This guide has more recent changes. Switch to the latest unverified version.

SatNOGS Rotator v3 Mechanical Assembly

Written By: Pierros Papadeas (and one other contributor)
  • Comments: 19
  • Favorites: 1
  • Completions: 2

Difficulty

Moderate

Steps

20

Time Required

Suggest a time??

Sections

1

Flags

0

Introduction

Notes:

*Some of the pictures in this guide are from previous versions of the rotator.

  1. In this step we are constructing the frame. You will need 4x T slot 20x20 L160, 9x T slot 20x20 L102, 20x Hidden corner connection slot 6. Start by assembling using a 2mm Allen key.

    • In this step we are constructing the frame.

    • You will need 4x T slot 20x20 L160, 9x T slot 20x20 L102, 20x Hidden corner connection slot 6.

    • Start by assembling using a 2mm Allen key.

    • Beware of the correct hidden corner connection orientation.

    • You can find the assembly diagram on the next step.

    • If you purchased square nuts that only fit into the slot from the end, be sure to insert them before assembling the frame with the hidden corners.

    Edit

    While this and other instructions describe the lengths as L160 and L102, the 3.1 diagram here https://wiki.satnogs.org/File:C1050.png and the BOM specify L140 and L100 respectively. Which is correct?

    Bruce Robertson - Reply

  2. You should now have a complete frame. Make sure you dont fasten the holding connectors for the extra L102 beam on one side.

    • You should now have a complete frame.

    • Make sure you dont fasten the holding connectors for the extra L102 beam on one side.

    • Beware of the orientation (short side vs long side) of the hidden corners!

    Edit

  3. For this step you will need: 3D printed: Axis side with homing sensor (older version shown in the picture), Axis side, 2x Ball bearing housing 8x M4-20 screws, 8x M4 nuts

    • For this step you will need:

    • 3D printed: Axis side with homing sensor (older version shown in the picture), Axis side, 2x Ball bearing housing

    • 8x M4-20 screws, 8x M4 nuts

    • 2x Ball Bearing 6008ZZ

    • Insert the 8 nuts in the pockets of the axis sides.

    • Attach the ball bearing housings on the back of each axis side and fasten it with M4-20 screws as shown.

    Edit

  4. Finally, place the ball bearings inside the pockets created.

    • Finally, place the ball bearings inside the pockets created.

    Edit

  5. In this step you will need: 1x side assembly (the one without the homing sensor holder) 4x M4 slot 6 nuts, 4x M4-10 bolts

    • In this step you will need:

    • 1x side assembly (the one without the homing sensor holder)

    • 4x M4 slot 6 nuts, 4x M4-10 bolts

    • Screw the M4-10 bolts through the side assembly as shown on the second picture and attach the M4 slot 6 nuts

    • Finally slide the whole piece inside the frame as shown (bottom side touching the frame) and secure it by screwing the 4 M4-10 bolts.

    Edit

  6. In this step you will need: 3D Printed: Worm gear Thread lock glue

    • In this step you will need:

    • 3D Printed: Worm gear

    • Thread lock glue

    • 2x M5 nut, 1x M5 washer (wrong in the picture), 90mm M5 threaded rod

    • Apply glue as shown.

    • Follow the diagram for the dimensions.

    Edit

  7. In this step you will need: The previous worm gear assembly. 3D Printed: Worm mount

    • In this step you will need:

    • The previous worm gear assembly.

    • 3D Printed: Worm mount

    • 2 ball bearings 625ZZ

    • 4x M4 nut slot 6, 4x M4-10 screws, 2x M4 washer.

    • Insert the ball bearings inside the pockets of the mounts. Then screw the bolts into the nuts slot6 as shown in the pic.

    • Finally slide the worm mounts in the slot 6 rails as shown. First the one without the gear assembly first, then the second with the gear assembly as shown.

    • Don't forget the washers between the ball bearings and the worm gear assembly.

    Edit

  8. In this step you will need: The second axis side assembly (the one with the homing sensor holder)

    • In this step you will need:

    • The second axis side assembly (the one with the homing sensor holder)

    • 2x M4 slot6 nuts, 2x M4-10 bolts

    • 2x M4 slot6 nuts, 2x M4-20 bolts

    • The motor mount.

    • Attach the bolts, slot 6 nuts and the stepper motor mount.

    • Finally attach the whole assembly to the frame as shown in the picture.

