drill precise 1.124" diameter hole in 12L14 Carbon Steel
drill precise 1.124" diameter hole in 12L14 Carbon Steel
(OP)
I need to drill a hole which will house a ball bearing in a piece of 12L14 steel. I would like the hole to be 1.124" +0 -.0005. I usually use a reamer for a precise hole, but I didn't find a reamer that large and anyway large reamers are very expensive. The only way I can think to do this is with a boring head. But, I don't have an inside micrometer and can't find gage pins the right size. I thought of using 2 gage pins next to each other whose diameters add to 1.124". I also thought about making a gage pin. Any suggestions would be appreciated.





RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
Mike Halloran
Pembroke Pines, FL, USA
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
2. If your hole is that important you might want to pay someone to bore it.
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
Measuring to <.0005" with a telescope gage can be tough.
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
Use a CMM, but this may be overkill.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
At a minimum it would normally take a 3-point micrometer to measure and check circularity, taper, etc.
You can forget about drilling with that accuracy as the old probable hole size rule will get you unless you drill and ream..
Another option would be to jig grind the old drilled hole.
Another possible option might be to take the precision out of mounting the bearing by using Tolerance Rings.
http://www.usatolerancerings.com/
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
For some help in checking with the plug gage you can put a 1/8 lead 1.123 in front to help you get started, but than you need to go deeper than 1/8 in order to check.
RE: drill precise 1.124" diameter hole in 12L14 Carbon Steel
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