MechMate CNC Router Forum

Go Back   MechMate CNC Router Forum > General - MM Build
Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Reply
 
Thread Tools
  #1  
Old Fri 18 January 2013, 00:20
Regnar
Just call me: Russell #69
 
Mobile, Alabama
United States of America
Questions about laser crosshair.

Dmoore, I was looking for your build thread but couldnt find it. I was wondering about your laser crosshairs.

How did you power them?
How well did they hold up under the router?
Is the dust bad on them( ie. effect their performance)

The only think different I was thinking about doing is mounting them to they Y car instead of the Z axis. What do you think. Thanks for the input.

Here is a photo for others to see what I am talking about. By the way the lasers only cost 3.90 a piece with free shipping here. http://dx.com/p/red-laser-module-foc...-16mm-5mw-5928


Last edited by Regnar; Fri 18 January 2013 at 00:23..
Reply With Quote
  #2  
Old Fri 18 January 2013, 01:53
KenC
Just call me: Ken
 
Klang
Malaysia
I use a laser cross-hair, with a different arrangement. I got lazy & just wire it to a 9V battery via a on/off switch. both double-sided taped to the car.
Reply With Quote
  #3  
Old Fri 18 January 2013, 07:36
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Dmoore was banned - his thread
Reply With Quote
  #4  
Old Fri 18 January 2013, 08:53
Regnar
Just call me: Russell #69
 
Mobile, Alabama
United States of America
Ken would you do it again?

Gerald I knew the name sounded fimiliar. His user name is the same on the Dx website where I was able to get the photo from. Photo description was Cnc Router Mechmate.
Reply With Quote
  #5  
Old Fri 18 January 2013, 12:48
MetalHead
Just call me: Mike
 
Columbiana AL
United States of America
What about this one?

http://dx.com/p/red-laser-module-foc...-16mm-5mw-5942
Reply With Quote
  #6  
Old Fri 18 January 2013, 13:42
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
In the photo at the top of this thread, there are two separate line lasers.

A single crosshair laser, mounted to the side of the spindle, will not make a steady crosshair directly under the spindle axis, because differences in the z-height will project a moving crosshair.
Reply With Quote
  #7  
Old Fri 18 January 2013, 15:41
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
If you would like to use one 'x' laser only, you can position it in the y-car and use your tool offsets in Mach to always reference that offset. This allowed be to bolt a little block of Delrin just under the Spring Hold down bracket for the z-motor and wire directly into the button station on the y-car. Power for the laser was provided by the 5v tap on my Antek power supply which was a 500va 56v 5v and 12v additional tap unit.
The laser + the auto zero function makes for a very easy to use machine.
...i'm looking for a picture now

Looks something like the post here:
http://www.mechmate.com/forums/showt...hair#post42311
But mine was hidden under car.

Last edited by smreish; Fri 18 January 2013 at 15:46..
Reply With Quote
  #8  
Old Fri 18 January 2013, 18:22
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
By all means mount it at a fixed height , cross hair or line laser does not matter. Because if you mount it to Z axis it will loose focus as you go up or down

learned the hard way...
Reply With Quote
  #9  
Old Sun 20 January 2013, 20:11
Regnar
Just call me: Russell #69
 
Mobile, Alabama
United States of America
Ok guys well I bought both types it only sent me back 12 dollars. My goal is to make it useful and not have it look "home" made. I know it doesnt really matter but my Dust Foot looks home made and it erks me evertime I look at it.
Reply With Quote
  #10  
Old Sun 20 January 2013, 22:28
KenC
Just call me: Ken
 
Klang
Malaysia
Quote:
Originally Posted by Regnar View Post
My goal is to make it useful and not have it look "home" made....
Its a matter of preference.... You can also spend another 12 dollars to house the battery in a professional looking casing, an expensive looking on/off button & classy looking laser holding brackets...

BTW, your dust shoe doesn't look home made to my eye.
Reply With Quote
  #11  
Old Mon 21 January 2013, 05:01
sailfl
Just call me: Nils #12
 
Winter Park, FL
United States of America
Russell

I am not sure why you needed two lasers. I only used one and it worked fine. Also if you painted your dust foot it would look less home made. You whole machine looks professional.

Others

With regards to out of focus. I adjusted the focus so that it was fine at most heights that I use. I have stopped using but I think once I get the spindle finished I will add it back and start using it. I have a laser like Russell has. I power mine from the machine and turn it on with mist control and a button on my Contour ShuttelPro 2.
Reply With Quote
  #12  
Old Mon 21 January 2013, 08:19
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
two lasers if you use line lasers so they can create a cross, but the single crosshair is easier if you have a dust foot as its offset
Reply With Quote
  #13  
Old Mon 21 January 2013, 09:56
Regnar
Just call me: Russell #69
 
Mobile, Alabama
United States of America
Ken, thanks for the kind words. I have all the material to make it look better just havent as it works and just dont have the time right now.

Nils, The reason for the two lasers is you dont have to use offsets to get the Zero location. Just move the spindle over the top of the work and go. As of last night though I was able to create a button to Zero the X and Y Axis in LinuxCNC. I not a Mach user but slowly thinking it might be time to pick up Windows XP.
Reply With Quote
  #14  
Old Mon 21 January 2013, 17:25
sailfl
Just call me: Nils #12
 
Winter Park, FL
United States of America
Russell,

Thanks for your reasoning for two lasers.
Reply With Quote
  #15  
Old Tue 22 January 2013, 03:31
KenC
Just call me: Ken
 
Klang
Malaysia
Russel,
I also didn't have much time when I jury jig the laser diode for proof of concept; and some how it stay as it is now
My philosophy is it's greener to the world to put the device to good use as soon as possible... BTW, I'm use to the ugly set up after a few while

With my offset Laser diode, I zero my table X-Y position before I power up the stepper motors; I can now say certainly that the limit switches are redundant in my set up...

LinuxCNC (A.K.A EMC2) is more fun than Mach3. No doubt Mach3 has more bells & whistle in it & much easier for 1st timers in setting up, but I'm tempting to revert my plasma table to LinuxCNC once I'm familiar with all the do's & don't of plasma table operation... still climbing the learning curve.

Last edited by KenC; Tue 22 January 2013 at 03:34..
Reply With Quote
  #16  
Old Wed 23 January 2013, 04:08
Surfcnc
Just call me: Ross #74
 
Queensland
Australia
Russell

How about just using a green dot laser.
A dot jogged along an axis "is" a line and aligning a corner to a single point is also pretty simple.
I personally am a bit over the red line lasers after staring at one for days on end doing machine alignments on a surfboard shaping machine.
I find the reflected red light very annoying, which I feel translates into damage to the eye over the long term.
Green light is more visible to the human eye so you actually don't need as much power to see the point and you see it more easily giving a lower exposure time.

The cheaper line lasers have a rather wobbly focus ring.
If you do use one, focus it up, then superglue the thing as the line will move heaps just from that slop in the focus ring.

cheers
Ross
Reply With Quote
Reply

Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Laser scanning using a distance-sensing laser normand blais 50. Toolheads 49 Tue 04 November 2014 12:32
Pre purchase questions and hello bobhome Introduce yourself and start planning 1 Mon 19 November 2012 11:16
New Member has Questions hevertg Introduce yourself and start planning 22 Sat 09 June 2012 17:43
M2-M6 Drawing Questions Tom Ayres General - MM Build 2 Thu 31 May 2012 18:11
New Member with Questions BSims66173 Introduce yourself and start planning 2 Thu 03 November 2011 12:51


All times are GMT -6. The time now is 14:37.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.