Centerless Grinding – Valve Stem

Name: Centerless Grinding - Valve Stem
Brand: CUMI Abrasives
SKU: CGW-VS-001
Author: CUMI Abrasive Team

Good

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.

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
	Rough	50	A463 M3 V2018/50	A463 P5 V2020/50	9A463 M3 V887/50
	Semi Finish	35	A60 L5 V2016	DA60 V2016	9A60 L5 V887
	Semi Finish	50	A60 L5 V2016/50	DA60 V2016/50	9A60 L5 V887/50
	Finish	35	A100 J5 V10C	DA100 J5 V2016	9A100 S5 V887
	Finish	50	A100 J5 V10C/50	DA100 J5 V2016/50	9A100 S5 V887/50
Bi – Metal (Exhaust Valve)	Rough	35	-	-	9A463 M3 V887
	Rough	50	-	-	9A463 M3 V887/50
	Semi Finish	35	-	-	9A60 L5 V887
	Semi Finish	50	-	-	9A60 L5 V887/50
	Finish	35	-	-	9A100 J5 V887
	Finish	50	-	-	9A100 J5 V887/50

CUMI Code	Grit Range	Diameter		Thickness		Hardness	Structure	Speed
CUMI Code	Grit Range	(mm)	(Inch)	(mm)	(Inch)	Hardness	Structure	(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.