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Thread: How Do I Do This?

  1. #1
    Join Date
    Apr 2006
    Location
    Chicago Area
    Posts
    55

    Default How Do I Do This?

    I could use some advice from folks with more experience than I have.

    I have sawed off the top of a propane tank (picture a metal cup about a foot in diameter and a foot high), and now I want to clean up the sawed edge.

    As you might expect, the rim of this "cup" is pretty limber, even with the base firmly clamped to the table of the milling machine. It tends to shimmy and ring when the cutter bites in (scary AND deafening). Regular side-cutting end mills do NOT seem to be the tool for this job. A slitting saw does somewhat better, but it still doesn't seem to be what the job calls for.

    I've tried clamping mass to the rim and cross-bracing the open end of the cup without much noticeable improvement in the situation. I've thought about filling the thing with sand to try and damp out some of the vibration.

    Any ideas on how to approach this job? Thanks in advance.

  2. #2
    Join Date
    May 2005
    Location
    Milwaukee
    Posts
    1,078

    Default

    Angle grinder/sander and a sharp file....

  3. #3
    Join Date
    Jan 2002
    Location
    Huntsville Ala
    Posts
    5,790

    Default

    I'd opt for the file. Quieter and more peaceful, and therapeutic to boot.

  4. #4
    Join Date
    Jul 2004
    Location
    Tarkio,Mo.
    Posts
    331

    Default

    How about sawing a hole in some plywood slightly smaller than the tank. Sand the hole until you can force it on tank. This should make the wall of tank rigid enough to use a hand grinder.
    Gary Davison

  5. #5
    Join Date
    Aug 2002
    Posts
    8,946

    Default

    I had a friend do exactly this with angle grinder with grinding disc then angle grinder fitted with flap discs.Alistair
    Please excuse my typing as I have a form of parkinsons disease

  6. #6
    Join Date
    Feb 2005
    Posts
    246

    Default

    Don't know what your tolerance or final application is, but the angle grinder will work with a sanding disk, or if you need greater accuracy the sand will work.

  7. #7
    Join Date
    Oct 2004
    Location
    Prestatyn, North-Wales
    Posts
    6,061

    Default

    fill the thing full of wet sand

    all the best..mark

  8. #8
    Join Date
    Apr 2006
    Location
    Chicago Area
    Posts
    55

    Default The Sand Did the Trick

    For the benefit of anyone else who tackles this same problem, packing the thing with sand really did the trick! The job ran so smoothly and quietly that you would have thought I knew what I was doing :-)

    Thanks to all who replied. I'm sure the grinder would have worked too if I were less retentive (my problem, not yours).

    Thanks again.

  9. #9
    Join Date
    Dec 2005
    Posts
    4,442

    Default

    Aboard said the same thing I was going to say.. Dampen it with sand mass.
    Excuse me, I farted.

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