22mm template guide for inclusions with Makita RT0702 trimmer + templates + centering cones

The template guide provides a 22mm sleeve through which the trimmer bit passes, allowing use of the trimmer with template patterns.

The original Makita template guide has a 10mm sleeve, allowing a perfect match with the 22mm template guide, when using a 6mm trimmer bit.

With the appropriate template, using the 10mm guide and the 6mm bit, will make the bit cut between two lines, located at 2mm and 8mm from the template. With the same template, using the 22mm guide and the same 6mm bit, will make the bit cut between two lines located at 8mm and 14mm from the template. Then, perfect matching carving can be done with one template, one 6mm trimmer bit and two different template guides: 10mm in order to shape one piece of wood to fit tight inside a hole that is to be made in another piece of wood using the 22mm tempate guide.

Use any template as long as minimum radius is 11mm. A couple template examples are included here, those can be used to add reinforcements to a board that may split if nothing is done. Note that I included a male template so it can be printed fast and then transferred to a wood female template (with the 10mm template guide)…

For more details on template guides and templates, I found these videos of French youtubers https://www.youtube.com/watch?v=m8Z2tNDgmSg https://www.youtube.com/watch?v=DQPUKqM167Y https://www.youtube.com/watch?v=UB3M_6NDns8 https://www.youtube.com/watch?v=wtoOzNcJqwI 

For template trimming it is extremely important that: 

1. your guides are well centered
2. your guides fit tight into the trimmer base
3. your guides have precise external diameters

In order to deal with #1, I included two centering cones, one that doesn't fit through the 22mm guide hole and another one that fits with a small gap that you can visually assess. Feel free to use one, the other or both so your 22mm template guide is well centered before installing the 6mm bit. You may want to scale the centering cones in Z if you are milling deep.

In order to deal with #2 and #3, if your printer is super precise, you will not need any adjustment, but if your prints are some 10th of mm off, the inclusions will not fit right. In that case, print a first template guide and test for fit to the trimmer, then measure the guide diameter, if they are “equally off”, you just need to scale your next print to get the good dimensions. If they are off by different amounts, I recommend you to :

1. open the template guide in PrusaSlicer
2. cut the piece in two parts (NOT two objects) horizontally at Z=2,4mm
3. scale each part to the required dimension in each direction
4. make sure there is no gap between your parts, if there is one, lower the upper part as required

In case you do not have the original 10mm template guide, I included one as well. You may need to make that one fit precisely too, for seamless inclusions.

These are very simple yet useful drawings to make precise inclusions with the Makita trimmer, so I also left here the Blender file with the guides, the centering cones and the tempates… feel free to use them and remix them for your milling needs.

Happy printing and great inclusions!