Welding a Sunnen honing adapter
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  1. #1
    Join Date
    Nov 2014
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    35

    Welding a Sunnen honing adapter

    Sunnen honing adapters (e.g. K6-A, K8-A, AK20-A, etc.) are non-magnetic. Has anyone ever successfully welded to them and, if so, what TIG filler rod works? I'd like to adapt an old one to hold a small 3-jaw chuck for external honing and starting from an existing adapter would be faster than machining one from scratch. Thanks in advance for any help.

  2. #2
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    Nov 2014
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    Re: Welding a Sunnen honing adapter

    Most guys use 309 for oddball stuff. I’d use my 312 stainless filler. Really good rod also.

  3. #3
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    Nov 2014
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    35

    Re: Welding a Sunnen honing adapter

    Quote Originally Posted by motolife313 View Post
    Most guys use 309 for oddball stuff. I’d use my 312 stainless filler.
    Actually, I think it's a non-Fe alloy.

  4. #4
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    Re: Welding a Sunnen honing adapter

    Quote Originally Posted by MCTig View Post
    Actually, I think it's a non-Fe alloy.
    I kind of doubt that, unless it's aluminum or titanium Have you tried to see if it will file. I'm betting it's "glass hard".
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  5. #5
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    Nov 2014
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    Re: Welding a Sunnen honing adapter

    Quote Originally Posted by CAVEMANN View Post
    I kind of doubt that, unless it's aluminum...I'm betting it's "glass hard".
    Non-Fe includes aluminum. And you lose that bet since it's less than RocC 40, and there are no sparks when held against a grinding wheel.

  6. #6
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    Re: Welding a Sunnen honing adapter

    Quote Originally Posted by MCTig View Post
    Non-Fe includes aluminum. And you lose that bet since it's less than RocC 40, and there are no sparks when held against a grinding wheel.
    Duh, any standard moron knows that. I was basing my thoughts on the large milling machine adapters I've dealt with.
    Last edited by CAVEMANN; 11-12-2018 at 10:11 AM.
    NRA LIFE MEMBER
    UNITWELD 175 AMP 3 IN1 DC MIG/STICK/TIG
    MIDSTATES 300 AMP AC MACHINE
    GOD BLESS AMERICA!
    “Freedom is never more than one generation away from extinction.
    We didn’t pass it to our children in the bloodstream".
    RONALD REAGAN

  7. #7
    Join Date
    Sep 2009
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    171

    Re: Welding a Sunnen honing adapter

    I believe those are made of aluminum. What alloy I don't know. Maybe snoop around there website and they might say what there made of. I have an old Ammco hone which is similar to a Sunnen machine. I use Superior style mandrals and they are defiantly aluminum.

  8. #8
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    Nov 2014
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    35

    Re: Welding a Sunnen honing adapter

    Quote Originally Posted by vpd66 View Post
    Maybe snoop around there website and they might say what there made of.
    Lack of information on their composition brought me here in the hopes someone else had dealt with this issue in the past. I know how to proceed with oily cast Al if that's what it is, but I'd rather know for sure what it is ahead of time.

  9. #9
    Join Date
    Oct 2007
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    141

    Re: Welding a Sunnen honing adapter

    It’s been half a century since I did honing. I’d guess they are anodized aluminum. Post a picture.

    You could disassemble them down to bare bones and do some simple math volume calculations. Aluminum is about .101 pounds per cu.in while steel is about .283 pound per cu. in.

    Maybe just file an edge anodizing is pretty hard but not real thick. Steel will file easily

  10. #10
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    Nov 2014
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    35

    Re: Welding a Sunnen honing adapter

    Quote Originally Posted by bentwings View Post
    ... Post a picture. ...You could disassemble them down to bare bones and do some simple math volume calculations.
    Photos of them are very easy to find on the web. To repeat my question is "Has anyone ever successfully welded to them and, if so, what TIG filler rod works?"

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