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Build step 02 / 05 ~2 min read

at the endThe head on the arm: ten screws, every one into a servo, servos 5 and 6 as pan and tilt.

How it goes together

One print, two servos you already own, ten screws, every one into a servo.

Six steps

  1. Handle off. Unscrew the trigger handle from servo 5. Servo 6 comes out with it. Keep the four horn screws.

  2. Yoke onto servo 5. The Ø24 boss sits on the horn, the four horn screws go in from above.

    Yoke onto servo 5's horn

  3. Servo 6 into the yoke. Horn toward the wall, disc into the 22 mm bore, body on the two ribs. Four M2 × 4 self-tap through the wall into the tabs.

    Servo 6 lowered into the yoke

  4. Body onto servo 6. Two M2.5 × 5 down the shafts at ±7 mm, driven through the open top.

    Body onto servo 6's horn

  5. Nicla in, lid on. Board through the lid face, USB edge toward the open top, lens out; it slides under the two lips. Lens through the cone, ToF in the window, press the lid until it clicks. No screws.

    Nicla into the body Lid pressed until it clicks

  6. Power and calibrate. Micro-USB from the arm's supply, cable along the servo bus. Then strands-arm calibrate.

    The assembled head

Screws

Horn joints take M2.5 × 5 only: the thread is 2.5 mm deep behind a 3 mm flange. Longer screws bottom out early.

What done feels like

The board slides in by hand. Servo 6 drops into the yoke with no force and does not rock. The lid clicks once; the USB sits 0.31 mm proud so the cable seats. Tilt clears the yoke by 9.74 mm over its full mechanical ±90°; the guard uses ±60°.

Every fit is measured against STS3215_03a.step and NiclaVision.step by hardware/cad/fitcheck_*.py. Next: calibrate.