Last Update: 11jun99 Torque, Rate and Step Calculations: Need to lift 200 lbs, about 3 ft. If using a 6" diameter (1/4 ft radius) spindle, that's 50 ft-lbs. The unit which seems to occur in the stepping motor catalogues is oz-in, so 50 ft-lbs becomes 50*12*16= 9600 oz-in, or, say: 10 000 oz-in. 625 in-lbs. Need to gear down a 100 oz-in motor by 100:1 Need to gear down a 200 oz-in motor by 50:1 Need to gear down a 300 oz-in motor by 33:1 Need to gear down a 480 oz-in motor by 21:1 Need to gear down a 600 oz-in motor by 17:1 ==> Cut ratio in half if using 2:1 pulley lifter: 5 000 oz-in. 313 in-lbs. Need to gear down a 100 oz-in motor by 50:1 Need to gear down a 200 oz-in motor by 25:1 Need to gear down a 300 oz-in motor by 17:1 Need to gear down a 480 oz-in motor by 11:1 Need to gear down a 600 oz-in motor by 9:1 Rate should vary from 0 to 3 ft. in no more than 1 minute: Lifting rate, L Max motor rotation rate, R Gear ratio, G Spindle Radius, r L = R/G * 2 pi * r ==> R = L*G/(2*pi*r) e.g., for G = 48, r = 3", L = 3 ft/min: R = 3 ft/min * 48 / (6.28*3") R = (36 in/min)/(18.85 in)*48 = 92 / min R > 92 RPM ==> Double rate if using 2:1 pulley lifter. R > 184 RPM Minimum step should be about 1/10 mm. Minimum Linear Step, L Gear ratio, G Step Angle, S (degrees) Spindle Radius, r L = (S/360)*2*pi*r/G ==> S = L*G/(2*pi*r)*360 ==> Double minimum step if using 2:1 pulley lifter. e.g., for G = 21, r = 3", L = 1/10mm: S = 0.1mm*21/(6.28*3")*360 = (0.01cm/7.62cm) * (21/6.28) * 360 = 1.58 degrees. e.g., for G = 48, r = 6", L = 1/10mm: S = 0.1mm*48/(6.28*6")*360 = (0.01cm/15.24cm) * (48/6.28) * 360 = 3.16 degrees. Braking Clutch: Servo Systems Co. 1999-2000 800-922-1103 Probably way too small: Dynamic Inst. Corp. Model DMCSB-13-2A or Autotronics MC-10-16 Brake-Clutch p145 Coil 24 VDC, 160 mA 1.250" dia by 1.620". Input gear flange hub 0.500" dia. Output shaft is a Split Hub with Clamp to accept a 0.125" dia shaft. De-energized: Input gear flange free, output shaft braked to housing. Energized: Brake released, Input gear flange clutched to output shaft. Stock No. PC-123 $18.50 Gearheads: Servo Systems Co. 1999-2000 800-922-1103 Size 42 (NEMA), Inline Spur, p 33, available in ratios from 3:1 to 10 000:1 Output shaft size: 1.50" long, 1.25" dia, 505 Woodruff key. Shaft Loading: 250 lbs. radial, 300 lbs. axial. Weight: 6.2 lbs. Torque Rating: 500 in-lbs continuous, 1000 in-lbs max. Manufacturer: Applied Motion Products. "Call for pricing" Paragon Size 34, Double Stage Planetary Gearhead, p 35, available in ratios: 16, 22, 28, 40, 49, 55, 70 and 100:1. Output shaft size: 1.50" long, 0.75" dia, 808 Woodruff key. Shaft Loading: 300 lbs. radial, 300 lbs. axial. Weight: 8 lbs. Torque Rating: 750 in-lbs continuous, 975 in-lbs max. 34 Eliminator Planetary Gearhead, p38 Part # 34EP049 Ratio: 49:1 Torque: 1067 in-lbs continuous, 1500 RPM Output shaft size: 1.5" long, 0.75" dia, 3/16" by 0.60" keyway. Weight: 9.68 lbs, Length: 4.063", plus shaft. Width: 3.25". Stepper Motors: Servo Systems Co. 1999-2000 800-922-1103 Size 34: p 25. To order double shaft, add "D" to end of part number, plus $4.00. Leads are 18", shaft is 1.19" long, 0.750" dia. Part # 5034-350 Length: 5.1" Holding Torque: 472 oz-in 8 leads Step angle: 1.8 $233.85 Volts: 2.5 Amps: 5.90 Ohms: 0.42 mH: 2.6 Rotor inertia: 10.2/1870 (oz-in^2/G-CM^2) Weight: 7.70 lbs. Needs gear-ratio of 21:1 to lift 200 lbs. Part # 4034-331 Length: 3.7" Holding Torque: 300 oz-in 6 leads Step angle: 1.8 $160.00 Volts: 2.5 Amps: 4.60 Ohms: 0.55 mH: 2.76 Rotor inertia: 6.72/1230 (oz-in^2/G-CM^2) Weight: 5.40 lbs. Needs gear-ratio of 21:1 to lift 200 lbs. Direct Drive: Model: MT232-06 p 14 160 oz-in/1.13 N-m $205.00 Motors: Geared: Model: LYMC-62700-661 p 41 480 oz-in, 12 V, 1.023 A, 3.73 RPM Stock: BC-114 $114.00 Model: CYHC-42700-661 p 42 480 oz-in, 12 V, 0.696 A, 3.19 RPM Stock: BC-109 $122.00 Temperature Controller: Omega 99 Volume E CN72133-PV2 p P113C in-hand Stepper Motor Driver/Controller: Servo Systems Co. 1999-2000 800-922-1103 Panther LI $695.00 -RM (rack mount option) $59.00 Input Voltage 120 VAC Drive Current 0.4 to 3.0 Amps (per phase) Motor Speed 0 - 6 000 RPM Inputs (General Purpose): 3 (0 to +5 VDC) Inputs (Dedicated Inputs - Go, Jog +, Hog -, Jog Speed, Soft Stop): 5 (0 to +15 VDC) Outputs (General Purpose): 3 (0 to +5 VDC) Quickstart (Software) $49.00 PC (486 should be adequate): To run Quickstart on. Allan Bradley: May sell whole system. "PLC"