Setting the angle on a sliding bevel involves loosening its locking mechanism, positioning the blade relative to the stock at the desired angle using a reference, and then securely tightening the lock.
A sliding bevel (or bevel gauge) is a hand tool used to mark or check angles, particularly those that are not 90 degrees. It consists of a stock (handle) and an adjustable blade that pivots. The angle is set by positioning the blade relative to the stock and then locking it in place.
The Basic Process
The fundamental steps for setting any angle on a sliding bevel are simple:
- Loosen the Lock: Undo the wing nut, lever, or screw that locks the blade's position. This allows the blade to pivot freely.
- Set the Angle: Position the blade against the stock to create the desired angle. This step requires a reference for the correct angle.
- Tighten the Lock: Once the blade is at the correct angle, firmly tighten the locking mechanism to prevent the blade from moving.
Methods for Setting the Angle
The critical part is setting the angle accurately in Step 2. Here are common ways to do this:
Using a Marked Line or Template
One precise method is to set the bevel against a pre-drawn angle or a template. As seen in the reference, you can align the bevel with a line marked at the desired angle.
- Place the stock of the sliding bevel along a reference edge or baseline.
- Pivot the blade until its edge aligns perfectly with the marked angle line.
- Ensure that the top of the sliding bevel lines up to the [marked] degree line which is created, this is very important for the precision and actually throughout your marking, as highlighted in the reference. Aligning the top edge of the blade accurately with the line is key.
- Hold the blade firmly against the line and tighten the locking mechanism.
This method is particularly useful when transferring an angle directly from a plan or another workpiece.
Using Angle Measurement Tools
Specialized tools help set specific, measurable angles accurately:
- Protractor: Place the stock of the bevel along the protractor's base and pivot the blade to align with the desired degree mark.
- Speed Square: A speed square has common angles marked (like 45° and 30°/60°). You can rest the bevel's stock against the square's fence and align the blade with the corresponding angle mark.
- Combination Square: Similar to a speed square, the head of a combination square is typically set at 90° and 45°. Use the 45° face or the rule with an angle finder attachment.
- Digital Angle Finder: These electronic tools provide a digital readout of the angle. Place the bevel's stock on one leg of the angle finder and align the blade with the other leg until the display shows the target angle.
Transferring an Existing Angle
A sliding bevel is excellent for copying an angle directly from an existing object or joint:
- Place the stock firmly against one face of the angle you want to copy.
- Pivot the blade until its edge lies flush against the other face of the angle.
- Tighten the lock securely.
Importance of a Secure Lock
Regardless of the method used, ensuring the blade is securely locked is paramount for accurate marking or checking. A loose blade can shift, leading to errors in your work.
Tools for Setting Angles on a Sliding Bevel
Here's a quick look at common tools used in conjunction with a sliding bevel:
| Tool | Primary Use | Notes |
|---|---|---|
| Marked Line/Template | Copying specific designs | Requires careful alignment of the blade top |
| Protractor | Setting specific degrees | Useful for any angle measurement |
| Speed Square | Common building angles | Quick for 45°, 30°, 60° |
| Combination Square | 90° and 45° references | Versatile layout tool |
| Digital Angle Finder | Precise digital measurement | Often provides fractional degrees |
| Existing Workpiece | Transferring angles | Ideal for matching existing conditions |
Practical Tips
- Check on Scrap: Before marking your final piece, test the angle on a piece of scrap material to ensure it is correct.
- Tighten Firmly: Make sure the locking mechanism is completely tight so the blade cannot move during use.
- Keep it Clean: Ensure the pivot point and blade edge are free of debris for smooth movement and accurate setting.
By using a reliable reference, such as a marked line, protractor, or existing angle, you can accurately set your sliding bevel for precise layout and joinery tasks.
