// ============================================================ // motor_bracket.scad — NEMA 14/17 Stepper Motor Mount // TM-VCAP-ENC-003 Rev A // Mounts stepper motor co-axially to capacitor shaft // Fits NEMA 14 (35.2mm face) and NEMA 17 (42.3mm face) steppers // Shaft coupler: 5mm motor shaft to 4/6/8mm cap shaft (configure below) // Print: PETG, supports on motor pocket only // ============================================================ $fn = 64; // ---- Configuration ---- MOTOR_TYPE = "NEMA14"; // "NEMA14" or "NEMA17" // NEMA 14 params NEMA14_FACE = 35.2; NEMA14_HOLE_SPACING = 26.0; // 4× M3 holes on 26mm square pattern NEMA14_BOSS_DIA = 22.0; // pilot boss diameter NEMA14_BOSS_H = 2.0; // pilot boss protrusion NEMA14_SHAFT = 5.0; // motor shaft diameter // NEMA 17 params NEMA17_FACE = 42.3; NEMA17_HOLE_SPACING = 31.0; NEMA17_BOSS_DIA = 22.0; NEMA17_BOSS_H = 2.0; NEMA17_SHAFT = 5.0; // Cap shaft params (match cap frame design) CAP_SHAFT_DIA = 6.0; // 4 for VC-QRP/VHF, 6 for VC-HF100, 8 for VC-TX CAP_BOSS_DIA = 12.0; // matches cap frame motor boss OD // Bracket dimensions PLATE_T = 5.0; // mounting plate thickness PLATE_W = 70.0; // for NEMA17; adjust to NEMA14_FACE+20 for NEMA14 PLATE_H = 70.0; SPACER_H = 20.0; // distance motor face to cap frame; room for coupler COUPLER_OD = 19.0; // rigid shaft coupler OD (off-shelf, 5mm→6mm) COUPLER_L = 25.0; // coupler length COUPLER_BORE_MOTOR = NEMA14_SHAFT + 0.1; // motor shaft bore COUPLER_BORE_CAP = CAP_SHAFT_DIA + 0.1; // cap shaft bore // Motor face params (active) FACE = (MOTOR_TYPE == "NEMA14") ? NEMA14_FACE : NEMA17_FACE; HOLES = (MOTOR_TYPE == "NEMA14") ? NEMA14_HOLE_SPACING : NEMA17_HOLE_SPACING; BOSS_D = (MOTOR_TYPE == "NEMA14") ? NEMA14_BOSS_DIA : NEMA17_BOSS_DIA; BOSS_H = (MOTOR_TYPE == "NEMA14") ? NEMA14_BOSS_H : NEMA17_BOSS_H; M_SHAFT = (MOTOR_TYPE == "NEMA14") ? NEMA14_SHAFT : NEMA17_SHAFT; module motorFacePlate() { difference() { // Main plate translate([-PLATE_W/2, -PLATE_H/2, 0]) cube([PLATE_W, PLATE_H, PLATE_T]); // Motor pilot boss clearance translate([0, 0, -1]) cylinder(h=PLATE_T+2, d=BOSS_D+0.5); // Motor shaft clearance translate([0, 0, -1]) cylinder(h=PLATE_T+2, d=M_SHAFT+2); // Motor mounting holes: 4× M3 for (sx = [-1,1], sy = [-1,1]) { translate([sx*HOLES/2, sy*HOLES/2, -1]) cylinder(h=PLATE_T+2, d=3.2); } // Corner mounting holes (bracket to chassis): 4× M3 for (mx = [-1,1], my = [-1,1]) { translate([mx*(PLATE_W/2-6), my*(PLATE_H/2-6), -1]) cylinder(h=PLATE_T+2, d=3.2); } // Lightening pockets for (sx = [-1,1]) { translate([sx*(FACE/4 + 5), 0, 1]) cylinder(h=PLATE_T-2, d=10); } } // Pilot boss recess (negative: fits over motor boss) // This is a ring that locates the motor; motor boss goes into this