Author Topic: SiXYLaser  (Read 20424 times)

Pawpawpaw85

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Re: SiXYLaser
« Reply #240 on: May 13, 2017, 01:02:09 AM »
How powerful is your laser? What wattage?

It's the 2W TTL laser sold on banggood. I used to use the 2.5W but found it has a "startup" time of ~1sek each time it powered on so cutting performance was very poor after each travel.
Havnt fully tested this one but it seems to power on full right away which gives better performance even if lower powered.


Next step for the SiXYLaser, see if able to implement end stops to work well with the controller board, and figure out best placement of the endstops.
« Last Edit: May 13, 2017, 01:04:45 AM by Pawpawpaw85 »

mrehmus

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Re: SiXYLaser
« Reply #241 on: May 13, 2017, 11:10:14 PM »
If you are running GRBL 1.1e, the delay is built in. Ralph's mod toe 1.1e settings will get rid of the delay.
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Zax

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Re: SiXYLaser
« Reply #242 on: May 14, 2017, 04:54:20 AM »
If you are running GRBL 1.1e, the delay is built in. Ralph's mod toe 1.1e settings will get rid of the delay.

I think you are confused  ???

mrehmus

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Re: SiXYLaser
« Reply #243 on: June 09, 2017, 07:12:18 PM »
Normal state.
mrehmus
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Pawpawpaw85

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Re: SiXYLaser
« Reply #244 on: June 13, 2017, 09:28:49 PM »
Hello Ralph.
Shouldnt the thread be moved to "Custom Size Frames", since the gantry can be of any size the user wishes just by changing rod and belt length?

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Re: SiXYLaser
« Reply #245 on: June 13, 2017, 09:37:54 PM »
Will do...!!!
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Pawpawpaw85

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Re: SiXYLaser
« Reply #246 on: June 14, 2017, 02:14:09 PM »
Thanks Ralph. Hope to get time now during summer to finalize the first "final" iteration of SiXYLaser :)

mrehmus

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Re: SigaLaser
« Reply #247 on: August 02, 2017, 08:55:41 PM »
Attached is a possible starting point. Open with generic OpenScad to see the source and play with a 3d parametric design tool.

The problem, if there is one with that design is that the laser head is cantilevered off the bar. For additional stability, it should be hung between two parallel bars. Of course, that reduces the motion in one direction by the width of the bars. The drive for the carriage can then be placed in its center which gives it a stability in that area as well.

Furthermore, the plastic bits do distort and should be replaced with aluminum or carbon fiber. Binding a carbon fiber rod to the sides of the aluminum extrusions would also stiffen them.
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ThothLoki

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Re: SiXYLaser
« Reply #248 on: October 05, 2017, 06:15:55 AM »
Hey Pawpaw, how is it going? Any update on your machine? I am starting to look at a corexy system for myself and would love some input. Love your design!
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ggallant571

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Re: SiXYLaser
« Reply #249 on: October 09, 2017, 12:31:06 AM »
I have assembled a corexy machine using 500mm 8020 rails and 3d printed mounting fixtures. Currently controlling motion with Arduino and CNC shield. Built GRBL firmware 1.1f. It sort of works. Some problems:

1. Excessive vibration. Really loud. Slow is worse
2. Math to convert rotations to distance is funky. $100 & $ 101 are set at 5 to get anything close.
3. Not sure speed is accurate.

The acceleration is set at 2000.
The two A4988 driver boards are set at 0.43 Volts
The X & Y carriages ride on 8mm rod with linear bearings. Smooth & easy glide when belts are off.
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ThothLoki

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Re: SiXYLaser
« Reply #250 on: October 09, 2017, 04:36:24 AM »
Thanks.
Laser: A5 2000mw with L7 Board / A3 2500mw PWM with Mana SE -- All using T2Laser
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ggallant571

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Re: SiXYLaser
« Reply #251 on: October 09, 2017, 02:34:45 PM »
I think my skills at mechanical engineering are poor to none. Suspect that I have made a resonator instead of a corexy laser etcher. First and foremost, my platform is not very rigid. Second I used 8 mm round stock to support the X and Y carriages. Third, my dimensions are 500 mm x 500 mm. Fourth it is sitting on a MDF panel.

The stepper motors naturally create small vibrations when running. This is transferred to the belts and from there to the carriages and then to the rails.

Physics 101 - 500mm is approximately 700hz.

Get it all resonating in sync and the noise just grows. The MDF panel does a great job of amplifying the noise. BTW, changing the speed from 300 mm/min to 2400 mm/min results in a dramatic decrease.

The X carriage rails are so "unrigid" that the tugs by the belts cause severe twisting. The Y carriages actually differ by more than 1 cm when changing direction.

Think I will keep this one around just to annoy the wife. The noise travels nicely throughout the house.

Rev 2 will focus on getting the gantry and X carriage more solid.
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Re: SiXYLaser
« Reply #252 on: October 09, 2017, 05:27:28 PM »
There are cork and rubber stepper mounts that reduce vibration. Those would help some. I have a set of cork here that I keep forgetting to install in my 3D printer. The metal/rubber/metal ones look like a better solution but are more expensive.

If you haven't yet, install some rubber feet under you MDF. I would say about 12 of them. That will help reduce sound and vibration also. It really help on my mill that is mounted on a 1 1/4" wooden base.

https://www.amazon.com/Rubber-Stepper-Vibration-Damper-Screws/dp/B07415B39B/ref=sr_1_1?ie=UTF8&qid=1507594601&sr=8-1&keywords=stepper+motor+vibration

http://www.ebay.com/itm/10pcs-Nema-17-Cork-Gasket-Damper-42-Stepper-Motor-Dampers-Isolator-f-3D-Printer/252806165838?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D46673%26meid%3D8d136d0cc2fa4f36a9fe2bb80fd4ea49%26pid%3D100508%26rk%3D1%26rkt%3D1%26&_trksid=p2045573.c100508.m3226
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ggallant571

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Re: SiXYLaser
« Reply #253 on: October 09, 2017, 05:45:19 PM »
Thanks for the suggestion. I think the noise is the result of a poor design.

After a little digging I found that the typical laser etcher uses a 16 microstep. Explains why my steps per mm is 5. Suspect that when I wire that option it will be smoother (quieter).
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ggallant571

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Re: SiXYLaser
« Reply #254 on: October 09, 2017, 08:40:37 PM »
Stiffened the frames a bit, tensioned the belts, & enable the 16X minrostep on the A4988. World of difference. Now smooth and quiet. Time to mount the laser.
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