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Tool Talk Discussion Forum

Measuring small holes

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Jeff May

08-09-2005 02:40:15




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I need to measure wrist pin holes in some small engine connecting rods. They are .500" dia. I need to measure each rod to determine what the EXACT size of the hole is. We are talking down to ten thousands of an inch. They have an interference fit for the pin. I need to measure these so I know the good ones from the bad ones. Any one know how to measure a hole that small?
Dial calipers won't work, they are good for thousandths, I need down to tenths of thousandths.
Thanks,
Jeff

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Jeff May

08-11-2005 15:32:56




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
Thanks for all the suggestions. I found a local machine shop that has Intra-Mikes that small. They offered to measure them for me. The rids are connecting rods for McCulloch 2 cycle kart racing engines from the 60's and 70's.
The pistons have needle bearings on each side, the wrist pin is a press fit into the rod. That's why I wanted to know the exact bore dia. of the rods. Use the tightest ones so the pins don't work out and ruin a 30+ year old motor.
Thanks again,
Jeff

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Davis In SC

08-11-2005 20:01:35




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 Re: Measuring small holes in reply to Jeff May, 08-11-2005 15:32:56  
Jeff, since parts are rare for those motors... Have you thought of using the teflon buttons on each end of the wrist pin ??? That way. pin can never scar bore... Just a thought...



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Fred Martin

08-11-2005 13:55:06




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
Press a hardened ball bearing thru them and make them all the same size and you won"t have to measure them.....Davis, don"t they do this to make accurate holes? Fred OH



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Davis In SC

08-11-2005 19:58:10




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 Re: Measuring small holes in reply to Fred Martin, 08-11-2005 13:55:06  
Fred, yes they do use the ball method... Just have to be careful there is not too much stock left in hole, before doing it. It makes a superior finish, compresses metal structure, like a burnishing tool does..



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dr.sportster

08-10-2005 13:11:43




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
I agree with Davis and others but wont the new pistons have new pins included?I never measure this because I replace the top rod bushings and then ream the hole just enough to have a hand press fit on the wrist pin.That should equal a .001" clearance.Then the job must be checked that it is square to the bore if not I have a tool to remove the crooked hole bushing and do over with the reamer.Just trying to be helpful.

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dr.sportster

08-11-2005 13:22:56




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 Re: Measuring small holes in reply to dr.sportster, 08-10-2005 13:11:43  
Not floating pins.Nevermind.Now I see.



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Easy

08-09-2005 18:52:09




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
I agree with Davis - a hone shop will have a good bore gage. You could spend a couple of thousand dollars on bore gages, blocks and setup aids very easily. I will say that I worked with jig bore hands years ago, who could hold tenths with a telescoptic gage and a micrometer. But they did thier thing for many years, frequently usuing the same jig bore or grinder for years. Easy.



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BigMarv1085

08-09-2005 13:50:14




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
I use a set of small hole guages, and a micrometer. You can buy small hole and telescoping guages, micrometers from sears. Starret is the better brand they carry.



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Davis In SC

08-09-2005 09:09:29




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
To consistently measure to "Tenths", you need a true Bore Gage... Telescope gages are just not that close. I suggest taking the parts to a shop that does honing, they should be able to help you.



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Midwest redneck

08-09-2005 08:32:36




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
I think the best way is to buy a 1/2Dowel pin, and measure it with a micrometer. Or, get a .500" set of gagepins, .499-.501 with .0001" pin 20 pins or so in the set. We have some here at where I work. Where do you live?



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Paul in Mich

08-09-2005 08:17:53




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
Jeff, Short of purchasing a complete set of gauge pins, you may try buying a go-no go set of 2 which would serve your purpose. They come in + and - sizes so you can come within tenths. Gauging will simply identify the condition of the part, but does not in anyway correct the situation. You may need to bore or hone to rectify the condition. You may be money ahead to take your parts to a machine shop that can correctly measure and then apply the correct process to bring your parts into spec.

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Bill WI

08-09-2005 07:07:22




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
Sounds like plug gauges or a good bore mic. The plug gauges are go - no-go , highly polished. If you look in inspection gauges probably could get one size on one end and no go on the other. The plug gauges sets come in sets where go no-go gauges could probably come in one size. Don't think you'll be happy with telescoping gauges for accuracy, depending how many you're doing.



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Jerry L /AZ

08-09-2005 06:39:12




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
go to E-bay under buisness & industrial, click, a new screen comes up then go to inspection and measuring, click , then click on micrometers or hole gages. bunch to pick from. Have fun...Jer



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sawtooth

08-09-2005 03:58:32




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 Re: Measuring small holes in reply to Jeff May, 08-09-2005 02:40:15  
Use telescope gauges and a micrometer or dial bore gauges. I did that for years when I worked in toolrooms. (don't ask me where you're going to get the tools- other than have a toolmaker friend check them for you?)



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RustyFarmall

08-09-2005 05:20:00




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 Re: Measuring small holes in reply to sawtooth, 08-09-2005 03:58:32  
Try these guys.



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