    Edit

  9. In this step you will need: 3D printed: Axis spacer collar

    • In this step you will need:

    • 3D printed: Axis spacer collar

    • 3x M3 nut, 3x M3-10 set screws

    • Insert the nuts in the pockets of 3d printed part, then screw the set screws as shown.

    Edit

  10. You will need: The homing ring part 1x M3 nut, 1x M3-25 bolt.

    • You will need:

    • The homing ring part

    • 1x M3 nut, 1x M3-25 bolt.

    • One small piece of aluminum tape (or something that blocks the IR light)

    Edit

  11. Insert the M3 nuts to axis gear part. Pass the axis through: Axis collar spacer

    • Insert the M3 nuts to axis gear part.

    • Pass the axis through:

    • Axis collar spacer

    • Homing ring

    • Axis gear

    • Axis spacer

    Edit

    Just to be more clear, in the second picture the order of the pieces from left to right doesn’t match the description. It’s just a minor note.

    Alfredo - Reply

  12. Ensure that the distance from the tube to the frame is approximately 54mm as shown in the first image. Tight all screws on axis gear part.

    • Ensure that the distance from the tube to the frame is approximately 54mm as shown in the first image.

    • Tight all screws on axis gear part.

    • Apply some silicone grease on the axis gear and use a power drill to slowly run the worm gear for a couple of minutes in both directions .

    Edit

    In this picture, the motor is mounted on its mount, but in the previous phase is not present. It would be better to add a phase for the motor mounting.

    Alfredo - Reply

    To be done before mounting the pulley on the worm gear

    Alfredo - Reply

  13. In this step you will need: 4x M3-6 and 4x M3 washers NEMA 17 stepper motor

    • In this step you will need:

    • 4x M3-6 and 4x M3 washers

    • NEMA 17 stepper motor

    • GT2 pulley 20 T 5mm bore and GT2 pulley 36 T 5mm bore (not shown on the first picture)

    • Pass the small pulley through the stepper motor shaft and the larger through the worm shaft.

    • Place the motor under the mount and tighten the screws.

    Edit

  14. In this step you will need: 3x M3 nuts 4x M3-6 Head cap screws

    • In this step you will need:

    • 3x M3 nuts

    • 4x M3-6 Head cap screws

    • 3x M3-12 Head cap screws

    • 3D printed part motor_mount_flange

    • GT2 pulley 20 T 6mm bore and GT2 pulley 36 T 5mm bore (not shown on the pics)

    • Bolt the motor on the flange

    • Insert the small pulley over the motor shaft and the larger through the worm shaft. Bolt the flange, with the motor, on the motor base.

    Edit

  15. Loose the screws on the hidden corners in a way that stepper motor can slide towards the worm gear. Place the the GT2 timing belt 158mm between the worm and motor pulleys. Align the height of the pulleys and secure the pulleys on the axis.

    • Loose the screws on the hidden corners in a way that stepper motor can slide towards the worm gear.

    • Place the the GT2 timing belt 158mm between the worm and motor pulleys.

    • Align the height of the pulleys and secure the pulleys on the axis.

    Edit

  16. Slide the axis side to tighten the belt and secure the screws and hidden corners Push the axis spacer collar onto the bearing and tighten the screws.

    • Slide the axis side to tighten the belt and secure the screws and hidden corners

    • Push the axis spacer collar onto the bearing and tighten the screws.

    Edit

  17. In this step you will need: 1x M3 nut 1x M3-6 Head cap screw

    • In this step you will need:

    • 1x M3 nut

    • 1x M3-6 Head cap screw

    • 1x M2-6 Thread-Forming Screw

    • SatNOGS encoder board

    • 1x D6x2.5 Neodymium Diametric Magnet

    • And 3D printed parts: M3_TSlot20_nut, encoder_holder

    • Place the nut into the 3D printed part and slide it into the aluminum profile

    Edit

  18. Slide The pcb into the 3D printed part and use the M2 screw to gently hold it in place Using some cyanoacrylate glue, fix the magnet over the center of the pulley that is over the worm gear Bolt and align the encoder over the magnet using the M3 screw

    • Slide The pcb into the 3D printed part and use the M2 screw to gently hold it in place

    • Using some cyanoacrylate glue, fix the magnet over the center of the pulley that is over the worm gear

    • Bolt and align the encoder over the magnet using the M3 screw

    Edit

  19. Assemble the elevation axis like the previous one. Slide the hidden corners in the bottom side of the elevation axis as shown at the first picture.

