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Unread postAuthor: POLAND_SPUD » Tue Jan 26, 2010 8:23 am

the whole stepper motor vs servo discussion is a bit moot
yeah sorry about that... but I think that you'd have to spend that ~70$ on a turret so why not add 30 $ and turn it into something that could be used also at longer ranges or with different guns

something tells me that USGF was on the right track
get a small pan tilt web or security camera. Remove the existing motors. Likely to be miniature stepper motors. Build a small interface board to drive larger stepper motors
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Unread postAuthor: dewey-1 » Tue Jan 26, 2010 9:30 am

These Pan & Tilt setups seems fairly reasonably priced.
It includes servos as well. I would thinks this setup should have enough
torque capability for you purpose. The PT-2 model especially.

http://www.endurance-rc.com/pantilt.html#pt2
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 26, 2010 9:39 am

dewey-1 wrote:These Pan & Tilt setups seems fairly reasonably priced.
It includes servos as well. I would thinks this setup should have enough
torque capability for you purpose. The PT-2 model especially.

http://www.endurance-rc.com/pantilt.html#pt2


Nice find!

It's a lazy way out but hey, I worked for the money didn't I?
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Last edited by jackssmirkingrevenge on Tue Jan 26, 2010 9:41 am, edited 1 time in total.
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Unread postAuthor: POLAND_SPUD » Tue Jan 26, 2010 9:39 am

OMG just 30$ ? nice find
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 26, 2010 9:42 am

POLAND_SPUD wrote:OMG just 30$ ? nice find


It's higher with the servos included, but you don't care about that :P :D

Paycheque due on Friday and I think I know where a fraction of it is going :D
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Unread postAuthor: POLAND_SPUD » Tue Jan 26, 2010 9:59 am

I think I know where a fraction of it is going
hmmm... care to explain ?

but you don't care about that
well even if you will buy them with servos it could be upgraded later... have you considered buying them off ebay ?

I can understand why you prefer to use RC servos... that really is the simplest possible way (but not the best)

just test accuracy at, let say, 20 m or 25 m once you finish it... I wonder how accurate/inaccurate it can be
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Unread postAuthor: dewey-1 » Tue Jan 26, 2010 10:14 am

Here s a cheaper variation.
If you snoop on those robotic sites I posted earlier you will find a lot of potential projects.

I may have to revive my CP-88 mousetrap!

http://www.trossenrobotics.com/store/p/ ... ervos.aspx
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Unread postAuthor: Ragnarok » Tue Jan 26, 2010 11:08 am

POLAND_SPUD wrote:just test accuracy at, let say, 20 m or 25 m once you finish it... I wonder how accurate/inaccurate it can be

I think that may be more be a matter of the accuracy of the mounted BBMG rather than the servos.

Either way, I don't know what the average resolution or accuracy of a servo is, but even if you're only accurate to the nearest degree, that should be about good enough to hit a man-sized target at 25m.

EDIT: I've done some poking around, and it appears that 0.5 degree resolution is about normal - for a 60 degree servo, at least.

To me, that works out as "good enough".
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: POLAND_SPUD » Tue Jan 26, 2010 11:56 am

@rag
yeah I know it's not that bad for a man sized target at 20 meters ... sure that's 30 moa... I am sure it will be enough for that purpose...

however, that's not enough if you want to build a turret that can rotate full 360 deg and and achieve 1 MOA accuracy
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 26, 2010 12:03 pm

POLAND_SPUD wrote:hmmm... care to explain?


If I buy the software + controller and pan and tilt module (thanks Duane for the research! I never would have thought of looking for a pre-made one!) and a webcam, which it seems is more than achievable for less than $300 - I'll basically just need to add the gun :D

I think that may be more be a matter of the accuracy of the mounted BBMG rather than the servos.


Rag makes a good point. In my case, I'll be either using this indoors or in the garden, so definitely not more than 10 metres range* so the above setup is more than adequate for my purposes.

*Though if it works I'll try to interest the CEO in having the system installed at work :D

I may have to revive my CP-88 mousetrap!


I think you should :D
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Unread postAuthor: Brian the brain » Tue Jan 26, 2010 4:27 pm

Anybody got a link to one of them home made night vision devices??


Any left over Branch Davidians would probably pay bigtime for something like this.. :D


This stuff becomes scary when you combine it with more potent weaponry..

It would be helpfull if you feel like playing paintball and no one else wants too...Sharpen up your reflexes a bit.. :roll:
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: ramses » Tue Jan 26, 2010 4:35 pm

Brian the brain wrote:Anybody got a link to one of them home made night vision devices??


linky
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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 26, 2010 4:51 pm

You can get IR sensitive webcams on ebay for peanuts, with enough IR to flood the room you could have an intruder walk around in the dark while a single red laser follows him around, and all that can be heard above the whirr of the servos is a childish AI voice going "I can see you!" :D
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Unread postAuthor: dewey-1 » Tue Jan 26, 2010 6:15 pm

JSR;

Check out this site for security cameras and USB adapter.
This is the same stuff e-bay has!

http://www.dealextreme.com/details.dx/sku.26319

http://www.dealextreme.com/details.dx/sku.32765

I got the green JG-016 laser from them.
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Unread postAuthor: kenbo0422 » Wed Jan 27, 2010 9:22 am

You can take just about ANY cmos, CCD or whatever and use it with IR. I do it all the time. Some are modified by taking out the IR filter, but most of the time you can use a camera with it still in place. It just depends on the intensity of the IR light you use to light up your target. Buy a cheap video camera, used, and you'll be saving yourself a lot of money
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