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Old 3rd January 2012, 04:28 AM   #11
Lavcat is offline Lavcat  United States
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Quote:
Originally Posted by tvrgeek View Post
Current best practice is a ruby ball tip on the multi-axis measuring arm built into the multi-million dollar cnc.
In searching around I see Haimer makes a mini instrument called the Zero Master:

Haimer GmbH - Zero Master Digital

No ruby ball though! I think at 5.04 inches the Zero Master would still be too long for me to use, but in daylight maybe I will make some measurments. There remains the detail that I can't figure out how or from where to buy the thing even if I wanted to.
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Old 3rd January 2012, 05:03 AM   #12
sippy is offline sippy  United Kingdom
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Originally Posted by max426 View Post
do not tun the spindle on
use the solid shank of the edge finder(or dowel pin)
slide a piece of paper between the part and edge finder
move the paper back and forth while moving the table toward the part
until you feel contact
do the math
diameter of edge finder/2 + paper thickness


jim
just replace the edge finder with a length of bright bar, say 1/4 inch dia - follow above instructions.
in engineering theres always a way round the problem, the hard bit is doing it the simple and easy way - the Mercedes eng i apprenticed with use to tell me this atleast 10 times a day for my first two years, this has never left or failed me. I now have an apprentice, i told him i once rescued a freind by fitting a new cam belt to his diesel engine and timed it in useing the long part of a plastic coat hanger and a 6inch steel rule....... and was about 2 1/2 deg out when checked later with all the correct tools
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Old 3rd January 2012, 05:35 AM   #13
Lavcat is offline Lavcat  United States
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Unless I am mistaken max426 was just using the edge finder as a precisely machined round piece of stock, not as an edge finder per se.
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Old 3rd January 2012, 08:08 AM   #14
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Thanks for that link Jeff. However, I'm now wondering why you need to drill a chassis to tolerances of 0.005"?
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Old 3rd January 2012, 04:16 PM   #15
Lavcat is offline Lavcat  United States
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With the head at the top of the column I have less than five inches from the bottom of the spindle to the vise. There is no room in my setup for even the smallest Haimer. I can continue to run the head up further but I suspect eventually something very bad would happen.
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Old 3rd January 2012, 04:23 PM   #16
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Quote:
Originally Posted by pinkmouse View Post
However, I'm now wondering why you need to drill a chassis to tolerances of 0.005"?
Only if you're building a valve amp.

jeff
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Old 3rd January 2012, 04:55 PM   #17
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I also would have accepted - "Because I can"

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Old 3rd January 2012, 10:12 PM   #18
tvrgeek is offline tvrgeek  United States
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I'll keep just laying things out with a scribe, punching the centers, and using my cheap dill press.
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Old 3rd January 2012, 10:19 PM   #19
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Quote:
Originally Posted by pinkmouse View Post
I also would have accepted - "Because I can"
Actually, 0.005" is easy to achieve (for hole locations) on a manual mill with a DRO.

jeff
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Old 3rd January 2012, 11:53 PM   #20
max426 is offline max426  United States
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Quote:
Originally Posted by Lavcat View Post
Unless I am mistaken max426 was just using the edge finder as a precisely machined round piece of stock, not as an edge finder per se.
thats exactly what I was meant

there are alternatives like this

Fine Centering Scope - Magnifiers & Loupes | MSCDirect.com

or

McMaster-Carr


here is some good info for machining
Practical Machinist - Largest Manufacturing Technology Forum on the Web

how precise are you trying to get? .005 .001


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