Marianne Martinez
Box and pan brakes are used for bending sheet metal. They can be adjusted for sheet metal thickness and alignment/setback. The adjustment process involves set screws in the pressure beam fingers to move the mandrel towards or away from the bending leaf. The clamping force for different gauges can also be adjusted by changing the length of the rods on the side. When adjusting a box pan brake, it is important to ensure that the fingers are aligned and that the material is clamped firmly to prevent wiggling.
| Characteristics | Values |
|---|---|
| Clamping force adjustment | Shortening or lengthening the rods on the side |
| Fore and aft position adjustment | Adjustable for different gauges |
| Springback | Possible due to wiggling of the part |
| Fingers | Should touch across the whole flat on the bottom |
| Sheet metal thickness adjustment | Set screws in the pressure beam fingers |
| Alignment | Good alignment/setback |
| Material | Multi-use tool should be adjusted for each material |
| Base | Made from cold rolled steel |
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What You'll Learn
Adjusting for sheet metal thickness
Adjusting a box pan brake for sheet metal thickness involves several steps. Firstly, it is important to note that the setup of the box pan brake will depend on the thickness and temper of the sheet metal being used. Therefore, adjustments must be made to the machine prior to beginning any bending.
One method for adjusting for sheet metal thickness involves utilising set screws in the pressure beam fingers, which move the mandrel towards or away from the bending leaf. This allows for fine-tuning the distance between the mandrel and the bending leaf to accommodate the specific thickness of the sheet metal. An alternative approach is to incorporate an eccentric mechanism into the pressure beam pivot, providing a more streamlined solution.
The clamping pressure also plays a crucial role in accommodating different sheet metal thicknesses. To set the clamping pressure, a piece of material with the same thickness as the sheet metal to be bent is placed under the brake radius piece. The clamping lever is then pulled towards the operator to test the pressure. Adjustments can be made using the clamping pressure nut until the desired pressure is achieved, ensuring that the sheet metal remains securely in place during bending operations.
Additionally, the brake radius bars can be replaced with alternatives of varying diameters to cater to different sheet metal thicknesses. If the required bend radius is larger than the installed brake radius bar, nose radius shims can be bent and added to increase the effective radius. It is imperative to consult bend radius charts or conduct experiments with scrap materials to determine the appropriate thickness adjustments for achieving the desired bend radius.
The VEVOR Box and Pan Brake, for instance, offers adjustable fingers for metal bending, catering to both heavy-duty sheets and light metals. This feature enables users to adjust the machine according to the thickness of the sheet metal being worked on, ensuring precise and accurate bends.
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Reducing finger wiggle
A finger brake, also known as a box and pan brake, is a machine used to bend and fold metal sheets into various shapes and angles accurately. The "fingers" are movable blocks that can be adjusted to accommodate different sizes and shapes of workpieces.
To reduce finger wiggle, you can try the following adjustments:
Firstly, ensure that you are using the correct finger sizes for your specific application. A kit of different finger sizes can improve the adaptability of your machine. If the fingers are too small or too large for the workpiece, they may not hold it securely, leading to increased wiggle.
Secondly, adjust the position and height of the fingers to achieve precise and consistent bending results. By minimising any gaps or play between the fingers and the workpiece, you can reduce wiggle room and improve the accuracy of your bends.
Additionally, consider the material thickness of your workpiece. The fingers should be adjusted to accommodate the thickness of the metal sheet. If the fingers are not properly aligned with the thickness, it may result in imprecise bends and increased wiggle.
Furthermore, check the clamping bar and bending blade for any signs of wear or misalignment. The clamping bar should descend smoothly and securely, holding the workpiece firmly in place. The bending blade should then be raised without any obstruction, creating a precise bend. If there is any play or wiggle in these components, it will affect the accuracy of your bends.
Finally, advanced finger brakes with technological innovations such as CNC systems, multi-axis controls, and automation can help improve processing quality and reduce finger wiggle. These systems can self-adjust and optimise the bending process, minimising the potential for human error and improving precision.
