Makita (DRT50) router circle jig

When looking for inspiration to create a Makita (DRT50) router circle jig, I noticed that all the designs I found are limited by the footprint and size of the printer used.

I also found requests from people asking for the option of a bigger diameter.

I don't want to claim such a design is not out there, I probably just didn't find it myself...

This was an incentive for me to work out a solution that is only limited by the length of the metric threaded rod you have available, or the excess flex a long M8 rod would introduce.

As long as the latter stays within acceptable limits, you could even extend what you have available to gain extra diameter using M8 coupling nuts...

You cannot avoid a hole in the center with this (kind of) design(s), but I tried to limit it to a diameter of 3 mm since that is sufficient.

Hardware needed to complete this design:

• M8 threaded rod at your preferred length

• Centerpiece

  • An M3 bolt you insert in the middle of the centerpiece (length of your own choosing), with whatever head type you can drive from the top (slotted, Phillips/Pozidriv, hex/torx) with a small head diameter up to 6 mm, but you can adjust this in the file or just carefully drill it to a bigger size after printing) - you will need to drive the bolt in with a little force but that's by intention to keep it firmly in place

  • One standard M8 nut for adjusting the rod length

  • One counter-nut (preferably with a washer) to fix the diameter once set

• Router attachment

  • Two self-locking nuts (preferably with washers on the print sides), to ensure a tight fit while still allowing the rod to rotate freely

  • The attachment to the router base itself is done with the original screw of the router base

I created the design in Fusion 360 and added included it so you can adapt it if desired.

I printed this design in ASA, because I wanted to test it in very sunny weather without the print getting soft, but PLA would work as well if you work indoors or out of the bright sun.

I used an infill of 20% and 5 vertical perimeters / 5 horizontal solid layers (both top and bottom), with no supports needed. As such, the print is very solid, but slice at your own discretion.

Although the design isn't inspired by it, I would like to mention "eraser2704" (https://www.thingiverse.com/thing:4261736) since I made use of the router attachment (V) plane in their design.

This allowed me to take over some measurements as a basis rather than making the effort of measuring it myself, although I made some small adjustments afterwards since I had to file away some minimal thickness. I'm sure this isn't linked to the design itself, but rather to my (old) printer.

I sincerely hope this contribution can be of help for those who see added value in it.

Enjoy!