D-K Manufacturing Corporation
NTSA Precision

CNC Machined Contact Sleeve for the Compressor Industry

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Contact Sleeve
Contact Sleeve
Contact Sleeve

A customer contracted D-K Manufacturing Corporation to produce twenty five contact sleeves to be used in a compressor seal application. Employing a combination of our craftsmanship and services, we were able to successfully manufacture these parts within a short lead time of 12 days.

Using an automatic horizontal Doall Saw to cut each sleeve from seamless HRS tubing. We then employed our Methods Slant3 CNC lathe to turn each unit, leaving .005 inches of extra material behind for later grinding operations. Additionally, we turned the inner diameter of the contact sleeves in order for the parts to have a snug fit on a grinding arbor. Parts are then sent out to our heat treaters for stress relief.

After each contact sleeve was turned and stress relieved, we then use our Fadal 4020 VMC equipped with a 4th axis to vertically mill a series of thirty six equally spaced slots near the front rim of each unit. We also cut a slot entirely through the top towards the back of each sleeve. During these machining processes, we were able to uphold a concentricity tolerance of .0005 inches TIR, which is key to establishing finish tolerance of parallelism and perpendicularity tolerance of .001 inches, and a flatness tolerance of .000011 inches.

Next, we had to ensure that the contact sleeves possessed an ultra-smooth, 4 RMS finish. In order to provide this finish to each part, we employed a combination of our grinding, plating, and lapping technology. Using our Heald rotary grinder to finish the sleeves' faces and our TOS cylindrical grinder for both the inner and outer diameter of each unit, we then proceeded to flame plate the sleeves, providing each part with a carbide coating measuring anywhere between .004-.008 inches in thickness. After the sleeves were plated, we utilize our Speedfam lapping machine to provide the final finish to each unit.

After manufacturing was complete, we performed a series of quality control inspections using a variety of bore gages, CMM, profilometers, and optical flat equipment, ensuring that each contact sleeve met precise client specifications. Basing our design off of a customer supplied print, we constructed each sleeve to measure 5.25 inches in outer diameter by 3.5 inches in inner diameter. The flange on the sleeve possessed a maximum outer diameter of 4.9375 inches.

By combining our craftsmanship and years of knowledge a long with our outstanding supplier services we were able to construct this series of contact sleeves for our customer, we were able to produce superior product that met precise client specifications. Within a twelve day lead time, all twenty five parts were successfully manufactured and shipped to our customer.



Project Highlights:

Product Description
  • This Contact sleeve is used in a Compressor seal application
Capabilities Applied/Processes
  • Stress Relieving
  • CNC Turning
  • CNC Milling
  • Grinding
  • Deburring
  • Plating
  • Lapping
Equipment Used to Manufacture Part
  • Doall Saw
  • Methods Slant3 CNC Lathe
  • Fadal 4020 VMC
  • Heald Rotary Grinder
  • TOS Cylidrical Grinder
  • Speedfam Lapping Machine
Overall Part Dimensions
  • Stock: 5.25" O.D. x 3.50" I.D.
  • O.A.L.: 2.6875"
  • Max O.D.: 4.9375"
Tightest Tolerances
  • Concentricity of .0005"  TIR (Total Indicator Reading)
  • Parallelism of .001"
  • Perpendicularity of .001"
  • Flatness of .000011
Material Used
  • Seamless HRS Tubing
Max Material Finish
  • 4 RMS
Typical Operations
  • CNC Turning:
  • Turn Leaving .005" Per Side For Grinding Op.
  • 1/64 x 45¢ª Chamfer on O.D.
  • 1/32 x 45¢ª Chamfer on I.D.
  • .03" Dp. Undercut x .250" Wide, R .01225"
  • .076" Dp. Undercut x .1225" Wide, R .010"
  • Turn I.D. For Snug Fit on Arbor
  • Vertical Milling:
  • Mill 36 Slots Equally Spaced
  • 2" Slot Cutter x .250" Thick
  • Mill 1 Slot Thru
  • .3125" Wide
  • .5625" Long
  • Rotary Grinding:
  • Finish Faces
  • Cylindrical Grinding:
  • Finish O.D.
  • Finish I.D.
  • Plating:
  • Flame Plating
  • .004"-.008" Thick
  • Lapping
  • Plated Surface Must Be Optically Flat Within 1 Light Band
In process testing performed
  • Inspection: SPC
  • Bore Gages
  • CMM
  • Profilometer & Optical Flat
Industry for Use
  • HVAC
Delivery Time
  • 8 Weeks
  • 25
Delivery Location
  • El Paso, Texas
Standards Met
  • Customer supplied print, 2D Auto CAD Drawing
Product Name
  • Contact Sleeve

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