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 My dolly projet 
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Joined: Mon Nov 30, 2009 6:50 am
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Post My dolly projet
Finally have decided to start my own dolly too :)
I'll use servicity motors and electronics.
Will be a close loop.

The goal is to use only rectangular on the shelf material.
I'll be helped for the welding.

I want to do a camtramsystem like but lighter.
It should work on a lader but i'll make my own rails system too. Hopefully could fit in my car 5 or 6 meters long rails :roll:

My english is really not enough for technical explanation :(
Hope the images will be self explainable ;)

Image

Image

Image

Image

Image

An update to almost definitive size to fit my ladder. I'll use Rollerblade wheels.
The last problem is to find the good profiles that can match one inside the other one :(


Image
Image
Image

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Tue Dec 15, 2009 4:51 am
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Post Re: My dolly projet
This looks good!

Have you found the Servo City parts yet?


Tue Dec 15, 2009 7:29 am
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Post Re: My dolly projet
timescapes wrote:
This looks good!

Have you found the Servo City parts yet?


Nope :(
Still trying to "hack" your pictures ;)
Would be cool if you could help me on this part ;)

Btw i've asked servocity how slow their Pan&Tilt arm could be tuned by changing their motor.
An easy modification would be changing their 20rmp motor bt a 1rmp one.
That would make an 0,025°/sec pan or tilt which seens to be too much.
The guy said he would ask the head tech if it would be hard to change the wheels and belt ;)
A 0,005 would be good no ?

This sytem using only servocity parts would be great so i could control pan, tilt and dolly with simple knobs ;) Or joystick when i'll use theses for real video purpose.
Not computer controled but already great as i just need linear speed for all these !
Accelerating is not that much needed for video editing !

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Tue Dec 15, 2009 7:42 am
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Post Re: My dolly projet
I've add some update images.

Anyone on this pan&tilt speed ?
0,004°/sec would mean 90° in 6 hours !

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Wed Dec 16, 2009 8:23 am
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Post Re: My dolly projet
Have simplified the structure.
Found some one to make this Z profile.

I also think it would be great to unify 2 wheels to absorb rails junction errors !

What thinking using rollerblades wheels !
Any one has better ideas ?
Softer one could absorb error too ?

Image

Image

Image

Image

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Thu Dec 17, 2009 5:39 am
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Post Re: My dolly projet
I wouldn't suggest using nuts/bolts in slots like that to hold the side wheels. You're going to find them constantly slipping and needing adjustment. Not to mention, it's going to be very difficult to align the two wheels perfect to each other. A better choice would be to keep the slots like you have, but have the 'nuts' slightly loose. Then, have a 'backing plate' with a post going through (towards the broad side of the rail), to press against the mounting bolt for the wheel, and a heavy-duty spring to apply pressure. This way will keep both wheels at a consistent pressure against the rail, without requiring constant adjustment. It's harder to implement, but will be much easier to maintain.

If you're going to keep that model, then make sure you at least use nylock nuts on top and bottom, along with neoprene washers to prevent slipping.

Additionally, what's the purpose of the 2nd bend in your 'z-plate' that covers the wheels? Seems like additional cost when you could've just used L-style plate and left the wheels uncovered, with little benefit (contaminant protection is pointless as the two exposed sides completely undo any effort there).

!c


Thu Dec 17, 2009 8:23 am
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Post Re: My dolly projet
shutterdrone wrote:
I wouldn't suggest using nuts/bolts in slots like that to hold the side wheels. You're going to find them constantly slipping and needing adjustment. Not to mention, it's going to be very difficult to align the two wheels perfect to each other. A better choice would be to keep the slots like you have, but have the 'nuts' slightly loose. Then, have a 'backing plate' with a post going through (towards the broad side of the rail), to press against the mounting bolt for the wheel, and a heavy-duty spring to apply pressure. This way will keep both wheels at a consistent pressure against the rail, without requiring constant adjustment. It's harder to implement, but will be much easier to maintain.

If you're going to keep that model, then make sure you at least use nylock nuts on top and bottom, along with neoprene washers to prevent slipping.

Additionally, what's the purpose of the 2nd bend in your 'z-plate' that covers the wheels? Seems like additional cost when you could've just used L-style plate and left the wheels uncovered, with little benefit (contaminant protection is pointless as the two exposed sides completely undo any effort there).

