[dorkbotpdx-blabber] video dolley is working

[Tom Frisch]

Thanks for your help guys, I've got the dolley working well enough to try it out tonight.

I posted a test clip that shows the effect I'm going for, it's at :12 in.

https://vimeo.com/63206403

password is brian

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Tom Frisch  /  t...@tom11.com  /  mobile: 503.473.2801  /  www.tom11.com

[Jerry Biehler]

What kind of camera are you using?

-Jerry

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[Doug Ausmus]

Very cool!

[Zach Archer]

Nice work!

-- Z

[Tom Frisch]

Jerry: I'm using a Canon C300, which is a fancy video camera that does great in low light, has a large(ish) sensor, takes Canon stills lenses, and costs way too much.

Jim: yes, the stepper is getting a little warm, and there is a pot to adjust current.  I haven't mucked with it, but will try. 

Here's a photo of prototype v1.  I used some old spectra fishing line winding on a capstan on the stepper to control position.  It works, but as it turns it often clicks on and off the bumps on the pulleys from the 3D printing layers.  The stepper also feels a bit notchy, probably the full steps from the controller.   I also will be switching over to a pololu with microstepping for the next iteration, so that should give me some smoother motion.  Obviously the electronics need some tidying up, and an interface beyond on/off and speed pot.  End stops allow for endless ping-pong motion, I'd like to add a joystick or something to get better control, but that will also require that I figure out the AccelStepper library that Paul turned me on to as well.

[Jerry Biehler]

Neat camera. 

Steppers are always rough to some degree, that is why I use servo motors for almost everything. Micro stepping will help. That is what it is intended to do. Keep in mind that the higher the micro step count the lower available torque so you may have to adjust your acceleration setting based on your load. At Laika we ran 10uSteps per step, it seems to be a good trade off area. The cheap little drives skip 10 and jump to 12uSteps if I remember. 

I want to put together a camera slide as well sometime. I just picked up a 5D Mark II and want to try some night time lapse. 

-Jerry

On Apr 4, 2013, at 4:55 PM, Tom Frisch <t...@tom11.com> wrote:

Jerry: I'm using a Canon C300, which is a fancy video camera that does great in low light, has a large(ish) sensor, takes Canon stills lenses, and costs way too much.

Jim: yes, the stepper is getting a little warm, and there is a pot to adjust current.  I haven't mucked with it, but will try. 

Here's a photo of prototype v1.  I used some old spectra fishing line winding on a capstan on the stepper to control position.  It works, but as it turns it often clicks on and off the bumps on the pulleys from the 3D printing layers.  The stepper also feels a bit notchy, probably the full steps from the controller.   I also will be switching over to a pololu with microstepping for the next iteration, so that should give me some smoother motion.  Obviously the electronics need some tidying up, and an interface beyond on/off and speed pot.  End stops allow for endless ping-pong motion, I'd like to add a joystick or something to get better control, but that will also require that I figure out the AccelStepper library that Paul turned me on to as well.

<photo-(10).jpg>

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Tom Frisch  /  t...@tom11.com  /  mobile: 503.473.2801  /  www.tom11.com

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