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Cutting hypodermic needles without squashing them

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  • Member since
    March 2005
  • From: West Virginia, USA
Cutting hypodermic needles without squashing them
Posted by mfsob on Saturday, July 16, 2011 7:32 AM

In yet another case of AMD, I've been looking at my current project, a 1/72 A6M2-N Rufe, and thinking it would look really cool to put a couple of pieces of hypodermic needle tubing inside the holes for the wing cannons for a more three-dimensional look.

Hypodermic tubing is strong stuff (it has to be!). I have to use my Xuron photoetch shears to get a smooth straight-edged cut, but that also results in a flattened "oval" shaped tube end that is quite noticeable. I've tried rounding it back out by shoving a pointed straight pin inside the opening with limited success. Anyone cut this stuff another way that doesn't result in it getting squashed in the process? 

  • Member since
    February 2003
  • From: Central Ohio
Posted by Ashley on Saturday, July 16, 2011 8:14 AM

Sure! I use an abrasive cut-off wheel in my Dremel. You do have to dress the cut end with needle files, but the wheel doesn't deform the tubing as a shear would.

Have you flown a Ford lately?

  • Member since
    June 2009
  • From: Metepec, Mexico
Posted by Electric Blues on Saturday, July 16, 2011 10:19 AM

I hold the needle over a flame until it all glows red.

Once cooled again, it's much more pliable and easily cut, rolling it under a #11 blade.

  • Member since
    February 2010
  • From: Ontario, Canada
Posted by Bockscar on Saturday, July 16, 2011 3:28 PM

Those are great ideas.

Cutting a new needle must play havoc with the Xuron tool...

  • Member since
    March 2005
  • From: West Virginia, USA
Posted by mfsob on Sunday, July 17, 2011 7:15 AM

Duhhhhh ... annealing! Bang Head

  • Member since
    September 2007
  • From: Truro Nova Scotia, Canada
Posted by SuppressionFire on Sunday, July 17, 2011 7:17 AM

Ashley

Sure! I use an abrasive cut-off wheel in my Dremel. You do have to dress the cut end with needle files, but the wheel doesn't deform the tubing as a shear would.

Ditto

 

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fox
  • Member since
    January 2007
  • From: Narvon, Pa.
Posted by fox on Sunday, July 17, 2011 2:02 PM

I used to use the dremel cut-off wheel until I discovered the jewelers saw with a very fine blade. You will still have to dress the edges with a fine file.

Jim Captain

 Main WIP: 

   On the Bench: Artesania Latina  (aka) Artists in the Latrine 1/75 Bluenose II

I keep hitting "escape", but I'm still here.

  • Member since
    April 2005
  • From: Piscataway, NJ!
Posted by wing_nut on Sunday, July 17, 2011 3:02 PM

Score it with the edge of a file and it snaps like glass.

Marc  

  • Member since
    January 2003
  • From: Washington, DC
Posted by TomZ2 on Sunday, July 17, 2011 3:10 PM

Ditto I had no difficulty doing that [score, snap, & dress] to make 1:144 Sherman hull MGs.

Occasional factual, grammatical, or spelling variations are inherent to this thesis and should not be considered as defects, as they enhance the individuality and character of this document.

  • Member since
    February 2010
  • From: Ontario, Canada
Posted by Bockscar on Sunday, July 17, 2011 9:57 PM

Another great way to chop needles...anyone got an industrial laser???Wink

  • Member since
    June 2008
  • From: Iowa
Posted by Hans von Hammer on Tuesday, July 19, 2011 10:22 PM

Some really good methods here.. So I'm going O/T... I prefer to use stretched Q-tip handles, with small wire inserted to keep 'em straight (they tend to curl after a few weeks if you don't).  Only need the wire if the barrels (or blast tubes, like on a P-47) are prominent...   Plus, you can vary the sizes much more easier than you can with metal.  Simply vary the amount of stretch, the same way you'd do antennas and such... 

 The other method I use is Evergreen styrene-coated wire. I cut the wire, then roll the plastic under the blade down to the metal, then slide the styrene down the wire a bit, leaving the hollow "muzzle-end" exposed.  You then apply cement and you're done, plus it's a styrene-to-styrene joint.. These are especially effective for short blast-tubes and barrels (a la F4F, P-51, Fw 190 etc.), and work well in 1/48 and 1/32-35 for both cannons and MGs, depending n the wire selected..

Far cheaper than medical sharps (and safer too, for those that are prone to actually putting their life's blood into their work.)...   Cool

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