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This is a discussion on RWS rifle within the Rifles forums, part of the Long Gun Forum category; Originally Posted by Machinist A quick shortcut is to measure from the inner edge of one hole to the outer edge of the other. With ...


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Old 03-23-2014, 07:32 PM   #21
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Quote:
Originally Posted by Machinist View Post
A quick shortcut is to measure from the inner edge of one hole to the outer edge of the other. With holes the same size this allows a visual measure with no math corrections. It is limited to visual accuracy but you can't properly measure holes in paper anyway and it should be accurate enough with clean holes.
Best idea so far on the targets. When I measured the pin holes in the receiver I kept moving it around till I got the smallest measurement.
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Old 03-23-2014, 07:37 PM   #22
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It's a little easier to do that using a pin as you can square the fixed jaw of your caliper on the edge. Hole micrometers make it even easier. When you have to measure the location to tenths of thousandths or even less, things get complicated.
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Old 03-23-2014, 07:48 PM   #23
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It's a little easier to do that using a pin as you can square the fixed jaw of your caliper on the edge. Hole micrometers make it even easier. When you have to measure the location to tenths of thousandths or even less, things get complicated.
That was the biggest problem, getting the calipers inside the small pin holes. I have a digital gauge and was able get a good measurement. But the measurement would change depending on how much of the calipers were inside the hole. So I worked it from every angle and settled on the lowest measurement. This was the most critical part of the entire project. If the pins had been off just a couple thousands the project would have been a bust. The go-gauge is .043 and the no-go is .046.
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Old 03-23-2014, 07:53 PM   #24
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You might have done better using one of the pins if it fit well and could be sticking out a bit. The edge of the caliper has a flat that makes error in a small hole unavoidable but it has no problem on the outside of a pin. I would always use pins with small holes.
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Old 03-23-2014, 07:54 PM   #25
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A pin also gives you a better reference on the center of holes that are lobbed or out of round, as most holes are.
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Old 03-23-2014, 07:59 PM   #26
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You might have done better using one of the pins if it fit well and could be sticking out a bit. The edge of the caliper has a flat that makes error in a small hole unavoidable but it has no problem on the outside of a pin. I would always use pins with small holes.
I was thinking of doing that but then the edge of the receiver was not parallel. I would have had to extend the receiver edge also.
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Old 03-23-2014, 08:02 PM   #27
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If the edge is a corner you can usually use it but if it's radiused or beveled then you need to clamp something to it for a reference. It seems you got a good read and good results. Careful work pays off.
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Old 03-23-2014, 08:05 PM   #28
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For really accurate measurements like that the reference edge would be put on a granite plate and a height gage used on the pin. You can measure to tenths easily or even millionths that way with proper equipment.
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Old 03-23-2014, 08:10 PM   #29
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If the edge is a corner you can usually use it but if it's radiused or beveled then you need to clamp something to it for a reference. It seems you got a good read and good results. Careful work pays off.
I took an hour to do a two minute measurement and think that was the key. Then I re-measured it the next day, and the next day. Good think I wasn't being paid by the hour.

This project was a big gamble and I could have ended up with hundreds of dollars of worthless parts if I was wrong.
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Old 03-23-2014, 08:16 PM   #30
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I have seen multi-thousand dollar parts scrapped by one careless instant. That kind of project deserves the finest care. Well done.
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Old 03-23-2014, 08:22 PM   #31
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Thanks, it was a simple project but it pushed the limits of my abilities. The hardest part was the lack of information on it.
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Old 03-24-2014, 06:08 AM   #32
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You Tube has 1000's of video on everything .

http://www.youtube.com/watch?v=_vuw9iHzgIY
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