difference() { translate([0, 0, 0]) cylinder(h=BOSS_H+PLATE_T, d=BOSS_D+0.5+2*3); // ring OD translate([0, 0, -1]) cylinder(h=BOSS_H+PLATE_T+2, d=BOSS_D+0.5); // ring ID = boss clear } } module standoffs() { // 4× standoff posts from motor plate to cap frame mount for (sx = [-1,1], sy = [-1,1]) { translate([sx*(PLATE_W/2-6), sy*(PLATE_H/2-6), PLATE_T]) difference() { cylinder(h=SPACER_H, d=8); translate([0, 0, -1]) cylinder(h=SPACER_H+2, d=3.4); // M3 through } } } module capMountPlate() { // Mating plate that attaches to capacitor frame motor boss translate([0, 0, PLATE_T + SPACER_H]) difference() { translate([-PLATE_W/2, -PLATE_H/2, 0]) cube([PLATE_W, PLATE_H, PLATE_T]); // Cap motor boss socket (press-fit or loose) translate([0, 0, -1]) cylinder(h=PLATE_T+2, d=CAP_BOSS_DIA+0.3); // Cap shaft clearance translate([0, 0, -1]) cylinder(h=PLATE_T+2, d=CAP_SHAFT_DIA+1); // Mounting holes for (mx = [-1,1], my = [-1,1]) { translate([mx*(PLATE_W/2-6), my*(PLATE_H/2-6), -1]) cylinder(h=PLATE_T+2, d=3.2); } } } module rigidCoupler() { // One-piece 3D-printed shaft coupler (for non-critical alignment applications) // For precision use: aluminum jaw coupler (off-shelf) translate([0, 0, PLATE_T + PLATE_T + SPACER_H - COUPLER_L/2 + 2]) difference() { cylinder(h=COUPLER_L, d=COUPLER_OD); // Motor shaft bore + set-screw groove translate([0, 0, -1]) cylinder(h=COUPLER_L/2 + 1, d=COUPLER_BORE_MOTOR); // Cap shaft bore translate([0, 0, COUPLER_L/2 - 1]) cylinder(h=COUPLER_L/2 + 2, d=COUPLER_BORE_CAP); // Set screw holes (M3): motor side and cap side translate([COUPLER_OD/2, 0, COUPLER_L/4]) rotate([0, 90, 0]) cylinder(h=COUPLER_OD, d=2.5); translate([COUPLER_OD/2, 0, COUPLER_L*3/4]) rotate([0, 90, 0]) cylinder(h=COUPLER_OD, d=2.5); // Alignment slit (makes it slightly flexible for minor misalignment) translate([-0.5, -COUPLER_OD/2-1, COUPLER_L/2-5]) cube([1.0, COUPLER_OD+2, 10]); } } // ---- Render all parts ---- motorFacePlate(); standoffs(); capMountPlate(); rigidCoupler(); // Label translate([0, PLATE_H/2 + 0.1, PLATE_T/2]) rotate([90, 0, 0]) linear_extrude(0.4) text(str("MOTOR BRACKET ", MOTOR_TYPE, " TM-VCAP-ENC-003"), size=2.5, halign="center", valign="center"); // ---- BUILD NOTES ---- // Print orientation: motor face plate flat on bed; standoffs print vertical // For NEMA14 on VC-QRP: coupler 5mm motor → 4mm cap shaft // For NEMA17 on VC-HF100: coupler 5mm motor → 6mm cap shaft // For VC-TX: use NEMA17 with coupler 5mm → 8mm; add flex jaw coupler for alignment // After print: drill M3 through holes to clean; tap coupler set-screw holes M3 // Align motor shaft and cap shaft concentrically before tightening standoff screws // Misalignment >0.5mm will cause shaft wobble and plate-to-plate contact — CHECK!