Its development and use

HURLEY DOLLY

This blog describes the construction and use of the "Hurley Dolly". A camera dolly is a mechanised system to allow a camera to move. This is easy enough to arrange in a studio, but we wanted to use it in remote and difficult places. The dolly and track is constructed of rugged and easily-mended materials. It is designed to be simple to use when the weather is bad, the operator is tired, hungry and cold. It works. Frank Hurley was a pioneering photographer of the early 1900's. He was the photographer on Douglas Mawson's Expedition to Commonwealth Bay in Antarctica. The Dolly was first designed for use in Antarctica on an expedition to Mawsons Huts, so we named it after Frank Hurley. The Hurley Dolly. To read this in chronological order, start at the end and work upwards.

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The Final Result

This is what the trip was all about. A fulldome 20 minute movie on a 4m dome at the Aboriginal Cultural Heritage Centre in Carnarvon Western Australia.

An amazing presentation, developed by Dr Peter Morse partly on the iVEC supercomputer at University of Western Australia, shows the Jangurna story of the people in the stars, plus timelapse photography of some significant sites in the area.

Photographs courtesy of Paul Bourke, Research Associate Professor and Director: iVEC University of Western Australia

http://paulbourke.net/  and  see also http://www.petermorse.com

and see also the story of the trip at http://www.chrishenderson.net

The Hurley Dolly on location

Pete has been engaged to do a fulldome movie of the night sky for the Aboriginal Cultural Heritage Centre in Carnarvon.  This entailed taking two EOS 5DmkII cameras plus fisheye lenses, and computers plus two dollys – the dynamic perception MX2 dolly and the Hurley Dolly in a 4WD and driving from Hobart to Exmouth.  5,000km across Australia and half way up it.

The story is told on at http://www.chrishenderson.net which you’ll find pretty interesting.  Hard work, very hot but rewarding.

The Hurley Dolly proved to be quick and foolproof.  Also very rugged.  It just did what it was supposed to every time.  The batteries were in the box and seemed to last forever.  The switches and knobs are excellent – when it’s hot,and you’re tired (and we were!) then you don’t have to think because everything does what it says.

I’m making a few modifications now – a buzzer to tell you it’s stopped its run, a wider vernier scale for mm moved, and an ability to take over the timing using an external hand-held camera timer.  I’m also remaking the frame, using a professional bending service to make a better-looking system.

Here’s a few pictures of the Hurley Dolly on our trip. Click on a picture to enlarge it and get a slideshow.

Fully portable timelapse dolly

 

This one now has a portable frame.

The frame is made from a lightweight ladder, cut into 3 pieces which can be carried easily through the bush and reassembled.  The supports are 3 tripods – which are themselves lightweight and portable, and at least one will be part of the kit anyway.

If the platform sways in a strong wind, which we found was a problem with previous trials, it can be guyed using tent pegs into the ground or attached to firm objects.

 

 

HDR timelapse

Taken with Pete’s Canon EOS 5 Mk II, processed using Photomatix.

New time and motion movies

Here are some shorts done with this setup (none have any glitches, but they might show the occasional jerk with internet download or a slower graphics card).

The latest Hurley Dolly is great – it’s easy, rugged, and reliable, and folds away into a backpack for getting where we want to go.

LILLIES

GARDEN – RISING SHOT

PINE SHRUB

MACRO FLOWER

MACRO FLOWER DEFLICKERED

Compare this with the previous video.  Using GBDeflicker, the video has been made smoother.  Good program.

FINALLY … HURLEY DOLLY 9.1

So after all this effort I finally built the present one which seems to just work: Hurley Dolly 9.1.

By this time I have done a lot of design and building, tested and scrapped a lot of ideas, and done a lot of web research.  I knew about the guys at Dynamic Perception, with their OpenMoco based dolly system (www.dynamicperception.com) and (www.openmoco.org).

Pete bought a Dynamic Perception setup, and I bought their Arduino shield to build one myself.  It works really well, and is very clever.  The quality of their board and the detail in their engineering is superb. If you want really good stuff, go to them.  Best I’ve seen without costing very large dollars.

However, a couple of things didn’t quite suit us with the Dynamic Perception gear. The track is only 6ft, and is made of specialised aluminium section which you can’t get in Australia (or if you can it’s probably very expensive). This track isn’t long enough for distant shots, though they are selling a 6ft extension now.   However, I’m looking for something which is adaptable so we can use onsite meaterial if necessary (like a ladder).  And, oddly enough, it’s too clever.  The problem is the wide range of settings in their menu-driven interface, and the large number of things it will do. As I said before, people get tired, hungry and cold and make mistakes.  The simpler and more rugged this gear is the better – what I’m after is knobs and switches.

