Another small update.

I've now ordered the Hi-Tec HS-325HB Servos to drive the rotation of each target.

Specifications as below. I think with a 6V power supply they should be fast enough to be well within the 0.3 seconds to turn requirements of the ISSF rules. Although this target is for 10m and not 25m.

Control System: +Pulse Width Control 1500usec Neutral
Required Pulse: 3-5 Volt Peak to Peak Square Wave
Operating Voltage: 4.8-6.0 Volts
Operating Temperature Range: -20 to +60 Degree C
Operating Speed (4.8V): 0.19sec/60° at no load
Operating Speed (6.0V): 0.15sec/60° at no load
Stall Torque (4.8V): 42 oz/in (3.0 kg/cm)
Stall Torque (6.0V): 51 oz/in (3.7 kg/cm)
Current Drain (4.8V): 7.4mA/idle and 160mA no load operating
Current Drain (6.0V): 7.7mA/idle and 180mA no load operating
Dead Band Width: 5usec
Operating Angle: 40 Deg. one side pulse traveling 400usec
Direction: Clockwise/Pulse Traveling 1500 to 1900usec
Motor Type: Cored Metal Brush
Potentiometer Drive: 4 Slider/Direct Drive
Bearing Type: Top Ball Bearing
Gear Type: Heavy Duty Karbonite
360 Modifiable: Yes
Connector Wire Length: 11.81" (300mm)
Dimensions: See Schematics
Weight: 1.52oz (43g)


The target holder was tricky. But in the end I decided that I may as well just use a proven design. So I have ordered 5 of the Rika holders that are used on their World Champion target changers.

http://www.schiesssport-buinger.de/Z...ben--1170.html

It should be reasonably easy to just bolt these onto the servo arms with some 2 or 3mm nuts and bolts.

Thanks

Mark