my new motion control rig

Jason Miller said:
Nomadic, they're not steppers, they are just now starting to make 12v steppers, two of them are servos, and one is a 12 2.3 amp motor with 55 inch pounds, controlled by a motor controller hooked into a servo controller which is also hooked to the other servos, and my computer. I'm really shocked at how few motion control rigs are out there considering they are not that hard to build. with the servos so cheap, and the servo controllers working so well...
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Back in the 80s, several entrepreneurial SFX people tried using servos in place of steppers for motion-control work and the things were very susceptible to radio interference. Okay and "acceptable" when your rig is fifty pounds - not so funny when you have five-hundred or a couple thousand.

Beware placing too much trust in a servo operated motion-control rig.

e
 
the dolly motor isn't a servo the two servos are for the pan tilt,

I never thought of something interference, as everything is wired and nothing is wireless, if it happenes whats the best way to counter it.
 
Are the servo motors for pan/tilt continuous?

If not, how do you know their position....or you dont.

Also did you build the pan/tilt piece, or was it prebuilt and you purchased it?
 
shred444 said:
Are the servo motors for pan/tilt continuous?

If not, how do you know their position....or you dont.

Also did you build the pan/tilt piece, or was it prebuilt and you purchased it?
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the head is a servocity head and they work via degree, so I set a certain degree in and the servo knows where to go.

the dolly on the other hand is a motor hooked to a motor controller, hooked to the servo controller. it turns both ways at about 35 rpm, with 55 in pounds. with the 8.5 in sprocket, thats 4.25 inch from center, it cuts it down to about 12in pounds, of power, but ups the speed, with the bearings I have it isn't a problem to move it, however I'm still unsure how its going to handle the incline feature I incuded in the rig. I may get a 4 and 6 inch sprocket as well and make them swapable, less speed more power in predictable steps.

Jason
 
the camtram is pretty cool, but when all said and done it's just an over priced ladder dolly, there are other cheaper ladder dolly systems out there that cost much less and could be fitted with a motor just as easy, if you're not wanting to start from scratch.

Jason
 
well Im trying several I leaning toward one, but I really dont want to tell people untill I know for sure its the right one, its worked perfectly for all the tests and In a couple weeks I'll have it on set so I'll hopefully know for sure then.
 
used it in its first film yesterday, Will be using it on Friday for the green screen counter shots. all is well so far.

Jason
 
Kdawg I have a few shots from in on my reel
http://www.vimeo.com/1474922

its the two over head shots, one with the baby, and one on the green screen, its a thesis project for a friend, she hasn't done the comp yet, but it matches up.

the other is the very low shot looking up at the woman who is walking, seems to be looking for someone.

all the other :moco" shots on here whre done with floor markers a dolly, and a stopwatch.

Jason miller
 
welp I just got it put together in my living room so I know all parts will go to set monday, just got all the drivers installed onto my toshiba laptop. seems to be working like new. hope I'll have someone on set Monday to take pics of it and of Gary's hypercam
 
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