How do you calculate customer turnaround time for a regrind batch?

Divide the tool count by your grinder's throughput to get base hours, then multiply by one plus your allowance. With 120 tools at 12 per hour and a 10% allowance, base time is 10 hours and adjusted time is 11 hours.

What is a good turnaround time for tool sharpening?

Most industrial regrind shops promise 3 to 5 business days for standard round tools and 24 to 48 hours for expedited service. The hours this calculator returns are pure processing time; add queue, shipping, and coating lead time to reach the calendar date you quote.

Why add an inspection and setup allowance?

Raw grinder throughput ignores incoming inspection, wheel changes, fixture setup, and final gauging. The allowance (10% here) captures that non-cutting time so your promise date does not slip on the touch labor the pure divide-by-rate math hides.

Turnaround time vs cycle time, what is the difference?

Cycle time is the grinder time for one tool; turnaround time is the whole batch from intake to ready. This calculator returns batch turnaround, so a single dull end mill at 12 per hour is 5 minutes of cycle time but the 120-piece batch is 11 adjusted hours.

How do I promise a faster turnaround without lying to the customer?

Raise throughput (add a grinder shift or run a dedicated line for round tools), lower the batch, or split the order so the customer's most-needed tools ship first. Rerun the calculator with the new numbers before you commit to a date.

Does this include coating strip and recoat time?

No. The allowance covers inspection and setup, not send-out PVD stripping and recoating, which typically adds 2 to 5 business days. Track coating lead time separately and add it to the computed hours when the job requires a fresh TiAlN or TiN layer.

Tool Sharpening, Reconditioning & Industrial Repair Services calculator

Customer Turnaround Time Calculator

Customer turnaround time is the total hours a sharpening or reconditioning shop needs to move a batch of cutting tools from intake to ready-for-pickup. Service managers and CNC grinding leads use it to set honest promise dates for regrinding drills, end mills, hobs, saw blades, or broaches. It matters because a missed turnaround forces the customer's machining line to run a dull or spare tool, and repeat late deliveries are the fastest way to lose a reconditioning contract. This calculator converts batch size and real grinder throughput into an adjusted time that already accounts for inspection, teardown, and coating handling.

What this calculator does

Customer turnaround time is the total hours a sharpening or reconditioning shop needs to move a batch of cutting tools from intake to ready-for-pickup.
Use it when customer turnaround time in tool sharpening, reconditioning and industrial repair services needs a defensible run time before a quote goes out.
It computes the adjusted labor hours to process a batch of tools by dividing the tool count by grinder throughput, then padding for inspection and setup.

Formula used

Base customer turnaround time time = required work ÷ processing rate
Adjusted time = base time × allowance factor

Inputs explained

Tools in the repair batch:
Grinder throughput (tools sharpened per hour):
Inspection and setup allowance:

How to use the result

Use it when quoting a promise date for an inbound regrind or repair batch, or when scheduling the next day's cell load across grinders.
It models a single throughput rate; mixed geometries, coating strip-and-recoat lead time, or waiting on a customer teardown decision can push real calendar turnaround well past the computed run hours.

Common questions

How do you calculate customer turnaround time for a regrind batch? Divide the tool count by your grinder's throughput to get base hours, then multiply by one plus your allowance. With 120 tools at 12 per hour and a 10% allowance, base time is 10 hours and adjusted time is 11 hours.
What is a good turnaround time for tool sharpening? Most industrial regrind shops promise 3 to 5 business days for standard round tools and 24 to 48 hours for expedited service. The hours this calculator returns are pure processing time; add queue, shipping, and coating lead time to reach the calendar date you quote.
Why add an inspection and setup allowance? Raw grinder throughput ignores incoming inspection, wheel changes, fixture setup, and final gauging. The allowance (10% here) captures that non-cutting time so your promise date does not slip on the touch labor the pure divide-by-rate math hides.
Turnaround time vs cycle time, what is the difference? Cycle time is the grinder time for one tool; turnaround time is the whole batch from intake to ready. This calculator returns batch turnaround, so a single dull end mill at 12 per hour is 5 minutes of cycle time but the 120-piece batch is 11 adjusted hours.
How do I promise a faster turnaround without lying to the customer? Raise throughput (add a grinder shift or run a dedicated line for round tools), lower the batch, or split the order so the customer's most-needed tools ship first. Rerun the calculator with the new numbers before you commit to a date.

Last reviewed 2026-05-12.