But if we are doing dolly-timelapse in controlled environments, Dynamic Perception’s gear is the way to go – and I reckon we will use it too.  But we want to sling this stuff in a backpack and take off into the bush with the camera – and still get superb footage.  So I continued the original design route concentrating on a simpler approach.

What I really liked about the Dynamic Perception setup was their drive mechanism.  It’s a heavily geared 12v DC motor with a toothed pulley and guide wheels.  They have also started selling 12ft belts.  So when I was recently in USA I bought the motor and belt and made some electronics to drive the motor and trigger the camera.  Put an internal battery in the box, rigged a tensioning system for the belt, strapped on the old skateboard wheels, and here we go.  A big plus is that this will also work with nylon cord – wrap some around the pulley wheel and tension it right, and it works just as well (not so good uphill though).

Success!

Things that didn’t work

It took a year to develop the latest camera dolly.  A year of making mistakes, having ideas, building stuff and moving on.

I don’t mind this process – I spent 7 years doing scientific research and the only way to progress is to be wrong.  But you have to be wrong in the right way – you have to understand why you’re wrong and what you need to do next time.  If you don’t understand that, then you’re doing things more or less at random.  So everything I did wrong, I made sure I understood why before designing something else.  The internet helped a lot – there you can look at other peoples ideas, and, most valuably, look at what they did that failed so you don’t have to do it.  Saves heaps of time.

The way to be more successful is to make more mistakes.

Here’s some ideas that were simply daft in the first place, or failed for some other unforseen reason.

GRANDMA’S ELECTRIC CART

Grandma’s electric cart worked surprisingly well – but was far too fast for the dolly shots.  Nevertheless, for straight movies it looks like a good one.  However you do need a granny who is helpful, plus cart – I realise that all 3 are not necessarily available to everyone.

GOLF BUGGY REMODELLED

The golf cart not only looks silly, it doesn’t work either – too fast and too bumpy.  I then geared it down by 1/5 and put another motor on it, but it was still bumpy.  However worth bearing in mind that these golf carts have huge pulling power – they will take a pretty weighty load of golf clubs up hill, and are very well engineered.  Lots of them around – these were scrap for $5 each.

GARAGE-DOOR-OPENER DRIVE

This one worked pretty well, and was robust, if a little big, but was too fast.  It’s made from a garage door opener motor and gearbox, printer paper roller, and the ubiquitous skateboard wheels (which have several grades, depending on the number of bearings in them: betcha didn’t know that).  It gave a really stable image, and I might revisit it one day.  Incidentally the idea of having lots of wheels on castors is to avoid jerks in the camera if there is any bump in the track.  It pretty well removes the effect of little ones (ie 1mm or so).

STEPPER MOTOR DRIVE

This was a clever one, pity it didn’t work, but the idea is right.  It’s a stepper motor and driver with a belt drive to 16 wheels on the tracks.  Worked well, was robust if a bit heavy, and was adaptable to any size of track (very important for what we’re doing – we want to be able to use anything that comes along if need be).

There were two problems – it wouldn’t go uphill, only on the level – the wheels slipped on the tracks.  And the belt, which was a rubber ‘O’ ring, stretched and slipped.  I could have got a better drive belt, but it was obvious it wasn’t going to work anyway so I scrapped it.  Lot of work though.

TRACK IDEAS

I also experimented with long track.  Ordinary black poly pipe just doesn’t work – too soft, too bendy and too hard to control.

Then I tried this green stuff. What I found out was you need support all the way, which means it has to go on the ground, or be made of something solid (like the steel section we used in Antarctica).  This is thick walled high pressure water pipe, pretty stiff but it still sagged between the sleepers.  It would work, but at the cost of a lot of infrastructure.  The ladder and beam arrangement of the West Coast trip illustrates this – we needed a 4WD to cart it around.

So what we’re going to end up with in the track department is probably a ultra-lightweight custom-made foldable track.  Either from thin steel and electrical conduit, or from a cheap light ladder.  The advantage of this is it will fold up and go on the back of a pack.  In theory.

The other advantage is that if for some reason we can’t take it with us (on a plane for instance) we can use a ladder from the location, or corrugated iron, pine studs etc.

