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Liftbar.md

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Liftbar dock

A motorized crossbar - compatible with Trident and V2.

For up to 3 toolheads (2 docked), a single motor is sufficient. For more, I recommend two motors.

Details image

BOM

2020 Extrusion:

  • 279mm long for 250mm build
  • 329mm long for 300mm build
  • 379mm long for 350mm build

XY Idlers:

  • 2x 20mm 5mm shaft
  • 4x heatset inserts
  • 4x 8mm m3 screw
  • existing pulleys

Common:

  • Omron d2f endstop switch
  • ~4m 6mm GT2 belt (for 350 size)
  • m3 bolts, heatset inserts, nuts
  • 8x 8mm m4 bolts, t-nuts
  • 8x F623RS flanged bearings (voron 0 spec)

Voron 2.4:

  • 2x MGN9H rails, same length as your Z rails

Voron Trident:

  • 2x MGN9H rails, 210mm+

For Single motor:

  • nema 17 motor
  • 36mm 5mm shaft
  • 2x 625 bearing (voron 2 spec)
  • 20T GT2 idler
  • 20T GT2 pulley
  • 2x 5x1mm washers

For dual motor:

  • 2x nema 17 motor
  • 2x 36mm 5mm shaft
  • 4x 625 bearing (voron 2 spec)
  • 2x 20T GT2 pulley
  • 4x 5x1mm washers

Assembly

  • Assemble and replace the the XY idlers
  • Install the Top idlers
  • Install the linear rails, make sure they clear the XY idlers
  • Install endstop
  • Assemble and connect the gearboxes
  • Assemble the gantry
  • Install the belt
  • Adjust the belt so that the gantry is ~horizontal
  • Tension the belt
  • Test the lifbar movement

Work in progress...

Gearbox

The assembly sequence is a bit tricky.

  • First mount the gears - small on the stepper axis and large on the pulley. Use the grubscrews in reverse to tighten the large gear. The small gear is just friction fit.
  • Then install the m3 screws for the motor, do not mount the motor yet.
  • Then press fit in the rear bearing, this needs quite some force, use a rod or hex wrench through the front hole to push it in.
  • Install the Left side M4 screw, but not the right one.
  • Install the big gear, this is a bit tricky:
    • Push in the shaft through the bearing from back, have it extend 1mm inside.
    • Place the washer on the shaft
    • Push the gear assembly down from above, it's a right fit, but should go in without much force.
    • Push the shaft all the way through
    • Add the second washer and bearing.
  • Install the motor, test if the gears mesh smoothly
  • Install the remaing 2 M4 screws.

Cross cut vs Trident leadscrew:

Gearbox 0

Top down, test fitting the Motor, remove the motor to install the large gear. Gearbox 1

Finished, ready to be mounted:

Gearbox 1

Docks

Gearbox

Configuration

See toolchanger-lifbar.cfg in Klipper folder.