Ok, y’all scared me off…So I threw out the conduit idea and made this! It uses the 660top1.stl and 660bot1.stl from Ryan’s standard DW660 mount on Thingiverse http://www.thingiverse.com/thing:944952 These are the parts that bolt to the standard MPCNC tool mount. I designed new 660top2 and 660bot2 brackets so they would hold the pipe and nozzle. The new parts will be called 660top2_vacpipe.stl and 660bot2_vacpipe.stl respectively.
The nozzle is from a design on Thingiverse by Csatti at http://www.thingiverse.com/thing:536091 It has been scaled to 84% from the original design so the 3/4" pvc fits tight when printed with PLA. BTW, I printed the nozzle WITHOUT any support on my MK2!!! Amazing!
The nozzle height in the photo allows for a 10.5mm depth of cut with the 1/8" shank bits that have the depth collar properly set at .800". I think I can get another 5mm with a redesign of the lower bracket, but right now I’m not motivated. The lower bracket already requires a little support when printing, and such a change will require even more…sorry Ryan!
I also removed the “Tool Free” collet collar and replaced it with a cover I designed. The collar was bulky and clunky and just got in my way. I now just use a 5/8" wrench. This was inspired by pictures and video from Barry.
I also need to design the vac hose adapter that goes on the top of the pvc pipe. I just happened to have one that fit, so I’ll revengeneer it.
I’m not quite finished. For one, the PVC is too long (same leverage problem as conduit idea). Once I decide on a vac hose I will cut it accordingly. Looking at bilge hose for that… http://www.gandermountain.com/modperl/product/details.cgi?pdesc=1-1/8-Bilge-Pump-Hose-per-foot&i=23604
When I am totally finished, I will pack all the parts together and put them in a zip file and post it here.