Centerless Grinding – Bearing Ring

Name: Centerless Grinding - Bearing Ring
Brand: CUMI Abrasives
SKU: CGW-BR-001
Author: CUMI Abrasive Team

Good

Bearing Ring 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
Outer Diameter (TRB, SRB, CRB)	Rough & Finish	35	A463 L5 V10C	-	-
Outer Diameter (TRB, SRB, CRB)	Rough & Finish	50	A463 L5 V10C/50 A80 K5 V10C/50	DA54 I6 TDV876/50 DA80 I6 TDV876/50	55A54 I7 VC500/50 55A80 I7 VC500/50
Outer Diameter (Ball Bearing) 610 x 610 x 304.8 508 x 610 x 304.8 610 x 508 x 304.8	Roughing & Finishing	50	DA60 I6 TDV876	1CUMISA461 J6 VCAE/50	53MA461 J7 VC500/50
			DA80 I6 TDV876	1CUMISA541 J6 VCAE/50	53MA541 J7 VC500/50
			-	1CUMISA601 J6 VCAE/50	53MA601 J7 VC500/50
			-	1CUMISA801 I6 VCAE/50	53MA801 J7 VC500/50
	Roughing & Finishing	63	-	1CUMISA461 J6 VCAE/63	53MA461 J7 VC500/63
			-	1CUMISA541 J6 VCAE/63	53MA541 J7 VC500/63
			-	1CUMISA601 J6 VCAE/63	53MA601 J7 VC500/63
			-	1CUMISA801 I6 VCAE/63	53MA801 J7 VC500/63
Outer Diameter (Railway Bearing) 610 x 864 x 304.8	Roughing & Finishing	35	-	-	RAA60 J+4 V2016
			-	-	RAA80 J+4 V2016
			-	-	RAA100 I+4 V2016

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

Bearing

Applications

Ring Outer Race

Centreless

Product Description

Centerless grinding for bearing rings demands exceptional OD roundness, parallelism, and surface finish—parameters that directly influence friction, noise, and bearing life. CUMI Centerless Grinding Wheels are engineered for high-volume ring production, supporting long dressing intervals, burn-free cutting, and consistent wheel wear across multi-spindle configurations.

Feature → Advantage → Benefit

Multi-bond engineered system (vitrified, resin, rubber) → optimized cutting profile → prevents thermal burn & microstructural damage
Precision geometry & density control → uniform wear across wheels → eliminates taper and OD variation in rings
High-performance abrasive grains → fast stock removal → reduced cycle time & lower energy load
Through-feed, end-feed & in-feed compatible → machine-agnostic flexibility → higher uptime & lower changeover effort
Custom hardness/porosity per ring size → tailored cutting response → lowers CPC (cost-per-component) in mass bearing production

Industry: Bearing Industry – OD grinding of inner & outer bearing rings