Bigger 3d Printer mean bigger MFT dilling jig

[Francis_Beland]

With my little printer, I was just able to make 4 holes drilling jig. I recently received a Bambu Lab X1C with a build surface of 256mmX256mm and I was able to make 9 holes MFT drilling jig. I'm really happy for the quality but also the speed of that printer. On my first model, I did a forstner drill bit guide but not all forstner bits are created equal so it's not really interesting. By concentrating on only plunge router hole boring, it's a little easier. My question is any of you drilled their MFT top using other boring bit than the Festool one? I see other companies like Amana, Bosch or CMT that sells 20mm boring bit but most of them have 10mm shank. Can I use a 1/2 inch to 10mm collet on a router and use that bit to drill?

I looked at another thread here and the CMT 392.200.11 bit has been recommended (with 8mm shank). Do you have any other one?

Thank you

 

[smorgasbord]

This seems like the kind of thing that a home CNC machine could also make. Including larger (18" square for many machine) and even out of materials like phenolic or aluminum. I have a Shapeoko Pro that should be capable of making these.

I'm a newbie with Autodesk Fusion, but given some parameters I'm sure I could whip something up. I like the idea of using a router with a bushing, and so sizing the holes in the template to fit the bushing. In which case, the material could be something cheap like MDF or plywood or most plastics.

For repositioning the jig, do you all just use 20mm dowels/bench dogs in previously drilled holes? I would think that might be the area where accuracy falls off. Again, another reason for a larger jig with more holes. I was also thinking that if you have two jigs you could make something that would position the second jig relative to the first jig (using the holes or machining some kind of key in the edges), and then you could leapfrog those across your MFT top.

What accuracy tolerance are MFTs manufactured to? What is needed?

 

[Crazyraceguy]

Freud makes a 20mm bit too. The one I have is 1/4" shank. I bought it on a whim, thinking I would use it to do my MFT with a CNC template, like I did the first time.
I ended up getting the Parf system and didn't use it, until about 2 weeks ago. It just happened to be the right thing at the right time.

 

[nicholam77]

I used the Bosch 20mm boring bit + an Amana 10mm --> 1/2" collet adapter. Worked fine in my DeWalt router, although the bit shank isn't super long, so 3/4" material is about all it can handle (at least with my plunge router).