!c


yes that is right :(
I'm concern for that alignement.
I'll try that spring idea :)

For the second L part it allows to fix the Top plate !
maybe this new image will help you ;)
Some one is doing it on Catia for me :)
Image

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Thu Dec 17, 2009 8:38 am
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Post Re: My dolly projet
bziegler wrote:
Anyone on this pan&tilt speed ?
0,004°/sec would mean 90° in 6 hours !


Personally I like pans in the range of 0.01-0.05 degrees between shots. For a continuous motion system like you're planning the required motor speed would depend on the interval between shots. Aesthetically, time-lapse pan that takes about 7sec per field of view looks good, requiring you to include the lens focal length in the calculation. If you're doing astro shots then I guess 0.004deg/sec (is that max or min speed?) may be slow enough for long exposures with a wide lens - I'm not the expert. A very slow pan is more acceptable than a overly fast pan, so maybe err on the side of slowness. Quite ambitious, controlling 3 axes without some sort of sophisticated user-interface. You'll probably end up having to do a lot of experimentation and note-taking. If you see yourself doing this for years to come I would imagine the time spent learning about building your own controller, or at least exploring the possibilities (e.g. using the Arduino microcontroller or tethered laptop control) is time well spent. Just my 2 centimes.

About 1/3 of my dolly time-lapses are (nearly) vertical moves. If I designed a new dolly it would be able to run upside down and vertically.

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Thu Dec 17, 2009 2:22 pm
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Post Re: My dolly projet
I'll mostly use wide angle lens.

As everybody i whished to have the best system allowing any time of shoots :)
I really like the CamBlock system as i could use it for 3D effects too.

But as i'm starting i just to be sure all this can make me win some money.
I've + or - sold a projet for an corporate video of Airbus.
Still trying to see what budget i'll get for it.

And yes i'll love to have a crane !!!!

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Fri Dec 18, 2009 1:43 am
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Post Re: My dolly projet
So finnaly here is a beta version !
12) Need to re-enforce the wheels kart.
2) Need to make it adjustable in width.

but already works at least :)
Still waiting Servocity parts !! ordered End December. Hope they didn't forget me ;)

And guys where did you found this part and fixed it to Servocity stuff ?
Image


Image

Image

Image

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Sun Jan 17, 2010 8:29 am
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Post Re: My dolly projet
looking like a nice rig! I have no idea where you'd find that part in France but in the states it's a 'two inch pulley'. In architectural applications I've used that same part for counterweight transfer on huge doors.

I can't image you have 'tractor supply co' in France! : http://www.tractorsupply.com/home-impro ... er-1185293


Sun Jan 17, 2010 8:45 am
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Post Re: My dolly projet
Maybe in a model strore ?
I'll find something for sure but it has to be easy to mount on servocity part :)

I'm so exited :)

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Sun Jan 17, 2010 8:49 am
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Post Re: My dolly projet
Great work! Looks awesome - can't wait to see it in action!

!c


Sun Jan 17, 2010 3:50 pm
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Post Re: My dolly projet
Nice work! Love the erector set approach, very practical. What are your plans to capture the cable or belt ends on the ladder track?


Sun Jan 17, 2010 10:08 pm
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Post Re: My dolly projet
FINISHHHHHHH :)

pfff 30 days to get Servocity stuff :(
Hope i wont brake anything.

I'll show pictures and video test soon :)

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Fri Jan 29, 2010 7:10 am
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Post Re: My dolly projet
bziegler wrote:
I'll show pictures and video test soon :)

I can't wait to see it. ;)

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Fri Jan 29, 2010 9:16 am
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Post Re: My dolly projet
FINISHED :)


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Wed Feb 03, 2010 6:24 am
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Post Re: My dolly projet
Beautiful! Congratulations and well done! :)

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Wed Feb 03, 2010 7:36 am
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Post Re: My dolly projet
Good job

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Wed Feb 03, 2010 10:09 am
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Post Re: My dolly projet
Looking good.


Wed Feb 03, 2010 4:52 pm
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Post Re: My dolly projet
Looking great! Now just put a 1rpm motor in it for timelapse.

Also, I am thinking I need to add a voltage meter between the speed controller and the motor, to know how "fast" the car is traveling, in order to coordinate the pan and tilt.


Wed Feb 03, 2010 5:38 pm
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Post Re: My dolly projet
very nice

did you machine all of those holes in the trolley platform yourself?

