Knife Sharpness Testing

The CATRA edge testing machine is manufactured to ISO 8442.5 It provides accurate measurement of sharpness and cutting edge life of all types of blades and knives. Here is shown the machine being used to test a kitchen knife. For full details see www.catra.org

Category:

Entertainment

Tags:

• sharpness
• test
• testing
• blade
• knife
• cutting
• sharp

[CATRAUK]

Well the inclusion of carbides in a soft steel actually makes it a harder steel. Hardness is the attribute you get when you look at the steel as a whole. Our machine is really measuring the wear resistance in a cutting environment, so if ther carbides in your particular steel are going to improve wear resistance during cutting then this machine will measure that improved performance.

[HermanW666]

Is this only a test of wear resistance(abrasion of metal at the edge), or will it also test hardness(edge rolling) and toughness(chipping/micro-chipp­ing)?

[CATRAUK]

@HermanW666

The machine measures the effective wear resistance of the cutting edge, which is a function of the steel hardness. So from the results you can infer the hardness.  To the best of our knowledge there isa no otherway of measuring the hardness of the edge within the first 5 microns. If the edge has poor sharpness retention then the edge is soft and very likely to roll, if it has brilliant edge retenetion, then the edge is very hard and likey to chip if missused ( cf ceramic knives)

[bogdan1bogdan]

i guess you have some experience if you tested over20.000 knifes; how does a ceramic blade behaves?.. compared to an average steel blade?

[CATRAUK]

@bogdan1bogdan

Ceramic blades generally are slightly sharper than the average steel blade and they last about 10-30 times longer between sharpening. BUT they tend to be much more easily chipped on the cutting edge and so extreme care is needed when handling, washing etc. Also re- sharpening for both the average home and professional users is difficult if not impossible and they need to be returned to the manufacturer or to specialists like us at CATRA.

[CATRAUK]

@xtreme2324

Please explain why ?

We have tested over 20,000 knives earning $1.6 million

and sold 30 such machines earning $ 2.4 million

if this sucks I think I will keep sucking?

[HolaImSkiitzy]

So with the 4 million dollars you earned, not 100 bucks was spared on a decent camera with audio capabilities? Dedicated salesmen right here.

[audiracing82]

Have you tested the evercut knife? Is it really that good?

[JonoNZ110]

@CATRAUK What about a highly alloyed steel with large, hard carbides, but low hardness of the steel? Wouldn't this make the results inaccurate as carbide size and distribution largely affect wear resistance?

[TheOutdoorsman07]

i prefer to test my knife sharpness the natural way, not with "technology."

[fappometer14]

How would a D2 tool steel handle against say, aus 8?

[3TOAO3]

HOLY SHIT IT CUTS THROUGH PAPER I MUST BUY.... -____-

[RebelWrestler45]

@HermanW666 Its only a test of wear resistance, which usually corresponds to hardness. it doesn't test toughness or ductility.

[CATRAUK]

@chefgiovanni

How do you know its sharper, Have they got a tester?