RobotShop M100RAK V4 Modular Robotic Arm Kit (No Electronics)

RobotShopSKU: RB-Rbo-85
Manufacturer #: M100RAK-V4

Price  :
Sale price ¥106,811

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Included in this bundle


  • 4x - Hitec HS-785HB Winch Servo Motor
  • 4x - Servo Gearbox Frame (43mm Width, for Large Size Servos)
  • 8x - Flanged Ball Bearing (32mm ID x 39mm OD, 5mm Thickness)
  • 2x - 32mm ID Spacer (36mm OD, 4mm Length) - 2 Pack
  • 4x - Aluminum Flanged Tube (28mm ID x 32mm OD, 39mm Length)
  • 2x - goTUBE (192mm Length)
  • 1x - goTUBE (96mm Length)
  • 6x - 1-Side, 2-Post Clamping Mount (32mm Bore)
  • 4x - Thru-Hole Clamping Hub (32mm Bore)
  • 4x - U-Channel (1 Hole, 48mm Length)
  • 1x - 4mm ID Spacer (6mm OD, 16mm Length) - 4 Pack 
  • 1x - Aluminum Baseplate (6mm Thickness, 144mm Diameter)
  • 4x - Brass, MOD 0.8, Servo Gear (25 Tooth Spline, 12 Tooth)
  • 4x - Aluminum, MOD 0.8, Hub Mount Gear (32mm Bore, 108 Tooth)
  • 1x - Low-Side U-Channel (3 Hole, 96mm Length)
  • 1x - 3-Pos TJC8 Servo Extension (MH-FC to FH-MC, 600mm Length)
  • 1x - 3-Pos TJC8 Servo Extension (MH-FC to FH-MC, 900mm Length)
  • 1x - Zinc-Plated Steel Socket Head Screw (M4 x 0.7mm, 18mm Length) - 25 Pack
  • 1x - Zinc-Plated Steel Socket Head Screw (M4 x 0.7mm, 35mm Length) - 25 Pack
  • 3x - Zinc-Plated Steel Socket Head Screw (M4 x 0.7mm, 8mm Length) - 25 Pack
  • 1x - Zinc-Plated Steel Washer (4mm ID x 8mm OD) - 25 Pack
  • 1x - Zinc-Plated Steel Nylon-Insert Locknut (M4 x 0.7mm, 7mm Hex) - 25 Pack
  • 1x - 2.5mm Hex L-Key
  • 1x - 3mm Hex L-Key
  • 1x - 7mm Combination Nut Driver
  • Bottom of base to shoulder axis: 110mm (~4.33in)
  • Shoulder axis to elbow axis: 276mm (~10.87in)
  • Elbow axis to wrist axis: 276mm (~10.87in)
  • Maximum horizontal reach: 640mm (~25.20in)
  • Maximum vertical reach: 750mm (~29.53in)
  • Weight: 1.96Kg

RobotShop M100RAK Robotic Arm Kit Dimensions

  • Four degrees of freedom using Hitec 785HB servo motors
  • All aluminum frame with ball bearing support
  • Servo casing is water and dust tight and features Karbonite gears and ball bearings 
  • 9:1 gears increase torque of each servo motor by a factor of 9 
  • Operating voltage: 4.8 to 6V (6V suggested for maximum torque). 
  • Current: 1.5 to 1.8A per motor depending on voltage used. 
  • Angular range per joint: 140 degrees
  • Weight: 1.96Kg (not including electronics or gripper / end-effector)


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