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21
Electronics / Re: battery pack charger - DIY
« Last post by washb0ard on July 24, 2014, 10:40:46 AM »
Nimh
22
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?
23
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?
24
Mechanics and Construction / Re: Microphonestand-robot
« Last post by Gededyr on July 24, 2014, 07:00:39 AM »
What I would do Is get some high torque low speed motors and put them in a square frame. about 4 inches biger than the diameter of a mic. stand then get an aluminium sheet for the top and drill 2 holes and other 2 holes on the mic. stand and then bold them together. If you need help with the design and materials send me an email at: [email protected].


That is a great idea!

But I thought about the design a little, and came across the idea of building a robot arm like this: http://www.dfrobot.com/index.php?route=product/product&path=37&product_id=192#.U9DoCfmqmFW
but with this http://www.thomann.de/gb/km_19695_300.htm instead of the robot hand, to mount the microphone.

Thanks for the email. I might write you a mail :)

Not to throw added complication at someone building their first robot but....this might be a good application for an omni-directional platform.
Here are some links:
https://www.youtube.com/watch?v=Z0lUTMBbu9A
https://www.youtube.com/watch?v=9GQ0lPGDC1w
http://www.robotshop.com/en/3wd-100mm-omni-directional-kit.html

Is noise a concern? Most motors/drives are going to produce audible noise.

How do I build something that can hold a microphone and moove it around a little, so I can moove the microphone from the control-room?
Not exactly sure what you are asking for...perhaps you can be a little more specific. Are you wondering what a system to do this would need, looking  for ideas, or need help designing and finding specific components?


How would you do the build with a omni platform?
Noise is not a concern because I will only do placement changes in the sound-check. the stand will be used for a guitar cabinet, witch will probably burst out 100dB of guitar tones.

In the studio I sit in the control-room with the mixing desk and the speakers, and in another room will the guitar cab. play. So I need to control the robot stand from the control room to hear the changes in the sound
25
Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by jkerns on July 24, 2014, 06:54:08 AM »
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.
26
Mechanics and Construction / Re: Microphonestand-robot
« Last post by DiegoChavez on July 23, 2014, 10:21:05 PM »


omni directional wheels are definitly a great idea. the robot marketplace sales some good ones, (I have used them for one robot and they work well) . here is the link: http://www.robotmarketplace.com/products/omni_directional_wheels.html


27
Mechanics and Construction / Re: Microphonestand-robot
« Last post by bdeuell on July 23, 2014, 08:31:10 PM »
Not to throw added complication at someone building their first robot but....this might be a good application for an omni-directional platform.
Here are some links:
https://www.youtube.com/watch?v=Z0lUTMBbu9A
https://www.youtube.com/watch?v=9GQ0lPGDC1w
http://www.robotshop.com/en/3wd-100mm-omni-directional-kit.html

Is noise a concern? Most motors/drives are going to produce audible noise.

How do I build something that can hold a microphone and moove it around a little, so I can moove the microphone from the control-room?
Not exactly sure what you are asking for...perhaps you can be a little more specific. Are you wondering what a system to do this would need, looking  for ideas, or need help designing and finding specific components?
28
Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by bdeuell on July 23, 2014, 08:07:09 PM »
I suspect the problem you are having is you are not measuring the correct diameter. With your equation you would need to measure the pitch diameter which is somewhere between the root and the tip of the gear teeth.

If you are measuring the outside of the gear you need to use: diametral pitch=(number of teeth + 2)/(outside dia)

I recommend you measure the largest gear you have that has the same pitch (this will minimize he effect of error in your measurement). better yet measure several gears and make sure your numbers check.

Also they could be metric gears which are measured in module (circular pitch) which is equal to (pi)/(diametral pitch). Keep in mind you will also need to convert units to metric.
29
Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by DiegoChavez on July 23, 2014, 06:40:45 PM »
what you have to do is find a caliper and measure the exact diameter of your gear and then make the math. they sell calipers for $25 at radioshack if you don't live near one the same prices are in amazon.com.
30
Mechanics and Construction / Re: Microphonestand-robot
« Last post by DiegoChavez on July 23, 2014, 06:17:37 PM »
What I would do Is get some high torque low speed motors and put them in a square frame. about 4 inches biger than the diameter of a mic. stand then get an aluminium sheet for the top and drill 2 holes and other 2 holes on the mic. stand and then bold them together. If you need help with the design and materials send me an email at: [email protected].
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