    • Assemble the elevation axis like the previous one.

    • Slide the hidden corners in the bottom side of the elevation axis as shown at the first picture.

    • Place the azimuth axis on top of the elevation in a way that the extension of the azimuth axis intersects with the elevation axis. The motors should be on the same side. Slide to the one side as shown in the picture.

    Edit

  20. Insert the bottom side of the case and secure it using 4xM4-10 bolts 4xM4 T-slot nuts and 4xM4 washers Place the upper side of the cover. Final assembly with mast.

    • Insert the bottom side of the case and secure it using 4xM4-10 bolts 4xM4 T-slot nuts and 4xM4 washers

    • Place the upper side of the cover.

    • Final assembly with mast.

    Edit
Finish Line

2 other people completed this guide.

Author

with 1 other contributor

Pierros Papadeas

Member since: 04/23/2014

935 Reputation

7 Guides authored

15 Comments

Hello guys,

I’m building the rotator in these days. I bought a standard “EU 2020” Hidden corner connection slot 6, but the sides of the “L” are too long (26mm) and in some cases interferes with other parts. The hidden corner that I see in the pictures seems to be shorter. Where have you bought them?

Thanks

Alfredo - Reply

Anyone know where I can find the design file for the following:

.

- Axis Side with homing sensor mount

- Axis Space Collar

- Homing Ring PartM3 TSlot20 nut

- Encoder Holder

.

I can’t seem to locate them.

Matt - Reply

OK, so where do the electronic boards boards go? How do you align all this up? There seems to be a lack of configuration management on what is out there on the website. I've been trying to piece this system together for well over a month and I am still confused on how these parts go together. Where is the azimuth section (since it doesn't have the boom going through both sides)? Where are the enclosure parts for weatherproofing? Does the Arduino board go inside one of these chassis or is it separate - if separate where does it go? How do you align the motors up so you know where you are point at boot up? I have a lot more questions than answers on this project.

Herb Sims - Reply

From which plastic 3D parts have been printed?

Justinas - Reply

ABS but PETG would work fine too

Gilles BAILET -

This guide does not include details of adding the gt2 pulley to the worm drive assembly.

Ryan Turner - Reply

thanks for the suggestion. We updated some steps to add the pulley in the guide.

Pierros Papadeas -

I build one I have test the accuracy I have use a Ramps 1.4 PCB from a 3d Printer to check the first things.

https://www.youtube.com/watch?v=MmymUnJ-...

and now the next Step ........

Thanks for the Project !

stemeh - Reply

Stemeh, could you please post the link where you found the D6x2.5 Neodymium Diametric Magnet. I'm having trouble finding them online.

Thanks,

Tyler

Tyler Cerrato -

Hey,

We have not finished yet.

@houston chapman, you can check the BOM (https://github.com/satnogs/satnogs-rotat...)

Stay tuned!!

azisi - Reply

Tyler Cerrato, you can see the BOM of satnogs controller, https://github.com/satnogs/satnogs-rotat... .

Pierros Papadeas -

Azisi, could you please post the link where you found the D6x2.5 Neodymium Diametric Magnet. I'm having trouble finding them online.

Thanks,

Tyler

Tyler Cerrato -

Good to know. I thought this was it.

Thanks!

houston chapman -

I made a list of parts that doesn't include the 3d printed stuff. Could someone look over it to make sure i'm not missing something?

.

.

T connectors 3

M5-20 screws 8

M5 nuts 10

Ball bearing 6007ZZ 2

M5 slot 6 nuts 4

m5-10 bolts 4

thread lock glue

m5 washer 2

90mm M5 threaded rod

625zz ball bearing 2

m5-10 washer 2

m5 nut slot 6 4

m5-10 bolts 4

M3 nut 4

m3-12 bolt 1

m3 washer

m3-10 set screws 3

.

.

Also the guide could be more clear. The v2 guide is much better.

houston chapman - Reply

Am i missing something? there is no information about how the motors are placed or what looks like to be a belt in the final picture. Also there is no final picture in the guide. I just think this guide could be more clear.

Ramsay - Reply

Add Comment

View Statistics:

Past 24 Hours: 0

Past 7 Days: 21

Past 30 Days: 109

All Time: 14,480