GM20s

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05-19-2009, 08:44
gottaluvlasers

GM20s

im getting a few GM20s (used) but in perfect condition. i dont have them yet, but will be very shortly. just wanted to give a heads up if anyone needs any.

-Marc
05-19-2009, 15:30
Docjohn

GM 20

Quote:

Originally Posted by gottaluvlasers

im getting a few GM20s (used) but in perfect condition. i dont have them yet, but will be very shortly. just wanted to give a heads up if anyone needs any.

-Marc

Hey Marc: ;)

Excuse my ignorance. What is it? All I could find is this.

http://www.solarbotics.com/products/gm20/

John :):):)
05-19-2009, 16:43
mixedgas

[QUOTE=Docjohn;97787]Hey Marc: ;)

Excuse my ignorance. What is it? All I could find is this.

http://www.solarbotics.com/products/gm20/

Not quite, try this: used in beam tables to move beams around:

http://www.gs-scanners.com/pdfs/data..._736-49506.pdf

Steve
05-19-2009, 18:08
gottaluvlasers

hey doc john-

not ignorance at all...

like steve posted, they are an "older" type of beam table actuator. GREAT for beam tables and also great for shutters. they work proportionally to the input V. they are also bi-polar.
0V- arm is "home"
+12V arm is fully Right.
reversed polarity from 0, arm can move opposite direction.

i think they were also used or still used for slower beam scanning. not good for graphics, great for beam work though.
05-19-2009, 18:17
mixedgas

reversed polarity from 0, arm can move opposite direction.

i think they were also used or still used for slower beam scanning. not good for graphics, great for beam work though.[/QUOTE]

They were a slow pen motor for chart recorders. They have a tangent corrected response for moving a pen on paper.

Steve
05-20-2009, 01:40
Docjohn

Thanks guys ;)

John :):):)
05-20-2009, 02:42
QUAZAR

Also usefull for scanning CuBr beams.
05-20-2009, 05:31
ImageLight

How much are you asking for them?

Mark
05-20-2009, 10:41
Laserman532

I have 10 of them in unused condition but no less than 80.00 ea. I also have 2 driver cards that drive 8 gm-20's. Sorry to thread jack, i also have arms, mirror holders and a few mounts. They sold for 125.00 years and years ago. I use to buy them by the case. How much are you selling yours for marc?
05-20-2009, 11:57
gottaluvlasers

pat-

youre fired!:mad:

:) playin...

these are prob gonna be around the same price. $80-$90. i wont know until i get them in. the invoice is in with the order. which reminds me....should be here today....

-Marc

oh pat....screw you for hijacking!! :p
05-20-2009, 18:17
ImageLight

Gotta love the friendly competition.... Feel the love. :eek::D>:)
05-21-2009, 05:20
gottaluvlasers

pat, competetition?

PLEEAASE!!!! LOL...

he is MUCH better than me!

his mounts SUCK though!! :p:D:p HAHAHAHAHAHA

-Marc
05-26-2009, 04:03
gottaluvlasers

ok, sorry bout this guys...

but i got 4 gm20's (less than i thought) and they are going to be about $100. they re technically "used" as in, not new...but are pretty much brand new. i actually think these 4 are already spoken for also. i was supposed to be getting about 15. but only got 4. :(

im gonna try to get more ASAP.

-Marc
05-26-2009, 07:21
Laserman532

i will do an inventory, stand by for announcement, I have one pm to answer first.
05-26-2009, 14:17
Laserman532

1 Attachment(s)

OK - I have 11 kits GM-20's

What the hell is A GM-20 Kit Pat?

1 - new never used General Scanning Galvo GM-20
1- new GM-20 mounting bracket with hardware (black anodized)
1- GM-20 style arm flag 2" length with set screw (black anodized)
1- Bonus! electrical wire with 2 connectors for those darn little pins 2' long

I have only 11 of these KITS.

They are first come first serve. Then they are gone!

$125.00 per KIT Paypal laserman@bendcable.com

FREE SHIPPING IN THE USA

INTERNATIONAL BUYERS ADD $15.00 for PRIORITY USPS
05-26-2009, 14:21
allthatwhichis

http://www.photonlexicon.com/forums/...pictureid=1360

Uh oh, talk about a thread jack...
05-26-2009, 14:25
Laserman532

Take that bitches!!!! Lololol - i'm out to destroy marc!!!! Muahahahahahahhaha he cant come up with the goods...i will!!!!!:d:d:d:d:d:d:d
05-26-2009, 16:03
Laserman532

1 Attachment(s)

OH COOL - I just found some of these!

These are Mirror mounts for the GM-20 Shaft. Picture shows 2 of them so you get a perspective. I am selling one for $25.00 including shipping. You can not make them this cheap. These mounts will hold MONSTER MIRRORS. 1"x1" mirrors would be fine, but .5"x.5" would be better!
05-26-2009, 16:15
danielbriggs

*ALERT ALERT* Silly question incoming...

