Hi,

I thought I might once again tap into the wealth of knowledge on this forum.

This is a long one, so I apologize in advance!

I have been doing camera moves manually with a 410jr mounted on a linear motion guide (non-driven slider) and am having some issues;

I come from a live action background, so I have a huge liking for highly complex as well as very subtle camera moves to emphasise story points. I am finding it very  difficult to achieve satisfying results using my current set up and think that I will have to inevitably move to motion control.

Now, before anyone suggests that I go out and spend $25,000 on an ARC MoCo (I wish!!!!), I really can't spend much more than $2000 USD.

I do have a simple engineering workshop available for use, but my skill-set in mechanical engineering is very limited. My skill-set in electrical engineering is virtually non-existent.

So this leaves me with few options. I think buying something, which I know for certain will work and do what I want would be the ideal option.

I've been researching and it seems that the eMotimo TB-3 would be the most sensible choice of head, although it only offers 3 axis - so that would be an issue if I ever needed to add a focus option.

http://ditogear.com have some really nice heads, but again, 4 times the price of the TB-3

As far as dollies go, the only affordable option seems to be the Dynamic Perception Stage Zero 6ft kit as a sort of "plug and play" with the TB-3.

Other options include: http://ditogear.com/products/omnislider-animators-edition/

Which would be great, as it would leave me an additional 7 channels of moco for upgrade purposes. However, I am not sure if it is possible to simultaneously run two different USB moco drivers through Dragonframe?

And then there are the Kessler cinesliders, which with an added servo would perform a similar task.

And lastly, linear actuators off of ebay with low-backlash ballscrews. The only problem with this is that I would have no way of knowing the quality of the product before arrival due to lack of reviews etc.

All points to consider.

I'm looking at purchasing within the next 2-3 months.

Does anybody have any further thoughts/experiences?

Thanks!

Harrie 

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Hi Doug,

I was admiring your rig earlier. Something like that would be great. It is likely beyond my ability level however to build one like yours. Particularly the electrical portion.

Sourcing parts in new Zealand at a reasonable price can be problematic also.

However, I'd love to set something like that up. Maybe the ditogear control box that integrates direct with dragon frame would be a good base?

Or perhaps I could copy your wiring? Does yours integrate well with dragonframe? Does it take a lot of trial and error to get it all operating smoothly, or is it fairly straight forward?

The actual physical construction  provided I can source parts for a reasonable price, looks fairly straight forward on second glance. I figure if I used bearings on all joints and full aluminium construction etc that I could get pretty reasonable repeatability etc. 

What is your 7th axis? I count 1:pan, 2:tilt, 3,focus, 4:track, 5: boom, 6: swing. What does the 7th axis do?

But yeah, I don't really know the first thing about wiring up steppers, gearing etc etc, so may be a little ambitious. 

Thanks,

Harrie

Ahh, no:7 is roll.

Ok, commenting on my own thread, again, but...

I just got off of the phone with a friend who has been researching (conveniently) a lot into diy cnc machining lately. It would seem that the electrical portion of the rig is not overly difficult, and using dragons integration with the Arduino boards it is pretty feasible to make this myself.

My dad is an engineer, so I guess I better start offering up a bunch of yard work or something! Anyway, for the mean time it's to the drawing board and deciding on things like belt vs. chain vs. delrin gear  driven components etc.

Are there any particular things to look out for in these homebrew systems?

Thanks for your patience,

Harrie

Would love a wiring diagram, thanks! Some info on the power supply would be great too. The electronics are my weak point - so if I can just copy yours exactly I should be sussed. I have a friend who is a programmer, so he should be able to modify the Dragonframe Arduino sketch for me as far as calibration etc goes.

My email address is hendrikusdevaan@gmail.com     - Please, no hurry on this. It's going to be a long, slow build anyway. I really appreciate you taking the time to offer the advice however. If I had more money I would probably just try and commission you to build me the electronics ;)

I've decided to go for full metal construction for the mechanical and structural components, aluminium and steel, as I have 24/7 access to a basic engineering workshop and limited part time access to an engineer too (my dad). I've been doing some sketches etc, I'll post build photos once I make a start on it.

I think I'm going to forgo the roll axis initially and consider adding it later as a "bolt-on" dutch tilt head. I think this will save a lot of build time initially as I have potentially sourced an affordable stepper driven pan/tilt head assembly that I can modify to fit on the end of the jib.

Cheers,

Harrie

It sounds like I'm on much the same page as you. I've been researching MoCo for both live-action as well as stopMo, and attempting to put together a ~2k$ rig.

Here was my last brainstorming session and notes, looking at and comparing what is commercially available;

http://bradisdrab.wordpress.com/2013/02/10/cambot-brain-storming/

Its definitely do-able. You should also look into Dynamic perceptions, they have an open source platform which they are developing hardware for too.

I started a thread there as well;

http://dynamicperception.com/forums/general-discussion/products/dmc...

Thanks Brad,

some good research there. Those worm bearing look pretty sweet!

I've decided to do a two phase build. 

Phase 1: 4 axis rig - Dolly, Pan, Tilt and focus. With 8 channel control box.
Phase 2: Additional 2 axis - Boom and Swing + housing table etc.
For the dolly I will use 1500mm SBR20 linear motion guides from ebay and a ballscrew assembly driven by a phidgets 26:1 motor.
The pan and tilt head I have bought special order from emotimo without the electronic "guts" so I can drive it using my own controler.
Controller will be an Arduino Mega R3, (motor drivers not finalized but likely these x8), powered by a cheap chinese 12/24v 20a power supply. Probably using xlr cables for the plugins.
Cheers,
Harrie 

This is also a great design for a DIY pan/tilt head that would fit inside our budgets;

http://dynamicperception.com/forums/diy/motion-control-hardware/15m...

That looks pretty nice. I've actually already ordered my pan and tilt head.

Is this how you are building yours?

Basically thats what I've got in mind for the pan/tilt right now, and looking into a new dolly/slider and Jib, or simply upgrading the one I've got. Hoping to set it up for both live action and StopMo, on a stage and out on location. So it needs to be somewhat modular and self-contained in the end, so not (solely)controlled by a computer.

I liked your phase explanation, so here is mine;

Untitled

1. Manual stopmotion rig; Geared tripod head, mounted to Jib(rigged with automotive jack), on Machinist's rotary table and linear slide. Current arrangement is set up for manual moments. Turning the wheels incrementally of the geared head and cross slide allow for an animate-able camera.

2. Live action remote rig; DC motors, Dynamic Perceptions AT-2 controller, and potentially; This servo recorder, (with speed controllers) The second step will be setting up the hardware for motorizing it, I'm looking into offset gear motors, DC motors, and gearboxes. I'm planning to work out/test 2 axis at a time in realtime, and possibly set it to record/playback up to 4 axis with the servo recorders.

3. MoCoBus Rig; stepper motors, nanoMoCoupgrade device Once the mechanical parts are working for live action, I'll be looking into swapping the DC motors for steppers driven by nanoMoCo. The whole system chain (MoCoBus) will feed into a computer, (potentially a netbook) for movement recording/edit/playback, StopMo, etc. (Software Workflow)The upgrade device will also allow me to drive the steppers and record the Joystick's movements into the MoCoBus chain.

I'm not much of an engineer, more of a hardware-hacker and I'm basically teaching myself this as I go along, which is partly why I'm working it out in parts. I've also not got access to a proper machine shop, so I'll either be at the mercy of my friends, looking into buying a mini mill, or attempting it with hand tools >./p>

I figure its going to be slow going, but should certainly be possible.

 

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