Example Data Table
| Master Width |
Strips |
Target Width |
Trim |
Kerf |
Required Width |
Spare Width |
| 1250 mm |
6 |
200 mm |
5 + 5 mm |
0.20 mm |
1211.00 mm |
39.00 mm |
| 1220 mm |
8 |
150 mm |
6 + 6 mm |
0.15 mm |
1213.05 mm |
6.95 mm |
| 800 mm |
4 |
Custom |
5 + 5 mm |
0.25 mm |
770.75 mm |
29.25 mm |
Formula Used
Internal cuts: strip count - 1
Total kerf loss: cut count × kerf per cut
Available width: master width - left trim - right trim - kerf loss
Equal strip width: available width ÷ strip count
Required master width: total finished width + edge trims + kerf loss
Width yield: total finished strip width ÷ master coil width × 100
Weight: density × width × thickness × length
Resistance: resistivity × length ÷ cross-sectional area
How to Use This Calculator
Select the calculation mode first. Enter the master coil width, strip count, target width, trims, kerf, and thickness. Add material density and resistivity when weight or electrical resistance matters. Use custom width mode for mixed strip sizes. Press Calculate to review the plan. Use CSV or PDF to save the result.
Slit Coil Width Planning
Slit coil work needs a careful width plan. A master coil is divided into narrow strips. Each strip must meet a target width. The slitting line also uses edge trim and knife space. These small losses matter. They can decide whether an order fits the incoming coil.
Why Width Loss Matters
Electrical coils often use copper, aluminum, or electrical steel. These materials can be costly. A small planning error can create scrap, short strips, or rejected batches. The calculator separates finished width, edge trim, kerf, and spare width. This makes the job easier to review before production starts. It also helps buyers choose a better master coil size.
Useful Production Checks
The tool can calculate equal strip width from a master coil. It can also estimate the required master width for a target strip width. A third option finds the maximum strip count. The custom width mode is useful when one coil must make many different strip sizes. Tolerance checking adds another practical layer. It shows whether the calculated slit is close to the desired strip width.
Electrical Value
For electrical work, width is not only a mechanical number. Strip width and thickness control cross section. Cross section affects current capacity and resistance. The calculator uses material density to estimate strip weight. It also uses resistivity to estimate direct current resistance. These estimates help compare copper, aluminum, and steel strip plans. They are still planning values. Final approval should follow plant standards and customer drawings.
Better Slitting Decisions
A good slit plan reduces handling problems. It also improves coil yield. The result table shows used width, loss width, yield, length, weight, and resistance. CSV and PDF exports help save the run for quoting, setup, or record keeping. Always confirm machine limits before cutting. Check knife clearances, burr limits, camber, crown, and minimum trim rules. When the material is expensive, a clear width plan protects both quality and profit.
Setup Notes
Use real shop values for trim and kerf. Do not guess. Knife thickness, strip tension, and coil shape can change the final result. Recheck the first slit sample with a calibrated gauge. Update the plan when the line operator reports a different cutting allowance during setup.
FAQs
What is a slit coil width?
It is the finished width of each narrow strip after a master coil is cut on a slitting line. The width plan must include trims and knife loss.
Why is kerf included?
Kerf represents material or clearance lost at each cut. Even a small kerf can affect total yield when many strips are produced from one coil.
What does edge trim mean?
Edge trim is removed from the left and right coil edges. It helps remove damaged edges and supports clean finished strip sides.
Can I calculate mixed strip widths?
Yes. Choose custom width mode and enter each strip width separated by commas, spaces, semicolons, or line breaks.
What density should I use?
Use the density of the actual material. Copper, aluminum, steel, and nickel all have different values, so weight estimates change by material.
How is electrical resistance estimated?
The calculator uses strip length, resistivity, width, and thickness. It gives a planning estimate for direct current resistance of each strip.
Is the maximum strip count exact?
It is a planning result based on entered width, trim, and kerf. Always compare it with machine limits, knife setup rules, and customer tolerances.
Why are CSV and PDF exports useful?
CSV helps with spreadsheets and production records. PDF gives a simple report for quoting, job review, approval, or setup discussion.