Assuming I purchase said kit, or attain a GM20 by other means; do I need an amp or driver of some sort to do the 'shuttering' ? If so; what, where, when and how? :D

Or is there a better method to add a shutter? A relay connected to a mouse trap or a spring on a hamster perhaps?

Dan :)
05-26-2009, 16:25
Laserman532

Quote:

Originally Posted by danielbriggs

*ALERT ALERT* Silly question incoming...

Assuming I purchase said kit, or attain a GM20 by other means; do I need an amp or driver of some sort to do the 'shuttering' ? If so; what, where, when and how? :D

Or is there a better method to add a shutter? A relay connected to a mouse trap or a spring on a hamster perhaps?

Dan :)

That question I'll let some one else answer because I dont understand electronics and I dont use these for shutters anymore. I hire an Ethiopian to jump in and out of the beam path on command. (send hatemail to www.danielbriggs.com)
05-26-2009, 16:33
allthatwhichis

Quote:

Originally Posted by Laserman532

That question I'll let some one else answer because I dont understand electronics and I dont use these for shutters anymore. I hire an Ethiopian to jump in and out of the beam path on command. (send hatemail to www.danielbriggs.com)

At least you pay huh? :rolleyes:
05-26-2009, 16:57
Laserman532

8 kits left. If these dont sell I will move them over to www.microlaserlabs.com and increase the price to around $140.00. So get them now and save $$$$$$$:)
05-27-2009, 02:06
mccarrot

Can they be used as a safety shutter? or are there better (cheaper :o) solutions for shutters?
05-27-2009, 02:46
mixedgas

Quote:

Originally Posted by mccarrot

Can they be used as a safety shutter? or are there better (cheaper :o) solutions for shutters?

Gm20 is the shutter or fast beam table actuator of choice. Get them while you can , GSI is stopping production.

My projector has 4 for beam effects and two for shutters (argon laser, krypton laser)

Steve
05-27-2009, 06:26
buffo

Quote:

Originally Posted by danielbriggs

Assuming I purchase said kit, or attain a GM20 by other means; do I need an amp or driver of some sort to do the 'shuttering' ?

Yes. Most people drive them with a simple darlington transistor pair. DZ has a circuit that he's posted before... I'll see if I can get him to post it here. It's really very simple though. ;)

And Steve is right - this is probably the best component to use for a shutter. It's also the defacto standard in the business...

Adam
05-27-2009, 08:50
allthatwhichis

http://candlepowerforums.com/vb/imag...ies/paypal.gif
05-27-2009, 10:02
DZ

1 Attachment(s)

Here is the circuit that I use in my projector. Because I'm running my shutter on only 5V, I needed to add a relay to get just enough swing from the GM-20 to unblock the beam. Otherwise, you'll loose some voltage on a darlington transistor. I don't remember exactly what value I used for the capacitor that's in parallel with the GM-20, it may have been 10uf or something close to that, basically, it's there to eliminate a bouncing effect that you'll see without one there. Enjoy!
05-27-2009, 11:10
Laserman532

BUMPED FOR "6 Left" announcement:)
05-27-2009, 11:30
buffo

David;

Don't you think the 2n2222 has enough grunt to drive the GM-20 directly? Why add the relay if you don't need it?

Adam
05-27-2009, 11:40
DZ

Quote:

Don't you think the 2n2222 has enough grunt to drive the GM-20 directly? Why add the relay if you don't need it?

It could probably run it just fine, though you'd probably want to cascade two of them for the darlington effect, or just use a TIP122 darlington transistor. The problem with that is the voltage loss across the transistors, I needed a full 5V for my GM20 to clear the beam path and the relay provides the full 5V. It really just depends on your configuration, a shutter can be setup in so many different ways.
05-27-2009, 11:59
Laserman532

DZ...Thank you for posting your findings and designs on this thread. Greatly appreciated.

OBTW - BUMPED for the "3 Left" Announcement:)
05-27-2009, 13:38
danielbriggs

DZ/Buffo/Pat,
Looking at that circuit diagram, could I stick in 1N4001's, and a 47µF tantalum cap instead?
Mean's I've gorra go t'shop if not.

Is this the right tranny? Looks a bit small... http://uk.rs-online.com/web/search/s...duct&R=0295028

And is this thee right relay?
http://uk.rs-online.com/web/search/s...duct&R=4936458

Sorry to sound like a nagging bugger... electronics RELAY isn't my forté
...it's been one of those days... *DZ
05-27-2009, 13:55
DZ

Yes, that transistor will work and that relay will work. The 1N4001 will work just fine, I always use 1N4007's since I have about 3000 of them... 47uF will probably be fine, just depends, use it and it if seems too slow, then go with a lower value.
05-27-2009, 14:00
danielbriggs

Ta muchly DZ.
I have loads of lower capacitance ones, but they're all electrolytic.

