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  1. #1
    Join Date
    Jan 2022
    Location
    Netherlands
    Posts
    3

    Question Polishing inside tube

    Hi all,

    I want to polish the inside of some SS tubes using a sand flapper wheel.
    To properly reach inside the tubes I would need an extension for the
    sanding wheel, however I can't seem to find any suitable parts online.

    There are some drill bit extensions available, like this: https://tinyurl.com/2p8knz5a .
    They are mostly 300mm long and cost approx. 10 bucks so that would be OK, except they
    have a female hex opening at the end while the sanding wheels are usually
    mounted on a round rod, which means that when mounted in the extension
    bit they would not be centered.

    Does anyone happen to know of a simple way or other part which could
    help me solve this problem? Thanks in advance.

    Cheers

  2. #2
    Join Date
    May 2018
    Location
    Brisbane
    Posts
    12

    Default Polishing inside tube

    I do that with a length of dowel of suitable dimensions. Cut a slit in one end fit a strip of wet and dry of suitable grit wrap a bit of tie wire round the end of the dowel to hold it together and chuck it and polish away.

  3. #3
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    I do similar with dowel or just a piece of steel rod.
    I’ve never had to tie the end - as long as you put center of the piece of emery cloth or sandpaper in the slot, wrap it around and keep it turning while you remove it it stays wrapped tightly into the slot.
    Scotchbrite works well like this too.

    Steve

  4. #4
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    What diameter are we talking about?

    RE: Using Dowel.
    I did this with some Al tubing that was ~40 mm in diameter and up to 400mm long (yes it was a wind chime ) using a length of 25mm dowel onto which I turned a reduced (13mm) shank . Instead of using a slot I drilled about a dozen 10 mm holes at right angles to each other and rolled up some steel wool into 150mm long tapered cylinders and poked these through the holes so there were tapered hanks of steel wool hanging out each side of the holes. I then put the reduced shank into a floor standing DP and did the obvious thing with the tubes with the dowel at about 100 rpm. I made up three dowels - one with medium steel wool, one with super fine wool, and one with cotton rags coated in some buffing polish - came up a treat.

  5. #5
    Join Date
    Jan 2022
    Location
    Netherlands
    Posts
    3

    Default

    Thanks for the replies guys, I think I might try the dowel method, it sounds like it
    might be good enough for what I need done.

    @BobL: the tubes in this case are in the 25-100 mm diameter range, length about 200 mm.

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

    Default

    Hi uj33,
    Welcome to the MetalWork Forums
    We have great bunch here very helpful and supportive of one another. You will find many like minded folk here, perhaps with same interests as you.

    If you explore our pages you will find bits and pieces of interesting things all over the place.

    Go to the FORUM box at top LH corner and click on it.

    A drop down menu appears and you can select Forum Home at the top of the drop down menu list. Scan down the pages to look at what we have.

    Please make an effort to read the Terms of Use -our Rules - pretty standard for many forums these days.By joining the forum its automatic that they apply to you as a member.
    Not having read the the TOUs won't be of help if a rule is infringed.

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    Its anti spam thing.

    There are all sorts of forums that might be parallel with your interests, found as described above.

    If any questions contact me via PM and I'll try to help you.

    Grahame

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