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Centerless grinding valve stem

Centerless Grinding – Valve Stem

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Centerless grinding valve stems is an application that presents the most daunting challenges to any abrasive manufac­turer. The range of requirements and priorities of this application varies from product to product, which calls for an equally wide range of offerings to suit the same. Since in most of the centerless applications, more than one wheel is mounted on the spindle, extremely tight tolerances need to be maintained in the geometry and densities of the wheels to ensure uniform wear patterns even if each wheel in the set is different. CUMI has the expertise when it comes to centerless applications thanks to the advanced manufacturing process, premium abrasive grains, and specially designed vitrified, resin, and rubber bond systems to suit the application needs. Customized solu­tions are provided for every application and specific requirement. Be it through-feed, end-feed, or in-feed, CUMI wheels ensure that components are finished to stringent quality requirements.
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Brand: CUMI

Information Material:

Product Catalogue
Type Operation Speed Good Better Best
Mono Valve
(Inlet Valve) 		Rough 35 A463 M3 V2018 A463 P5 V2020 9A463 M3 V887
50 A463 M3 V2018/50 A463 P5 V2020/50 9A463 M3 V887/50
Semi Finish 35 A60 L5 V2016 DA60 V2016 9A60 L5 V887
50 A60 L5 V2016/50 DA60 V2016/50 9A60 L5 V887/50
Finish 35 A100 J5 V10C DA100 J5 V2016 9A100 S5 V887
50 A100 J5 V10C/50 DA100 J5 V2016/50 9A100 S5 V887/50
Bi – Metal
(Exhaust Valve) 		Rough 35 - - 9A463 M3 V887
50 9A463 M3 V887/50
Semi Finish 35 - - 9A60 L5 V887
50 9A60 L5 V887/50
Finish 35 - - 9A100 J5 V887
50 9A100 J5 V887/50
CUMI Code Grit Range Diameter Thickness Hardness Structure Speed
(mm) (Inch) (mm) (Inch) (mps)
CUMISA 46 - 120 350 - 610 14 - 24 100 - 250 4 - 10 I - N 6 & 8 35, 50 & 63
50A / 50MA 46 - 120 I - N 7 35 & 50
65A 80 - 220 L - 40
SA 46 - 120 I - N 5 - 7 35 & 50
9A 46 - 120 I - P 5 - 7 35 & 50
SBA 46 - 120 I - P 5 - 7 35 & 50
AA 46 - 120 I - P 5 - 7 35 & 50
DA 46 - 120 100 - 300 4 - 12 I - P 5 - 7 35 & 50
A 46 - 120 I - P 5 - 7 35 & 50
C 46 - 120 I - N 5 - 7 35 & 50
GC 46 - 120 I - N 5 - 7 35 & 50

Product Uses

Industries
Auto/Auto Ancillary
Applications
Centreless
Product Description

Centerless Grinding Wheels for Valve Stem Grinding

CUMI centerless grinding wheels for valve stem grinding are engineered to handle one of the most demanding automotive grinding applications. Designed for setups where multiple wheels operate on a single spindle, these wheels are manufactured with extremely tight control over geometry and density to ensure uniform wear and stable grinding performance.

Using premium abrasive grains and advanced manufacturing processes, CUMI offers vitrified, resin, and rubber bond systems tailored to specific valve stem grinding requirements. Each wheel can be custom-engineered based on the grinding method—through-feed, end-feed, or in-feed—and the material and finish requirements of the component.

As a result, manufacturers achieve the following:

  • Consistent dimensional accuracy across high-volume automotive valve stem grinding
  • Uniform wheel wear even when different wheels are used in the same set
    Improved surface finish and process stability
  • Reduced rejections and downtime
  • Reliable performance from valve stem grinding tools in continuous production environments
    CUMI’s customized centerless grinding solutions ensure automotive valve stems are finished to stringent quality standards, delivering precision, productivity, and process confidence.

Industry: Auto / Auto-Ancillary (Valve / Engine component manufacturing)

FAQs
01.
Which industry uses this wheel? It is mainly used in Automotive & Auto-Ancillary valve stem and engine component manufacturing.
02.
Why is cool grinding important on valve stems? Heat can damage metallurgy — cool cutting ensures component strength for engine compression.
03.
Which grinding methods are supported for valve stem grinding? CUMI centerless grinding wheels are suitable for through-feed, end-feed, and in-feed grinding methods, depending on the valve stem design and production requirements.
04.
What bond systems are available for valve stem grinding wheels? UMI offers vitrified, resin, and rubber bond systems, each selected based on material type, surface finish requirements, and production conditions.
05.
Are CUMI valve stem grinding wheels customizable? Yes. CUMI provides customized centerless grinding solutions tailored to specific valve stem materials, tolerances, wheel combinations, and automotive quality standards.

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CUMI, a part of the 124-year-old Murugappa Group, began as an abrasives company in 1954.

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