As promised, I did some more measurements of flex, backlash and belt tension. Unless otherwise noted, I used the maslow.yaml with my manual frame measurement and z of the router was so that the distance between the top of the sled’s honeycomb structure and the bottom of the plastic around the linear guide bushings was 43mm.
All numbers are differences between moving left and right or up and down, respectively.
Jogging in x:
- 0.4mm x-deflection, vertical post, upper end
- 0.02mm x-deflection, vertical post, lower end
- 0.4mm x-deflection, vertical guide rod, upper end
- 0.35mm x-deflection, vertical guide rod, just above the linear bushing
- 0.3-0.35mm x-deflection, linear guide bushing, upper end
- 0.15mm z-deflection, linear guide bushing, upper end
- 0.15mm x-deflection, linear guide bushing, lower end
- 0.35mm x-deflection, on the sticker of the router (drawn on the opposite side on the image below, because of the BR motor in front of the router’s sticker)
- 0.5-0.7mm x-deflection, PCB cover on top of the router
- backlash (sled, not router bit): 1.25mm
Jogging in y:
- 0.2-0.25mm y-deflection, upper end vertical post
- 0.35-0.4mm y-deflection, router, just above power switch
- backlash (sled, not router bit): 2.5mm
Belt tension:
Belts were extended approximately 2300mm. I put a straight edge parallel to the belt. Then I pulled the belt horizontally with 2 Newton force, in the middle of the belt. This yielded the following horizontal displacements of the belt:
- 26mm (one of the “pulling” belts after jogging in x-direction)
- 42mm (one of the “trailing” belts after jogging in x-direction)
Same setup but using the maslow.yaml with the frame dimensions based on the automatic calibration:
- 10mm (one of the “pulling” belts after jogging in x-direction)
- 13mm (one of the “trailing” belts after jogging in x-direction)
