Centre Hole Grinder

High-Precision Centre Reference — Achieves a centre hole roundness of 0.0015mm, giving shafts a true, consistent locating point that directly improves the accuracy of every subsequent between-centres grinding or turning operation.

Fine Surface Finish — Delivers a centre hole roughness of Ra0.8, reducing wear on centres and improving contact stability during repeated handling and re-fixturing of the workpiece.

Optional Air Blower Configuration — An air blower option is available for parts up to 400mm in length, helping clear grinding debris from the centre hole for a cleaner finish and more consistent results on shorter shafts.

Wide Part Capacity — Handles shafts up to 1000mm in length, Φ320mm in rotary diameter, and 150kg in weight, covering the range of shaft sizes typically processed in cylindrical grinding production lines.

Improves Downstream Grinding Yield — A precisely ground centre hole reduces run-out and mis-location in subsequent cylindrical grinding, lowering scrap and rework rates across the shaft production process.

Zhejiang Quanshun Machine Tool Co., Ltd. designs the Centre Hole Grinder to complement its full range of cylindrical grinding machines, giving shaft manufacturers a complete process chain from centre reference preparation through final precision grinding. With 0.0015mm roundness and Ra0.8 surface finish, the machine helps reduce downstream scrap and improve overall part accuracy. We offer configuration options including the air blower attachment and support technical consultation, installation guidance, and after-sales service.

Why is centre hole grinding important before cylindrical grinding?

The centre hole serves as the locating reference for between-centres grinding, turning, and inspection. If it is not round and smooth, the shaft will run out of true during later operations, directly affecting final part accuracy.

What size parts can this machine process?

The machine handles parts up to 1000mm in length (400mm when using the air blower configuration), Φ320mm in rotary diameter, and up to 150kg in weight.

What precision does this machine achieve?

The centre hole roundness reaches 0.0015mm, with a surface roughness of Ra0.8, meeting the precision reference standards required for high-accuracy shaft production.

What is the air blower option used for?

The air blower configuration helps clear grinding debris from the centre hole during processing, improving finish consistency on parts up to 400mm in length.

Can specifications be customized?

Yes. Zhejiang Quanshun Machine Tool offers customization of maximum part length, rotary diameter, and machine configuration based on specific shaft manufacturing requirements.