By making these adjustments and ensuring your finger brake is properly calibrated, you can effectively reduce finger wiggle and improve the accuracy and consistency of your bending applications.
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Improving alignment
Another way to improve alignment is to adjust the setback. This can be done by taking into account the thickness of the material being used and adjusting the machine accordingly. For example, if the fingers are only contacting the material at the front edge, the rods on the side can be shortened or lengthened to adjust the clamping force.
Additionally, the fore and aft position of the top leaf can be adjusted for different gauges. This allows for better alignment when working with materials of varying thicknesses.
It is also important to ensure that the bed of the machine is straight. If the bed is not stiff enough, it may bow during bending, causing the material to spring back and the bend angle to vary along the length.
Furthermore, when modifying a sheet metal brake into a box pan brake, it is crucial to consider the design and construction. For instance, using cold-rolled steel for the sides ensures flatness and squareness, while the pivot point for the screws that raise and lower the fingers should be carefully chosen to avoid weakness in the design.
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Using the correct wrench
When adjusting a box pan brake, it is important to use the correct wrench. This will ensure that you do not damage the screw heads and will help to prolong their life.
The correct size wrench will depend on the make and model of your box pan brake. For example, the Artisans Asylum Wiki page for the box and pan brake states that a 6 mm Allen wrench is used to adjust the fingers on their machine. The proper size wrench will help to prolong the life of the screw heads. It is important to loosen and align the fingers, then re-tighten before placing the sheet metal under the fingers and positioning as needed.
In some cases, you may need to adjust the setback or spine of your box pan brake if it is not bending plate as effectively as it should. This can be done by taking the fingers off and using a straightedge to check for any bends or warping. If there is a bend, it can be straightened with a small jack and large clamps on a length of heavy box or similar material.
Additionally, if you are using a box pan brake that requires set screws in the pressure beam fingers to adjust the mandrel, you may want to consider adding an eccentric mechanism to the pressure beam pivot to reduce the fiddliness of this process.
It is important to adjust your box pan brake for each material and job. This will ensure that your bends are accurate and consistent.
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Adjusting for different gauges
Adjusting a box pan brake for different gauges typically involves modifying the clamping force and the fore-and-aft position of the top leaf. This can be achieved by shortening or lengthening the rods on the side of the brake. For example, a 412 model is good for a 12-gauge at 4 feet, while a 16-gauge would require different adjustments.
When working with various gauges, it is essential to ensure that the fingers of the brake are properly clamped down. This can be done by adjusting the base table and folding apron to lower them, and then using large acme screws to move the top apron back. Additionally, the fingers can be modified to have rounded edges or different radii to accommodate different gauges.
To adjust for thinner gauges, one might need to modify the design of the box pan brake. For instance, the Gingery brake lacks adjustments for sheet metal thickness, so it must be built to handle the maximum thickness, resulting in sub-optimal bends for thinner materials. In some cases, it may be necessary to use scrap pieces of metal with different radii to achieve the desired bend.
It is worth noting that some brakes, like the Whitney Combination Brake, offer more flexibility in adjusting for different gauges. This brake allows for adjustments to the upper leaf, making it possible to mount radius dies. However, these brakes tend to be rarer and more expensive than standard finger brakes.
When adjusting a box pan brake for different gauges, it is crucial to refer to the manufacturer's instructions and diagrams. Additionally, it is important to exercise caution when making adjustments to avoid weakening the structure of the brake.
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Frequently asked questions
To adjust the fingers on your box pan brake, first, align them by loosening all, then raising the apron to line them up. Re-tighten. Use a 6 mm Allen wrench to adjust fingers 1/18” to 1/16” from the edge.
The clamping force for different gauges can be adjusted by shortening or lengthening the rods on the side.
This involves using set screws in the pressure beam fingers to move the mandrel towards or away from the bending leaf.
