Machsupport Forum

General CNC Chat => Show"N"Tell ( What you have made with your CNC machine.) => Topic started by: Picengraver on May 11, 2013, 06:29:11 AM

Title: Laser Diode Lens Test
Post by: Picengraver on May 11, 2013, 06:29:11 AM

While fine tuning the focus of a new lens for my laser diode the other day, I decided to test how fine a spot the lens was focusing too.  This is a dried pinto bean with the maximum height of the letters at .025 inches / .635 mm high.  I think I could have done even smaller engraving if I had reduced the laser power more, but I ran out of play time.  :D

John

Title: Re: Laser Diode Lens Test
Post by: Chaoticone on May 11, 2013, 11:15:42 AM

Unreal!  :o  That's just tiny!  Take a picture of a set of calipers set to .025 for a visual.............. that picture is great but doesn't do it justice.  Maybe stretch a hair across the writing long ways?

Brett

Title: Re: Laser Diode Lens Test
Post by: Picengraver on May 11, 2013, 03:35:43 PM

Thank Brett,
Good advice.  Here's a couple more pics - best I can do with a makeshift closeup lens.

John

Title: Re: Laser Diode Lens Test
Post by: Picengraver on May 11, 2013, 03:39:07 PM

Hey Jeff,
Post your rice grain pic.

John

Title: Re: Laser Diode Lens Test
Post by: RICH on May 17, 2013, 07:15:19 AM

Like those small pic's.
BTW, smallest letters you can achieve will be based on the thickness of the lines making up the letter or number.
RICH

Title: Re: Laser Diode Lens Test
Post by: PicengraverToo on May 19, 2013, 08:45:05 AM

Quote from: Picengraver on May 11, 2013, 03:39:07 PM

Hey Jeff,
Post your rice grain pic.

John

Darn, I don't know how I missed this thread and your request John.  :-[

Here it is. I used an old version of Bobcadcam to generate the code and hot melted the grain of rice to a piece of anodized aluminum. Good thing my name is not to long.  ;D

Jeff