Dan :)
05-27-2009, 14:02
DZ

The electrolytics will work just fine too!
05-27-2009, 14:34
MechEng3

1 Attachment(s)

What about this.....

This was sent to me from Bill. Works great...and you could vary the power to the load a bit. Plus is that the local rip-off shak will have the goods on hand.
05-27-2009, 15:04
Laserman532

Yeah, That little circuit shouldnt cost more than 30 or 40 dollars at ripoff shaque.

BUMP- "2 Kits" left.
05-27-2009, 15:38
mixedgas

Quote:

Originally Posted by MechEng3

This was sent to me from Bill. Works great...and you could vary the power to the load a bit. Plus is that the local rip-off shak will have the goods on hand.

I'd like a reverse diode across the GM20, and I put a 20-40 ohm resistor across the GM20 for damping.

Steve
05-28-2009, 01:59
Banthai

1 Attachment(s)

MechEng3 said

Quote:

This was sent to me from Bill. Works great...and you could vary the power to the load a bit.

Well if bill sent you that... he needs a slap on the back of the hand and be forced to eat a big bowl of Lasorbs for breakfast every day for the next 6 months :D

Both Sides of the GM20 are being driven by the 0v rail so it will never operate

also the 2n2222 transistor has a collector current of 800ma max so best to use a TIP120 as reccomended in mechs drawing

i also use a similar circuit but with an opto isolator prior to the base resistor to isolate the 5v and 10v

I think your drawing should look like this ... but even i could be wrong :eek:

all the best ... Karl
05-28-2009, 02:15
MechEng3

Thanks Karl...but it was meant to be a very easy and quick solution. Something that could be "dead bugged" and placed in use. Guess I will regress to using Pat B's method....it may be fault proof....no caps or opto-isolators.
05-28-2009, 02:41
Banthai

2 Attachment(s)

hehe .... yep simpler is better ... but i also like reliability and isolation of voltages

here is an updated drawing of what i currently have installed in my projector
this isolates the 5v also im using 15V instead of 12V but it works fine

all the best ... Karl
05-28-2009, 06:55
Stuka

Quote:

Originally Posted by Banthai

hehe .... yep simpler is better ... but i also like reliability and isolation of voltages

here is an updated drawing of what i currently have installed in my projector
this isolates the 5v also im using 15V instead of 12V but it works fine

all the best ... Karl

Karl -

Do you have a specific opto-isolator part number you would recommend for this application?

Thanks!
05-28-2009, 09:26
Banthai

Hi stuka

im using the very common 4N25 i also added an extra led in series with the opto led so i can have an on board indication that i have a signal

heres the data sheet and pinout

http://www.vishay.com/docs/83725/4n25.pdf

all the best ... Karl
05-28-2009, 10:52
Laserman532

3 Attachment(s)

BUMP to announce..."2 Kits" left

EDIT- these are UNIPOLAR DRIVER CARDS

Now I found something else. These are GM-20 driver circuit cards that drive 8 GM-20 actuators. I want to sell these but most of you guys dont do beam rails so I want to list them on ebay. They are new, purchased 10+ years, never had electricity applied to them, FLAWLESS I also found a power supply to drive the cards.

Question...How much are these cards cards worth each?

I have full documentation
05-29-2009, 14:10
Laserman532

gm-20 kits have shipped (all but one)

BUMPED for "2 Kits" left announcement - would ship early next week.

If anyone wants the cards they are $90.00 ea. including shipping in the US. thats only $12.00 per circuit ya cant build them that cheap! Copy of documentation included.
05-29-2009, 22:06
platinum

Quote:

Originally Posted by Laserman532

. . .If anyone wants the cards they are $90.00 ea. including shipping in the US. thats only $12.00 per circuit ya cant build them that cheap! Copy of documentation included.

If you throw in 8 GM20s, I'll toss you an extra $10 to make it $100. :D
05-30-2009, 09:01
Laserman532

Quote:

Originally Posted by platinum

If you throw in 8 GM20s, I'll toss you an extra $10 to make it $100. :D

as you can see by my photos...I was born ugly...not stupid:D
05-30-2009, 09:14
allthatwhichis

http://www.photonlexicon.com/forums/...pictureid=1094 Heh, I always thought of stupidity as something you get with age... http://www.photonlexicon.com/forums/...pictureid=1099 Like wisdom.
06-01-2009, 14:40
Laserman532

LAST CALL on the GM-20 Kits only "2 KITS" available
06-01-2009, 14:47
allthatwhichis

I got mine today! Thanks Pat! I just need to figure out how to mount the GM20 on this mount... :confused: :o

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