angus murray
Aluminum
- Joined
- Dec 31, 2008
- Location
- miami florida
Is there any standard in machinists handbooks for determining the correct drill size in relation to roll pin diameter when drilling the holes? Thanks in advance for any help given.
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Brevity is the essence of something.(PS: while I was writing and checking this, Leigh typed the same thing more succinctly)
Hmmm...Lord Polonius, Hamlet, Wm. Shakespeare
I'm not sure of any rule, but making the hole .020" under per inch diameter has always worked for me. Usually I work with roll pins up to .250" dia.
Just checked MH, and it gives no info on roll pins (at least my 1940s ed.)
Roll pins are sized by the diameter of the required hole, i.e. a 1/8" roll pin will fit tightly in a 1/8" hole.
No calculation required.
- Leigh
take roll pin and use a drill bit gage plate the ones with holes drilled in a plate to quickly find drill bit size
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usually .250 roll pin needs .265 hole to go in by hand. not sure exact size but the definitely are bigger than stated size and they compress smaller to go in a hole
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drill bit gage plate - Google Search
.Yeah, I got caught by this too. About a week before Christmas, the boss says he wants to help out a neighbor... a glass shelf in the cabinet that housed her ceramic figurine collection had collapsed, jamming the doors, and it took hours for her daughter, the only one with arms small enough to fish the figurines out through the small amount they could open the door, to clear the wreckage. A postmortem determined that while the glass shelves could handle the load without deflection, the crappy shelf clips had failed. I suggested he replace them with stainless dowel pins, and to keep from wrecking the wood veneer with pins that would stick in the holes, I suggested we order 6mm dowels (.236" dia.) At the last minute, someone noticed that stainless roll pins were considerably cheaper than dowels, and substituted them on the order. Well, damned, can you believe a 6mm roll pin is larger than 1/4"? About .257" dia or so. This is now the DAY BEFORE CHRISTMAS EVE, and I still need to source four dozen 6mm dowels. Luckily McMaster had them in stock, but I am NEVER going to forget that roll pins are larger than their nominal size.
Dennis
We can make it official.
Roll pins are sized by the diameter of the required hole, i.e. a 1/8" roll pin will fit tightly in a 1/8" hole.
No calculation required.
- Leigh[/QUOTE
I understand this is a mature thread but, I have a few questions (no machinist here).
I will install six 1/4" X 2" spring pins centered in six holes (likely A36 or 1018, 3/4" thick).
What drill bit should I use (Cobalt, HSS, etc.)?
I'll be using a 3/8" hand held electric drill (no drill press available here in the woods and mountains of Alabama) and also need advice regarding the correct cutting fluid/lubricant to insure a clean hole without breaking the bit.
I plan to drive the split pin through the hole using a hammer. If the hammered end of the pin mushrooms a bit, no worry.
Any help and advice is appreciated.
Thanks.
Dennis
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