i came to this forum not from a timelapse perspective but a more real time application for DSLRs. I can't afford the Kessler Cineslider with motor and controller. So i was familiar with the Arduino and what can easily be achieved. That led my to some amazing TL films. And now I "Need" to try this myself!
After some time researching different "dolly" systems, and lots of DIY projects which end up not giving enough details on hardware, motors etc.
Luckily, I have a surplus metal place up the street. I can buy Aluminum rods, extrusions, blocks for $2.15 LB. For my first attempt, I happen to already have a nice, rigid 5' aluminum extrusion I'd like to use.
I like Jay's design, and have watched his videos. I ordered I believe the same motor he uses in the Dynamic Perception Timelapse Dolly Stage Zero, a Dayton 8.75 RPM Gearmotor from Grainger. Not having much experience yet, I might as well follow in the footsteps of the expert:-)
So, there are a lot of surplus motors out there. in San Diego, we have several electronic liquidators. So I would appreciate some guidance, and affirmation if I am correct.
In the Dayton motor example, we have 8.75RPM, It is 1 amp power and generates 656 oz.in.
It clearly works in this application. Now if I go looking for other motors, for future projects, I'm guessing in the 8-10 RPM range is good. Faster is fine if I ratio it down with gears or pulley.
Is the key the 656 oz. in.? Is this the amount of power we need to move a dolly?
I have seen some motors that have the right RPMS, but don't specify the torque. But show say 0.10 amps at 12v. Can I conclude that this motor would be way underpowered for our application? Being 1/10th the amperage of the Dayton? Is that a fair appraisal?
Would as a rule of thumb when digging through a box of motors pay more attention to the AMPS as a guide? 4 amps would be overkill, while a 500 milliamp DC motor could not pull the dolly properly?
Is there a similar ballpark spec to look for regarding a stepper? I think my second project, a pan head would be a stepper motor.
While looking at the Kessler system, I noticed they offer 4 motors, described as 1:100, 1:200, 1:500 and a 1:1000 gear ratio. The 100 being for realtime moves, and the 500 and 1000 for TL. Am I confused in not understanding that since they don't specify the original RPMs of the motor, how can we compare thier 1:500 motor to another 1:500 geared motor? I did figure out which motor they sell in the elektraDRIVE 500 Series Motor Pod, can't find a supplier in the US but several sellers in the UK, it is a 940D SERIES PLANETRY (EPICYCLIC) METAL GEARBOX, 940D5161 (4.5v - 15v) RATIO 516:1, 21 RPM @ 12v 0.837 amps, I tried to calculate the torque but found 3.3nM???
So am I close now in understanding in the DC arena that something close to 1 amp will do the trick? And as attractive as some other motors may seem, a 200 milliamp motor is not going to work?
Sorry to go on so long. My head is throbbing trying to make sure I'm getting adequate hardware, and not wasting money.
And to Jay, keep up the great work! I'm an example of someone who crossed you path, got excited by your passion, and now I'm taking my own timelapse journey, soon at least:-)
So my hope is to build a test (inexpensive) rig for timelapse, then pursue a faster motor for regular shots. Maybe a pan head.