How to Use a Router Guide Bushing for Template Routing

By Premium CNC & Router Bits for Precision Cutting | Published: 2026-10-23

Category: How-to Guides

Learn step-by-step how to set up and use a router guide bushing with templates for precise, repeatable cuts. Includes tips on centering and choosing the right bushing.

Quick answer

Use a router guide bushing to follow a template accurately by mounting the bushing to the router base and centering the bit inside it. The Whiteside W-9540-38N is a reliable choice for precision work.

Why use a guide bushing instead of a bearing bit

A router guide bushing lets you follow a template that is offset from the bit, so you can use any straight or pattern bit without needing a bearing. This is useful when your template must be smaller than the final cutout, or when you want to reuse the same bit for multiple template sizes.

The main trade-off is setup time: you must center the bushing precisely on the router base, and the cut offset equals half the difference between the bushing OD and the bit diameter. With a bearing bit, the offset is zero but you are limited to bits with matching bearings.

Step-by-step setup and routing

Mount the bushing to the router base: Remove the sub-base plate, place the bushing into the recessed hole, and secure it with the retaining nut. Tighten just enough to hold it firmly — overtightening can warp thin bushings. Check that the bushing sits flush with the base; an uneven mount will cause binding or wobble.
Center the bit inside the bushing: Install the centering pin (often supplied with the bushing) into the collet, lower the router until the pin fits snugly into the bushing’s ID, then lock the plunge. Tighten the base screws while the pin holds alignment. If no centering pin is included, use a 1/4″ dowel or a transfer punch — off-center bits shift the cut line by the error distance.
Calculate the cut offset: Measure the bushing OD and the bit diameter. The offset from the template edge equals (bushing OD − bit diameter) ÷ 2. For the Whiteside W-9540-38N with a 1/4″ bit: (0.375 − 0.250) ÷ 2 = 0.0625″ offset. Account for this when sizing your template. Always subtract twice the offset from your final part dimension to determine template size — forget this and your cutout will be oversize.
Secure the template and workpiece: Clamp the template firmly to the workpiece with at least three clamps spaced around the pattern. Use double-sided tape for small parts. The bushing must ride against the template edge without any gap. A loose template shifts mid-cut and ruins the pattern — check for movement before starting.
Make the cut: Start the router at full speed, then lower the bit into the workpiece away from the template. Traverse the bushing along the template edge in a climb-cut direction for cleaner edges (where safe with hand-held routers). Feed at a steady pace — too fast burns the wood, too slow chatters. Never force the router sideways; let the bushing guide the motion. If the bushing binds, stop and check for debris or a tight template corner.
Finish and inspect: Once the cut is complete, lift the router clear before stopping the motor. Remove the workpiece and check for a uniform offset gap. If the bushing left burn marks or the offset varies, recenter the bit and adjust feed rate. After multiple passes, blow out dust from the bushing ID — buildup can throw alignment off by thousandths.

Product reference

Whiteside W-9540-38N Template Guide Bushing – 9/32″ID, 3/8″OD: Solid brass construction, 9/32″ ID and 3/8″ OD, includes bushing and lineup pin. Made in USA. The solid brass build resists wear, and the included lineup pin simplifies centering on your router base — critical for symmetrical cuts.
Whiteside W-9540-38N Template Guide Bushing – 9/32″ID, 3/8″OD