Boards Should Be Fed Into The Planer

Feeding boards into a planer correctly is crucial for achieving smooth, consistent results and ensuring the safety of both the operator and the machine. A planer is a woodworking tool designed to reduce the thickness of a board by shaving off thin layers of wood with rotating blades. Mastering the technique of feeding boards properly into the planer involves understanding the machine's mechanics, preparing the wood, and executing the feed with precision. This comprehensive guide covers everything you need to know about safely and effectively feeding boards into a planer, ensuring optimal results every time.

Understanding the Planer

Before diving into the specifics of feeding boards, it’s essential to understand the basic components and functions of a planer.

• Cutterhead: The heart of the planer, the cutterhead, houses the blades that shave off wood. It rotates at high speeds, so safety is paramount.
• Infeed and Outfeed Tables: These tables support the board as it enters and exits the planer. They must be properly aligned to ensure a flat, even surface.
• Feed Rollers: These rollers grip the board and pull it through the planer. The infeed roller is typically serrated to provide a firm grip, while the outfeed roller is usually smooth to prevent marking the planed surface.
• Depth Adjustment: This mechanism allows you to control the amount of material removed with each pass. It’s crucial to make small adjustments to avoid stressing the machine or the wood.
• Dust Collection Port: Planers generate a significant amount of sawdust, so a dust collection system is vital for maintaining a clean and safe workspace.

Preparing the Wood

Proper wood preparation is the first step in achieving excellent planing results. Taking the time to inspect and prepare your boards will significantly improve the outcome and reduce the risk of issues during the planing process.

Inspecting the Wood

• Check for Foreign Objects: Before feeding any board into the planer, meticulously inspect it for nails, screws, staples, or any other foreign objects. These can severely damage the planer blades and pose a safety hazard. Use a metal detector if necessary, especially with reclaimed wood.
• Identify Grain Direction: Understanding the grain direction is crucial for avoiding tear-out. Tear-out occurs when the planer blades lift the wood fibers instead of cutting them cleanly, resulting in a jagged surface. Generally, you should feed the board into the planer with the grain sloping downwards towards the outfeed side.
• Assess for Warping, Cupping, and Twisting: Warped, cupped, or twisted boards can be challenging to plane. Identify these defects and consider using a jointer first to create at least one flat face. This flat face will then serve as a reference when planing the opposite side.

Initial Flattening with a Jointer (If Necessary)

A jointer is used to create a flat, square edge on a board. If your board has significant warping, cupping, or twisting, using a jointer before the planer is highly recommended.

• Create a Reference Face: The primary goal with the jointer is to create one perfectly flat face. This face will be placed downwards on the planer bed and act as a stable reference point.
• Joint an Edge: After creating a flat face, use the jointer to create a square edge to the flat face. This ensures that the board has at least one true reference point before planing.

Drying and Acclimation

• Ensure Proper Moisture Content: Wood that is too wet or too dry can cause problems during and after planing. Aim for a moisture content appropriate for your region and the intended use of the wood. Use a moisture meter to check the wood's moisture content.
• Acclimate the Wood: Allow the wood to acclimate to your workshop environment for several days before planing. This helps to reduce the risk of warping or cupping after the wood has been planed.

Setting Up the Planer

Proper planer setup is essential for achieving consistent and accurate results. Taking the time to calibrate and adjust your planer will save you time and frustration in the long run.

Adjusting the Infeed and Outfeed Tables

• Ensure Coplanarity: The infeed and outfeed tables should be perfectly aligned with the cutterhead. Use a straightedge to check for any dips or rises. Shim the tables as necessary to achieve coplanarity. Misaligned tables can cause snipe, which is an unwanted dip at the beginning and end of the board.
• Wax the Tables: Applying a coat of paste wax to the infeed and outfeed tables reduces friction and allows the board to glide smoothly. This is particularly important for longer boards.

