![]() I can't measure a hole that close but I can measure a pin. My lapping might be 400 grit with a dowel in a collet. I was thinking of how to make poor man's deltronic pins. Ps.: Oversize pins are available +.001 inch. ![]() ![]() If it goes in nice and snug - the hole is OK. A good thing to have is a lapped down dowel pin ( -0.0002) for each size. A 12 H7 reamer is made to +.008 to +.015 mm. Use reamer H7 (12 H7)- Metric reamers are marked for the hole they make, so if you measure the reamer with a micrometer do not use like an h7 tolerance as you would to measure a shaft -īut be aware that reamers are made to special sizes to give you max. Toolsteels like O-1, A-2 holes may open up just slightly. In that case you may want to go and use a reamer close to the nominal size like 1/8 (.1250) or 1/4 (.2500). Remember if you are using CRS like 1018 and are case hardening your holes will shrink, depending on case dept. Depending on material you will be using and if you are heat treating. Help!ĬlutchDowel pins inch size are +.0002 nominal size. Just thought a bit, just because a reamer is a certain size, doesn't mean it makes that sized hole. ![]() Now the next question is, what is the rule of thumb for the slip fit side? I realize that the number of pins, length, ect would be factors. Now steel on the press fit is normally (at least for me) 0.001 per inch so but dowels are actually over sized so an 'on size' reamer seems to be the ticket for steel. I need to use some 1/8, 3/32, and 3/16 inch dowels in both steel and brass. I'm trying to noodle out what sized reamers to buy. ![]()
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