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Posted by Roger Shoaf on June 7, 2008, 2:42 pm
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On an edge finder there are two ends. The end you use to find the edge is
pretty straight forward, but the pointy end is supposed to be for finding
the center of holes, but for the life of me I cant seem to figure out how
this is supposed to work.
Does any one here know?
--
Roger Shoaf
If you are not part of the solution, you are not dissolved in the solvent.
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Posted by Jim Wilkins on June 7, 2008, 3:38 pm
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> On an edge finder there are two ends. =A0The end you use to find the edge =
is
> pretty straight forward, but the pointy end is supposed to be for finding
> the center of holes, but for the life of me I cant seem to figure out how
> this is supposed to work.
>
> Does any one here know?
>
> --
> Roger Shoaf
> If you are not part of the solution, you are not dissolved in the solvent.=
Clamp it in the chuck and run the point down into the hole, lightly. I
think you're supposed to mike across the sliding joint and adjust
until it reads whatever the shank diameter is, but I just slide my
fingernail over the step and move the table until I can't feel it on
any side.
Once you've located the edges you can put the pointed end down to
confirm that your 0,0 position really is the corner of the work, you
didn't locate on a chip.
A burr or countersink can easily throw off the center finder. I just
had to adjust some holes positions by 0.015" because the burr on a
hole apparently shifted the countersink and I misplaced the vise stop
on the next setup.
Jim Wilkins
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Posted by Karl Townsend on June 7, 2008, 10:24 pm
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...
> pretty straight forward, but the pointy end is supposed to be for finding
> the center of holes, but for the life of me I cant seem to figure out how
> this is supposed to work.
>
> Does any one here know?
I was hoping somebody would give a better answer than mine. Seems you're not
getting an answer.
I've not seen anybody else do this, so there may be a better way. On a very
small hole, the pointed end will tell you which side you hit first as you
lower the quill. Make an adjustment and try again. When you're all the way
down, you're right over the center of the hole.
Karl
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Posted by on June 8, 2008, 7:41 am
Please log in for more thread options On Sat, 7 Jun 2008 21:24:19 -0500, "Karl Townsend"
>
>...
>> pretty straight forward, but the pointy end is supposed to be for finding
>> the center of holes, but for the life of me I cant seem to figure out how
>> this is supposed to work.
>>
>> Does any one here know?
>
>I was hoping somebody would give a better answer than mine. Seems you're not
>getting an answer.
>
>I've not seen anybody else do this, so there may be a better way. On a very
>small hole, the pointed end will tell you which side you hit first as you
>lower the quill. Make an adjustment and try again. When you're all the way
>down, you're right over the center of the hole.
>
>Karl
>
The point of an ordinary scriber fitted in the chuck can be
used to locate an edge, a scribed line or a centre punch dot.
It's pretty rough and ready because the point can be a bit cock
eyed and not accurately represent the true spindle axis.
The pointy bit of the edge finder set is intended to do the
same job but eliminate the spindle axis error.
Set the pointer end roughly on axis and close to a flat
surface. Run at any convenient low speed and with a finger
resting on the surface SLOWLY edge the point in until the point
reaches dead centre and no longer rotates around a small circle.
The point is now dead on the axis of the spindle.
It's pretty easy to learn to do this and it only takes
seconds. It's then a versatile location finder.
This is the way it is supposed to work but the downside is
that it means removing the cutter and replacing it with the edge
finder. A more convenient kludge is the "sticky pin" system.
In ancient UK terminology a gramophone needle is stuck to
the end of the already installed cutter with a lump of
Plasticene. The point of the needle is then centred by finger
pressure. It needs a little more skill to do this because, until
you're used to it, both ends of the needle may initially be way
off centre. However it's a skill well worth aquiring as it's very
much quicker than messing about changing between cutter and edge
finder.
Not sure about the North American equivalant. Gramophone
needles are pretty rare now but the cut off end of a thick sewing
needle does the same job.
Plasticene is a propriety brand of modelling clay which
happens to have sufficient "stickyness" without being "rubbery".
This zero "rubbery" is vital as the point mustn't spring back
once it's centred.
Jim
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Posted by Wes on June 8, 2008, 4:08 am
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>On an edge finder there are two ends. The end you use to find the edge is
>pretty straight forward, but the pointy end is supposed to be for finding
>the center of holes, but for the life of me I cant seem to figure out how
>this is supposed to work.
I use the finger nail method. Tapped holes are going to be a problem though.
Turning a tight pin to stick in tapped hole and indicating that might be more
accurate.
Usually when you are tring to pick up such a hole, there is something broken in
it though
:(
Wes
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