Moving on

The Hurley Dolly had proved itself in many situations.  However, it was time to re-visit the mechanism, which, though rugged, was too heavy for easy transport off-track.

The aim was to produce a lightweight driver, which ideally would operate from a small battery, be simple to use, and fit in a backpack.

The demanding requirements of Fulldome Panorama 20 megapixel photography meant there was no room for a sloppy mechanism – it had to be very smooth indeed.  And reliable.

Operating under difficult conditions meant the controls had to be very simple.  I have built a lot of gadgets for remote areas, and one thing which you can rely on is – you can’t rely on the gear.  If it’s complicated, someone will stuff it up.  If it’s cumbersome, it will get dropped.  If it’s sophisticated, it will break.  People get tired, cold and hungry.  They make mistakes.  Just getting to some of these places is a huge effort, and, when it’s raining and people are tired, they want to concentrate on doing what they came for, not fiddling with equipment.

The gear has to be simple – preferably using bits and pieces easily to hand.  If you can’t fix it on the spot – your effort it wasted. And, though I take enough bits to mend anything common, there’s always something that’s missing.

Generally I have 3 ways of doing everything – so I have 3 options for power, 3 computers, 3 leads etc etc.  Chances are you won’t use them all.  If you do, you’re grateful, if you don’t, well, you’re lucky.  There’s no point in taking the kitchen sink, but you need backups.  I learned this lesson once and for all when I was flying in remote areas – my pilot was a fussy bugger who always filled the planes tanks everywhere he could, taking another half hour or so over it.  For a couple of years we flew around the Kimberly and landed back home with heaps of fuel.  I took the piss out of him for this.  Until one day we flew down to a tiny airstrip a long way away, and found the bloke on the runway up to his knees in water.  We turned round and flew home – with enough fuel in the tanks to land.  I shut up after that.

Julia Tarn

Julia Tarn is a small pool near the road which provided an opportunity for a more intimate view.

Cradle Mountain bad weather

You can see the weather getting worse. We packed up and left – 20 minutes later we were in cold windy cloud.

Cradle Mountain from the slopes

 

 

We moved up the slope to get a view of the lake and mountain.  Carrying the track was possible in the thin scrub, we used pieces of dead wood and rocks to make the stand.

 

Cradle Mountain – Dove Lake

A trip to Cradle Mountain, one of Tasmania’s iconic tourist areas, provided another opportunity for documentary footage.  Dove Lake is in a glacial valley nestling at the foot of Cradle Mountain.  The day was still and sunny with cloud shadows chasing across the cirque. Perfect.

Time for a change of track

The West Coast trip was good, but needed a 4WD for the equipment.  Next we needed a way of taking the gear into the bush.  For this, a new track was built from light steel channel and electrical conduit.  This weighed very little – its only problem was its length.  Getting it through scrub was difficult, but where there were few trees it was ideal.

West Coast Tasmania fulldome panorama timelapse movie

A compilation of the movies taken from wilderness in Tasmania’s West Coast.

This is essentially raw 3.7k unprocessed footage used for preview purposes only. We have lots of ideas for Tasmanian content that we are developing.

Mountain view

 

These are the mountains inland on the back road between Queenstown and Zeehan.   A spectacular valley, full of history.  A  friend of mine was born here at Lake Margaret, town for the oldest power station in Tasmania.  It’s now a ghost town.

Hell’s Gates Kite Photography

A radio controlled camera flown from a flowform kite takes pictures at 1 second intervals.

Hell’s Gates Hurley Dolly

Hell’s Gates is the name given to the entrance to  Macquarie Harbour.  So called because in the convict days the worst prison of all was on Sarah Island in the middle of the harbour.  It’s a narrow channel with fierce currents and a wide beach.

Rainforest dolly timelapse

 

 

We carted the Hurley Dolly into the rainforest down an old railway track at Bird River.  Took some beautiful shots of the bush.

 

Bridge timelapse dolly shot

A bridge provided a convenient platform for the dolly.

West Coast Creek

A delightful small creek allowed us to make a timelapse movie.

West Coast mountain valley

 

Sometimes the weather doesn’t cooperate, we just had to wait until the rain stopped with a tarp over the camera and platform.  It was worth it.

TASMANIA’S WEST COAST WILDERNESS

 

About 6 months after returning from Antarctica we modified the Hurley Dolly for a trip to the wilderness area in Tasmania’s Southwest as part of a documentary project.

