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Old 01-21-2013, 12:38 AM   #1 (permalink)
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Bolt hole spacing on standard ASA/duck bill

Anyone know the spacing between the bolt holes on a standard ASA or duck bill? I did a quick check while at the field today and it appears to be 0.700 inches. I am just wondering if anyone can confirm that measurement.

I have a project in mind for my machining class if I have time in the semester to work on it. I may even try to use it as a substitute for an assigned project.
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Old 01-21-2013, 11:19 AM   #2 (permalink)
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dang it i just cut on in half this am... hahaha

let me dig around....
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Old 01-21-2013, 11:24 AM   #3 (permalink)
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Let me know what you find out. When I measured one at the field yesterday I just eyeballed where the centers might be. Not sure how one would find the center of a hole after it has been drilled.
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Old 01-21-2013, 11:30 AM   #4 (permalink)
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Quote:
Originally Posted by DarkShadowHunter View Post
Let me know what you find out. When I measured one at the field yesterday I just eyeballed where the centers might be. Not sure how one would find the center of a hole after it has been drilled.
Measure end to end, then subtract 1 hole diameter
or
Measure inside to inside, then add 1 hole diameter




.750" center to center

Last edited by super_stanchy; 01-21-2013 at 11:34 AM.
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Old 01-21-2013, 11:33 AM   #5 (permalink)
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I think you'll find that a Standard ASA/Duckbill is 3/4 of an inch center to center.

You were pretty close with eye ninety method,lol.
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Old 01-21-2013, 12:09 PM   #6 (permalink)
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Thank you stanchy. I will remember that trick to find distance between centers of predrilled holes.

Rolling thunder, while 3/4" and .750 are basically the same, they are different to the machinist. A 3/4" measurement has a looser tolerance than a .750" measurement. Oddly enough the decimal measurement is also more accurate than the fractional measurement.
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Old 01-21-2013, 11:21 PM   #7 (permalink)
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Quote:
Originally Posted by super_stanchy View Post
Measure end to end, then subtract 1 hole diameter
or
Measure inside to inside, then add 1 hole diameter




.750" center to center

or measure front edge to front edge and subtract nothing.
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