Needlegun scaler


Needlegun scaler
A U.S. Navy Seaman uses a needle-gun to remove old paint and corrosion aboard USS Kitty Hawk.[1]

A needlegun scaler or needle-gun is a tool used in metalwork applications as diverse as home repair, automotive repair and shipboard preservation.[2][3][4] The tool is used to remove rust, mill scale, and old paint from metal surfaces.[5]

Contents

Operation and use

A needle gun has a set of very fine chisels known as needles.[2] The tool forces these needles against a work surface at variable speeds up to around 5,000 times per minute.[2][5] Different models offer choices of number of needles, operating speed, and power levels.[2] Many models use compressed air, although electrical needle-guns do exist.[2][6]

In a pneumatic unit, compressed air forces a piston forwards and backwards.[2] This movement causes the needles to move back and forth against the work surface.[2]

An able seaman uses a needlegun to remove scale while refurbishing a mooring winch.

The needle gun has advantages over other scaling tools. Its main advantage is that the needles automatically adjust themselves to contours, making the tool a good choice for cleaning irregular surfaces.[5] A needle gun can clean an area to bare metal in seconds, and compares well to other scaling tools in terms of accuracy and precision.[2]

It is recommended that before needlegunning, a surface be prepared by removing oil, grease, dirt, chemicals and water-soluble contaminants.[4] This can be done with solvents or with a combination of detergent and fresh water.[4]

Then, the needle gun is used to remove rust, loose scale, and paint, leaving bare metal.[4] It is used most effectively by holding it at a 90° angle to the work surface.[4] It is recommended that an area no larger than six to eight inches be cleared at once.[4] Two to three passes over an area is generally sufficient to clean it.[4] Then the process is repeated until the desired area is completed.[4]

Prior to painting, it is desirable to feather any edges between metal and old paint.[4] It is also important to check the surface for oil deposited during chipping, and if necessary, clean the area with solvents.[4] Since bare metal surfaces will flash rust soon after exposure to the atmosphere, paint should be applied as soon as possible after chipping.[4] If flash rusting occurs prior to coating, further chipping, cleaning and sanding may be necessary.[4]

See also

Yacht foresail.svg Nautical portal

Notes

  1. ^ U.S. Navy, 2006.
  2. ^ a b c d e f g h Miller, 2008.
  3. ^ Park, 1984.
  4. ^ a b c d e f g h i j k l NAVSEA, 2008.
  5. ^ a b c NETC, 2003, p. 11-10.
  6. ^ Nitto Kohki, 2008.

References

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Micrometer — This article is about the measuring device. For the unit of length, see Micrometre. Outside, inside, and depth micrometers A micrometer (   …   Wikipedia

  • Ruler — For other uses, see Ruler (disambiguation). A variety of rulers A 2 meter …   Wikipedia

  • Chisel — This article is about the tool. For the American band, see Chisel (band). For the album by Australian band Cold Chisel, see Chisel (album). Steel woodworking chisel …   Wikipedia

  • Saw — For other uses, see Saw (disambiguation). Saw A crosscut hand saw about 620 mm (24 inches) long Classification Cutting Types Hand saw Back saw Bow saw Circular saw …   Wikipedia

  • Wrench — For other uses, see Wrench (disambiguation). A set of chrome vanadium metric wrenches, open at one end, box/ring at the other. This type is commonly known as a combination wrench. A wrench or spanner is a tool used to provide grip and mechanical… …   Wikipedia

  • Tape measure — plastic tape measure (metric) Self retracting tape measure (imperial) …   Wikipedia

  • Pliers — For the Jamaican singer, see Pliers (singer). Flat nose pliers Pliers are a hand tool used to hold objects firmly, for bending, or physical compression. Generally, pliers consist of a pair of metal first class levers joined at a fulcrum pos …   Wikipedia

  • Combination square — with standard head A Combination Square consisting of the rul …   Wikipedia

  • Miter saw — A miter saw (also spelled mitre) is a saw used to make accurate crosscuts and miters in a workpiece. Contents 1 Manual miter saw 2 Power miter saw 2.1 Types 2.2 F …   Wikipedia

  • Caliper — For other uses, see Caliper (disambiguation). A vernier caliper …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.