Setting the Depth of Cut

• Start with a Shallow Cut: Begin with a very shallow cut, typically no more than 1/16 inch (1.6 mm). Taking too much material in a single pass can overload the motor, cause the blades to dull quickly, and increase the risk of tear-out.
• Incremental Adjustments: Make incremental adjustments to the depth of cut as needed. It’s always better to make multiple shallow passes than one deep pass.
• Consider Wood Hardness: Softer woods can handle slightly deeper cuts than hardwoods. However, it’s still best to err on the side of caution and take shallow passes.

Ensuring Proper Dust Collection

• Connect to a Dust Collector: A dust collection system is essential for safety and cleanliness. Connect your planer to a dust collector with sufficient airflow to remove chips and dust effectively.
• Check for Blockages: Regularly check the dust collection hose and port for blockages. A blocked system can reduce the planer's efficiency and create a fire hazard.

Feeding the Board

With the wood prepared and the planer set up, you are ready to feed the board. This is where technique and attention to detail are most important.

Initial Pass

• Place the Board on the Infeed Table: Position the board squarely on the infeed table, ensuring it is flat and stable.
• Apply Even Pressure: Use both hands to guide the board into the planer. Apply even pressure to keep the board flat against the table. Avoid pushing too hard, as the feed rollers should pull the board through the machine.
• Maintain a Steady Feed Rate: Feed the board at a consistent rate. Feeding too quickly can overload the motor and cause the blades to chatter. Feeding too slowly can cause burning.

Subsequent Passes

• Inspect the Surface: After the initial pass, inspect the surface for any imperfections, such as tear-out or unevenness.
• Adjust Depth as Needed: If further thickness reduction is required, adjust the depth of cut and repeat the process.
• Alternate Sides: To minimize stress and potential warping, alternate planing each side of the board. This helps to balance the internal forces within the wood.

Handling Long Boards

• Use Support Rollers: When planing long boards, use support rollers or extension tables to provide additional support and prevent the board from sagging.
• Extra Assistance: For extremely long boards, consider having a helper support the outfeed end to prevent the board from dropping and causing snipe.

Preventing Snipe

Snipe is a common issue that occurs when the board is not fully supported at the beginning and end of the cut, causing the blades to remove more material at these points.

• Maintain Constant Downward Pressure: As the board enters and exits the planer, maintain constant downward pressure on the infeed and outfeed tables.
• Sacrificial Boards: Use a sacrificial board of the same thickness as your workpiece. Feed the sacrificial board into the planer just before your workpiece and follow through with another sacrificial board. This helps to minimize snipe on the actual workpiece.
• Adjust Table Height: Ensure that the infeed and outfeed tables are perfectly aligned with the planer bed. Even slight misalignments can contribute to snipe.

Troubleshooting Common Issues

Even with careful preparation and technique, issues can arise during the planing process. Here are some common problems and how to address them.

Tear-Out

• Reduce Depth of Cut: The most common cause of tear-out is taking too deep of a cut. Reduce the depth of cut to 1/32 inch (0.8 mm) or less.
• Orient Grain Direction: Ensure that you are feeding the board with the grain sloping downwards towards the outfeed side.
• Sharpen Blades: Dull blades can exacerbate tear-out. Sharpen or replace your planer blades regularly.
• Skew the Board: Slightly skewing the board as it enters the planer can sometimes help to reduce tear-out by changing the angle at which the blades engage with the wood fibers.

Snipe

• Proper Table Alignment: Ensure that the infeed and outfeed tables are perfectly aligned with the planer bed.
• Consistent Pressure: Maintain consistent downward pressure on the board as it enters and exits the planer.
• Sacrificial Boards: Use sacrificial boards to support the workpiece at the beginning and end of the cut.

Uneven Thickness

• Check Cutterhead Alignment: Ensure that the cutterhead is parallel to the planer bed. Misalignment can cause the board to be thicker on one side than the other.
• Verify Table Coplanarity: Confirm that the infeed and outfeed tables are coplanar.
• Consistent Feed Rate: Maintain a consistent feed rate throughout the cut.

