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which material is harder ,hss tool or metal file ?
Posted: Thu Sep 20, 2012 11:45 pm
by far_cry
as the title say's which is harder and give me more cutting before it start's to wear .
i want to use this for head cutter
Posted: Thu Sep 20, 2012 11:54 pm
by inonickname
Do you mean a facemill?
HSS is made for high speed and higher temperature applications. Better than a file at least.
Ideally carbide or PCBN is a much better choice
Posted: Fri Sep 21, 2012 6:30 am
by far_cry
inonickname wrote:Do you mean a facemill?
HSS is made for high speed and higher temperature applications. Better than a file at least.
Ideally carbide or PCBN is a much better choice
Head cutter for rifling machine ,so there little amount of heat
I know that carbide is the better one but because the small cutter and the diffecalitty of sharpinig it .
So can metal file give me less wear than hss because of the low heat and the little force on the cutter.
Posted: Fri Sep 21, 2012 6:54 am
by inonickname
Nope, HSS properly hardened will do a better job.
Posted: Fri Sep 21, 2012 6:58 am
by Heimo
The way I have it, HSS has more tensile strength then the tool steel(file) but is not entirely as hard as tool steel, but tool steel breaks more easily thus it comes down to application to which is better.
but in this case I will agree with the above properly hardened HSS will do the job just fine
Posted: Fri Sep 21, 2012 7:46 am
by inonickname
Heimo wrote:The way I have it, HSS has more tensile strength then the tool steel(file) but is not entirely as hard as tool steel, but tool steel breaks more easily thus it comes down to application to which is better.
but in this case I will agree with the above properly hardened HSS will do the job just fine
High speed steel is a variety of tool steel and can be hardened to the same extent as other tool steels.
Posted: Fri Sep 21, 2012 7:47 am
by jakethebeast
yep, but the high carbon content of a file (about 1.5%) and the purioty of the steel means that when heat treated right, it will give you at least as good results as modern HSS
EDIT: if you want, we can make a some sort deal from one made from bohler k510, i have "honed" the heat treating process from it to make it ultra strong

Posted: Fri Sep 21, 2012 8:23 am
by inonickname
jakethebeast wrote:yep, but the high carbon content of a file (about 1.5%) and the purioty of the steel means that when heat treated right, it will give you at least as good results as modern HSS
EDIT: if you want, we can make a some sort deal from one made from bohler k510, i have "honed" the heat treating process from it to make it ultra strong

But HSS is available cheaply in a range of blank sizes, pre hardened to suitable hardness for cutting steels

Posted: Fri Sep 21, 2012 12:46 pm
by far_cry
thanks for the help
i did some test and i found that the HSS is better than the metal file
sharpining both and try scratch a LOCK in the hardened metal
the HSS superpass the metal file
Posted: Fri Sep 21, 2012 2:15 pm
by ramses
Remember that you must be careful when grinding the HSS bit. If it starts to discolor, it is too hot. If it gets to about blue, you have drawn the temper and it needs to be rehardened, which cannot really be done at home.
Posted: Fri Sep 21, 2012 3:44 pm
by jakethebeast
ramses, hope you remeber that with any kind of hardened steel

Posted: Sat Sep 22, 2012 12:20 pm
by far_cry
ramses wrote:Remember that you must be careful when grinding the HSS bit. If it starts to discolor, it is too hot. If it gets to about blue, you have drawn the temper and it needs to be rehardened, which cannot really be done at home.
thank you for that information
that the cause when the workpiece starts grinding the HSS cutting tool on my mini lathe .
that one hell of an advice ,thank you very much. :salute: :salute: :salute: :salute: :salute: :salute: :salute: :salute:
grinding the HSS bit is done very fast because of the small drill bit (3.5mm), but what can i do for the lathe bigger cutting tool ?