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CUMI's centerless grinding wheels for bright bar steel

Centerless Grinding Wheels for Bright Bar Steel Applications

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CUMI’s centerless grinding wheels — also known on the shop floor as a grinding stone   or grinder stone   — for bright bar steel are built for steel plants, shaft manufacturers, and precision rod suppliers who need consistent diameter, roundness, and surface finish on continuously processed bar stock. Because multiple wheels are often mounted on a single spindle for bright bar lines, CUMI holds extremely tight tolerances in each wheel’s geometry and density to maintain uniform wear across the set. Vitrified, resin, and rubber bond systems are matched to through-feed, in-feed, and end-feed setups, with custom specifications available for each steel grade and production line.
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Brand: CUMI

Information Material:

Product Catalogue
Type Operation Speed Good Better Best
BRIGHT BAR Rough 35 DA463 L5 V600 C/G463 M5 VPZ C463 M5 VG
50 - CA60 J5 B99S/50 1CUMISA463 N5 B820/50
Finish 35 DA60 L5 V600 C601 M5 VG -
50 C603 N5 B820/50

CA60 J5 B99S/50 		1CUMISA603 N5 B820/50
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
Steel
Applications
Centreless
Product Description

Centerless Grinding Wheels for Bright Bars

The CUMI Centerless Grinding Wheel for Bright Bars is engineered for steel plants, shaft manufacturers, precision rod suppliers, and machining units where dimensional accuracy and surface finish are critical. Designed using advanced vitrified, resin & rubber bond formulations, it ensures uniform grinding even when multiple wheels are mounted on a single spindle.

Built to handle through-feed, in-feed, and end-feed bright bar grinding, the wheel maintains geometry across its life—reducing dressing frequency and improving output consistency. The result: smoother bars, reduced taper, excellent roundness, and improved downstream machinability.

Features, Advantages & Benefits

  • Multiple bond systems (vitrified/resin/rubber) → Tailored per application → Consistent results across steel grades
  • Controlled density & geometry → Uniform wear curve → Long-lasting wheel life, fewer replacements
  • Precision form-holding → Maintains roundness and tolerance → Bright bars meet QC specs without rework
  • Designed for high-load centerless grinding → Handles continuous plant production → Improved operational uptime
  • Custom-made options → Shape, size, grit & hardness → Perfect fit for each steel plant line

Through-Feed vs. In-Feed vs. End-Feed Centerless Grinding:

  • Through-feed grinding: Passes the bar continuously between the wheels for constant-diameter stock.
  • In-feed grinding: Holds the bar in place while the wheel advances — used for parts with shoulders or steps.
  • End-feed grinding: Used for tapered or formed profiles fed in from one end.

Tolerance & Quality Outcomes: Placeholder — quantify roundness, taper, or surface finish improvement if data exists; otherwise mark as info required from product/technical team.

Pricing & Enquiry: For the current price of this product, please contact CUMI directly or reach out to your nearest authorised dealer, as pricing depends on order quantity, dealer location, and applicable taxes. To get a quote or enquire about bulk pricing, visit the Contact Us or connect with a CUMI distributor in your region.

FAQs
01.
Where is this grinding wheel used? Used in steel bright bar units, shaft/rod manufacturing, CNC machining feeder bars & forging stock preparation.
02.
Can this wheel grind stainless steel? Yes — custom formulations are available for SS, carbon steel, alloy & tool steel bars.
03.
Does the wheel support high-feed grinding? Yes — the vitrified and resin bond variants are suited for high-load continuous grinding lines.
04.
Does it require frequent dressing? No — its form-holding property ensures reduced dressing frequency, saving production time.
05.
What type of grinding does it support? Supports through-feed, in-feed & end-feed centerless grinding.
06.
What is centerless grinding used for in bright bar steel production? It brings rolled or peeled bar stock to a precise final diameter with a smooth, bright surface finish, without needing to mount the bar between centers — suitable for continuous, high-volume bar processing.
07.
What's the difference between through-feed, in-feed, and end-feed centerless grinding? Through-feed grinding continuously moves cylindrical parts between the wheels, ideal for high-volume production. In-feed grinding holds the workpiece in position, suitable for complex shapes and multiple diameters. End-feed grinding feeds parts to a stop, making it suitable for tapered components and specific sections.
08.
Is this wheel suitable for stainless bright bars as well as carbon steel? Yes, custom formulations are available for SS, carbon, alloy, and tool steel bars
09.
How does CUMI ensure uniform wear when multiple wheels are mounted on one spindle? Extremely tight tolerances are held in the geometry and density of each wheel in the set to maintain a consistent wear pattern across the spindle.
10.
Grinding stone for iron? Yes, CUMI's centerless grinding wheels (also referred to as grinding stones) are formulated for carbon steel, alloy steel, and iron bar stock, with custom specifications available.

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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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