Heavy Duty Pan and Tilt

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Gimbals
September 2016

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DPT01.jpg
  Mounted on my big Talon


Introduction

After buying and building several Pan and Tilt set-ups I got tired of how cheaply the purchased ones were and how flimsy they all were. The biggest problem has alwys been the pan axis is simply never robust enough.

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 pan mechanism and I found the components in a company called Actobotics.

With their servo coupler and bearing plate I was able to build on a 3D printed servo mount, a raised bearing that made the servo connection very strong. This structure kept all the pressure off the servo shaft and its bearings.

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 Camera Mounted
  • Misc Camera mount

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 (19 deg) and down (-42 deg). This one also has a over-under camera mount for a Mobius/Runcam and an HS1177 camera. This one should work well in a head tracking set-up.

DPT05.jpg DPT07.jpg
Short and Tall 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 it to a deck. The first deck plate which incorporates the bearing mount puts most of the unit below the deck.

DPT11.jpg
With top deck-mount plate



The second deck plate replaces the servo mount and puts the tilt mechanism up higher. This would be used when you don't have a lot of depth under the deck.

DPT13.jpg
With lower deck-mount plate



The last method is to simply drill the airframes deck to fit around the standard servo bracket.

DPT09.jpg
With no deck-mount plate



Parts and Specifications

Parts

Bottom Unit Printed Parts

Std Servo Bracket
Servo Bracket/Deck Plate
Bearing Plate
Bearing Plate/Deck Plate

Top Unit Printed Parts

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

Servos

Pan - GWS S125-1T (25 tooth)
Tilt - 9g/120 Degree servo

Hardware

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
1x Actobotics Servo Coupler - 25 tooth
1x 0.375"ID x 0.625"OD x 0.156"L Ball Bearing
3" 0.047" Steel Wire



Weights and Measures

Total weight with all hardware and a true 9g tilt servo - 93grams
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



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!