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Thread: Hollowing rig questions

  1. #1
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    Hollowing rig questions

    I have finally started to weld up a hollowing rig system. Today I welded up a "D-Arm" from 3/4" stainless steel shaft. I also welded up a back support rest....which brings me to my first question. I'm building a rig like this https://www.lylejamieson.com/tools/tool_howto.asp . It calls for a backrest of anywhere from 30-38" across. One place one his website he says 30-32" and another he says 38"...My question is....do I really need it that wide? In the case of 38" he states that it should have 10" in front of lathe and 28" in the rear.
    I know some of you have made your back rests so that you can slide them forward and back and I may make mine that way too...just looking at my options. I'll get some photos of it all in the next couple of days.
    I also will then be trying to figure out how to make the cutting tips. My boring bars will be 3/4" bar as well but I need to know how to attach the cutting tools to the tip of the bars.
    It's not what you achieve in life...It's what you overcome!

  2. #2
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    Tom, I'd recommend making the back rest as wide as possible. You'll be glad to have the extra movement capability.

    For mounting the tips, search the forum for a thread I started a couple years ago about making boring bars. I think the thread title is something like 'A boring day in the shop'. (I'd search for you, but I'm on my phone, so pasting links is a pain.)
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  3. #3
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    Thanks Vaughn, I'll look it up.
    It's not what you achieve in life...It's what you overcome!

  4. #4
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    I agree with Vaughn and would go around 36". You will be glad for the extra movement in the unit. Mine is around 34 1/2" and sometimes I wish I had a couple more inches.
    Bernie W.

    Retirement: Thats when you return from work one day
    and say, Hi, Honey, Im home forever.

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  5. #5
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    Quote Originally Posted by Bernie Weishapl View Post
    I agree with Vaughn and would go around 36". You will be glad for the extra movement in the unit. Mine is around 34 1/2" and sometimes I wish I had a couple more inches.
    I welded up my back rest at 32" however I still need to mount it to the base so maybe I'll come up with a way to slide it on the base forward and backward a few inches to give me that extra length. My lathe sits up against a wall and even at 32" I would still need to pull it away from the wall to use it. I thought I was just saving myself from having to pull it from the wall but I guess I just will have to do that when needed.
    Last edited by Tom Baugues; 04-13-2011 at 12:10 AM.
    It's not what you achieve in life...It's what you overcome!

  6. #6
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    Quote Originally Posted by Tom Baugues View Post
    Thanks Vaughn, I'll look it up.
    I found it, Tom...

    http://familywoodworking.org/forums/...ad.php?t=13507

    Note that in post #29 I make a correction on the size of the tool bits. They were 3/6" bits, not 1/4".
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  7. #7
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    I hear your pain Tom. I had to move mine away from the wall a few inches.
    Bernie W.

    Retirement: Thats when you return from work one day
    and say, Hi, Honey, Im home forever.

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  8. #8
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    Quote Originally Posted by Vaughn McMillan View Post
    I found it, Tom...

    http://familywoodworking.org/forums/...ad.php?t=13507

    Note that in post #29 I make a correction on the size of the tool bits. They were 3/6" bits, not 1/4".
    Thanks Vaughn, that helps alot. I have quite a bit of stainless steel shaft here now of several different sizes to make tools with. I saved several old shafts from some machine repair work that I do. I should have enough for a dozen or so tools if needed. I'll now have to be on the look out for square HSS bits.
    It's not what you achieve in life...It's what you overcome!

  9. #9
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    Quote Originally Posted by Tom Baugues View Post
    ...I'll now have to be on the look out for square HSS bits.
    Look no further...

    http://www.use-enco.com/CGI/INSRAR?PMSECT=0000000747

    Pick a size and material. In my experience, the HSS ones work just as well as the cobalt ones. (As I understand it, metalworking benefits from using the cobalt bits because they withstand high temps better. Cutting wood doesn't get the bits hot enough to make a difference.) I've bought the 2" or 3" long ones and cut them (snapped, actually) into two shorter bits.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  10. #10
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    Quote Originally Posted by Vaughn McMillan View Post
    I found it, Tom...

    http://familywoodworking.org/forums/...ad.php?t=13507

    Note that in post #29 I make a correction on the size of the tool bits. They were 3/6" bits, not 1/4".
    I am supposing you meant 3/16?

    And what is meant by back rest is it the part the back of the tool steel holder slides through that captures it & keeps it from twisting or turning?
    "Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
    "If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart

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