TopBox Technical Manual

Mechanical Components

[ Table of Contents ]
< Optical Design ] [ Construction Drawings >

  • Filter Wheel Assembly
    • Stepper Motors (2)
      Motor Model: Oriental ASM66AAE-H50 (Vexta)
      (AS=AS Series, M=motor only, 6=motor size 60 mm (2.36 in) square, 6=motor length, A=standard motor type (no electromagnetic brake), A=power input Single-phase 110-115 V, E=motor identification, H=harmonic gear, 50=gear ratio)
    • Drive Mechanism (Coaxial Shafts)
      • Timing Belts (2): Berg TB20EF6-105
        Max-M-Drive, 3/8 wide, neoprene, 21.00 length, 105 pitches at 0.200 pitch
      • Driving Pulleys (2): Berg TP20A6W6-20
        Max-M-Drive, .3750 bore, 3/8 belt, double flange
        20 teeth, 1.50 FD, 1.273 PD, 7/8 long, 15/16 hub diam
      • Driven Pulleys (2): Berg TP20A6W6-30
        Max-M-Drive, .3750 bore, 3/8 belt, double flange
        30 teeth, 2.13 FD, 1.910 PD, 29/32 long, 1-5/16 hub diam
      • Large Bearings (2) (outer shaft, FW1): Berg B1-21
        52100 Chrome Steel, Shielded, Unflanged
        d=1.000, D=2.000, W=.500, B=.031
      • Small Bearings (2) (inner shaft, FW2): Berg B11-11-6
        52100 Chrome Steel, Shielded, Unflanged
        d=.3750, D=.8750, W=.281, B=.016
      • Inner Shaft: Berg S6-60
        Ground 303 Stainless Steel, 3/8" (0.3740) diameter, 6" length
      • Inner Shaft Retainers (2): McMaster-Carr 91590A117
        External snap ring for 3/8" shaft, stainless steel
      • Outer Shaft:
        Aluminum Tubing, 1" OD, 3.5" length, 0.25" wall thickness
      • Outer Shaft Retainers (2): McMaster-Carr 91590A133
        External snap ring for 1" shaft, stainless steel
  • Autoguider Assembly
    • Linear Actuator
      Model: Oriental EZlimo EZSM3D010MA
      (EZS: EZS II Series, M: motorized linear slide only, 3: Width 54 mm (2.13 in), Height 50 mm (1.97 in), D: Lead 12 mm (0.47 in), 010: Stroke 100 mm (3.94 in), M: Has electromagnetic brake, A: Single-phase 100-115 V)
      Orientalmotor EZlimo Catalog (pdf)
    • Shaft Hanger Assembly
      • Linear Pillow Block Assembly with Shaft Wipers: Berg LPW-2A
        3/8 shaft size
      • Replacement Shaft Wipers: Berg LMG-R-2
      • Shaft: Berg S6-80
        Ground 303 Stainless Steel, 3/8" (0.3740) diameter, 8" length
    • Focuser
      • JMI Custom Event Horizon 2" Focuser
        Part Number: EVB, Product Description Code BN25DPRMEZZ
        Options:
        Build Your Own (custom version): B
        Newtonian (generic flat) base, mounting holes spaced 2.75 in square: N
        2.5 in Drawtube Length: 25
        Dual Speed Drive (0.064 in and 0.58 in per knokb rev : D
        Pusher Bearing (8 lb. capacity): P
        Rubber-Gripped Gold Knobs (required w/dual-speed drive): R
        Motor Control: M
        First Output Adapter for 1.25 in Eyepiece: E
        Second Output Adapter None: Z
        Illumination Upgrade: None Z
      • JMI Encoder and Mounting Hardware for EV focuser
        Part Number: DROEV
        EV Focuser Manual (pdf)


Last modified: Nov 15, 2012
David McDavid

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