Trend Router Sub-Bases & Guide Bushings for Template Accuracy
Router sub-bases and guide bushings (also called router bushes or template guides) work together to make template routing accurate, repeatable and far easier to control. A sub-base can increase the router’s footprint for better stability on narrow stock and edges, while a guide bushing lets the router follow a template edge with a consistent offset from the cutter. This combination is ideal for pattern routing, hinge and lock recessing, inlay work, and any job where you want the same result every time.
Guide bushings sit in the router base (or sub-base) and run against a template or jig. Because the bushing diameter is larger than the cutter, it creates a predictable “stand-off” that controls the final cut size. Many woodworkers prefer bush-based template routing because it keeps the cutter safely away from the template edge, reduces the chance of nicking the jig, and makes it easier to achieve consistent results across multiple components.
FAQs
What are guide bushings used for on a router?
Guide bushings allow a router to follow a template or jig accurately. The bushing runs along the template edge while the cutter removes material at a consistent offset, making them ideal for repeatable recesses, openings and joinery features.
Do I need a router sub-base to use guide bushings?
Some routers accept guide bushings directly, but many require a compatible sub-base or adaptor plate. A sub-base can also improve stability and visibility, which is helpful when doing detailed template work.
Why is centring the guide bushing important?
If the bushing isn’t centred to the cutter, the cut will be inconsistent as you move and rotate the router, causing uneven edges or incorrect sizing. A centring cone/alignment tool helps ensure the bushing and cutter are concentric.
What’s the advantage of a larger sub-base?
A larger sub-base improves stability and reduces tipping when routing near edges or on narrow workpieces. This can lead to smoother profiles, cleaner recesses, and better control during template routing.
Are guide bushings better than bearing-guided cutters?
They’re different tools for different jobs. Bearing-guided cutters are quick and simple when the bearing can ride on the work or a template. Guide bushings excel when you need a controlled offset, want to protect a template edge, or need to use a jig designed specifically for bushes.
Can I use guide bushings for hinge and lock recessing?
Yes. Many hinge and lock jigs are designed around guide bushings because they deliver consistent placement and clean edges. With the correct cutter and bushing size, you can rout accurate, repeatable recesses with minimal layout time.
Will fitting a sub-base change my router’s depth settings?
A sub-base adds thickness under the router, so you’ll reset depth as you normally would. What matters most is that the sub-base sits flat, is securely mounted, and the bushing is centred for consistent template work.