Flat Milling with a Router

Step-by-Step Guide to Face Milling Wood
Whether you’re a beginner or an experienced woodworker, every detail matters when face milling wood. With a router and a face milling attachment, you can level and smooth even large workpieces. In this guide, you’ll learn what options are available without a planer or jointer and how to tackle even challenging projects. We’ll show you which tools you need, walk you through the process step by step, and give you practical tips for achieving a clean, even finish.

Flat Milling a Beam with a Router

Face Milling on the RUWI-lifting table

Navigation

• How does face milling work?
• Preparation
• Instructions
• Machine Selection
• Tool Selection
• Face Milling Fixtures
• FAQ

Key Facts at a Glance

• Choosing the right tools is crucial: Select the correct router bit and a compatible router, along with an effective dust extraction system.
• Preparation pays off: Thoroughly prepare the workpiece, the face milling fixture, and the safety precautions.
• Technical Notes: Pay attention to the milling direction and speed to minimize tear-outs and improve surface quality.
• Don't forget the finishing touches: Check the surface, sand it, and protect it if necessary (for example, with oil, wax, or varnish).

How can I use a router to plane a surface?

In face milling, the top surface of a wooden workpiece is machined using a router and a special face milling cutter to make it smooth and level. This is an alternative to using a planer or a jointer, especially for larger workpieces such as tree slabs, epoxy resin tables, or solid wood panels.

Finished workpiece after face milling

Preparation: What do I need for face milling?

To ensure that your face milling goes smoothly, you should not only set aside some time for preparation but also have the necessary materials and tools on hand. The following list will give you a general idea:

List of Materials

• Workpiece (for example, a solid wood cutting board, a tree slice, or an epoxy resin table)
• Vacuum cleaner or extraction system
• Dust mask and safety goggles
• Sturdy work table or workbench

Tools

• Clamping claws or positioning aids
• Face mill (appropriate diameter)
• Face Milling Device
• High-Performance Handheld Router or Rod Router

Instructions: Face Milling with a Router

Here, we'll show you, step by step, how to plane uneven solid wood workpieces. Using a router, a suitable bit, and a planing jig, you'll achieve precise results.

Step 1: Selecting Tools

Choose a router and a router bit that are suitable for your project and material. Commonly used face milling cutters have two or three cutting edges and a diameter between 30 mm and 40 mm. Larger ones (up to 50 mm) are also available, but they require very powerful routers. A professional face milling jig that we recommend is the SlabMatrix from sautershop.

Festool Router in Detail

Are you looking for a sturdy, height-adjustable base for your face milling jig? This RUWI lifting tables fit underneath.

Step 2: Prepare the machine and tool

Check the router and router bit for damage or wear. Insert the face mill into the collet up to at least the mark and tighten it securely. Pay attention to the preset speed and ensure that it never exceeds the router bit’s maximum speed. Then attach the machine to your face milling jig, if provided.

Note: Caution—sharp tool edges. Wear gloves when assembling, if necessary.

Step 3: Prepare the face milling fixture

Make sure your face milling jig is securely mounted on the work surface. Check the height and alignment so that the router maintains the desired cutting depth as it glides over the workpiece. Remove dust and debris from the guides. If your jig is adjustable, adjust it to fit the size of the workpiece. A properly adjusted jig prevents vibrations and ensures consistent results.

Facing a tree pit with clamping devices

Step 4: Prepare the workpiece

Use a sturdy workbench and, if necessary, a non-slip mat. Align the workpiece and shim it if it wobbles. Clamp it securely using clamps, clamping jaws, or eccentric clamps. If working with reclaimed wood, check for nails, screws, or other foreign objects to prevent damage and safety hazards.

Height Adjustment of the Router on the SlabMatrix

Step 5: Planing the wood

Start at the highest point of your workpiece. Move the router in straight lines at a steady pace. If possible, route in the opposite direction. If a section has already been planed, you can lower the router bit by 2 to 3 mm and continue until the entire surface is flat. Do not remove too much material in a single pass to avoid overloading the machine.

Effective Dust Extraction During Face Milling

Tip: You can learn more about synchronous and counter-rotating operation in the encyclopedia article on milling processes.

Note: Face milling usually produces a lot of wood dust. Use a dust extraction system and wear a dust mask.

Step 6: Finishing the Wood

Check the surface for milling marks and any irregularities. Then sand it with 100- to 150-grit sandpaper, followed by 220-grit or finer. Thoroughly remove the sanding dust before treating the surface with oil, wax, varnish, or stain. This will give the workpiece the necessary protection and a beautiful finish.

Machine Selection

Choosing the right machine is a crucial factor in achieving precise face milling results. Common options:

• Handheld router: Suitable for a wide range of tasks. Models with variable speed can be adjusted for different materials. For many woodworkers, they cover most of their routing needs.
• Roller planers: Often sturdily built and powerful, designed for large wood panels or hardwoods. Height adjustment is typically controlled solely by the planer itself.

RUWI-Motor for the rod milling machine

Tool Selection

• Two or more cutting edges: Fewer cutting edges are suitable for moderate material removal, while more cutting edges are better for large surfaces and fast work.
• Fixed-blade cutters or indexable-insert cutters: Fixed-blade carbide cutting edges are often less expensive, but must be sent out for sharpening. Indexable-insert cutters allow for easy turning or replacement of worn cutting edges.
• Shaft diameter: Common sizes are 8 mm, 10 mm, and 12 mm. Make sure it's compatible with your router.
• tool diameter: Face mills range in diameter from 25 mm to 50 mm. The larger the diameter, the more power and stability the milling machine requires.

Always choose a milling tool that is appropriate for the scope of your project and the specifications of your machine.

Face Milling Fixtures

Face milling fixtures are the key to precise and consistent face milling. There are various types:

• Simple surface milling jigs: For DIYers or small projects. They provide basic guidance for the router but are usually suitable only for smaller workpieces.
• Professional surface milling tables: For demanding or commercial applications. Sturdy construction, integrated dust extraction, precise height adjustment, and, where applicable, adjustable stops. Suitable for larger workpieces and highly precise surface milling.

SlabMatrix at the " RUWI" -lifting table

The decision between a simple DIY solution and a professional surface milling table depends on your needs, your budget, and the level of precision you want.

Learn more in the Woodworking Encyclopedia: Face Milling

FAQ

What is face milling?

Surface milling is a woodworking technique in which a router, a suitable surface milling cutter, and a surface milling jig are used to mill the surface of pieces of wood until it is flat and smooth. This allows for the removal of unevenness and the achievement of precise thicknesses.

Which router is suitable for face milling?

A router suitable for face milling should be powerful enough to drive larger face milling cutters and feature precise depth adjustment. Variable speed is helpful for adapting to different materials. Ergonomic design and effective dust extraction improve working comfort.

How can I prevent tear-outs during face milling?

Route preferably along the grain of the wood, use a sharp router bit, and adjust the speed accordingly. If necessary, place a splinter block to support the exit edge. This will minimize unsightly tear-outs.

Do I need a special face milling fixture?

Yes, a face milling jig is necessary to precisely control the milling depth and remove material from the workpiece evenly. It ensures reliable results and prevents unwanted vibrations or misalignment.

Which face mill is best for my project?

That depends on the material, the desired surface finish, and how often you'll be using it. Milling cutters with indexable inserts are easier to replace when they wear out. Be sure to check the shank diameter, cutter diameter, and the maximum speed of your router.