I will not go into that as most jewelers use very small drill bits. But I decided that I should include additional information as it makes the discussion complete.Ī common standard for metric drill sizes is the Renard series, which uses a simple factor to determine the diameter. inches to centimeters, multiply by 2.As a jeweler you really should be using metric drill bits.inches to millimeters, multiply by 25.4.9448, which rounds to 1, so you get 1/4 of an inch (which happens to be accurate) 315, which rounds to 0, so you get 0/4 of an inch (not a very useful number!) Using the numbers from step 1, that I also used in step 2, you would get. To round to the nearest 1/4 of an inch, simply replace all the 16's in Step 2's examples with 4's. If you are not making jewelry, or your needs are not very exact, then you can round to a larger fraction such as 1/4. don't forget to add the 1 back on, so this is really 1-9/16 inch.įor jewelry purposes, I don't recommend rounding to larger fractions, such as 1/4, or even 1/8 inch. don't forget to add the 1 back on, so this is really 1-3/16 inch.ġ.5748 Removing the 1 gives you. 1811 times 16 = 2.9, which rounds to 3, so about 3/16 inch. For amounts over an inch, it is easiest to remove the whole inches, and add them back in after you convert the portion after the decimal point:ġ.1811 Removing the 1 gives you.The resulting number is how many 1/16's of an inch you have. To round to the nearest 1/16 of an inch, multiply your decimal by 16. I prefer to round to the nearest 1/16 of an inch. Step two: Converting your decimal to a useable fraction:.If, however, you want fractions of an inch (1/16, 1/4, 1/2), rather than a decimal, try this: Since you probably need to reserve a bit of space for your bead tips and a clasp, I would round down to 80 beads. 2362 inches (per bead) = 84.67 beads per necklace. From Example 2 above, you know that a 6mm bead =. If you are trying to figure out how many 6mm beads you need for a 20" necklace, you can use this decimal value directly. (or divide your centimeter amount by 2.54)Įxample 1: 2mm divided by 25.4 =.
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