TUTORIAL DUAL CONCENTRIC ROTARY ENCODER

By Nonolight An easy way to build a dual concentric rotary encoder using the Opencockpit's gray-type 3T7 encoders http://www.opencockpits.com/catalog/encoder-p-100.html?cPath=24_58

What you need : -2 3T7 Encoders -1 2.5mm brass rod -1 4 mm external diameter / 3 mm internal brass cylinder tube -1 heat-shrinkable -1 stop ring What you get : A 3 Function dual rotary encoder With optional switch

STEP 1

Here are the two encoders :

Saw the axis of both encoders at the basis :

Using a screwdriver, disassemble carefully :

You'll need a 2.5mm drill to modify these 2 parts below :

Drill the brown part to enlarge the hole up to 2.5mm :

Drill the white part too but with an horizontal movement to obtain an oval hole :

Take the 4/3 mm brass tube:

File both sides of the tube to create a notch :

STEP 2

Adjust the brass tube on the white drilled part:

Reassemble the first encoder :

The switch function of that encoder is lost :

STEP 3 Now modify the second encoder, keeping only the remaining parts shown on the picture :

the switch function of the second encoder is optional !

Take the 2.5mm brass rod :

Using a hammer flatten the end of that rod by this way it will fit easily in the white part hole :

For the switch you'll have to file the end of the rod to obtain a small 1.5-2.0mm maximum diameter cylinder :

STEP 4

Then, reassemble the second encoder and take the stop-ring :

Mount the ring on the rod and screw it to stop. Be careful ! Too near of the end the switch will not work. Too far it will be loose.

Cut the heat-shrinkable tubing :

Insert the 2.5mm rod into the first encoder :

Put the heat-shrinkable tubing on the rod and warm to shrink it :

Reassemble the brass tube in the first encoder and plug the second encoder on the axis from behind :

STEP 5 Using a iron-wire tie the 2 encoders firmly together avoiding any electrical contact with the pins when bending the wire :

Here's the result:

This tutorial as been translate by Bob (Stevelep) and Claude (Razmott)

Visit us at :

Forum : AIR-COCKPIT http://air-cockpit.superforum.fr/index.htm , the Forum of the french cockpit builders

Nonolight My link : NONOLIGHT

http://nonolight.free.fr/simulateurs/index.html