Burning

• Increase Feed Rate: Burning occurs when the board is fed too slowly, causing the blades to dwell in one spot. Increase the feed rate to prevent this.
• Reduce Depth of Cut: Taking too deep of a cut can also cause burning. Reduce the depth of cut and make multiple passes.
• Clean Blades: Resin buildup on the blades can cause friction and burning. Clean your blades regularly with a blade cleaner.

Motor Overload

• Reduce Depth of Cut: Taking too deep of a cut can overload the motor. Reduce the depth of cut and make multiple passes.
• Sharpen Blades: Dull blades require more power to cut, which can overload the motor. Sharpen or replace your blades.
• Check Power Supply: Ensure that the planer is receiving adequate power. Use a dedicated circuit if necessary.

Safety Considerations

Safety should always be your top priority when operating a planer. Here are some essential safety precautions to follow.

Wear Safety Gear

• Eye Protection: Always wear safety glasses or a face shield to protect your eyes from flying debris.
• Hearing Protection: Planers are loud machines, so wear earplugs or earmuffs to protect your hearing.
• Dust Mask: Wear a dust mask or respirator to prevent inhalation of sawdust.

Follow Safe Practices

• Never Reach Over the Planer: Avoid reaching over the planer while it is running. If you need to adjust the board, turn off the machine and wait for the cutterhead to stop spinning.
• Use Push Sticks or Push Pads: Use push sticks or push pads to feed short or narrow boards. This keeps your hands away from the cutterhead.
• Never Plane End Grain: Planing end grain can cause severe tear-out and potential kickback. Use a specialized end-grain planing technique or a different tool.
• Keep the Area Clear: Keep the area around the planer free of obstructions and debris.
• Disconnect Power for Maintenance: Always disconnect the power cord before performing any maintenance or adjustments.
• Know Your Machine: Read and understand the manufacturer's manual before operating the planer.

Advanced Techniques

Once you have mastered the basic techniques, you can explore some advanced methods for achieving even better results.

Skewing the Board

• Reducing Tear-Out: Slightly skewing the board as it enters the planer can change the angle at which the blades engage with the wood fibers, reducing tear-out. This technique is particularly useful for woods with interlocking grain.

Planing Thin Stock

• Using a Sled: When planing thin stock, it can be difficult to maintain consistent pressure and prevent the board from flexing. Use a sled made from plywood or MDF to support the workpiece. Attach the thin stock to the sled with double-sided tape or clamps.

Planing Wide Boards

• Multiple Passes: Wide boards may require multiple passes to achieve a consistent thickness. Overlap each pass slightly to avoid leaving ridges.
• Support Rollers: Use support rollers or extension tables to provide adequate support for wide boards.

Planing Curly or Figured Wood

• Shallow Cuts: Curly or figured wood is prone to tear-out. Take extremely shallow cuts (1/64 inch or less) to minimize this risk.
• Sharp Blades: Ensure that your blades are razor sharp.
• Backing Board: Use a backing board to support the wood fibers and prevent tear-out.

Maintenance

Regular maintenance is essential for keeping your planer in good working condition and ensuring optimal performance.

Blade Maintenance

• Sharpening: Sharpen your planer blades regularly to maintain a clean cut. Use a sharpening jig or send the blades to a professional sharpening service.
• Replacement: Replace your blades when they become too dull or damaged to sharpen.
• Cleaning: Clean your blades regularly with a blade cleaner to remove resin and pitch buildup.

Machine Maintenance

• Lubrication: Lubricate the moving parts of the planer regularly with a light machine oil.
• Cleaning: Clean the planer regularly to remove sawdust and debris.
• Belt Inspection: Inspect the drive belt for wear and tear. Replace the belt if necessary.
• Roller Maintenance: Clean the feed rollers to ensure they maintain a good grip on the board.

Conclusion

Feeding boards into a planer correctly is a fundamental skill for any woodworker. By understanding the planer's mechanics, preparing the wood properly, and executing the feed with precision, you can achieve smooth, consistent results and ensure the longevity of your machine. Remember to prioritize safety at all times and to troubleshoot any issues that arise. With practice and attention to detail, you can master the art of planing and elevate the quality of your woodworking projects.