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Posted by Dave August on July 23, 2008, 12:02 am
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I go in with it wobbeling,
watch it center up
zero the DRO,
crank a bit more and watch it "jump" (I don't call it kick) sideways,
recheck the DRO and if it *ISN'T* plus .0005 or .001, I do it again...
FWIW an old timer told me to take it to the "jump" and call it zero (like
you do).... go figure
I also find it works best at about 1000 rpm... "jumps" real fast then
--.- Dave
> There's been a role reversal at my place...
>
> Whenever "The Kid" is home, I watch him machine to learn. he edge found a
> part (in 15 seconds!) by flicking the edgefinder to make it wobble and
> then turning the crank till it was on center.
>
> I've always cranked till the finder "kicks" to one side. I don't have his
> accurate eye sight and feel to do it that way. My results weren't as
> repeatable ( I tried after he left) so I'm back to the "kick"
>
> Karl
>
>
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Posted by limeylew@gmail.com on July 23, 2008, 7:58 am
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wrote:
> There's been a role reversal at my place...
>
> Whenever "The Kid" is home, I watch him machine to learn. he edge found a
> part (in 15 seconds!) by flicking the edgefinder to make it wobble and th=
en
> turning the crank till it was on center.
>
> I've always cranked till the finder "kicks" to one side. =A0I don't have =
his
> accurate eye sight and feel to do it that way. My results weren't as
> repeatable ( I tried after he left) so I'm back to the "kick"
>
> Karl
I do it your way, Karl. That's what they taught me back in the 50's,
when I was an apprentice and I don't see any reason to change, as it
has always produced satisfactory results for me.
Lewis.
*****
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Posted by on July 23, 2008, 8:50 am
Please log in for more thread options > wrote:
>
> > There's been a role reversal at my place...
>
> > Whenever "The Kid" is home, I watch him machine to learn. he edge found a
> > part (in 15 seconds!) by flicking the edgefinder to make it wobble and then
> > turning the crank till it was on center.
>
> > I've always cranked till the finder "kicks" to one side. I don't have his
> > accurate eye sight and feel to do it that way. My results weren't as
> > repeatable ( I tried after he left) so I'm back to the "kick"
>
> > Karl
>
> I do it your way, Karl. That's what they taught me back in the 50's,
> when I was an apprentice and I don't see any reason to change, as it
> has always produced satisfactory results for me.
>
> Lewis.
>
> *****
I got shown another method at school on Tuesday - chuck up a dowel
pin, say 10mm, and coat it with marking pen - bring work to spinning
pin until you just see a faint line appear on the down as the job
wipes it off. Then add 5mm (ie, 1/2 the pin diameter) and you will
have your edge...then add 1/2 job diameter if you want the centre -
zero your DRO - this was part of the setup for an indexing exercise..
Andrew VK3BFA.
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Posted by Don Foreman on July 23, 2008, 10:41 am
Please log in for more thread options On Tue, 22 Jul 2008 20:24:43 -0500, "Karl Townsend"
>There's been a role reversal at my place...
>
>Whenever "The Kid" is home, I watch him machine to learn. he edge found a
>part (in 15 seconds!) by flicking the edgefinder to make it wobble and then
>turning the crank till it was on center.
>
>I've always cranked till the finder "kicks" to one side. I don't have his
>accurate eye sight and feel to do it that way. My results weren't as
>repeatable ( I tried after he left) so I'm back to the "kick"
>
>Karl
>
I go for the kick. Watching the wobble require that one can see .001"
or less of wobble, while the kick is considerably less subtle. The
kick seems to be accurate and repeatable to .0005 or so, close enough
for me. I usually check it once or twice to see that I get the same
readings.
A good centerfinder (Brown & Sharpe) works considerably better than a
Chinese knockoff for just a few bux more.
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Posted by Errol Groff on July 23, 2008, 11:46 am
Please log in for more thread options On Tue, 22 Jul 2008 20:24:43 -0500, "Karl Townsend"
>There's been a role reversal at my place...
>
>Whenever "The Kid" is home, I watch him machine to learn. he edge found a
>part (in 15 seconds!) by flicking the edgefinder to make it wobble and then
>turning the crank till it was on center.
>
>I've always cranked till the finder "kicks" to one side. I don't have his
>accurate eye sight and feel to do it that way. My results weren't as
>repeatable ( I tried after he left) so I'm back to the "kick"
>
>Karl
>
Last year at EASTEC I picked up a Hermann Schmidt edge finder. Very
accurate and excelent repetition. Worth the extra $$$ for quailty!
You can rest assured that I do NOT let my students borrow it!!!
http://www.hermannschmidt.com/
Errol Groff
Instructor, Machine Tool Department
H.H. Ellis Technical High School
Danielson, CT
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>
> Whenever "The Kid" is home, I watch him machine to learn. he edge found a
> part (in 15 seconds!) by flicking the edgefinder to make it wobble and
> then turning the crank till it was on center.
>
> I've always cranked till the finder "kicks" to one side. I don't have his
> accurate eye sight and feel to do it that way. My results weren't as
> repeatable ( I tried after he left) so I'm back to the "kick"
>
> Karl
>
>