0.0001" vs. 0.0005" - 460 Ford Forum
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post #1 of 11 (permalink) Old 11-27-2010, 12:24 AM Thread Starter
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0.0001" vs. 0.0005"

Measurement graduation, what are you guys going with? My particular question regards dial bore gauges, for the measurement of main bearing bores, cyl. bores, etc...

If your bore gauge is in a 0.0005" graduation, should your mic. be in the same graduation for most accurate readings?

Thanks,

Derek.

1966 Mercury M-100
1976 Ford F250 4x4

Last edited by DJW-Racing; 11-27-2010 at 12:26 AM.
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post #2 of 11 (permalink) Old 11-27-2010, 10:21 AM
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Hi,
Better micrometers have .0001" graduations.Something like mitutoyo or starrett.

That's what I would use.

Dial bore gauges can be .0001" graduation also.

Hope this helps.

One thing is to make sure everything is the same temperature when you go to check it

Tom Leslie

Last edited by Dragsterman; 11-27-2010 at 10:24 AM. Reason: added things
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post #3 of 11 (permalink) Old 11-27-2010, 05:15 PM Thread Starter
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Having a hard time finding a digital or mechanical micrometer with a 0.0001" resolution.

I want to use this dial bore gauge:

http://www1.mscdirect.com/CGI/NNSRIT...90076&PMT4NO=0

Would like to spend $250 or LESS.

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post #4 of 11 (permalink) Old 11-27-2010, 05:25 PM
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Check out Enco tools. http://www.use-enco.com/CGI/INPDFF?P...MITEM=326-1159

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post #5 of 11 (permalink) Old 11-27-2010, 06:32 PM Thread Starter
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Thanks for the link!

Why is everything either 2-3" or 3-4"?

Something with a range of 2-4" or 2.5-3.5" would be nice, because with 3" main bearing journals, your either maxed out with a 2-3" or barely small enough with a 3-4" mic.

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post #6 of 11 (permalink) Old 11-27-2010, 07:10 PM
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For engine building you should use mic's and bore gages that read in .0001". Watch Ebay, you can find better deals on new or used ones there.
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post #7 of 11 (permalink) Old 11-27-2010, 10:58 PM
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Quote:
Originally Posted by DJW-Racing View Post
Thanks for the link!

Why is everything either 2-3" or 3-4"?

Something with a range of 2-4" or 2.5-3.5" would be nice, because with 3" main bearing journals, your either maxed out with a 2-3" or barely small enough with a 3-4" mic.
Well, the spindle is the same on each size. The frame is bigger for each graduation. Ease for the manufacturer and cheaper for us. I have a set for 1-3 and an individual one, 4 to 5 mic, for pistons. I don't mess with digital ones though. Too expensive for me.
By the way, I bought the 4-5 mic from ENCO. The thing got here FAST! Only thing I have bought from them though. Still, I wouldn't be afraid to order again.

1972 torino 460 c-6
1988 turbo coupe, 1978 f150 460/c6

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post #8 of 11 (permalink) Old 11-27-2010, 11:40 PM Thread Starter
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Originally Posted by fordman59 View Post
Well, the spindle is the same on each size. The frame is bigger for each graduation. Ease for the manufacturer and cheaper for us. I have a set for 1-3 and an individual one, 4 to 5 mic, for pistons. I don't mess with digital ones though. Too expensive for me.
By the way, I bought the 4-5 mic from ENCO. The thing got here FAST! Only thing I have bought from them though. Still, I wouldn't be afraid to order again.
Alright, I guess I will have to go with a 2-3" mic. for my 3" mains. Hopefully it fits!

Thanks.

1966 Mercury M-100
1976 Ford F250 4x4

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post #9 of 11 (permalink) Old 11-29-2010, 12:37 PM Thread Starter
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I think I am going to go with this 2-3" mic.

http://www.use-enco.com/CGI/INSRIT?P...PARTPG=INLMK32

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post #10 of 11 (permalink) Old 11-29-2010, 03:54 PM
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Alright, I guess I will have to go with a 2-3" mic. for my 3" mains. Hopefully it fits!

Thanks.
The one you linked to is a good one. Ratchet is a good feature to have. Don't worry about it not fitting. The readable adjustment range is 0 to 3 but it will open farther than that.

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post #11 of 11 (permalink) Old 11-29-2010, 05:10 PM Thread Starter
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Quote:
Originally Posted by fordman59 View Post
The one you linked to is a good one. Ratchet is a good feature to have. Don't worry about it not fitting. The readable adjustment range is 0 to 3 but it will open farther than that.
Good, thanks! You've been a big help.

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