Sandvik Coromant Quick Change for CNC Lathes - Manual (Page 33)

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Service interval
The life expectancy of a DTH is application dependent. Periodically,
perishable parts such as bearings and seals will need to be replaced.
Operating under normal conditions with 2 shifts we recommend to send
the DTH for service after 1 year. When operating under 3 shifts or heavy
conditions or high RPM a more frequent inspection is recommended.
For DTH with internal coolant supply, the service interval is every 6
month. Maintenance work is recommended to be done by Sandvik
Coromant.
For this reason it is good to standardize on the same unit (Cx size and
internal or external coolant) for:
• OD/External – often this is for just milling operations and
internal coolant is not needed.
• ID/Internal – often used for some drilling operations and
internal coolant is recommended.
Service time is up to three weeks - ensure back
up or schedule service.
OD/external ID/internal