Use the machining coolant correction worksheet for a fixed approved premix or a balanced fill. Conservation supplies the arithmetic; product and shop instructions govern its use.
1. Identify product, instrument and measurements
Read the product and machine instructions. Record the exact coolant, factor, instrument identity and labeled range. Zero with the same mix water under the instrument instructions. A top-limit reading can be clipped and under-report concentration. Neither a Brix number nor the worksheet can detect that automatically.
2. Brix multiplication and percentage
Master Fluid Solutions Technical Bulletin 110, page 2, specifies coolant concentration as refractometer reading times the product Brix factor. Zebra independently gives a 5% known sample reading 2.5 Brix, factor 2. An unknown factor must not be guessed. Percentage means concentrate-equivalent volume within the final mixture, not weight or water-to-concentrate ratio.
3. Balanced fill to full
Master names current/target concentration and current/full volume. Excision independently counts existing versus desired components. At 80 L and 5%, existing concentrate-equivalent volume is 4 L. A 100 L full volume at 5% needs 5 L, so the missing 20 L contains 1 L concentrate and 19 L water: 5% makeup. At 6% current fluid the same fill requires 1% makeup; at 4% it requires 9%. These are arithmetic examples, not recommended concentrations. The tool checks your product-approved limits.
4. Fixed approved premix and usable capacity
At 80 L and 6%, target 5%, fixed approved 2% makeup would need 80/3 L simple addition, which cannot fit a 100 L usable sump. The derived capacity balance retains 75 L, removes 5 L and adds 25 L premix: retained concentrate 4.5 L plus 0.5 L added yields 5 L at full. Complete replacement drains liquid present and refills to usable capacity, not starting volume. Shop isolation and drain procedures govern handling.
5. Keep units and price together
A US liquid gallon equals 3.785411784 liters exactly from NIST definitions. Liters and gallons describe liquid volume, not ingredient mass. New-concentrate cost is concentrate within the premix times price per matching volume unit. It excludes existing fluid, water, disposal, labor and tax. Display rounding does not feed the equations. A tiny numerical result follows the precision of entered measurements.
6. Print, mix and remeasure
Prepare premix with the water first, then add concentrate while mixing; never add water to concentrate. Follow the product's own procedure. Mix and remeasure as instructed; no universal circulation time is supplied. Keep dated product, machine, operator, instrument/range, inputs, state, volumes, warnings and actual remeasurement. A mathematical endpoint is not approval for direct addition. The worksheet does not assess fluid condition, compatibility or machine safety.