Quote:
Originally Posted by gubnavnania
I saw the tubing at: http://www.metalliferous.com/pdf/sil...und%20Tube.pdf (stock# STB409B)
Anyone has any idea how big is 0.20" in mm? This tube might fit perfectly for Pandora (if the tube has 4.5mm ID) and you still can use your 3/16" mandrel.
Does Rio Grande have the same size of tubing? |
Hi Gubnavnania,
That will not work for Pandora beads. The ID of that tube will be 3.984 mm.
Here's how it works: Take the OD, and subtract 2 X the wall thickness (WT) to get the ID. Wall thickness (WT) is 0.020 inch. In mm, that is: .02*25.4=0.508 mm. Now take the OD minus two times the wall thickness:
5.0 mm - 1.016 mm = ID = 3.984 mm, less than 4.3 mm, so it won't fit on the bracelet.
To see why that formula works, draw a 1 inch circle. Now, inside that, draw a slightly smaller circle. The big one is the OD, the small one is the ID. Now it should be clear that the diameter of the inner circle is the the OD - 2X the distance between the circles. Or, ID = OD - 2 X WT.
For more on this stuff, see this thread in the Tips and Techniques Forum:
Od'ing on mm and inches...etc.
http://www.lampworketc.com/forums/sh...ad.php?t=90295
Take Care,
Dave