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Cutting tempered steel


 
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markiz41
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Joined: 16 May 2007
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PostPosted: Fri Feb 15, 2008 5:24 am    Post subject: Cutting tempered steel Reply to specific post Reply with quote

All,

This is to follow up on the thread about making your own piston pins. I got a 5/8 quenched and ground rod from McMaster, which is exactly what I need. Now I just have to cut it to length. The only means of doing that at my immediate disposal is a chop saw. Or a hand grinder. But I worry about overheating the metal and taking the temper out of it. Any suggestions?
I can have a friend cut this on a lathe or a bandsaw, just a question of time and beer.
 
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Joe(TX)
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PostPosted: Fri Feb 15, 2008 5:32 am    Post subject: Re: Cutting tempered steel Reply to specific post Reply with quote

Use the cutoff saw. go slow so there is no color change. ie does not turn blue.
 
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dobber
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PostPosted: Fri Feb 15, 2008 6:26 am    Post subject: Re: Cutting tempered steel Reply to specific post Reply with quote

That's why machine shops have large band saws with coolant pumps and newer cold cut saws now. Abrasive blades will heat the end a lot no matter how slow you try cutting it.
 
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Dick L
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Location: Edon Ohio

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PostPosted: Fri Feb 15, 2008 6:42 am    Post subject: Re: Cutting tempered steel Reply to specific post Reply with quote

We cut most of our hard pins in a spin index on a surface grinder using a cutoff wheel. We also use a post grinder using the sharp edge. Grind a vee in just a 1/4 inch or so and put the pin in water and then grind the other side. work around the pin until we can snap it off. When it starts to discolor dip it in water again. easy way to tell is hold the pin about two inches from where you are grinding with your bare hands and you will know when to cool the pin. I have cut hundreds of pins this way. We may put 20 to 30 pins in one mold.
 
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RobMD
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PostPosted: Fri Feb 15, 2008 8:15 pm    Post subject: Re: Cutting tempered steel Reply to specific post Reply with quote

Air cutoff wheel and go around the rod in a circular motion, but not continuous. Basically, tap it with the cut off wheel all the way around. AN ice cube helps a LOT.
 
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guido
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PostPosted: Sat Feb 16, 2008 11:20 am    Post subject: Re: Cutting tempered steel Reply to specific post Reply with quote


Hello Markiz41
How about you chuck the pin in a drill press,
turn it slow, and cut it with a cut off wheel in the opposite diraction that it is spinning.
If you have to, cut more than you need and dress it up after you cut it.
Guido.
 
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markiz41
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PostPosted: Sat Feb 16, 2008 11:55 am    Post subject: Re: Cutting tempered steel Reply to specific post Reply with quote

Great idea. And I can do it too, with an air grinder. Thanks, guys, love this place.
 
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