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Thu Feb 04, 2010 11:54 pm
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Post Re: My dolly projet
jake.carvey wrote:
very nice

did you machine all of those holes in the trolley platform yourself?

Nope is was like that !


timescapes wrote:
Looking great! Now just put a 1rpm motor in it for timelapse.

Also, I am thinking I need to add a voltage meter between the speed controller and the motor, to know how "fast" the car is traveling, in order to coordinate the pan and tilt.


Excellent idea !
I did measure it and made a table for it. I can reach it trough Google document thanks to my Iphone :)
I use the same tables for the Pan/tilt !

Gives me for my ladder (1.8 meters of travel ) :
12.8V = 1h30
10.2V = 1h40
8V = 2h
6.1V = 2h50
4.2V = 4h10
2.5V = 7h40

under 2V it gets erratic !!
But good stuff to play with ;)

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Sat Feb 06, 2010 8:07 am
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Post Re: My dolly projet
Nice!!!!!
I love your dolly. But love your introduction video more. ;)
Congratulations.

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Sat Feb 06, 2010 8:19 am
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Post Re: My dolly projet
bziegler wrote:
jake.carvey wrote:
very nice

did you machine all of those holes in the trolley platform yourself?

Nope is was like that !


is that a cheese plate from a film supply shop? or did you get it though a metal supplier?

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Mon Feb 08, 2010 2:50 am
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Post Re: My dolly projet
From a local général home dépôt store !
Not really spécialises !

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Mon Feb 08, 2010 3:05 am
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Post Re: My dolly projet
dustin wrote:
Very nice. A lot of those parts sure look familiar :-) . Great work!!


yep thanks for helping :)

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Sat Feb 13, 2010 3:33 am
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Post Re: My dolly projet
I've bought some spare parts from servocity.
I got a 120tooths and a 2nd 200 one.
And 6, 20, 51, 101 Rpm motors (had the 1 and 303). this allows full speed control from 210min to 9 sec for a meter.

I also started to think at a complete home made rails.
So i can have 10meters to 1.5meters long dolly.


Image
Image


Next step will be to use a belt drive system for more accuracy if needed :)

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Sun Mar 21, 2010 9:29 am
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Post Re: My dolly projet
bziegler wrote:
FINISHED :)


I see you used inline skate wheels on the side but what are those running wheels? they look bigger than a skate board wheel?

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Mon Mar 29, 2010 8:04 pm
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Post Re: My dolly projet
unozig wrote:
bziegler wrote:
FINISHED :)


I see you used inline skate wheels on the side but what are those running wheels? they look bigger than a skate board wheel?


the store I've been had a lot of wheel choise !
Depending of the style (freestyle, speed, freeride...) there is different size.

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Mon Mar 29, 2010 10:22 pm
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Post Re: My dolly projet
I'm measuring the voltage at the motor level.
By this i can control my speed + or - accurately !

I've took the time that the dolly makes to travel 1meter long.
I did this at 12,6V, 10v, 8v, 6v, 4v, 3v (Lower it starts to get eratic)
And for all my motor speeds (1rpm, 2, 5, 10, 50, 100, 300).

So on XLS i've i curve that helps me find the correct speed.
I also can set the real complete lenght of my dolly and it give me time to travel for all voltages/motor.

In fact i've done a complete XLS document that i can open on my Iphone.
I just give it the real length of my subject (5h hours), the sequence i want (20sec).
Give me me frame number and an interval.

I can also enter the pan or and tilt i want to do why the milapses head. and he give me the correct values.

Then i read the Dolly data to choose the good motor speed and voltage.

Not as good as CamBlock but cheap ;)

You can download it there : http://www.bziegler.com/ftp/dolly/timelaps.xls
Of course it works only for my setup ! But can help you making yours ;)

For my Iphone i've bought the Quickoffice app.
I've tested a lot and this one is great ! I can use the XLS offline ;)

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Mon Apr 05, 2010 4:19 am
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Post Re: My dolly projet
excellent job on the video!! i looked at servocity but they have soo many parts to choose from. do you have a list of what you bought? i found a new in box meade autostar that has the telescope and tripod for about 175 dollars. telescope is of no use to me but do you think the auto arm is worth 175?


