The Stovebolt Site Forums The Shop Area Paint and Body Shop Doors door hinge pins 11/32 & what is R bit

I was reading V6 Fix Modelmans post in the tool forum, I think, about sandblasting and he had a link to a guy named Deve's restoration photos. In that link Deve mentioned "for a perfect fit use 11/32 bit to drill out the hinge and a "R" bit to drill the hinge frame. Now I know this guy was working on a 50 model so the first question is the hinges the same?
If so then the 11/32 bit is to drill out the hinge (PINS?) and the R bit to drill out "hinge frame"....WHAT IS AN R BIT?? and am i understanding the rest of this correctly about drilling out the pin. (what do you drill out on the hinge "frame". Does anyone understand what I'm asking or am I starting to ramble? Thanks

It's a size bit that in between the fractions, I often wondered myself untill I looked a drill bit chart & seen the whole alphabet was used & how they were being used...

http://en.wikipedia.org/wiki/Drill_bit_sizes

Chip - he's meaning use the slightly larger size drill on one half of the hinge, then the pin will be "stuck" in the hinge half with the smaller hole, and pivot in the hinge half with the bigger hole

Bill

Zookeeper/red58: thanks guys. That clears it up. I have my hinges out and I also have new hinge pins that I ordered. Before I go to drilling I want to make sure I'm doing it right as I only get one shot it. I've saved one of the old pins to compare with the new and even mic'd them with dial indicators to see the difference.
Zookeeper: good reading on the link you gave me. I have put it in my favorites. I looked around for a while trying to find the "R" bit chart to see what "size" it is but didn't see that. I guess I just need to buy a "R" bit!
From what I read the "center" moving piece of the hinge is to be drilled with the 11/32 bit so it will pivot easy and the R bit is to drill the top and bottom hole of the hinge to hold the ends of the hinge pins....correct?
OR should the pin be stuck in the center hinge piece and pivot on the top and bottom holes? I understand whats being said....I just want to be dang sure which pivots, or turns, on the pin.
You know, idiot proof it

I'd make the single center part the loose one

Bill

Achipmonk that makes perfect cents by drilling the hinge out 11/32 = .343 dia and then drilling out the hinge frame R=.339 dia that would give you .005 thousands of an inch bigger hole to pivit freely in as long as the hinge pins are 11/32 dia. personally i would lap the hinge out. better control then using a drill . as drills normal cut over size unless you round the corners with a stone and then they work almost like a reamer. without the cost of buying the reamer.

Chip, The proper tap drill size often falls in between the standard "fractional" drill sizes, so to cover these we have the "letter" drill index for the larger sizes and the "number" drill indexs for the smaller ones. Generally the "number" drills are split into two different indexes, 1 thru 60 is the larges and the smallest 61 thru 80.

Here are just a few charts you might want to print out to keep around the bench.
http://www.carbidedepot.com/formulas-drillsize.htm
http://www.gearhob.com/eng/design/drill_eng.htm
http://sosnick.uchicago.edu/tap_drill_size.html
http://www.engineersedge.com/drill_sizes.htm
http://www.engineersedge.com/tap_drill_chart.htm
http://icrank.com/cgi-bin/pageman/pageout.cgi?path=/tapsizechart.htm&t=2
http://icrank.com/cgi-bin/pageman/pageout.cgi?path=/drillsizechart.htm&t=2

Denny Graham
Sandwich, IL

Got it. Thanks guys.

denny, great call... i am gonna go out on a limb here and say that you also have some type of machining backround...

Deve is a buddy of mine, and let me tell you, he is a perfectionist, and did a lot of research to know the correct drill bit sizes for the hinges. He also did mine, and they work perfectly. Be sure to use a drill press for this job. I am sure his website tells you that also.