Beam Height needed for DT40pro's

[CRFultz]

Hi all
I'm starting my layout in AutoCad for my homebuilt projector, and I'm hoping someone can give me a ideal of the beam height needed to get my Z dims in the ballpark. I don't need a exact measurement but some ideal of a good point for the other components to be based off of. I have machined the blocks of aluminum for my lasers but I need to know what height the mounting plates need to be to hook up with the dichro's mounts and the DT40's.
I haven't ordered the DT's yet but probably will very soon. If need be, I can wait but I'm overly anxious to get started.

Thanks
Chuck

[Displaser]

Chuck,

Based on the set of DT40pro's I purchased from DZ earlier this year, the base plate is .25", and height to the center of the mirrors add an approx. .75" or 1", depending on which side of the scanner block your beam will enter from.

I'll post a photo later today.

Greg

[CRFultz]

Thanks Greg...thats just what I needed.
If my galvo's are on the left and my beam was entering from the right, would the lower galvo be the X?
Is this pic correct?
Thanks for your help

[ElektroFreak]

That's correct. X is horizontal movement, Y is vertical.

[Things]

You can fire the laser thru the Y galvo first if it'd work better for your application, it doesnt really matter.

[Displaser]

Chuck,

Based on your drawing, it looks like you are showing a .75" beam height - with the base plate, it's either 1" or 1.25" that you're working with.

Greg

[CRFultz]

Thanks guys, thats the info I needed to get me started

Chuck

[mixedgas]

Thanks guys, thats the info I needed to get me started

Chuck

Three additional concerns when picking a height.

concern alpha:

If you raise the galvos off the base, use a metal spacer of at least 1 square inch of area to aid in heatsinking, to transmit the heat back to the baseplate.

concern beta: If you are building your own red diode sources, there is the concern that the diodes must float electrically from the normally grounded baseplate.

concern charlie, if you ever change galvos, higher performance galvos have a smaller x mirror then the Y mirror and thus you need to go in X first.

From the pictures, your immune to charlie.


Steve

[daedal]

My adopted permanent solution is to make sure I have an MM1 right before the mirrors... that way I can move the beam up/down/left/right to aim it just right...

--DDL

[CRFultz]

My adopted permanent solution is to make sure I have an MM1 right before the mirrors... that way I can move the beam up/down/left/right to aim it just right...

--DDL

I'm trying to visualize what your saying.
Do you mean that you bounce the combined beam onto the galvo mirrors?
I was planning a straight green, reflect red and blue. I thought this would be the easiest to align.

Chuck