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  1. #41
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    If you are making a lot of these parts you could invest in a rotary lapping table where you lay the parts concave side down and lap one side just using the weight of the part. Than grind the second side on a magnet. We have done this on many of our parts. Piston rings for auto cylinders are often ground this way.
    Google "Rotary Lapping Machines" like this: Lapmaster 24″ Open Face Lapping Machine – Longoria Refurbished Equipment
    Last edited by juergenwt; 02-19-2020 at 05:51 PM.

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  3. #42
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    Quote Originally Posted by juergenwt View Post
    If you are making a lot of these parts you could invest in a rotary lapping table ...
    Damn, Juergen ! Sometimes the obvious is too obvious, grazie ! Finally a real reason to buy a benchtop lapper. Stang, you oughta do this, it's perfect !

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  5. #43
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    Quote Originally Posted by gbent View Post
    If I read your post correctly, you are liquid nitrogen cooling the blades after quench and before temper? If so, that would be a no-no for most steels.
    I am no steel expert but I did research this particular steel and that seems to be the best practice. The reason to cryo asap is to reach max hardness and minimize retained austenite. There is a greater risk of cracking but so far I have been good. I immediately flash temper after this. I am shooting for a high hardness and uniform / fine grain structure. I am happy with my current protocol for this steel.

  6. #44
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    Quote Originally Posted by juergenwt View Post
    If you are making a lot of these parts you could invest in a rotary lapping table where you lay the parts concave side down and lap one side just using the weight of the part. Than grind the second side on a magnet. We have done this on many of our parts. Piston rings for auto cylinders are often ground this way.
    Google "Rotary Lapping Machines" like this: Lapmaster 24″ Open Face Lapping Machine – Longoria Refurbished Equipment
    Hopefully one day...

  7. #45
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    Quote Originally Posted by EmanuelGoldstein View Post
    Damn, Juergen ! Sometimes the obvious is too obvious, grazie ! Finally a real reason to buy a benchtop lapper. Stang, you oughta do this, it's perfect !
    Talk about slow and long cycles... here it is. A last resort machine and hopefully only a few thou or few tenths stock.
    Bob

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    Quote Originally Posted by CarbideBob View Post
    Talk about slow and long cycles... here it is. A last resort machine and hopefully only a few thou or few tenths stock.
    Bob, he makes five a month. Wants to get up to 20. Only has two hands. Benchtop lapper takes a tiny amount of space and is mostly self-tending. Throw five blanks on, three days later take them off and throw on another five ... and no fiddling around on the surface grinder.

    I'd be out there looking already

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