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  #1  
Old 12-27-2015, 08:55 AM
SEngraver SEngraver is offline
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Default Hss Gravers

Hi Folks
I need some advice on hss gravers.I used a grinding stone to make/shape the top profiles on my flats only to notice after, I had done them a couple had turned a straw yellow colour at the tip which was against the grinding stone.
These are the yellow tang hss gravers flats.Has this affected the gravers?
Can the flat gravers be used as before, or can this be corrected,will the colour change affect the hardness ?
These are my palm push gravers and I am attached to them as they are the gravers I started out with and still on occasions use them.
SE

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  #2  
Old 12-27-2015, 01:20 PM
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JJ Roberts JJ Roberts is offline
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Default Re: Hss Gravers

SEngraver,Are you using power when grinding your graver's? if so are you putting the graver in and out of water to keep the graver from over heating and losing the temper in the tool? J.J.
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  #3  
Old 12-27-2015, 03:31 PM
SEngraver SEngraver is offline
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Default Re: Hss Gravers

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Originally Posted by JJ Roberts View Post
SEngraver,Are you using power when grinding your graver's? if so are you putting the graver in and out of water to keep the graver from over heating and losing the temper in the tool? J.J.
Hi JJ
Yes ,thats the same I been doing,but I must have held a bit long without quenching.But I have a four inch grinding stone in a power screwdriver and drill machine its is not all that fast ,speed can be regulated by the trigger switch.
SE
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  #4  
Old 12-27-2015, 06:37 PM
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Sam Welch Sam Welch is offline
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Default Re: Hss Gravers

Straw color is used in judging tempering of hardened steel. While it may have softened the area a bit more than the tool already was the only way to see if it still works OK is to use it. I have never had straw color ruin a tool but beware blue.
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  #5  
Old 12-27-2015, 06:42 PM
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Bert Edmonston Bert Edmonston is offline
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Default Re: Hss Gravers

The straw color you mention is not going to effect the performance of your graver. If you super heat the graver to the point it gets dark or worse yet "red" hot, then you've got a problem.

One of the things I find helpful in shaping gravers and making an extremely small tip/face is to use "mizzy" heatless grinding wheels. Most jewelry supply companies sell them.
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  #6  
Old 12-27-2015, 07:19 PM
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Steve Lindsay Steve Lindsay is offline
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Default Re: Hss Gravers

Try engraving with it and see if the point holds up.

If it was a tanged graver it may be a carbon or tool steel rather than hss. They will not take the heat as well as high speed steels i.e. M2 or M42. Generally tool steels i.e. W1, O1, A2, D2, 440C have lower tempering temperatures (starting at 300F and up, according to how much it is desired to pull the hardness back). M2 and M42 would need to get above 1000F before it starts to lower the hardness.

If wanting to make a spring from w1 or o1, after hardening, temper to 650f and it should be in the range 52-54RC. This doesn't work so well for a graver though. 400F may be about right for a graver from w1 or o1 through. Looking in the book that should bring it down to 60rc. So if the graver were made from carbon or tool steel try to keep it below 400f when sharpening.

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  #7  
Old 12-28-2015, 01:08 AM
SEngraver SEngraver is offline
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Default Re: Hss Gravers

Hello,
Thank you folks JJ,Bert E,Sam W ,and Steve L.my mind is at peace now.HEAPS of thanks to all.These gravers are precious to me.

Steve the gravers have HSS Glardon Valorbe( swiss made) etched on them so I thought they were HSS .They are yellow tanged.

Much Appreciated
SE
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  #8  
Old 12-28-2015, 06:09 AM
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Sam Welch Sam Welch is offline
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Default Re: Hss Gravers

Those are excellent gravers.
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Old 12-28-2015, 07:19 AM
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Default Re: Hss Gravers

Ok, good. They should be fine up to 1000f.
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  #10  
Old 12-29-2015, 01:15 AM
SEngraver SEngraver is offline
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Default Re: Hss Gravers

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Originally Posted by Steve Lindsay View Post
Ok, good. They should be fine up to 1000f.
HI Steve
Thank you for the heat colour chart,it is an excellent source for reference
SE
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  #11  
Old 12-29-2015, 01:33 AM
SEngraver SEngraver is offline
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Default Re: Hss Gravers

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Originally Posted by Sam Welch View Post
Those are excellent gravers.
Hi,
Indeed they are good they have lasted a long time and still going fine.
SE
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