Decided to build CNC for cutting full sheets of plywood mainly (because any CNC does it better than I do 
) thus the size. 2500mmx1250mm working area.
Milled ALU side plates (I apologize for not ordering from Ryan, overseas shipping costs an arm and a leg).
Printed all parts using my old slow Ender 3. All tubes are heavy 25x3mm steel ones. After a bit of thinking I’ve decided to connect both sides of the CNC above X gantry to make most of the wiring fixed (the only ones which move are X axis and 220v). Firmware is pretty much unchanged, only adjusted drivers setting, current and Zmax and inversed few steppers settings using firmware config because for me it was easier than redoing connectors etc.
Hit the issue with failing Z-axis and very hot drivers (TMC2225) so printed custom box which looks ugly but includes fan for cooling and soldered in 1k resistors for endstops. Box should be redone (as well as ad-hoc plywood cable channel holder but I’ve got laser cutter and it was Quick&Dirty way of prototyping)
and cable management needs some love but in general… It works!
First cut (not counting endless number of “air cuts”) done today LowRider v3 first cut - YouTube and safe settings look too … safe
Of course first issue appeared. Apparently I got “ramp” setting of Fusion 360 wrong which leads to way too deep cut (ramp distance + material thickness) as the result ply was cut through without holding tabs (second mistake is too shallow tabs which ended up in the wasteboard because of this) internal piece separated and… well LR and the bit survived but additional unplanned cut appeared in the struct Now I know the bit can survive 10 mm depth cut in one pass…
Another strange thing is this:
For some reason the “internal” line has been cut at depth around 3mm . I thought it because of skipped steps of something like that but then it continued using normal path… Looks like yet another ramping magic, not sure what I’ve enabled ramp in the settings for thought but it was not a good idea.
