Aperture Assembly
Due to the precision required in maintaining the concentricity of the aperture gap, and to enhance the probability of successful implementation, the two major parts that comprise an aperture are available as a pre-assembled unit.
The assembly consists of the aperture parts, an installed steam inlet tube, and an installed set screw for later mounting on the support rod. The unit is shipped with the support set screw in place to maintain factory alignment of the aperture parts. The unit is designed and characterized for operation with the recommended bell tube material of 3/16 inch K&S .014 wall brass tubing.
The center hole for the support rod is drilled to 0.0465 inch for a #20 (0.045 inch) wire support. Stainless steel is suggested due to the environment and for strength.
There is a 5/16 (0.3125) inch machining allowance on the top solid cylinder of the aperture body. This area can be modified to form a decorative final on the whistle, or removed entirely for space considerations. A recommended thickness of at least 1/16 (0.0625) inch must be maintained between the aperture housing and the end of the aperture body along the 1/4 inch diameter of the aperture body for sealing purposes.
NOTE: Due to the manufacturing process involving high heat during silver soldering, the lower outer ring of the aperture assembly (aperture housing) will be in an annealed or softened state. This means that it can be deformed by having nonsymmetrical forces placed upon it. Doing so will cause the gap to become uneven, which will affect the operation of the whistle, possibly causing the final application not to work. A fully encircling device that provides uniform holding force such as a collet is recommended for work holding if you need to secure it from the bottom or aperture housing end. Don't put it in a vise, 3-jaw, or 4-jaw check. Been there, done that, have unusable parts
BELL AND RESONATOR NOT INCLUDED.
Description
- Aperture Assembly
- Standard full length aperture assembly 3/4 (0.75) inch (19 mm) long. Plain cylinder end with no decorative machining or shortening from raw manufactured length.
- 1/2 (0.5)inch (12.5 mm) long 3/32 (.0975)inch outside diameter brass steam supply tube silver soldered to aperture housing.
- 2-56 UNC (default) (M2x0x.4 optional) stainless steel set screw installed to maintain concentricity.
- Spare screw and hex "L" wrench
Assembled
Tested
The unit is tested to ensure basic function before leaving our environment.
Finish
Clean metal (BRASS FINISH NOTE)
Production Options
Mounting Screw:
- 2-56 UNC (American) (default)
- M2x0.4 (no charge)
Price
$85.00 USD Part Number 4000124
Page Last Edited March 17, 2008