steel sizes

[SPEC]

Cold rolled is just that ..It's rolled to it's thickness wnen it has cooled off, making the ''grains'' more uniform and compressed.   Whereas hot rolled is rolled to a slighly thicker dim. while still red hot and left to cool,thus shrinking to it's final thickness...and the thickness will vary and so will the density.. Hot rolled steel tends to be softer, and more ''Sticky'' when machining...I'm no machinest and 20 years ago in school they say it was sticky due to the grains not being compressed,and stringy.. Now not to split hair but that chunk of alloy I sent you machined nice didn't it?
Alloys are a whole nother topic

[Admin]

Yes alloys and cold rolled machines like a wet dream...

[southernford246]

what would be 20nbx2.3mm

[SPEC]

huh?

[SPEC]

google  CONVERT
It's a program that will do all of your metric to SAE for you

[Rick S.]

For The Edge plans nb is "nominal bore"
2.3mm would be the wall thickness.
I use 1" O.D. x 3/4" I.D. (1/8 wall) DOM for a arm pivot tubes.
For the arms themselves  I use 1" O.D. 12ga. DOM
 

[southernford246]

for the piranha the gear shift tube and the rear arms

[Rick S.]

For the gear shift tube I use 7/8 O.D. x 14ga.
You need the 7/8 O.D. to fit your motorcycle clutch perch assembly.
For the a arms I use what I posted earlier.

[southernford246]

im talking about the tube that you weld in the upper frame to mount the gearshifter

[Rick S.]

I don't set mine up that way, but I would probably use 1" O.D. x 3/4 I.D. DOM
then you could use standard 1/2" I.D. x 3/4 O.D. oilite flange bushings for the pivot.
Or turn up some delrin bushings to fit that size.

[southernford246]

ooo that might be better

[Jerry]

http://www.emachineshop.com/machine-shop/Metal-Gauge-Chart/page344.html

Here is a chart

[Rick S.]

The charts are fine for sheet steel, but tubing gauge sizes can be different.
For tubing I'd check with whoever you're buying your steel from.

[southernford246]

ya i will have to wait till monday because they are all off till then

[southernford246]

whats the standard lengths of tube steel ??