Heavy Duty Pan and Tilt

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Gimbals
September 2016

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DPT01.jpg
  Mounted on my big Talon


Introduction

When I decided to put together a pan set-up for my big Talon to carry a 2 axis brushless gimbal, I went looking for components that I could buy to build a stout 360+ degree pan mechanism that didn't need gears, belts or extra linkage parts and I found the components I needed in a company called Actobotics. This project then is an extension of that earlier work on my big Talon and some of the work I put into the Mini Talon.

After buying and building several Pan and Tilt set-ups I got tired of how cheaply the purchased ones were and how flimsy most were. The biggest problem has always been the pan axis is simply never robust enough. When I did find something that was strong enough (for me) it was always too heavy and too expensive or presented too much wind area.

With the Actobotics Pieces, their Futaba servo coupler and bearing plate, I was able to build a raised bearing that made the servo connection very strong. This structure keeps all the stresses off the servo shaft and its bearings and elliminates unwanted motion or wobble.

DPT03.jpg
Base unit showing Coupler and Bearing plate


I've added to this a turret and tilt mechanism which I have modified many times.

Tilt Configurations

Because I always seem to need something different for every plane I've ended up with several versions of this idea. Most of my planes only require the ability to look down and around so there are three different camera mount plates.

  • Standard Modius/Runcam mount
  • Dual Side-by-Side Camera Mount
  • Misc Camera mount

DPT47.jpg
Three Standard Camera Mounts



Added to this I have made two different height turrets, one for the three mounts above and one for a tilt which looks both up (20 deg) and down (-42 deg). This one also has a over-under camera mount for a Mobius/Runcam and an HS1177 camera. The dual camera set-up should work well with head tracking but the pan speed may be a little slow.

DPT06.jpg
Tall and Short Turrets



DPT22.jpg
Range of Motion 0 to 70 Degrees                  Range of Motion -20(up) to 42(down) Degrees
Single and Dual Camera set-ups



Deck Mount Configurations

I designed three different ways to mount to a flat deck.

DPT14.jpg
Three mount configurations


Parts and Specifications

Parts

Bottom Unit Printed Parts

  • GWS Servo Plate
  • GWS Servo Deck Plate
  • Bearing Plate
  • Bearing Deck Plate

Top Unit Printed Parts

  • Tall Turret
  • Short Turret
  • Std Mobius Mount
  • Std Dual Camera Mount
  • Std Misc Camera Mount
  • Over-Under Camera Mount

Servos

Pan - GWS S125-1T (25 tooth)
NOTE: The GWS S125-1t servo can be found with both a 23 tooth and 25 tooth spline. The 23 tooth spline was discontinued by GWS in 2014 but there is still lots of inventory out there. The 25 tooth which is identical to Futaba, must be found for this project.
Tilt - 9g/120 Degree servo
NOTE: This project was designed using a Corona DS929MG servo. While this servo works very well it is heavy at 14.1g. Most "9g" size servos should fit with small adjustments.

Hardware

1x  Actobotics #525142 25t Futaba Servo Extension (Coupler)
1x  0.375"ID x 0.625"OD x 0.156"L Ball Bearing w/dual shield
1x  3" x 0.047" Steel Wire

Fasteners

2x  M3 x 20mm Nylon PHS
4x  M3 x 8mm SHCS
6x  M3 Flat Washer
4x  M2.5 x 8mm SHCS
4x  M2.5 Flat Washer
4x  M2 x 6mm SHCS
4x  M2 Flat Washer
4x  M3 x 15mm Aluminum Stand-offs


Weights and Measures

Total weight with all hardware and a true 9g tilt servo - 93 grams
Total weight without servos - 32 grams
Pan rotaion - 385 degrees
Tilt range, single camera - 0-70 degrees (down)
Tilt range, dual camera - -19 (up) to 45 degrees (down)



Parts Preparation

On any 3D print project, part preparation is key to a successful completion. The following images show what work needs to be done for this success.

Servo Plate/Lower Deck Mount

The servo mount needs 4 holes tapped to M3 and 4 holes tapped to M2.5:

DPT29.jpg



Bearing Plate/Upper Deck Mount

The assumption is your printer (or service) will hold the tolerance designed on an inside diameter. If your printer adds too much material you will need to make adjustments to accommodate the bearing OD which should push in with a little resistance:

DPT31.jpg



Turret Base

The Turret needs 2 holes tapped to M3 and 2 holes tapped to M2:

DPT33.jpg




Like the bearing plate, the assumption is your printer (or service) will hold the tolerance designed on an inside diameter. If your printer adds too much material you will need to make adjustments to accommodate the coupler OD (0.375") which should push in with a little resistance:

DPT34.jpg



Servo Coupler

The Servo Coupler needs 2 holes drilled and tapped to M3:

DPT35.jpg



Assembly

On the Camera Mount pivot use the two Nylon M3 screws cut down so that they tighten against each other without jamming the pivot points.

DPT25.jpg
Upper unit assembly



DPT23.jpg
Lower unit assembly



See Also

Project 3D Print Files

The following are the 3D print ZIP files used in this specific build. For more versions and information, please see my Thingiverse postings here:
Mark_q Thingiverse Designs


Some of the Vendors I used for this project

ServoCity


Comments? Questions?

email me!