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Mechanics and Construction / Re: Microphonestand-robot
« Last post by Gededyr on July 25, 2014, 06:56:29 AM »
I really hope I'm not insulting anyone with my bad Paint-skills, but I made a little picture of my idea.. http://imgur.com/76wRgP6

If the microphones angle (horisontal) could be maintained regardless of how I moove the arm and could be controlled by a single joystick, that would be great! In my mind it would just be a matter of programming, or am I wrong?
Electronics / Re: Airsoft robot fireing system
« Last post by bdeuell on July 25, 2014, 05:08:46 AM »
They make relays directly controlled by the servo signal (no mechanical connection...other than the relay) that might be more reliable.

see: http://www.dimensionengineering.com/products/picoswitch
Mechanics and Construction / Re: Microphonestand-robot
« Last post by Gededyr on July 25, 2014, 01:17:10 AM »
I think my idea with the robot arm is what I need.
Now my concern is how to control it. It would be great to have the ability to take the robot with me. I work in different studios around, so I need to take it with me to the studio, and set it up pretty quickly, and control it via wifi maybe. some kind og wireless control would be the optimal.

So my vision for the robot is, I go to the studio with the robot in my bag or car, then I go to the recording room with a guitarist and hes guitar amp. I place the robot in front of the guitar amp and place a microphone on the robot-stand and gives the robot some power, then I go to the monitor-room/control-room and set up my control-surface (maybe my mac pro), connects to the robot, and then I'm good to go and ready for the sound check. Here I let the guitarist play through hes guitar amp and I listen to the microphone and move the microphone around the speaker on the guitar amp. I only need to move the mic some inches, so it wont run over any cables or so. When I've found the perfect spot for the microphone, I'll just let the microphone be where it is and press "record" :)

I hope that resolves any misunderstandings.
Electronics / Re: Airsoft robot fireing system
« Last post by gerard on July 24, 2014, 09:28:20 PM »
Remove the trigger and disconnect the 2 wires going to the switch. Attach some longer wires with a momentary push button/switch. Use a servo connected to the RC receiver to push the button. This is the easiest way :)
I have designed a robot in autodesk inventor pro 2015 but I don't know how to animate my design. I need a very basic animation. Forward, right,left,move a part up and then down. I don't have a clue of how to do this any ideas?
Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by bdeuell on July 24, 2014, 04:58:53 PM »
If you are trying to machine a larger bore in your pinion gear and press fit it onto your new motor it will need to be very precise. The tolerance on a interference fit for a shaft that small is probably less than a thousandth. If you use a drill bit to enlarge the hole there is a big chance it will be too large and will slip on the shaft or will be too small and you might break the shaft or gear trying to press it together. Brass is soft tho so you might get lucky and be able to machine the hole on the small side and still be able to assemble it. Typically the bore would be reamed to size, I would use a one thou undersized ream. You could try and glue the gear on but I wouldn't count on that lasting too long.
Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by jkerns on July 24, 2014, 12:09:43 PM »
With a little care you could drill the hole out in the old gear. But!!!! If you get the hole too far off center the wobble will make it bind / slip.  It's not impossible - you just need to work very carefully - and I suspect it's one of those "nothing to lose" situations.
Electronics / Re: battery pack charger - DIY
« Last post by washb0ard on July 24, 2014, 10:40:46 AM »
Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by pterrus on July 24, 2014, 10:13:16 AM »
Thanks so much for the replies everyone.

I suspect that pressing the gear you have off the shaft may be the easier solution.

Cut a slot in a bit of metal to fit behind the gear to give you something to pry against.
Let's say I succeed in doing this.  Now I need to find a motor with the right size output shaft to press it on to, right?  It certainly wouldn't work with the 4mm D-shaft output motors I was looking at.  Any recommendations on what motor to buy and how to attach the gear?
Mechanics and Construction / Re: Microphonestand-robot
« Last post by bdeuell on July 24, 2014, 10:05:29 AM »
Are you looking at building an arm instead of a mobile platform, or in addition to?

The omni directional platform is not very difficult to build mechanically (with the exception of the wheels...which I assume you would buy). Essentially you mount geared motors with an omnidirectional wheel on each at angles to each other, 90 degrees apart for a 4 wheeled version and 120 degrees apart for a 3 wheeled version. the rollers on the omni-wheels allow them to slide freely in the direction perpendicular to their driving direction. By driving each wheel at a particular velocity you can make the robot move in any direction and rotate all at once. The control part is a little more challenging but i'm sure there are tutorials out there that explain it as well as members here that would be willing to help. Essentially you would need an algorithm to calculate the required motor speeds to make your platform move in the desired direction...this isn't overly complicated just a little geometry and trig.

I think I have a good idea what you are trying to accomplish, what isn't clear to me is what kind of help you are asking for.

Some questions I have is will you need to be able to drive over obstacles such as cables/wires on the ground? Also how much weight will you need to carry, i know most mic stands have a heavy base for stability, can you get away with a much lighter structure to hold the mic?
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