Custom Stainless Steel Fuel Nozzle Seal for Pratt & Whitney Jet Engine

Steel Fuel Nozzle Seal
Steel Fuel Nozzle Seal

Steel Fuel Nozzle Seal

Steel Fuel Nozzle Seal Half Section

Steel Fuel Nozzle Seal Half Section


This featured fuel nozzle seal is used on a Pratt & Whitney JT8D jet engine – the power plant for thousands of MD-80 and DC-9 commercial aircraft in the sky today. Our engineering staff worked with Pratt & Whitney engineers to design the critical features of this part. To manufacture the seal, a variety of CNC machining processes were applied with custom made tooling. Using a twin spindle Traub lathe with live tooling, we turned each side, with both sides requiring a dual spring diaphragm, with a .0002″ to .0005″ knife edge radius on both the I.D. and O.D periphery. The knife edges were selectively nitride coated for hardness. Four slots at 90 degrees were CNC machined into the sealer support area below the knife edges. Twelve equally spaced .123″ to .127″ holes were drilled into the face. Throughout the machining process we maintained tight tolerances of +.0002″/-004″, and a concentricity tolerance of .0005″. To conduct inspection we relied on an OGP touch probe and a vision system CMM, as well as micrometers, pin gages, a custom thread gage, a drop gage, and an optical comparator. Each seal is 100% inspected under a 20X power microscope for any visual imperfections and 100% vacuum tested for sealing.

Each part has complete identification and traceability, and was individually packed between foam in a plastic container and put into an intermediate container. We labeled each intermediate container with part and lot numbers, as well as the quantity. Included in each order was a raw material certification, complete with chemical and mechanical properties, and quality control verification. The project took 4 to 6 weeks to complete, and was then shipped to our client for use in the aerospace industry.

Specifications for Stainless Steel Fuel Nozzle Seal

Capabilities Applied/Processes CNC Machining
Inspection
Equipment Used to Manufacture Part 5-Axis Traub Lathe w/ Live tooling
OGP Touch Probe and Vision System CMM
Overall Part Dimensions 1.250″ Round Bar Stock
O.D. 1.230″
I.D .417″
Tightest Tolerances +0002″/-.004″
Concentricity of .0005″
±1°
Material Used 17-4 Stainless Steel per AMS5643
Max Material Finish 8 RMS
Typical Machining Operations CNC Machining:
Set up On Lathe
Turn:
Proprietary machiningInspection:
Inspected using:
CMM
Micrometers
Pin Gages
Custom Thread Gage
Drop Gage
Optical ComparatorPackaging:
Packaged to GMMCO StandardsPaperwork Includes:
Raw Material Certification w/ Chemical & Mechanical Properties
All paper work is Stamped with Pratt & Whitney Acceptance stamps
Packaging Slip
Estimated Part Weight ½ pound
Industry for Use Aerospace
Delivery Time 4-6 Weeks
Standards Met Customer supplied print
Product Name Fuel Nozzle Seal
Posted in Portfolio

Custom Carbon Steel Grip Plug for Aerospace Application

Carbon Steel Grip Plug
Carbon Steel Grip Plug

Carbon Steel Grip Plug

This featured grip plug is a critical aerospace part and is composed of 4140 stainless steel that was heat treated to 32-38 HRC. To manufacture the insert, a variety of CNC Swiss Turning processes were applied. Using a SR-32J Star Swiss type lathe with live tooling, we turned each side and turned the start of the lead thread to a chamfer of .06 x .45 degree with the M14 x 2.0 for the major diameter and pitch diameter, and with a thread relief having 2 radii of .060″. Next, using the machine’s y-axis capability with live tooling, we milled two .670″ wrench flats into the stem. Throughout the machining process we maintained tight tolerances of +.001″/-.005″, with features on a common axis to be GD&T run-out of .010″ max. To conduct inspection we relied on an OGP touch probe and a vision system CMM, as well as micrometers, a custom thread gage, a drop gage, and a digital optical comparator.

The final Grip Plug featured .875″ round bar stock, with a .786″ outside diameter and a thread relief diameter of .450″. We then labeled each carton with part and lot numbers, as well as the quantity. Packaging was limited to 50 parts per box, in accordance with aerospace bag and tag requirements. Included in each order was a raw material certification, complete with chemical and mechanical properties, and quality control verification. The project took 4 to 6 weeks to complete, and was then shipped to our PMA client for use in the aerospace industry.

