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  1. #1
    Join Date
    Feb 2009
    Location
    moonbi nsw Aus
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    69
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    364

    Default Stiffening Post on Drilling Machine.

    I have a Chinese (origin) Radial drill Press. I intend to use it for mainly drilling timber as I have another normal drill press with a compound vise setup on it for drilling steel. I want the Radial ability to give me more "reach" for what ever project came up.
    You guessed it....its a floor standing model with a length of, probably, too light for the purpose, tube as the post and it tends to flex if you go in a bit hard.
    So here is my question to the combined brains trust....If I were to mix up a strong brew of concrete and fill the post, do you think it would stiffen the post? A new bit of heavy walled tube would do the job , I know, but I don't have access to a lathe around 1200long to machine the tube to the correct diameter (and I would have to mortgage a child or pet to get it done)
    Ideas and thoughts/criticism welcome.(Just be gentle with the critisisms I am still a little delicate)
    Just do it!

    Kind regards Rod

  2. #2
    Join Date
    Jul 2010
    Location
    Melbourne
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    Default

    Hi,
    I think I know the sort of drill you are talking about but 1200mm!
    You wouldnt be able to snap a couple of pictures would you?

    Stuart

  3. #3
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    Feb 2009
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    moonbi nsw Aus
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    Default

    Here is the photo of the drillpress in question
    Just do it!

    Kind regards Rod

  4. #4
    Join Date
    Feb 2008
    Location
    Peakhurst
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    66
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    84

    Default

    Hi,

    Put a piece of reo rod in then fill with concrete. Biggest diameter you can get hold of. Shouldn't flex after that but, it is going to be heavy.
    Steve

    Live while you're alive and sleep when you're dead

  5. #5
    Join Date
    Feb 2009
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    moonbi nsw Aus
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    Default

    Thanks Steve. We are thinking alike here. Weight is not a problem. As you can see in the picture I have bolted it to a slab to give stability and to raise it up to a more comfortable working height. More weight would help with any vibration as well. It will stay put where ever it is stuck
    Just do it!

    Kind regards Rod

  6. #6
    Join Date
    Jun 2007
    Location
    Ipswich QLD
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    68
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    1,996

    Default

    Nice to see your back in the shed

    Interesting gizmo back left green thing is that a folder Rod

    Time to clean up that router sled

  7. #7
    Join Date
    May 2010
    Location
    Lower Lakes SA
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    58
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    2,607

    Default

    Shrinkage and corrosion would be my concerns.

  8. #8
    Join Date
    Oct 2008
    Location
    Cairns, Q
    Posts
    666

    Default

    Have a look at:

    You mill drill guys.... - The Home Shop Machinist & Machinist's Workshop Magazine's BBS

    There is a lot of discussion on using concrete and other media to stiffen up the column (and base, which also proved to be part of the problem) of a mill drill in particular, and other machinery. Some good ideas and comments there.

    Frank.

  9. #9
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
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    72
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    3,102

    Default

    How expensive would it be to replace the column with a solid round bar of bright mild steel?
    That's what my Servian floor drill press has - no chance of flexing in that one....
    Joe

  10. #10
    Join Date
    Aug 2010
    Location
    Glenbrook NSW Australia
    Posts
    125

    Default

    The biggest problem with standed concrete is the shrinkage. If the mix is not touching the walls it will let the pipe bend.
    You can get no shrink concrete, even a expanding mix. The other way is a epoxy and gravel. This will work extra good as the epoxy stick to the inside of the pipe and does not shrink.
    I made a mill head using road base and epoxy, never looked back.

    Russell
    vapourforge.com

  11. #11
    Join Date
    Nov 2008
    Location
    Perth WA
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    71
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    6,458

    Default

    Quote Originally Posted by jhovel View Post
    How expensive would it be to replace the column with a solid round bar of bright mild steel?
    That's what my Servian floor drill press has - no chance of flexing in that one....
    Joe
    As I did on my Tough. The original column was battle scarred and rusty. I paid about a hundred bucks for a metre or so of precision ground 4140. Given the initial outlay of fifty for the drill I didn't think the cost was too high to preserve a bit of local tool history.

    BT

  12. #12
    Join Date
    Jan 2004
    Location
    Mackay North Qld
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    6,446

    Default

    Australian Specialty Metals or one of the steel houses can get you some suitable tube. Note, Tube! It will be more rigid if it has a suitable heavy wall
    say 20mm for a 60mm Od.

    It can be had in metric and Imperial sizes.If you want it already chromed they have that too! though be warned its not too thick only a few thou.
    I bought it in on a constant basis,when I was a quoter.
    Ring around for price and availablity.

    cheers
    Grahame

  13. #13
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    Jul 2010
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    Melbourne
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    Default

    Quote Originally Posted by Grahame Collins View Post
    Note, Tube! It will be more rigid if it has a suitable heavy wall say 20mm for a 60mm Od.
    Hi Grahame,
    Care to explain that further?
    Sure weight for weight having pipe would be more rigid than solid but the Dia is fixed.

    Stuart

  14. #14
    Join Date
    Jan 2004
    Location
    Mackay North Qld
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    Default

    1'll correct the specs slightly.The thing is you do need a a wall thickness of at least a 1/4 of the outside diameter

    It will be more rigid because to get a deflection, the force required for deflection needs to overcome four surface faces being:
    • outside
    • inside
    • inside
    • outside
    .
    It was explained and demonstrated to me by an engineer I worked with.We made a turbine shaft/gearbox alignment tool with heavy wall tubular mounts that was way more rigid than solid round one, someone else made.The tubular sections held the dial indicators.

    it is a engineering thing and perhaps an engineer will be along shortly to explain further..

    Grahame

  15. #15
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    Jul 2010
    Location
    Melbourne
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    Default

    Hi Grahame,
    The best I've been able to come up with so far is that "when not vertical" pipe has less deflection due to its own weight(which could be handy for mounting dial indicators). But I cant find anything on pipe being more rigid than solid.

    Stuart

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