Step 1

Parts required:

• 1x AF3s unit
• 1x 3D printed 16T MXL pulley

Put the pulley onto the shaft in the same manner as demonstrated on the photo.

Slide the pulley onto the shaft, so the end of the shaft is flush with the top surface of the pulley. Tighten the set bolts carefully.

Step 2

Parts required:

• 1x RedCat/SpaceCat/WhiteCat

Take the telescope out of its ring.

Step 3

Parts required:

• 1x v2 ring
• 1x AF3s unit
• 2x 8mm M4 low head profile bolts

Open the AF3s unit by undoing the 2 M3 bolts.

Take the circuit shell off and carefully unplug the motor from its port.

Take the motor out of the motor shell.

Insert M4 bolts into the enclosure.

Hold the bolts in with your fingers from inside the enclosure, so they do not fall out.

Keep on holding the bolts on the inside of the enclosure. Place the enclosure onto the ring with bolts aligned to the holes. Pay attention to the direction of enclosure in relation to the dovetail orientation.

Tighten M4 bolts by inserting the wrench into the holes above the bolts.

Insert the motor back into the enclosure. Secure the motor with 4x 6mm M3 bolts.

Carefully connect the motor to the circuit port. Pay attention to the orientation of the connector.

Close up the motor and secure the circuit shell with M3 bolts.

Step 4

Parts required:

• 1x v1 ring with AF3s connected
• 1x RedCat/SpaceCat/WhiteCat
• 1x 3D printed helical focuser MXL ring
• 2x 10mm M3 bolt

Put the telescope back into its ring and tighten it.

Put the female part of 3D printed ring onto the helical focuser with teeth facing the back of the telescope. The teeth must be in line with the teeth on the pulley of the motor.

Put the male part of 3D printed ring onto the female part and insert 2x M3 bolts.

Tighten the bolts alternately just so the bolt grabs onto the thread in the female part of the ring. After both bolts are connected, tighten them down so the teeth on the joint are aligned.

Step 5

Parts required:

• 1x RedCat/SpaceCat/WhiteCat with mounted AF3s & ring
• 1x MXL timing belt

Slide the timing belt onto the telescope from the front.

Put the belt over the ring.

Attach the belt to the pulley.

Start attaching pulley to the ring. Work by going through the length of the belt gradually. Some force should be required.

• if you can put the belt on too easily, there is not enough tenison. Try putting 1mm spacer plate under the motor enclosure.
• if you cant get the belt onto the ring, there is too much tension. Check if you used any spacer plates. If you did, remove them.

Step 6

Test the motor with manual hand controller/AF3 control panel or 3rd party program via ASCOM.

• if the pulley does not grab onto the teeth and rotates freely, the belt is too loose. Return to the step 5.
• if the motor is stalling and can't move the helical ring, the belt is too tight or the motor move current is too low. To change belt tightness, return to the step above. To increase the motor move current, see FAQ for details.

Try racking the telescope all the way in/out to test all positions. If you can, also turn the telescope facing upwards and try racking it out, as this is the position which requires the most force.

Step 7 (optional)

Parts required:

• 1x RedCat/SpaceCat/WhiteCat with assembled AF3s
• 1x 3D printed v2 ring guide scope shoe
• 4x 10mm M3 bolt

Place the guide scope shoe to the top of the AF3s enclosure and align it with 4 holes on the both sides of AF3s enclosure.

Attach the guide scope shoe with 4x M3 bolts.

Use 2x 16mm M3 bolts to attach the guide scope in the shoe.

Step 1

Parts required:

• 1x AF3s unit
• 1x 3D printed 16T MXL pulley

Put the pulley onto the shaft in the same manner as demonstrated on the photo.

Slide the pulley onto the shaft, so the end of the shaft is flush with the top surface of the pulley. Tighten the set bolts carefully.

Step 2

Parts required:

• 1x RedCat/SpaceCat/WhiteCat

Take the telescope out of its ring.

Step 3

Parts required:

• 1x v1 ring
• 1x AF3s unit
• 2x 8mm M4 low head profile bolts
• 1x 3D printed 2mm spacer plate

Open the AF3s unit by undoing the 2 M3 bolts.

Take the circuit shell off and carefully unplug the motor from its port.

Take the motor out of the motor shell.

Insert M4 bolts into the enclosure.

Hold the bolts in with your fingers from inside the enclosure, so they do not fall out.

At bottom of the encousure, slide 2mm spacer plate onto the M4 bolts.

Keep on holding the bolts on the inside of the enclosure. Place the enclosure onto the ring with bolts aligned to the holes. Pay attention to the direction of enclosure in relation to the dovetail orientation.

Tighten M4 bolts by inserting the wrench into the holes above the bolts.

Insert the motor back into the enclosure. Secure the motor with 4x 6mm M3 bolts.

Carefully connect the motor to the circuit port. Pay attention to the orientation of the connector.

Close up the motor and secure the circuit shell with M3 bolts.

Step 4

Parts required:

• 1x v1 ring with AF3s connected
• 1x RedCat/SpaceCat/WhiteCat
• 1x 3D printed helical focuser MXL ring
• 2x 10mm M3 bolt

Put the telescope back into its ring and tighten it.

Put the female part of 3D printed ring onto the helical focuser with teeth facing the back of the telescope. The teeth must be in line with the teeth on the pulley of the motor.

Put the male part of 3D printed ring onto the female part and insert 2x M3 bolts.

Tighten the bolts alternately just so the bolt grabs onto the thread in the female part of the ring. After both bolts are connected, tighten them down so the teeth on the joint are aligned.

Step 5

Parts required:

• 1x RedCat/SpaceCat/WhiteCat with mounted AF3s & ring
• 1x MXL timing belt

Slide the timing belt onto the telescope from the front.

Put the belt over the ring.

Attach the belt to the pulley.

Start attaching pulley to the ring. Work by going through the length of the belt gradually. Some force should be required.

• if you can put the belt on too easily, there is not enough tenison. Go back to step 3 and add 1mm spacer plate while attaching the enclosure to the ring.
• if you cant get the belt onto the ring, there is too much tension. Try taking out a spacer plate.

Step 6

Test the motor with manual hand controller/AF3 control panel or 3rd party program via ASCOM.

• if the pulley does not grab onto the teeth and rotates freely, the belt is too loose. Return to the step 5.
• if the motor is stalling and can't move the helical ring, the belt is too tight or the motor move current is too low. To change belt tightness, return to the step above. To increase the motor move current, see FAQ for details.

Try racking the telescope all the way in/out to test all positions. If you can, also turn the telescope facing upwards and try racking it out, as this is the position which requires the most force.

Step 7 (optional)

Parts required:

• 1x RedCat/SpaceCat/WhiteCat with assembled AF3s
• 1x 3D printed v1 ring guide scope shoe
• 2x 10mm M3 bolt

Place the guide scope shoe to the side of the AF3s enclosure and align it with 2 holes on the enclosure.

Attach the guide scope shoe with 2x M3 bolts.

Use 2x 16mm M3 bolts to attach the guide scope in the shoe.