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Old 05-12-2011, 09:00 PM
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Default How to use pointed tip edge - center finder?

I have two Starret pointed tip edge/center finders and would like to know the proper use procedure.

Could someone enlighten me. I have a 1/2" edgefinder that works like a dream but I'm stumpted on the pointed tip finders.

P.O.
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Old 05-12-2011, 09:25 PM
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Quote:
Originally Posted by Powerpooche View Post
I have two Starret pointed tip edge/center finders and would like to know the proper use procedure.

Could someone enlighten me. I have a 1/2" edgefinder that works like a dream but I'm stumpted on the pointed tip finders.

P.O.
P.O.

Are you speaking of the pointed end that has the body of it smooth that is spring assembled? Not the finger looking thing.

With the pointed one with the 3/8 or 1/2 inch body. I just used a center punch, most of the time my little pocket pen sized one worked just fine.

Center punch mark your spot to drill. Put your finder point down in the chuck or collet, lower your quill and put the point in the mark, move your table back and forth till the bodies line up on the point and shaft use your fingers to check for alignment and don't run the spindle when you do this.

Make sure to sweep your table with the indicator to make sure your head is on straight in case you have to raise and lower your table or run you quill from all out to very close. This is referring to a Bridgeport type machine.

Like this top one?

Scott
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Old 05-12-2011, 10:18 PM
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You can touch the spinning tip to a center punched mark, or to the intersection of a pair of scribed lines ... but the touch has to be almost nothing. Really handy for scribed lines.
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Old 05-13-2011, 12:22 AM
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I've never found an "official" set of instructions for them but, used to try and use them while spinning. Trouble was, that action, unthreaded the stud for retaining the internal spring. I'd lift the quill and a pile of parts fell on the work. I could keep that from happening by putting a drop of oil in the center punch mark. Then, I finally wised up and did it with the machine off.

My reasoning for doing it under power, was the procedure used for the ball & socket type center finder, where you peck at the mark. That's a whole different animal, though. I used one of those types that belonged to a fellow machinist. It was a Starrett and had a springy "give" to it. I liked it a lot and bought myself one. Unfortunately, Starrett had since, changed the design and the "springy give" was gone. Mine doesn't work nearly, as well as the old one and it spends all it's time in the drawer.


Dave
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Old 05-13-2011, 04:25 AM
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This is an excellent basics video series from MIT.
http://techtv.mit.edu/videos/142-machine-shop-1

I think its this video that covers centerfinders. The whole series is worth watching for new and old hands alike.
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Old 05-13-2011, 05:18 AM
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As to picking up lines and points, I do just fine with a GOOD wiggler.
http://www.starrett.com/pages/1512_t...dge_finder.cfm
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Last edited by GWIZ; 05-13-2011 at 05:33 AM.
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Old 05-13-2011, 07:58 PM
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Thank for the links and comments. I'll have to play with one tomorrow to see how the operate.

P.O.
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Old 05-14-2011, 01:03 AM
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Quote:
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As to picking up lines and points, I do just fine with a GOOD wiggler.
http://www.starrett.com/pages/1512_t...dge_finder.cfm

WIGGLER! That's the name I was looking for. GWIZ, does your's have that springy "give" to it? I found that makes all the difference.


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Old 05-14-2011, 03:49 AM
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Quote:
Originally Posted by Dave Lee View Post
WIGGLER! That's the name I was looking for. GWIZ, does your's have that springy "give" to it? I found that makes all the difference.


Dave
I would not say a springy "give" but the fine threads allow for a snug hold.
most of the others the points are ground like crap, they are not tapered enough and are off center. the bad grind does not allow your eyes to view the needle as one straight line to the point.

http://www.shopfloortalk.com/forums/...9&postcount=25
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Old 05-14-2011, 05:59 AM
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The center finder part of the MIT video starts at 26:00.
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