160 BOND ST.
ELK GROVE VILLAGE, IL 60007
Thin Wall, Close Tolerance Machining
CGR - Machining Group specializes in close tolerance machining to 50 millionths of an inch (.0013mm) on customer-designed parts that require tightly controlled dimensional and geometric tolerances – such as flatness, perpendicularity, roundness, run-out, parallelism, etc. – when measured in the “Free State” (unrestrained). We are particularly good at parts with thin wall sections that need these tight free state requirements.
Difficult To Machine Materials
Stainless Steels (440C, 410, 416, 347, 316, 304, 17-4, 15-5, and 13-8, A286)
Inconel, Invar™, AM355 and Kovar
Alloy Steel, CPM10V, Tool Steel
Manganese Bronze & Brass
6061 and 7075 Aluminum
Hard Turning, Grinding, Lapping
Because these operations generally are near the end of the manufacturing process, lack of quality control could be costly in terms of money and time lost. CGR - Machining Group, unlike many of our competition who farm out their grinding to outside suppliers, does all of our own grinding, honing, and lapping in house.
CGR - Machining Group does hard turning on applications when the process is more cost effective than traditional grinding.
Critical Surface Finish Applications
CGR - Machining Group has the knowledge, experience and equipment to produce micro finishes as fine as 2 micro inches with flatness to 2 helium light bands.
We do super finishing of diameters, bores, shoulders and faces of parts that require demanding critical sealing and mating surfaces.
We also do “Match Grinding” of metering components, such as high performance valves, spools and sleeves that require specific diametrical clearances.
Materials: Nitralloy, 440C, M2, M50
Sizes: Up to Ø11”
Hard turned ID, OD, & o-ring grooves within 16 ra & +/-.001
Ground ID, OD, & o-ring grooves within 6ra & +/-.0002
Surface ground within .0002 parallel
Parallel & flat within .0002-.0005
Minimum flow rate (151 cc/minute min. at 5 psid)
Maximum flow rate (454 cc/minute max at 30 psid)
Actuation pressure, Closing (30.0 to 33.0 psid)
Valve leakage (5 cc/minute max at 33 psid)
Actuation pressure, opening (27 psid min.)
Lapped flat within 2 HLB or 3 HLB
Parallel to opposite mating surfaces within .0002
Polished flat with 2 Ra or 4 Ra
Scratch free under 1X mag
C355 T71 Aluminum Casting
Anodized & Dyed Red
Thin walled stainless steel seal housing
0.0005" OD Cylindricity
0.0005" inner sealing face flatness
0.0005" sealing face squareness to OD
Material: Inconel 718
Dimensions: Ø0.57" x 2.4” Long
0.075" Wide Face Groove at 30°
Several Ø+/-0.0005" Turned Features
0.002" Max Break Weld Lip edges
Ø0.063" Thru Center Hole
Material: 304 SS bar stock
Total profile within 0.010"
Ø.190 holes positioned within .005 of each other
Material: Inconel 718
Dimensions: Ø.9 x 3”L
8-32 port threads
Ø.0942+/-.0002 port hole
No step face undercuts @ +/-Ø.001
Ø.125 thru hole
440C Housings and Pistons
Turned and milled pre heat treat
Hardened to 60 HRC
Ground within +/- Ø.0001, .0002 concentricity,8-16 Ra finish
Matched within .0001-.0003 diametrical clearance
13 - 13
We Accept all Major Credit Cards