Internal and External Burnishing Exceeds Finish Requirements
Roll-a-Finish® Tool and CX®Machine achieve better than required surface finishes on computer printer components
A MANUFACTURER OF COMPUTER PRINTERS applied Cogsdill roller burnishing tools and machines to achieve finish requirements on both internal and external surfaces:
1. A nylon slide bushing was causing scratches on the surface of a printer shaft and
would not slide freely across the surface of the rod. The I.D. of the bushing was
burnished with a Cogsdill Roll-a-FinishTool. Due to the ultra-smooth finish
obtained by burnishing, the slide bushing slid freely across the rod surface and was
scratch-free.
2. The customer also wanted a super-low surface finish (2 microinch Ra or better) on the printer shaft. We recommended a Cogsdill CX-1T External Roller Burnishing
Machine equipped with an interference through-feed sub-assembly suitable for sizing
and finishing shafts such as this one. After the first pass, the finish was very good but not quite up to the demanding specification. A second pass through the CX-1T
produced a surface finish that was reported as shiny beyond belief!
Machining data for application 1:
Machine type: Speed lathe
Tool type: R-250 Roll-A-Finish
Component: Slide bushing
Material type: Nylon
Spindle speed: 1000 RPM
Feed rate: .012 IPR (.31 mm/rev.)
Cycle time: 5 to 7 seconds
Coolant: WD-40
Finish required: Under 12 microinches (0.3 micrometer) Ra
Finish achieved: 8-10
Machining data for application 2:
Machine type: CX-1T-A
Component: Printer shaft
Material type: Stainless steel
Spindle speed: 1200 RPM
Feed rate: .094 IPR (2.39 mm/rev.)
Cycle time: 8 to10 seconds
Coolant: Thin spindle oil
Size required: .250 in. +.000 −.001 (6.35 mm +.000 -.025)
Size achieved: .2495 in. (6.34 mm)
Finish required: 2 microinches (0.05 micrometer) Ra or better
Finish achieved: As required
Cogsdill Tool Products offers a wide array of standard tooling and a broad range of solutions for burnishing including: Standard Roll-a-Finish tools for IDs and ODs; Special designs for tapers, faces and contours; Single-roll and diamond tools for ODs, large IDs, faces, tapers, contours, and irregular surfaces; CX external burnishing machines for shafts or cylindrical surfaces of any length. Parts are sized, finished, and work-hardened in seconds! Refer to our catalog no. 500, Burnishing Tools and Machines, for more information.
In 1914 Stuart A. Cogsdill set up shop in Detroit as a cutting tool regrinding and repair service. He soon began designing and manufacturing special tools for early automotive pioneers such as Henry Ford and the Dodge brothers. Today Cogsdill Tool still offers its 21st century customers the same commitment that inspired its founder: We will develop and build innovative tooling solutions for your tough manufacturing problems. Cogsdill has two operating units, one in the United States and one in the United Kingdom:
Company Information:
Name: Cogsdill Tool Products, Inc.
Address: P.O. Box 7007-TR
City: Camden
State: SC
ZIP: 29020 7007
Country: USA
Phone: 803-438-4000
FAX: 803-438-5263
http://www.cogsdill.com
