san mai with tungsten carbide

[Natlek]

Why not put a smooth edge diamond disc in your angle grinder instead?

I don t know ...I think that it is to powerful and it will break TC /it is only 1.2mm thick/ before cut was made .I mean it will be hard to control pressure , and i can t cut curve .I will try , anyway i will need one like that to smooth sides after cutting

 

[Natlek]

That's great! Do you know the cut speed? I had Omax do a trial a few years ago; their machine cut 1/8'' carbide at 3 hours per inch on garnet. Our EDM cuts about 13 inches per hour.

Sam , are you sure about time ? 3 hours to cut one inch 1/8'' thick TC or i misread your post ?
Watch this video...3 minute to cut that carbide end mill ?

 

[kdnolin]

Just a thought here.... looks like they would make a nice round knife. But I don’t know anything about leather.

 

[Sam Dean]

Sam , are you sure about time ? 3 hours to cut one inch 1/8'' thick TC or i misread your post ?
Watch this video...3 minute to cut that carbide end mill ?

I'm absolutely positive. That was with garnet abrasive in a 60,000 psi waterjet. Diamond abrasive cuts MUCH faster, but is not cost effective compared to a wire EDM. They also have higher pressure machines - again, not cost effective.

That video is not true. The endmill they cut is made from HSS. You can tell because the fluting and weldon notch on the shank were milled prior to heat treat. The cutting edges and shank OD were ground after it was hardened. A waterjet can cut hard HSS like butter.

 

[Natlek]

Ok , I decide to try first on small piece. So i will try to braze blade for folder,why not use an existing hole in TC ....BUT i have not diamond any more on edge on this small wheels .Honestly I'm surprised they lasted that long Bad news /for me/ is that i can t buy them here ......

 

[Stacy E. Apelt - Bladesmith]

You can find them on ebay and Amazon. They come in a six-pack or twelve-pack for almost nothing.

 

[Natlek]

You can find them on ebay and Amazon. They come in a six-pack or twelve-pack for almost nothing.

I stop buying from net long time ago ....things get lost till they come to me Soon i will travel to Germany so will buy everything from there .SIC stone on my bench grinder cut this thing , i will use it for fine shaping after cutting..

Well guys this thing is not that fragile as we think .............It can cut 1.5 -2mm copper wire hitting it with a blade not with hammer on spine .....
I try it on nail................no damage at all .On wood no problem .... What i CAN T do is to sharpen it to shave hair ...I have filing that diamond /800 grit are all i have/ don t cut but they fracture micro pieces from TC ....it cut smooth receipt paper /loud/ but wont shave ...for now.I need more fine diamond and some diamond paste I think

 

[Sam Dean]

Good to see some progress on this!!

There are thousands of grades of carbide - some much softer and more ductile than others. Most consist of tungsten carbides which are dispersed in a cobalt binder. You probably have a grade with fairly large carbides and a higher percentage of cobalt, which is perfect for this project. The down side is that you'll never get a razor edge because the carbide particles fall out of the binder when it's sharpened. Kind of like Stellite 6K or Talonite, which primarily has chromium carbides suspended in a cobalt binder.

Most of the carbide I work with is a C2 Micrograin grade, around 82-92Rc hardness, 6-10% cobalt. That's probably why it always cracked!

 

[Natlek]

Good to see some progress on this!!

There are thousands of grades of carbide - some much softer and more ductile than others. Most consist of tungsten carbides which are dispersed in a cobalt binder. You probably have a grade with fairly large carbides and a higher percentage of cobalt, which is perfect for this project. The down side is that you'll never get a razor edge because the carbide particles fall out of the binder when it's sharpened. Kind of like Stellite 6K or Talonite, which primarily has chromium carbides suspended in a cobalt binder.

Most of the carbide I work with is a C2 Micrograin grade, around 82-92Rc hardness, 6-10% cobalt. That's probably why it always cracked!

My friend and I braze small piece to 304 stainless from leftover I quench in water last night , no problem even with acetylene torch ...I hate when i can't proceed with work because i have not 5$ diamond !!!
I will buy extra fine diamond from DMT ...My USA friend is idiot ........ I ordered two pieces from any grit he bring to me EIGHT , all fine I think that i will success to sharpen it more with extra fine diamond and lapping on diamond paste is right word ?If I need i will visit other friend who make jewelry from ruby.We have them plenty around town in marble mines

 

[Natlek]

Good to see some progress on this!!

There are thousands of grades of carbide - some much softer and more ductile than others. Most consist of tungsten carbides which are dispersed in a cobalt binder. You probably have a grade with fairly large carbides and a higher percentage of cobalt, which is perfect for this project. The down side is that you'll never get a razor edge because the carbide particles fall out of the binder when it's sharpened. Kind of like Stellite 6K or Talonite, which primarily has chromium carbides suspended in a cobalt binder.

Most of the carbide I work with is a C2 Micrograin grade, around 82-92Rc hardness, 6-10% cobalt. That's probably why it always cracked!

Nothing done yet ,I still have not diamond disk for cutting ...My trip to Germany canceled thanks for Covid.... But i got right tool for sharpening this thing .No wonder why i can t sharpen it to shave with 800 grit DMT.....This 2 inch Dia. disk with diamond are for automatic sharpening of this carbide cutting disk .I can see diamond only with magnifier , they are that small . ...I took out the bearings of one and i will make on lathe some adapter so i can mount it on small DC motor . Any idea for what else i can use them ?

 

[sixstringsimpleton]

What do you think ? This are 1.2mm thick /solid tungsten carbide /knives for paper industry .You have no idea how sharp they are ,they make my knives to look dull ...hair popping dull
Core tungsten on sides soft stainless ? No need to HT ,nothing.......... just grind them ? Or stainless steel for core and tungsten carbide on sides ...no scratch knife
Seriously , what do you think about this ? Not for chopper , but for light cutting task why not ?

Kinda interested in trying the same thing, but I know you're in the corrugated industry
I recognize parts from a BHS corrugator anywhere, that's from the SR to cut the width.

 

[sixstringsimpleton]

What do you think ? This are 1.2mm thick /solid tungsten carbide /knives for paper industry .You have no idea how sharp they are ,they make my knives to look dull ...hair popping dull
Core tungsten on sides soft stainless ? No need to HT ,nothing.......... just grind them ? Or stainless steel for core and tungsten carbide on sides ...no scratch knife
Seriously , what do you think about this ? Not for chopper , but for light cutting task why not ?

Also, the SR blades have sharpening wheels specifically for them. If you can get a hold of the blades, you should be able to get your hands on the stones as well.

 

[Stacy E. Apelt - Bladesmith]

Welcome msixstringsimpleton.
Thus is a several year old discussion. Look at the posting dates before replying or commenting on threads when you are new.

Also, fill out your profile with your location and a bit about you so we know where you are and can better answer any questions you ask.