Difference between revisions of "Geared Aerodynamic Pan and Tilt"

Revision as of 21:00, 27 February 2018

February 2018

Contents 1 Introduction 1.1 Configurations 1.1.1 Notes on Standard Configuration 1.2 Parts and Specifications 1.2.1 Mechanical Specifications 1.3 Parts Preparation 1.3.1 Servo Plate/Lower Deck Mount 1.3.2 Bearing Plate/Upper Deck Mount 1.3.3 Turret Base 1.3.4 Servo Coupler 1.4 Assembly 1.5 A Video Sample 2 See Also 2.1 Project 3D Print Files 2.2 Where to buy the parts 2.3 Comments? Questions?
	Aerodynamic and Accurate!

Introduction

Having designed and released a pile of different Pan and Tilt units I decided to try and make some improvements. I came up with a list of simple design goals that were based on requests and experiences with my and other PnT's. The list then, in order of importance is:

• Lighter and Faster than my HD Pan and tilt (100g)

- New weight is 80g with the selected components

• Is smooth and precise with excellent centering

- With a new programmable digital Hitec HS-5245MG servo, it is extremely smooth and centers beautifully

• Is more aerodynamic

- Now with both servos mounted below the deck, it is very aerodynamic

• Can be made from off-the-shelf components

- All but one component is made from standard off-the-shelf parts (see text)

• Rotates 360° or more

- Rotation can be programmed from 236° to 398°

• Tilts down 50 degrees or more

- Tilts down 42° (see text)

NOTE Apologies to all followers in Europe and Australia! The components selected started with a new (awesome) drive gear from ServoCity.com which I know can be very hard to find outside the US. The drive gear comes with the Hitec spline already molded in which made the design and subsequent build much easier. Of course this also means the gear shaft and bearings are also imperial dimensions.

The new unit has a lower profile than the HD unit and needs a smaller through-deck hole:

HD and Aerodynamic Pan and Tilts

Configurations

For this project I decided to keep it simple so there is only one pan-only setup and one tilt setup.

Tilt and Pan-only decks

Notes on Standard Configuration

• TBA

Parts and Specifications

Print Parts

• Base Plate
• Bearing Support Plate
• Tilt Servo Mount Bracket
• Tilt Turret
• Tilt Deck
• Tilt Deck Slide Covers
• Pan Deck

Off the Shelf Parts

• 2x Dubro #107 1/2A Control Horns (one pair)
• 1x Dubro #109 2-56 Spring Steel Kwik-Link Clevis
• 1x Dubro #172 2-56 Threaded Rod
• 1x Pushrod Linkage Stopper D2.1mm
• 1x ServoCity #RSA32-2HS-26 32 pitch/26 tooth Acetyl Servo Gear - C1 Spline
• 1x ServoCity #SPBD32-34-16 32 pitch/16 tooth Acetyl Plain Bore Gear
• 2x ServoCity #535018 .250"ID x .375"OD x .125"L Non-Flanged Ball Bearing w/Dual Shield

Hardware

• 4x M2.5x6mm Machine screws
• 4x M2.5 Flat Washers
• 8x M3 x 6mm Machine Screws
• 3x M3 x 10mm Aluminum Stand-off
• 1x M3 x 30mm Machine Screw
• 1x M3 Nylok Nut
• 2x M2 x 8mm Machine Screw
• 2X M2 Hex Nut
• 2x M2 x 4mm Machine Screw
• 6x M2 x 5mm Flat Head Machine Screw
• 1x M2 Flat Washer

Servos

• Pan - Hitec HS-5245MG digital programmable Mini Servo (27g)
• Tilt - Corona DS929MG digital micro servo

NOTE: This project was designed specifically around the two servos shown

Mechanical Specifications

Total weight with all hardware shown - 89 grams

Pan rotaion - 236 - 398 degrees

Tilt range - 0-42 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:

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:

Turret Base

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

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:

Servo Coupler

The Servo Coupler needs 2 holes drilled and tapped to M3. Optionally you can cut a 2mm x 6mm slot to pass wires from the camera plate down below the bearing plate.:

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.

Upper unit assembly

Lower unit assembly

A Video Sample

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

• Project Layout Drawings
• Project STL Files
• New Servo Coupler STL file
• Thingiverse - Heavy Duty Pan & Tilt

Where to buy the parts

• For the bearing and servo coupler -

In the US - ServoCity

In Europe - StepLab

• For the GWS S125-1t 25t servo -

Global - GWS S125-1t Servo

Comments? Questions?

• email me!