App Overview
Spring is designed for crown-molding and trim planning when the room corner is not exactly the nominal angle. Enter the actual corner angle and the molding's spring angle, choose the corner direction, and review the calculated miter and bevel guidance before making a test cut.
Main Features
- Enter a real wall-corner angle instead of assuming every corner is exactly 90 degrees.
- Choose between an inside corner and an outside corner so the result matches the joint being planned.
- Use the crown-molding cut type shown in the calculator workflow.
- Start from common angle presets, including 90° inside, 90° outside, and 135° bay-window examples, or enter a measured value.
- Enter the molding spring angle, such as 38°, or choose a saved or standard spring-angle value from the angle library.
- Review the resulting saw miter and blade-bevel guidance before transferring the settings to the saw.
- Use the project, library, export, and settings areas to organize saved angle work and manage the app workflow when available on your device.
How to Calculate a Corner
Why the Real Wall Angle Matters
A nominal 90° setting can produce a poor joint when the actual wall is open, tight, or part of a bay window. Measure both walls with a suitable angle tool, keep the measurement in the same convention used by Spring, and use the measured value rather than the nearest preset whenever accuracy matters.
Common Questions
- Why does my result differ from a 90° chart? Spring uses the actual wall angle and spring angle. A non-90° wall or a different molding profile can produce a different setting.
- Why do inside and outside corners have different results? They are different joint geometries. Recheck the corner direction before copying a value to the saw.
- Why does the saw scale not match the displayed value? Saw scales and calculators can use different reference directions or labels. Treat the result as the required angle, check the saw manual, and make a scrap test cut.
- Which spring angle should I use? Use the actual spring angle of the molding profile. If it is unknown, measure the molding or use the manufacturer's specification instead of guessing.
- Can I use a preset for a bay window? The 135° preset is a starting point for that example. Measure the installed corner because real walls and windows vary.
Measurement and Cutting Safety
Spring provides planning calculations, not a guarantee that a joint will fit. Verify the wall angle, molding profile, spring angle, saw setup, blade position, kerf, and cut direction at the job site. Make a test cut on scrap, keep hands clear of the blade, follow the saw manufacturer's instructions, and use appropriate eye, hearing, and respiratory protection.
Privacy and Data Handling
Spring's angle workflow does not require personal information to calculate a result. See the Spring Privacy Policy for how calculation inputs, saved projects, library values, settings, and exports are handled.
Support Contact
For a bug report or calculation question, include the Spring version, iOS version, device model, cut type, inside or outside corner, wall angle, spring angle, and the result you expected. Do not include private project details unless they are necessary to reproduce the issue.
- Developer: JiaBao Dai
- Email: 298030287@qq.com
- Response time: Usually within 24 business hours