Pan-tilt držák kamery pro dvě serva SG90

Inženýrské kontroly

Názvy kontrol a parametrů pocházejí přímo z CAD enginu a jsou anglicky.

• ✓Tilt servo has the torque8.44 N.mm worst case (24.8 g cradle + cap + 10 g board, CG 1.1 mm off the axis at up to 60 deg = 0.26, plus starting a full-speed move with all mass at the 28 mm sweep radius = 8.18) vs SG90 stall 177 N.mm: under a quarter
• ✓Pan servo has the torque15.43 N.mm to start a full-speed pan (66 g turning, I = 368 g.cm2) vs 177 N.mm stall
• ✓Yoke stays on the pan horn1.3 N pull on a horn screw (turning group CG 3.8 mm off the pan axis, bumped x2, levered over 8 mm) vs ~40 N for an M2 self-tapper 2.5 mm into PLA, derated; the horn is also keyed into its recess for torque
• ✓Pivot stub carries a knock0.10 MPa bending at the 6 mm stub root (half the cradle at a 5 g knock, sharp-root factor 2.3) vs 16.7 along the layers; bearing 0.03 MPa vs ~5 MPa for PLA sliding
• ✓Arms take a 5 N knock at the top2.3 MPa at the 4.3 x 28 mm arm root (39 mm tall, bending across the layers) vs 5.0
• ✓Tilt SG90 seats in the arm windowcase 0.2 mm clear in the window, tabs flat on the arm, two M2 tab screws; horn keyed 2.0 mm into the cradle recess; overlap 0.00 mm3
• ✓Pan SG90 hangs on its tabs in the basetabs on the pocket ledge with two M2 screws, horn keyed into the yoke floor; overlap 0.00 mm3
• ✓Cradle is trapped between stub and horncradle can float 0.6 mm toward the stub: the stub stays 3.1 mm in its bore and the horn stays 3.0 mm on the spline; no glue
• ✓Board slides in and is heldPCB edges 0.7 mm deep in 1.9 mm grooves with 45 deg lead-ins, 0.3 mm side play, lifts at most 0.3 mm under the cap; header pins reach through two back windows; overlap 0.00 mm3
• ✓Tilt sweep is clearcradle, cap and board sampled every 10 deg: clear to +/-180 deg (no contact at all; the SG90's own +/-90 deg is the limit); set range +/-60
• ✓Pan sweep is clearyoke, tilt servo and cradle sampled at +/-45 and +/-90 deg against the base: overlap 0.00 mm3; 0.8 mm seam under the yoke
• ✓Leads route clear, exit low at the backpan lead in the drop-in slot under the base; tilt lead snaps into a groove round the yoke rim, crosses in a service loop and snaps into a groove down the back of the base; both leave at the back within 6 mm of the desk; tightest bend 7.0 mm (>= 6 mm, 5x the 1.2 mm ribbon it bends across); overlap 0.00 mm3
• ✓Tilt lead has slack for the whole pan96 mm free loop vs 91 mm needed at 90 deg (worst of +/-90): wrapped round the base at 36 mm radius, plus the drop and 15 mm spare
• ✓Tilt lead is long enough240 mm from the servo to 25 mm past the back exit (12 mm behind the base) vs the 250 mm SG90 lead
• ✓Stands steady without screws or tapetips only past 53 deg (203 g, CG 27 mm up, 1.3 mm off centre, 74 mm foot)
• ✓pan SG90 + horn goes in23 poses along its path clear of every part.
• ✓tilt SG90 + horn goes in16 poses along its path clear of every part.
• ✓ESP32-CAM board goes in26 poses along its path clear of every part.
• ✓OV2640 camera + lens goes in26 poses along its path clear of every part.
• ✓driver: tilt tab screws goes in20 poses along its path clear of every part.
• ✓driver: cap screws goes in20 poses along its path clear of every part.

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