Edge size before hardening

T

TigFur

Joined
Oct 25, 2016
Messages
125
Hi,
i wonder, how thin do you go?
1mm? 0.5mm? Or maybe even a sharpened edge?

Just looking to see what people do.

Thank you for your answers, have fun

PS: Can we pretty please use milimetres? :)
 
Standard is about .03” if your wanting to prevent warping “bacon edge”.

P.S. 25.4mm=1”
 
For those metrically challenged, .010" is .25mm (for knife purposes).

The edge is dependent on the steel type. For carbon steel, you want an edge around .75mm before HT. In stainless steel, it can be much thinner, down around .25 to .10mm.
 
TigFur said:
Hi,
i wonder, how thin do you go?
1mm? 0.5mm? Or maybe even a sharpened edge?

Just looking to see what people do.

Thank you for your answers, have fun

PS: Can we pretty please use milimetres? :)
Click to expand...
If you have belt grinder leave edge thick , why risking when you can grind after HT ?
 
I would add from recent experience that if you are quenching in water, thicker is better to reduce the chance of cracking.

Grinding more after heat treatment is still faster than making a whole new blade from scratch :)
 
I leave it close to 1mm,
.8 or .9,
Less warps and don't have to worry about decarb too
 
OK, let's all make today when we finally learn metric/english conversion. For knife purposes:
1mm-.040" ...... .25mm = .010"
.010" + .25mm ..... 1" = 2.54mm
 
I could do parsecs, but while it might make sense to measure edge thickness in light years, parsecs would be silly :)
 
Ok, you guys are being silly, real metallurgists don't use parsecs. We use nanometers.
.010" + 254000 nanometers. The average edge before HT is around 1,000,000 nanometers thick.

I like to strop my finished edges to less than 10 nanometers, but the atoms keep falling off.
 
Chris Leahy said:
1mm = 0.00328084 feet :)
Click to expand...
When you say half inch , two inch....... i can get picture in my head of that .But when you start with that 1/16 , 3/64 and something like that I m lost .When someone say it is 7 mm. thick I have picture in my head of that and I can find around something that is approximately of that thickness.I always wanted to ask you , when someone say to you ............this is 7/64 do you have picture of that thickness in your head ? I ask this seriously :)
 
I think in thousandths, not fractions, in the machine shop. I once worked in a small shop that almost exclusively made parts for a European country. I learned to think metric. After a bit it's really easier.

Its said you don't really know a second language until you have dreams in that language. Systems of measurement are the same in my opinion. That said, the "English" system of measurement is a hodgepodge of gobbledygook. Inch×12=foot. Foot×3=yard. Foot×5280=mile. Fractions out the wazoo. Weight and liquid measure is just as crazy.

We honestly should have converted in the 70s when it was talked about. By now we'd all be dreaming in metric!
 
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