The track was replaced with a longer one – giving a travel up to 8 metres, and made rigid in two parts.  We used 2×4 pine studs attached to an extending aluminium ladder, topped with thick walled high pressure pipe.  This gave us only one join in the whole length of the track.  The platform was replaced with a plywood triangle.

The drive mechanism, which had proved so reliable in the field in Antarctica, was retained but the drive rope was replaced with Specta line – non-stretch nylon.  This gave us a solid extensible dolly.

All this came at the expense of increased weight, but in this case it didn’t matter since we were taking a 4WD into the bush.

 

ANTARCTIC TIMELAPSE MOVIES

A compilation of timelapse movies from Cape Denison.  Published on the New Scientist web page:

http://www.newscientist.com/blogs/nstv/2011/09/time-lapse-tuesday.html

 

Ice cliffs fulldome panorama timelapse

The circular fulldome lens compresses 360 degrees into a circle.  Imagine the whole of this surrounding you.  The part at the bottom (6 o’clock) will be in front of you, at 12 o’clock it is behind you.  The centre is above your head.

Antarctica – Ice cliffs

The Hurley Dolly had proved itself now we needed a movie looking at an ice cliff.  This involved building a level stable platform on the rocks above the cliff, using the Meade mount to give 3-axis movement.

The design of the equipment meant it was easy to build the track, and the rails provided solid and smooth panning.

Antarctica – outside Mawson’s Huts

This involved getting up very early to catch the sun at the right angle.

And keeping everyone else out of the valley in order to keep the view clean.

PETE PUT YOUR IMAGE OF THE SETUP AND VIDEO HERE

Antarctica – Mawson’s Huts


This posed particular problems.

Nobody had done this sort of immersive cinematography in Mawsons Huts before.  In order to get a good movie of the huts all the extraneous junk had to be cleared out.  This didn’t necessarily please the conservators who were working in the huts, but it had to be done – Pete was shooting fulldome and it would see everything.  For the first time in many years the hut was back to the state in which Mawson left it.

The camera had to go through a doorway – which was thinner than a normal door.  You can see the track system where a second groove had been cut in the ‘sleepers’ so we could put the steel rails closer together.

Pete used a Meade mount on the tripod to get a shot rotating in two other dimensions as well as travelling through the doorway.

A remarkable achievement and a stunning piece of film…..

Building a camera dolly

Pete (www.petermorse.com.au) wanted moving timelapse videos from Mawsons Huts at Cape Denison in Antarctica.  The problem is this site is not on any Antarctic Base (in fact, Pete had helped build part of what base there is in 2007-8), and the provision for technology is limited.  Essentially we live in two freezer containers with few resources.  We are dropped off by the French on the way to their base, and remain at Cape Denison for 8 weeks.  Mawsons Huts is one of the historic places in Antarctica where Sir Douglas Mawson overwintered for two years 1911-13.

The location could be anywhere on the Cape, from inside the hut to the top of an ice cliff.  The gear had to be separated into parts able to be stowed in a cage pallet, lifted from a helicopter.  It had to be light enough to carry, easy to assemble.

Pete was using 20 mpix images and a Canon EOS 5 mk 2. The images were to be projected on a fulldome panorama screen.  This meant that any shake in the camera mount was unacceptable, even 1mm was too much because it would translate into a large movement onscreen.

The camera had to move very slowly – a few inches per minute at the most.  It had to move at exactly the same speed all through the travel, the track had to be level and support a tripod.  It was to be powered from a 12v battery and have enough torque to move the whole mount easily.

Many ideas were tried, eventually culminating in the drill dolly, where 3 electric drills were used in a cascade.  The design of every part was important, and it all took a lot of time.

The wheels were from high quality rollerblades, the track was a V-track, with welded links specially designed to be smooth.  The frame was aluminium, bolted together.  The drive wheel was an old RC car hub, but with chamois leather for grip.  The drive string was 3mm nylon cord, stretched just right.

Eventually the whole thing worked – and worked well.  It was very rugged, powerful, transportable.  It’s still going strong, but the design has moved on.

Drive system

Right at the start

The start of the Hurley Dolly

Frank Hurley stands next to the door of Mawsons Huts, 1911.  The debris he is standing on is still at Cape Denison, and the hut has been preserved by the Mawsons Huts Foundation over the past 11 years.  The Foundation has covered the roof, and cleared ice and snow from inside the hut.