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Old 04-10-2011, 01:50 AM #1
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Default Making better and more precise...

Hi!
I'm working with a cheap homemade laser projector that uses 2 hard disks actuators, works with sine waves and I am trying to make it so better and precise as I can.. I know i can't do much to make it precise because they are very open loop motors, but i'm trying to get the better results.

For the start, i want to know.. What i need to do for make a circle? I mean, between which frequencies should I get a circle? I think i need to play these frequencies and then adjust the rubber bands to get the circle...

Thanks for all!


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Old 04-13-2011, 11:22 AM #2
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Default Re: Making better and more precise...

I'm not sure I understand.

Last edited by carmangary; 10-10-2011 at 02:30 AM.
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Old 04-13-2011, 05:35 PM #3
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Default Re: Making better and more precise...

2 sine waves at the same frequency from function generators one leading by 90 degrees in theory should produce a circle.
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Old 04-13-2011, 11:15 PM #4
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Default Re: Making better and more precise...

Quote:
Originally Posted by carmangary View Post
Why not just spend the $80 and get a cheap pair of galvos?
Because i don't have $80

NetGod3Com: I tried to get the circle with same frequencies but is a little hard to get it adjusting
the rubber bands, so I will adjust a little the wave generator. Thanks!
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Old 04-14-2011, 12:08 AM #5
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Default Re: Making better and more precise...

Quote:
Originally Posted by Sourcegeek View Post
Hi!
I'm working with a cheap homemade laser projector that uses 2 hard disks actuators, works with sine waves and I am trying to make it so better and precise as I can.. I know i can't do much to make it precise because they are very open loop motors, but i'm trying to get the better results.

For the start, i want to know.. What i need to do for make a circle? I mean, between which frequencies should I get a circle? I think i need to play these frequencies and then adjust the rubber bands to get the circle...

Thanks for all!
All you need to make a circle is one small motor... with a mirror that is
not 100% perpendicular with the motor shaft. Then shine a laser
on the mirror while the motor is running and you will get a refected
circle on a wall...
The effect is also known as the time tunnel if you have some smoke
or fog in the room..


Jerry
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Last edited by lasersbee; 04-14-2011 at 12:59 AM.
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Old 04-14-2011, 12:19 AM #6
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Default Re: Making better and more precise...

Quote:
Originally Posted by lasersbee View Post
All you need to make a circle is one small motor... with a mirror that is
not 100% perpendicular with the motor shaft. Then shine a laser
on the mirror while the motor is running and you will get a refected
circle on a wall...
The effect is also known as the time tunnel if you have some smoke
or fog in the room..


Jerry
Well, the question was how to use the HDD actuators to scan a circle, not how to make a circle.

Open loop motors aren't exactly known for their precision; you can't get much out of one. Then again, it's a good start. Consider moving up to a set of 20kpps galvos soon. :P

In any case, the circle drawing signal is two sine waves, 90 degrees out of phase in relation to each other (or was it in phase with each other)? Either way, it's one of those two.
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Old 04-14-2011, 12:24 AM #7
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Default Re: Making better and more precise...

^^^ that is true. but in my experience people some times dont think of the easiese solution to a problem first. that is a lot of work to do a circle. if you notice in the op that scanning isn't what he is trying to achieve. and if you read the OP's 2nd post he says he doesnt have the money for galvos.

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Old 04-14-2011, 12:38 AM #8
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Default Re: Making better and more precise...

Quote:
Originally Posted by chipdouglas View Post
^^^ that is true. but in my experience people some times dont think of the easiese solution to a problem first. that is a lot of work to do a circle. if you notice in the op that scanning isn't what he is trying to achieve. and if you read the OP's 2nd post he says he doesnt have the money for galvos.

michael.
Well, I didn't say he had to move up. I was just suggesting it as an easier solution, simply because they have feedback.

In any case the OP wants to do more than just draw a circle. If he wanted to just draw a circle then the tunnelgun would be fine.

In this case he's actually wanting to scan a pattern using the HDD actuators (in this case, a mere circle). Of course, that could be done with a tunnelgun, but you really can't do more than just a circle beyond that.
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Old 04-14-2011, 12:43 AM #9
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Default Re: Making better and more precise...

in his case i would recommend a 3 or 4 motor spiro with a pot for each motor


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Old 04-14-2011, 01:29 AM #10
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Default Re: Making better and more precise...

Quote:
Originally Posted by goninanbl00d View Post
Well, the question was how to use the HDD actuators to scan a circle, not how to make a circle.

Open loop motors aren't exactly known for their precision; you can't get much out of one. Then again, it's a good start. Consider moving up to a set of 20kpps galvos soon. :P

In any case, the circle drawing signal is two sine waves, 90 degrees out of phase in relation to each other (or was it in phase with each other)? Either way, it's one of those two.
The 1st post actually reads....
Quote:
For the start, i want to know.. What i need to do for make a circle?
So I gave a simple inexpensive way to make a circle...


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Old 04-14-2011, 01:39 AM #11
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Default Re: Making better and more precise...

Yeah but he has been at this hard disk galvo experiment for some time (and threads, too) now,
I think the circle on the wall is not his ultimate objective, I think he just wants to calibrate
his DIY galvos with a circle....

A tunnel gun is useless to him.
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Old 04-14-2011, 01:42 AM #12
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Default Re: Making better and more precise...

i think before we all start arguing and assuming what the op wants, we should wait for him to reply.

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Old 04-14-2011, 11:07 PM #13
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Default Re: Making better and more precise...

Thanks for all your replies, but, anselm found my real problem
Quote:
I think the circle on the wall is not his ultimate objective, I think he just wants to calibrate
his DIY galvos with a circle....

A tunnel gun is useless to him.
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Old 04-15-2011, 02:05 AM #14
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Default Re: Making better and more precise...

excellent!!! now that the problem is solved... its video time lol...


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Old 04-15-2011, 02:10 AM #15
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Default Re: Making better and more precise...

The topic is solved, but not my problem
That's not solution for my problem, its a little hard because i'm using different voltages for each amp, so.. It is not a perfect circle haha..
I'm planing to do a simple lasershow with help of Adobe Audition or any other, so, i need to calibrate the channels to get a more precise shapes =/

Do you know any other software for generating sounds or frequencies? Thanks
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Old 04-15-2011, 02:47 AM #16
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Default Re: Making better and more precise...

I think LFI works with audio. Look at the first topic in this forum for how to rig up something with a sound card.
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