[MAXM]

Not a very smart question, I know :( ... but can kindly explain to me what's the way to measure a radius?

For example: what's a .0625 , or 1/16, radius?

Thanks,
Maxm

[mete]

From the center of the circle to outside of the circle is the radius [ radius x 2 = diameter] . When sharp edges on a gun are removed they either cut a chamfer [a cut 45 degrees to the corner ] or round off the corner. The rounded corner is part of a circle which , in your case , has a 1/16" radius.

[Werewolf]

If your question is how to physicaly measure the radius of a mechanical part then the easiest way is to get a set of radius gauges in the range you need to measure. They come in inside and outside models with some having both on the same gauge. They can be cheap to expensive with the more expensive ones being more accurate.

Each gauge has a 90 degree worth of circle cut out of a small piece of metal. You press the gauge onto the part until you find the one that fits best and that's the radius.

For large parts too big for a radius gauge a knowledge of geometry and trigonometry combined with the ability to use a variety of measuring devices is necessary.

[HSMITH]

Use the drills in your drill index to measure inside radius. You can drill out fender washers or sheet metal using your drills and then cut them to measure outside radius. Lots cheaper than gauges if you don't need them regularly.

[1911Tuner]

A Brown & Sharpe gauge set. Pricey. I can't say how much since the set I've got is 25 years old. Starrett would probably be a little less. Best thing to do is find a small job shop. Any machinist can check it for ya in two shakes.

[MAXM]

Many thanks to all, very useful explanations, now it's clear also for me.
Best regards,
Maxm