How do you calculate spray time per part?

Divide the coating workload by the deposition rate to get base time, then multiply by one plus the allowance. With 120 units of work at 12 units/hr and a 10% allowance: 120/12 = 10 hr base, x 1.10 = 11 hr adjusted.

Why add a non-productive time allowance?

Pure deposition time ignores torch ramp-up, part indexing, pass-to-pass cooling stops, spray-pattern checks, and unloading. A 10-15% allowance captures that overhead so the schedule and quote reflect the floor, not the datasheet.

What is a typical allowance for a thermal spray cell?

For an automated robot cell with good part flow, 8-12% is common; manual spraying or fixtures needing frequent re-clamping and cooling can push it to 20% or more. The default uses 10%.

Does this include grit blasting and masking?

No. This is spray and handling time only. Add grit-blast prep, masking, and finish grinding from their own calculators to get a true door-to-door cycle time per part.

How do I reduce spray time per part?

Raise the effective deposition rate with a hotter or higher-flow setup where the coating spec allows, reduce indexing time with better fixturing, and cut the allowance by overlapping cooldown with load/unload of the next part.

Is deposition rate the same as spray gun output?

Not exactly. Gun output is the raw feed rate; deposition rate is how fast usable coating actually builds on the part after transfer efficiency, so always use the on-part rate from your process sheet.

Thermal Spray, Hardfacing & Wear Coatings calculator

Spray Time Per Part Calculator

Spray time per part converts a coating workload into a realistic cycle time, so a thermal spray cell knows how long the gun-on and handling time will actually run. Production planners and estimators use it to load the spray booth schedule, cost labor and gas per part, and quote lead times. The raw deposition time from the datasheet is always optimistic, which is why this calculator adds a non-productive allowance for ramp-up, indexing, pass-to-pass cooling, and gun checks. Getting it right keeps the booth from being over-promised and keeps per-part costing honest.

What this calculator does

Spray time per part converts a coating workload into a realistic cycle time, so a thermal spray cell knows how long the gun-on and handling time will actually run.
Use it when spray time per part in thermal spray, hardfacing and wear coatings is changing rate or allowance and you want to see the impact.
It computes the adjusted spray cycle time per part by dividing the coating workload by the deposition rate and then padding it with a non-productive time allowance.

Formula used

Base spray time per part time = required work ÷ processing rate
Adjusted time = base time × allowance factor

Inputs explained

Coating passes or volume to deposit:
Deposition (spray) rate:
Non-productive time allowance:

How to use the result

Use it when scheduling the spray booth, quoting labor and consumables per part, or checking whether a takt target is achievable.
It models spray and handling time only; it does not include grit-blast prep, masking, cooldown between coats, or post-spray grinding, which must be added separately for a full cycle.

Current U.S. benchmarks

Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The producer price index for industrial chemicals stands at 344.336 (BLS, May 2026), up 16.1% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate spray time per part? Divide the coating workload by the deposition rate to get base time, then multiply by one plus the allowance. With 120 units of work at 12 units/hr and a 10% allowance: 120/12 = 10 hr base, x 1.10 = 11 hr adjusted.
Why add a non-productive time allowance? Pure deposition time ignores torch ramp-up, part indexing, pass-to-pass cooling stops, spray-pattern checks, and unloading. A 10-15% allowance captures that overhead so the schedule and quote reflect the floor, not the datasheet.
What is a typical allowance for a thermal spray cell? For an automated robot cell with good part flow, 8-12% is common; manual spraying or fixtures needing frequent re-clamping and cooling can push it to 20% or more. The default uses 10%.
Does this include grit blasting and masking? No. This is spray and handling time only. Add grit-blast prep, masking, and finish grinding from their own calculators to get a true door-to-door cycle time per part.
How do I reduce spray time per part? Raise the effective deposition rate with a hotter or higher-flow setup where the coating spec allows, reduce indexing time with better fixturing, and cut the allowance by overlapping cooldown with load/unload of the next part.

Last reviewed 2026-05-12.