Page 3 of 14 FirstFirst 123456713 ... LastLast
Results 21 to 30 of 136

Thread: Some gears and testing for laser-ablating and -marking ...

  1. #21
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    Hi Adam,

    the last parts were made with a 20 Watt pulsed fiber-laser, not with the 85W-CW-laser.

    The results in steel are comparable with the CW- and pulsed lasers -- with other, more shiny/reflective materials the pulsed laser will be much more effective!

    The CW-lasers were "random" parts, I've got in exchange of some of my old gears and private developments, so it's mostly counted/paid in time and ideas, not money.

    The pulsed fiber-laser and galvoscanner in the showed setup was sourced and built in my day-job, so a totally different game -- this is my money-making job ... but I'll get it for my private use, when the next "updated" version will be functional

    We plan to sell the complete marking system with software, equipped with this pulsed 20W laser, for around 15 thousand Euros ...

    Viktor

  2. #22
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    ... I'm searching for different "give-aways" for the next exhibition in Juny - could be this

    Click image for larger version. 

Name:	Vitruvian Man - outline.jpg 
Views:	7 
Size:	619.9 KB 
ID:	52071


    Viktor

  3. #23
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    ... made them smaller (20mm instead of 35mm) for higher mechanical stability/stiffness and lower material effort.

    Here a video, lasering the smaller parts - https://vimeo.com/216584306


    ... and the results:

    Click image for larger version. 

Name:	Vitruvian Man - outline2b_PC.jpg 
Views:	3 
Size:	236.3 KB 
ID:	52078 Click image for larger version. 

Name:	Vitruvian Man - outline2a.jpg 
Views:	3 
Size:	136.0 KB 
ID:	52077 Click image for larger version. 

Name:	Vitruvian Man - outline2b.jpg 
Views:	4 
Size:	355.8 KB 
ID:	52076


    Viktor

  4. #24
    Join Date
    Jul 2016
    Location
    New Jersey, USA
    Posts
    22

    Default

    I realize this was an old project but what are you using for the pulsed fiber laser?
    How are you pulsing it?

  5. #25
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,814

    Default

    Quote Originally Posted by VDX View Post
    We plan to sell the complete marking system with software, equipped with this pulsed 20W laser, for around 15 thousand Euros ...
    That will compete very favorably with the units I've seen from Trotech. And based on your pictures, you've got them beat in terms of resolution.

    Adam

  6. #26
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    Quote Originally Posted by gn3481 View Post
    I realize this was an old project but what are you using for the pulsed fiber laser?
    How are you pulsing it?
    ... with the CNC-mill, I'm using to move the CW-laser-heads or older pulse-laser-head, it's the same way as with the PZT-drive pastedispensers or lasermodules - setting the "pulses per mm"-value in the software parameters and let the hardware (when synced with the X/Y-Clock-pulses) or software (calculating variable PWM for acc-/decceleration) handle the pulsing.

    With the XY-galvoscanner it's simply a frequency I'm setting in the parameters - e.g. "cutting" with 100mm/s feedrate and 2kHz pulsing ... or "engraving" with 2m/s and 50kHz pulsing ...

    Viktor

  7. #27
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    Hi Adam,

    Quote Originally Posted by buffo View Post
    That will compete very favorably with the units I've seen from Trotech. And based on your pictures, you've got them beat in terms of resolution.
    ... are you referring to the fiber-laser systems, or the CO2-lasers from Trotec?

    With the CO2-lasers they'll have much bigger spot sizes, so not really comparable to the fiber-lasers.

    My tests were made with spot sizes of roughly 40 microns (without beam-expander and with 7mm entry beam diameter), but 30 microns are common with this types of laser-markers too ...

    Viktor

  8. #28
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    ... here some samples of "micro-machining" - did tests with varying hatch-densities and repeated engraving in brass and a multi-layer ceramic part ...

    First the tests in brass - with 30microns hatch-spacing and 10x ablating it will "engrave" 0,3mm deep:

    Click image for larger version. 

Name:	Messing 1x 3x 10x.jpg 
Views:	7 
Size:	102.0 KB 
ID:	52099 Click image for larger version. 

Name:	Messing 1x 3x.jpg 
Views:	8 
Size:	542.9 KB 
ID:	52098


    ... in ceramic it's a bit more effective - same parameters and 10x engraving will remove 0,6mm:

    Click image for larger version. 

Name:	Blue Keramik - Oben.jpg 
Views:	9 
Size:	360.3 KB 
ID:	52097 Click image for larger version. 

Name:	Blue Keramik - Unten.jpg 
Views:	8 
Size:	90.8 KB 
ID:	52096

    Click image for larger version. 

Name:	Blue Keramik Vorne - 1x 2x.jpg 
Views:	7 
Size:	992.4 KB 
ID:	52095 Click image for larger version. 

Name:	Blue Keramik 1x 10x - 50-250.jpg 
Views:	8 
Size:	270.7 KB 
ID:	52094 Click image for larger version. 

Name:	Blue Keramik 1x 10x - 30-150.jpg 
Views:	7 
Size:	252.5 KB 
ID:	52100


    Viktor

  9. #29
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,814

    Default

    Quote Originally Posted by VDX View Post
    are you referring to the fiber-laser systems, or the CO2-lasers from Trotec?
    Both! My wife operates a Trotech at work that has both a CO2 and a YAG laser. Most of what they do is marking, not cutting, but even so I've seen the results and the level of detail you're getting is superior to the best I've seen from the unit she runs - even when using the YAG.

    Makes sense though. You're moving a tiny mirror with precision optical feedback. The Trotech is moving a huge, heavy (by comparison) carriage with optics, a fiber head, a fan, and so on... Plus the carriage has to move over a very large travel distance while maintaining positional accuracy. And finally, there is a limit to how precise you can get with a stepper motor and it's nowhere near the precision of a modern galvo.

    Like I said: you guys are definitely onto something here, and at that price point you can be very competitive. Hope it goes well for you!

    Adam

  10. #30
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,059

    Default

    Hi Adam,

    thanks for the thumbs-up!

    Yes, there's a big difference in resolution and positioning accuracy between belt-driven systems and galvo-scanners, but it's too related to the targeted working dimensions -- so more a compromise between marking speed and accuracy.

    But on the other hand - I'm working since maybe 30 years with different setups - my first DIY-CO2-lasercutter/engraver was driven with steel-wires and steppers too, with up to 200mm/s moving speed ... and for high accuracy I have used different gantry-style machines with steppers or servos.

    My actual gantry is a modified prototype from Isel, driven with servo-motors and encoders with a positioning accuracy of 2,5 microns, so potentially even more accurate than the galvo-scanner.

    The main difference is the positioning speed - when engraving, then max. 80mm/s reliable with the gantry, more than 5m/s with the galvos ... and the galvos can fast move to the next coordinate with up to 50m/s! (but need then some microseconds to decay/swing off).

    The main drawback with the galvos is the limited marking area - 110x100mm with my actual setup ... but could be resolved by an aditional linear XY-positioner with bigger moving range - the software can divide the marking area in "tiles" and use both positioning methodes to mark much bigger areas ...

    Viktor
    Last edited by VDX; 05-12-2017 at 00:39.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •