Ranking of Steels in Categories based on Edge Retention cutting 5/8" rope

You are correct. I read stronger carbide 'Former' and mistakenly thought it was stronger carbide. Kind of feel silly now. So now even on paper the K390 is better for cutting longer with abrasive materials. I am glad that is cleared up in my mind even though I made an error while reading. Thank you for clearing that up.


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chiral.grolim said:
What's going on with the grind, Jim? It looks like the maker beveled the primary twice? Looking forward to the review :thumbup:
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Still in the process now, up to 5,000 linear FT of cardboard and still going, trying to decide how far I want to go with this.

Stop at 5,500 FT like I have been or keep going.... :eek:
 
Do you now how many microns your 400 grit stone is Jim. Seems there is a range on 400 grit and microns seem about the only consistency. Could you pass on the make as I need a new course stone for my edge pro. I'm sure others are interested to know too.

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NjMS said:
Do you now how many microns your 400 grit stone is Jim. Seems there is a range on 400 grit and microns seem about the only consistency. Could you pass on the make as I need a new course stone for my edge pro. I'm sure others are interested to know too.

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It's 40 Microns from the info I have.
 
Can someone educate me on the glossary of terms used aside from the sae 10xx system? Like I kind of understand the high carbon grade system, but I don't get some of the other ways to address other types of metal and what they contain and for what purpose?
 
No kidding. Gonna name my first child Maxamet.

Thanks Jim:thumbup:
 
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The width of the edge shoulders make the performance really stand out. The number of cuts is almost identical to the 125V blade just above it, but the edge width is three times wider. Truly impressive, especially for a production blade.
 
Twindog said:
The width of the edge shoulders make the performance really stand out. The number of cuts is almost identical to the 125V blade just above it, but the edge width is three times wider. Truly impressive, especially for a production blade.
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It's an interesting steel.
 
Geez... we need to get Jim a bionic arm or something!

This thing is the closest to WC-Co you can get in steel...

I am very glad it performed well at 15-dps in the full review as well :thumbup: The 0.018" BET makes it suitable for a lot of other utility-purposes, but I can imagine that it was annoying for Jim pushing an edge that much thicker through all the cardboard :eek: I'd be afraid that this steel taken down to 0.005" would fracture massively if the edge ever bound-up in something, given how like it is to cemented carbide...

Another thing i wonder - Maxamet's likeness to WC-Co also lends it to very hot working hardness, i.e. it doesn't lose its temper easily. From the datasheet: http://cartech.ides.com/datasheet.aspx?i=103&e=84&c=techart

The hot hardness of Micro-Melt Maxamet alloy tempered at 1025°F (552°C) to a room temperature hardness of HRC 70.0 was measured as HRC 63.0 at a test temperature of 1000°F (538°C).
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It is important to recognize that the carpenter test uses 1000'F/500'C specifically because a number of studies have shown this to be ABOVE the maximum temperature transferred to the cutting tool or work-piece during typical power-grinding dry (no coolant or lubrication). I have many times questioned assertions that power-sharpening (which isn't generally capable of getting anywhere even close to 500'C) necessarily generates sufficient heat to affect edge-temper - particularly since that would mean that cutting alot of cardboard would have the same affect - but here is a case where it wouldn't even matter :cool:
 
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