Mon Apr 05, 2010 1:27 pm
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Post Re: My dolly projet
justin huffman wrote:
excellent job on the video!! i looked at servocity but they have soo many parts to choose from. do you have a list of what you bought?

Just arrived this minute I kid you not ! :D

902MSD Dual Servo Driver http://www.servocity.com/html/dual_servo_driver.html
ESC-7.2-24 Precision Digital Speed Control http://www.servocity.com/html/precision ... ontro.html
GPG845-BM Gearmotor Gearbox http://www.servocity.com/html/gearmotor_gearbox.html
RZ12-3000-1RPM 1 RPM Gear Motor http://www.servocity.com/html/1_rpm_gear_motor.html


Attachments:
Gearmotor_Gearbox_with_controller_schematic.jpg [38.16 KiB]
Downloaded 776 times

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Mon Apr 05, 2010 2:38 pm
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Post Re: My dolly projet
dustin wrote:
Quote:
Just arrived this minute I kid you not !


o.k., I'm really gonna call Servocity now and ask for a cut ;)


and ask for a discount for me as they have 2 black wires coming out of the speed precision control box ! and sent me 2 spare black ones to attach to the motor !! Now I have to figure out which is the +ve one before I do any damage. :evil:
Any idea which one should be red ? I take it the red spare cable should be attached to the +ve terminal on the motor?

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Tue Apr 06, 2010 1:49 am
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Post Re: My dolly projet
unozig wrote:
dustin wrote:
Quote:
Just arrived this minute I kid you not !


o.k., I'm really gonna call Servocity now and ask for a cut ;)


and ask for a discount for me as they have 2 black wires coming out of the speed precision control box ! and sent me 2 spare black ones to attach to the motor !! Now I have to figure out which is the +ve one before I do any damage. :evil:
Any idea which one should be red ? I take it the red spare cable should be attached to the +ve terminal on the motor?


if this is the wire going to the motors you can plus them either way !
I do it to change the dolly move direction !

You should add shutdown buttons as in my video (1.47min on the video http://vimeo.com/9179128 ) !
Don't let the motor force when at the extremes position of the dolly !

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Tue Apr 06, 2010 2:05 am
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Post Re: My dolly projet
bziegler wrote:
Maybe in a model strore ?
I'll find something for sure but it has to be easy to mount on servocity part :)

I'm so exited :)


I see you got a plastic? pulley wheel attached with a wing nut to the shaft ! How did you do that as the shaft has no thread?

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Tue Apr 06, 2010 4:34 pm
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Post Re: My dolly projet
Arg no easy to explai. With my bad English :(
did you do that as the shaft has no thread
In the version I received (the motor gearbox) it was not a shaft but a tube (empty cylinder).
So i ve used a shaft to handle the pulley as a sandwish !!

Ho dear i not sure this is english :(

i've bought a second motor gearbox a few days ago. They have change that empty tube by a shaft (cylinder).
I havent figured out how to put the pulley om yet :( maybe I'll replace that shaft by a cylinder !

I'm really busy theses days but I'll try to take a pict. Better than bad english ;)

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Nikon D800 - Canon 5DMkIII- scalped 10.5 - 15mm sigma - 14/24 - 17/35 - 24/70 - 70/200 - 28/300 105 macro - 50 f1.4 - 85 f1.4- 24 f1.4


Tue Apr 06, 2010 5:08 pm
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Joined: Fri Apr 03, 2009 6:15 pm
Posts: 832
Location: Middle Earth
Post Re: My dolly projet
Merci beaucoup, a picture is worth a thousand words !

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Canon 5D MkII, Canon 50D, EF 15 f/2.8 Fisheye, EF 24-105 f/4 L, Nikon 50mm f/1.8 AF-D, EF 100 f/2.8 Macro, EF 300 f/4 L, PClix,


Tue Apr 06, 2010 5:40 pm
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Joined: Thu Apr 29, 2010 7:44 am
Posts: 46
Location: Grand Rapids, Michigan, USA
Post Re: My dolly projet
Just ordered everything as posted above from Servo City. Thanks!

How did you attach the pully?? Is it self explanatory once the gearbox arrives?

I will post photos in a new thread once everything arrives.
:D

db

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Mon May 10, 2010 12:46 pm
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Joined: Fri May 02, 2008 12:18 am
Posts: 161
Post Re: My dolly projet
From script to screen as it were....beautifully made and shot.


Mon May 10, 2010 7:45 pm
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