Specifications for the Carbon Steel Grip Plug

Capabilities Applied/Processes Swiss Machining
Opposite ends of the same part can be machined simultaneously.
Inspection
Equipment Used to Manufacture Part Star SR-32J Swiss CNC Lathe w/ Live tooling
OGP Touch Probe and Vision System CMM
Overall Part Dimensions .875″ Round Bar Stock
O.D .786″
.450″ thread relief.
Tightest Tolerances +001″/-.005″
Features on a common axis to be GD&T run-out of .010″ max
Material Used 4140 Stainless Steel
Max Material Finish 63 RMS
Typical Machining Operations CNC Machining:
Set up On Lathe
Turn Side 1
Turn Side 2:  start of the lead thread to a chamfer of .06 x .45 degree with the M14 x 2.0 for the major diameter and pitch diameter, with a thread relief having 2 radius of .060″.Thread relief having 2 radii of .060″Mill wrench flats: Two .670″ wrench flats centered 180 DegreesInspection:
Inspected using:
CMM
Micrometers
Custom Thread Gage
Drop Gage
Digital Optical Comparator

Packaging:
Packaged to GMMCO Standards

Paperwork Includes:
Raw Material Certification w/ Chemical & Mechanical Properties
All paper work is Stamped w. QC Inspector Stamp
Packaging Slip

50 Parts Max. Per Box
40 Lbs Max. Per Box
Box Size 12″x10″x6″

Each carton To be Labeled w/ Part Number, Lot Number, and Quantity

Estimated Part Weight ¼ lbs
Industry for Use Aerospace
Delivery Time 4-6 Weeks
Standards Met Customer supplied print, 2D Auto CAD Drawing
Product Name Custom Grip Plug
Posted in Portfolio

Hass TL-25 Turning Center

Featuring 5-axis multi-spindle CNC turning centers with live tooling, GMMCO serves over 20 distinct industry sectors and can accommodate a diverse range of intended applications. From machining and engine components to spacers, fittings, and standoffs, we offer a production chucking capacity ranging from 0.500″ to 5″.  Our facility also features secondary live tooled milling operations with a 6″ by 6″ by 6″ work envelope, and offer a wide variety of machining processes and materials. We are ISO and AS certified and are proud to uphold the highest quality standards to better serve our clients.

Examples of Our Work

CNC Turning Specifications

Industries Served Aerospace
Agricultural
ArchitecturalAutomotive
Chemical
Dental
Electronic
Food / Restaurant
Machine Tool
Marine
Medical
Military
MRO (Maintenance Repair Overhaul)
Oil and Gas
Optical
Packaging/Converting
Pharmaceutical
PMA (Parts Manufacturing Approval)
Applications Machine components
Engine components
Turbine components
Hydraulic components
Turbomachinery components
Construction equipment
Shafts
Forgings
Jewelry
Valves
Pins
Thread rod
Fasteners
Spindles
Sockets
Bushings
Spacers
Fittings
Standoffs
Tolerances Straightness: ± 0.001
Concentricity: ± 0.001
Diameter (outer/inner): ± 0.001 in
Length (over _ in): ± 0.001 in
Part Diameter
Min
0.500 in
Max
5 in
Part Length
Min Max
6 in
Machining Processes Parting/Cutting
Facing
Turning:

  • Contour Turning
  • Form Turning
  • Taper Turning
  • Straight Turning

Threading

  • External
  • Internal

Internal Forming
Knurling
Boring
Drilling
Counter-boring
Countersinking
Pocketing
Profiling
Reaming
Tapping
Thread Milling

Materials (Metals) Alloy Steels
Aluminum
Brass
Bronze Alloys
Carbon Steel
Copper
Iron
Nickel
Stainless Steel
Standard Steel
Titanium
Zinc
Equipment See our Equipment List for a complete and comprehensive guide of GMMCO’s machinery and equipment capacities
Fixtures Three-jaw chuck
Microcentric Precision Collets
In-House Fixturing & Tooling
Equipment Capabilities CNC Control Capabilities
Bar Feed
Reverse Engineering
Machinery Axis 5 Axis Turning

