Circle Router Jig

When you're routing a hole or recess and want precision, freehanding is not an option. CNC routing may work, but takes a lot of preparation for a one-time cut - so your best option may be a router jig!

Rectangles

ToolInfoBox Rectangle Router Jig

Synonyms:	adjustable rectangle routing template
Type:	guidance jig
Used with:	clamps, TX 30 key or screwdriver; router, copying rings (optional)
Location:	next to router table
Access Requirements:	read this page
Tutors:	Lukas

We have some very handy flat aluminum extrusions that Lukas saved from the trash because of their jig potential: they can interlock with each other at 90 degrees at any length!

Before assembly, you will need to calculate the desired inside measurement. This depends on the way you'll use it:

using a router within the jig:
- inside_(jig) = inside_{(hole/recess)} + router base diameter - router bit diameter
- advantages: maximum depth usable, corner radius = bit radius
- disadvantage: large enough workpiece area needs to be availabe (easier with a palm router), router bases are usually not evenly round

using a router with copying ring on top of the jig
- please double-check, not tested! inside_(jig) = inside_{(hole/recess)} + copying ring diameter - router bit diameter
- advantages: even guidance no matter how you turn the router, also works close to the workpiece's edge
- disadvantages: harder to clamp down loss of routable depth, only possible if copying ring is flatter than the jig

Then, make sure to clamp the jig down securely before starting your cut and you'll get great results!

Future Improvements

it would be very handy to keep a dedicated Torx key in the same place as the jig
maybe we could add precise rulers for easier setup - e.g. glued on or engraved somehow?
the jig should be marked so potential users find this page ;-)

Circles

small circle jigs may be included with some routers, let's check and add them here!

self-built options: look for "circle routing jig" or "Fräszirkel" online!