Sample Case
Balance Chamber
The valve stroke on a precision assembly is held to +/- .001”. An internal component
has flatness held to .002” across surfaces with diameters 1.050” and .720”. An automatic
unscrewing core forms extremely fine 40 threads per inch on a 1.216”I.D. in the
outer component.
Poppet
The poppet is produced with a collapsible core mold with flexing elements that collapse
inward during the initial stage of ejection to release the 1.500” and 1.374” O-ring
grooves. A circular run-out of .004” to a datum reference is held on 6 critical
diameters. Diameters of 1.562” and 1.781” are held to +/- .002”.
Regulator
A pump regulator is produced from a 3-plate mold with 5 independently controlled
unwinding core pulls to form thread details and runs fully automatic production.
Each core pull has interchangeable inserts for different thread specifications and
port size openings. The part is molded in 33% glass filled nylon. A vacuum is used
to pull air from cavities to avoid blemishes on critical sealing surfaces.
Retainer
The 10-24 UNC-2A thread on this retainer is formed with side cores below the parting
line surface and core detail, and activated during ejection with a dual purpose
cam mechanism.
Gauge
This precision assembly requires a pointer-indicator to be held to +/- 3 degrees,
the concentricity in a molded polycarbonate lens to be held to +/- .002", and a
hermetic seal of the assembly through sonic welding.
Sleeve
A sleeve is molded in 50% glass filled nylon with concentricity of four diameters
held within 0.005” to a common datum reference.
Pump Housing
Dimensions of an internal diameter and occlusion radius are held within +/- .002”
on a pump housing with a thick wall section.
