Amazing job! I admire everything - both the carriage with air bearings and the precision installation of the X-axis with just magnets.. and the general concept and execution of all the details!.. But I understand something about diffraction gratings.. For reflective gratings, the shape of the grooves is not chosen randomly! In the cross section, the grooves should have the shape of inclined saw teeth. That's it: /|/|/|/|/. One side is inclined, the other is vertical. The slope is chosen in such a way that, when light falls on the grating normally, the angle of reflection from these surfaces coincides with the angle of the first diffraction maximum of the grating. In this case, 92 to 98% of the incident light goes in this direction. In the lattice obtained by the author, the proportion of light forming the spectrum does not exceed 25%. It is clearly visible. The spectra are quite pale, although the number of strokes is very large! To improve the quality of the resulting gratings, you must first select the spatial frequency of the strokes, then calculate the angle of the first diffraction maximum, and then calculate the angle of inclination of the strokes. And already knowing this parameter, sharpen the ruby at the right angle. Then the diffraction gratings will be as great as the machine that makes them.
Very cool! Lots of interesting kinematic and mechanical solutions! Do you think you might add an additional axis for more complex gratings in the future?
To my knowledge maglev stages require fast electronic Control loops and a very good position feedback mechanism. In an air bearing this is all 'done by fluid dynamics'.
Yes! This would greatly increase the precision of that part of the system, and as long as the other components connected to it have a similar level of precision of movement, then that would definitely let higher resolution scribing be possible.
How did you make sure you were always applying the correct pressure with the ruby on the material you were grooving? Did you aim for a specific depth for the grooves?
The force can be adjusted using the spring steel wire and it is quite repeatable. The groove depth should then be chosen to have no gaps between adjacent grooves.
how are you managing to step the stage by 10um increments? the stepper motor, belt, and pulley combo looks like it could do 100um. are you using an encoder and microstepping?
The stage is only steps along the y direction by 10µm where the precision micrometer screw with a pitch of 0.6mm is mounted. The belt drive is much mor inaccurate, but htats okay for this application.
Get some DCM (Dichloromethane) it is the best thing ever for 3D Printing! You don't glue parts together you chemically weld them. Much stronger and very fast setting. DMC is like acetone on steroids (also it's volatility) but doesn't stink as much as acetone and is much more powerful. Still like with all solvents work in a well ventilated area. But it's so awesome and can make printing parts in multiple pieces very easy. Try it it is awesome (for pla at least but others work as well). But don't dip your brush into the bottle or you will contaminate your DCM with pla VERY fast. I use a shotglas and fill it with a couple ml of DCM.
![A build guide for DIY Air-Bearing Pads [4K]](http://i.ytimg.com/vi/XmUgO-BsIdA/mqdefault.jpg)
![A build guide for DIY Air-Bearing Pads [4K]](/img/tr.png)
![Building a Small and Quiet Air Compressor [4K]](http://i.ytimg.com/vi/aUEZkS5FLxU/mqdefault.jpg)
Super impressive results! A lot of really clever design features on the machine, congrats on getting it all assembled and working!
Thanks a lot. Always enjoy your videos as well. Some major improvements to the machine are planned in near future too, so feel free to stay around :)
Extremely rare outstanding quality content absolute beyond the average! Thank you for sharing.
Awesome work! Really love many of the design decisions and concepts used here!
Amazing job! I admire everything - both the carriage with air bearings and the precision installation of the X-axis with just magnets.. and the general concept and execution of all the details!.. But I understand something about diffraction gratings.. For reflective gratings, the shape of the grooves is not chosen randomly! In the cross section, the grooves should have the shape of inclined saw teeth. That's it: /|/|/|/|/. One side is inclined, the other is vertical. The slope is chosen in such a way that, when light falls on the grating normally, the angle of reflection from these surfaces coincides with the angle of the first diffraction maximum of the grating. In this case, 92 to 98% of the incident light goes in this direction. In the lattice obtained by the author, the proportion of light forming the spectrum does not exceed 25%. It is clearly visible. The spectra are quite pale, although the number of strokes is very large! To improve the quality of the resulting gratings, you must first select the spatial frequency of the strokes, then calculate the angle of the first diffraction maximum, and then calculate the angle of inclination of the strokes. And already knowing this parameter, sharpen the ruby at the right angle. Then the diffraction gratings will be as great as the machine that makes them.
happy to find you. thanks a lot for sharing.
this is wild! , cost effective insane precision. i love this!
Excellent work here! I have read about the early ruling engines used for making gratings, but it is not something I've actually seen done.
Insane! I love your attention to Details, very impressive work 😊
what do u intend to use this diffraction gratings for? Optical encoder reading strip?
Very cool! Lots of interesting kinematic and mechanical solutions! Do you think you might add an additional axis for more complex gratings in the future?
Impressive work! Appart from cost/manufacturability, is there an advantage of using an air bearings stage instead of a magnetic levitation stage?
To my knowledge maglev stages require fast electronic Control loops and a very good position feedback mechanism. In an air bearing this is all 'done by fluid dynamics'.
Could you use a long differential screw to get higer precision to have greater density of lines
Can you use the same tool for higher density??
Yes! This would greatly increase the precision of that part of the system, and as long as the other components connected to it have a similar level of precision of movement, then that would definitely let higher resolution scribing be possible.
What are you aligning to at 9:30? It looked like you just eyeballed 90 degrees?
Beautiful works.
Genius ! ❤🎉
SuperPowerful respect for your work and willpower!
Cool machine
Excellent
How did you make sure you were always applying the correct pressure with the ruby on the material you were grooving? Did you aim for a specific depth for the grooves?
The force can be adjusted using the spring steel wire and it is quite repeatable. The groove depth should then be chosen to have no gaps between adjacent grooves.
This is so cool 🤓
Such a awesome result! ❤
I hope your rope never snaps 😥
But man, now you should be grate-ful 😂🤣
how are you managing to step the stage by 10um increments? the stepper motor, belt, and pulley combo looks like it could do 100um. are you using an encoder and microstepping?
The stage is only steps along the y direction by 10µm where the precision micrometer screw with a pitch of 0.6mm is mounted. The belt drive is much mor inaccurate, but htats okay for this application.
@DiffractionLimited you're right. i hadn't watched the whole video
nice work!
Get some DCM (Dichloromethane) it is the best thing ever for 3D Printing! You don't glue parts together you chemically weld them. Much stronger and very fast setting. DMC is like acetone on steroids (also it's volatility) but doesn't stink as much as acetone and is much more powerful. Still like with all solvents work in a well ventilated area.
But it's so awesome and can make printing parts in multiple pieces very easy.
Try it it is awesome (for pla at least but others work as well). But don't dip your brush into the bottle or you will contaminate your DCM with pla VERY fast. I use a shotglas and fill it with a couple ml of DCM.
classy
What's that font?
the servo looks a little bit over kill :D
but i bet it keeps in line with the level of precision of movement and tolerances as the rest of the mechanical movement features.
Tremendous stuff mate. Shoot me an email sometime I’d love to talk more
Thank you very much :)