's
not much material to remove, you might even be able to use some abrasive
paper backed by a flat flat board.
I would think no matter what you do, you'd reduce the runout. You'd have to
be careful to not make it slightly dished, or cone-shaped, which might bend
the blade when the nut is tight.
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