Hello!
I haven’t had the opportunity to cut big thinks on the last 2 monts but recently a customer asked me to cut him an archtop molding jig, that is basically made with multiple layer of MDF.
I really was excited to do that since I had recently found that my belt tension was uneven on both Y axis, so I bought a digital fish-scales and managed to set a proper and equal belt tension on both Y axis.
Following the @PhilJohnson advice of some week back I setted the belt tension between 3.5/4lb (is lb the correct term?) using a scale and raising the belt of 1 inch in the middle with the carriage all backwards using @RobertA_Rieke video as reference. I think I have pretty much setted an equal tension on both axis, I could have a tollerance of 0.5lb (holding the fish scale and a rule at the same time isn’t easy lol).
I also setted the X axis belt tension to 4lb, thinking that it only have 1 motor to work so a little bit of “force” on the pulley could be better.
Of course I have then re-calibrate all the stepper.
Anyway, I did the cut of the molding jig and basically all went perfect, since the customer asked me if could cut him some small template, and here come the problems: On the X axis the lenght of the templates was dead perfecet (420mm on the project and 420mm on the cut), BUT on the Y axis it miss 0.9/1mm! Also circles went little bit oval on a side (pretty much on 14 'o clock if I remember well).
When I have made the stepper calibration, I had a dead results on both X and Y (using a 600mm rule and a .48mm bit).
I cutted using a new router bit, 3mm depth per passes, 1100mm/h feeding. Mod on the machine is 30min X axis mod, eccentric nut mod, v-wheels mod, Z axis mod. 1000x1000 machine with dewalt 611, pot current setted. I think I have all setted up well since I recently re-built the machine because I had a not square waste-board that now I think is mm+/mm- okay.
Any thought? I’m starting to loose faith on have correct size/dimension cut, since I need to start cut hard wood soon I’m really worried about.
Thanks!