Y-Axis Machining

Live Tooling

Secondary Services Offered Drilling
Deep hole Drilling
Tapping
Bending
Threading
Rotary Broaching
Counter Sinking
Pressing
Milling

  • 6X6X6″ Work Envelope With Live Tooling

Reaming

Advantages of Turning Tight tolerances
Short lead times
Wide range of compatible materials
Production Volume
Min
25 Units
Max
10,000 Units

Specialty Production Shop
Low Volume
Small Run
Long Run

Lead Times Available Quoted on job by job basis
Emergency services available
Rush Services Available
Industry Standards AS – 9100
Aerospace Industry Standard
ISO – 9001-2015
International Organization for Standardization
File Formats SolidWorks (SLDPRT,SLDDRW,SLDDRT)
Part Maker Cad/Cam
Posted in Capabilities

Custom Stainless Steel Insert Orifice for an Oil and Gas Safety Relief Valve

Stainless Steel Insert Orifice Part
Stainless Steel Insert Orifice Part

Stainless Steel Insert Orifice Part

Stainless Steel Insert Orifice Drawing

Stainless Steel Insert Orifice Drawing


This featured insert orifice is used in natural gas extractions, and is composed of 316 stainless steel. To manufacture the insert, a variety of CNC machining processes were applied. Using a Haas CNC lathe with live tooling, we turned each side, with the second side requiring a 1/2″ precision radius on top of a 15 degree lead-in angle. Next, we milled 4 slots 90 degrees apart, with .125″ in depth through 2 7/8″-16 UN-2A threads. Throughout the machining process we maintained tight tolerances of +.000″/-.005″, and a concentricity tolerance of .004″. To conduct inspection we relied on an OGP touch probe and a vision system CMM, as well as micrometers, pin gages, a custom thread gage, a drop gage, and an optical comparator.

The final insert orifice featured 3.00″ round bar stock, with a 2.750″ outside diameter and a 2.020″ to 2.5625″ inside diameter. Each of 4 slots measured 2.188″ wide, and the total insert weighed 1/2 lb. We then labeled each carton with part and lot numbers, as well as the quantity. Packaging was limited to 60 parts per box, with each box weighing a maximum of 40 lbs. Included in each order was a raw material certification, complete with chemical and mechanical properties, and quality control verification. The project took 4 to 6 weeks to complete, and was then shipped to our client for use in the oil and gas industry.

Specifications for the Custom Stainless Steel Insert Orifice

Capabilities Applied/Processes CNC Machining
Inspection
Equipment Used to Manufacture Part Haas CNC Lathe w/ Live tooling
OGP Touch Probe and Vision System CMM
Overall Part Dimensions 3.00″ Round Bar Stock
O.D. ø2.750″
I.D. ø2.020″-2.5625″
2 7/8-16 UN-2A Thread
Four 2.188″ Wide Slots
Tightest Tolerances +000″/-.005″
Concentricity of .004″
±1°
Material Used 316 Stainless Steel per ASTM A479
Max Material Finish 63 RMS
Typical Machining Operations CNC Machining:
Set up On Lathe
Turn Side 1
Turn Side 2: Precision ½” Radius on top of a 15 Degree Lead in Angle
Mill Slots: 4 Slots Spaced 90 Degrees at .125″ Deep Through 2 7/8″-16 UN-2A ThreadsInspection:
Inspected using:
CMM
Micrometers
Pin Gages
Custom Thread Gage
Drop Gage
Optical ComparatorPackaging:
Packaged to GMMCO Standards

Paperwork Includes:
Raw Material Certification w/ Chemical & Mechanical Properties
All paper work is Stamped w. QC Inspector Stamp
Packaging Slip
60 Parts Max. Per Box
40 Lbs Max. Per Box
Box Size 12″x10″x6″
Each carton To be Labeled w/ Part Number, Lot Number, and Quantity

Estimated Part Weight ½ pound
Industry for Use Oil and Gas
Delivery Time 4-6 Weeks
Standards Met Customer supplied print, 2D Auto CAD Drawing
Product Name Custom Insert Orifice
Posted in Portfolio