Beware: non-stabilized HeNes will drift and can put a pretty significant error into your positional feedback over longer periods of time(many minutes of machining). I recommend that you at a minimum stabilize its temperature(heater band, thermistor), or go all the way and make a heterodyne interferometer. Sam's Laser FAQ has an excellent guide on a DIY ultra low cost solution. He also has a guide on how to make a basic digital fringe counting Michelson interferometer. And he sells full kits(and will probably sell you a partial one) as siliconsam on eBay, if you want a shortcut.
I am well aware of these considerations. The final design has a thermal regulation system integral to it. I also already have all the components for the quadrature receiver from Sam assembled and ready to be integrated as well. Not going to go the heterodyne route just yet, but I’m looking into phase shift sensing for Michelson interferometers using an actuated reference mirror, which gives resolutions an order of magnitude better than a standard setup
@@cylosgarage In practice a DIY heterodyne build will give you about an OOM in final precision as well. It's good that you're aware of what can be done, looking forward to seeing it :)
@@cylosgarage Much easier to use a stabilised two frequency laser like Agilent, Zygo and Excel do. HP, Zygo and Excel make plane mirror interferometers for distance measuring interferometry (DMI), Used optical components from these are readily available. The hardest part is probably the electronics required if you design your own. there is extensive literature on DMI and the various interferometers used and why two frequency lasers are the best solution.
U can't not get sub wave length measurement via this kind of interferometer setup,u need Heterodyne interferometer. A second hand renishaw encoder can use save u a lot of trouble
You can interpolate the signal from this and get way better resolution than the wavelength. That’s what I’m working on right now. I’m waiting for a nice deal on a renishaw to pop up on eBay
@@cylosgarageAs far as I know those are called sinusoidal encoder ,all commercial products are consit of 2 parts read header(scanner ) and interpolator(interface),read header send 2 +/- 1v vpp signal 90 degress in phase difference.Tradition scan technique allow siganl period of 20um,blow that physical scale only heidenhain lif and lip series allow 1-8um raw siganl period(via different scan technique)
You should buy a digital readout if you dont understand how to use the dials the lathe manufacturers have provided. For higher precision use with an indicator on a magnetic base. Look it up! Surely someone has done a TH-cam video on this method. You're obviously a beginner/enthusiast because every professionally trained craftsman/tradesman would laugh at this as a good idea. Good luck.
This stuff changes the way I view the world.
This is my favorite comment I’ve ever gotten
This project is getting cooler and cooler! Great work!
That’s amazingly stable. I’m surprised it wasn’t drifting all over the place with air currents, considering how sensitive it is
Beware: non-stabilized HeNes will drift and can put a pretty significant error into your positional feedback over longer periods of time(many minutes of machining).
I recommend that you at a minimum stabilize its temperature(heater band, thermistor), or go all the way and make a heterodyne interferometer. Sam's Laser FAQ has an excellent guide on a DIY ultra low cost solution. He also has a guide on how to make a basic digital fringe counting Michelson interferometer.
And he sells full kits(and will probably sell you a partial one) as siliconsam on eBay, if you want a shortcut.
I am well aware of these considerations. The final design has a thermal regulation system integral to it. I also already have all the components for the quadrature receiver from Sam assembled and ready to be integrated as well. Not going to go the heterodyne route just yet, but I’m looking into phase shift sensing for Michelson interferometers using an actuated reference mirror, which gives resolutions an order of magnitude better than a standard setup
@@cylosgarage In practice a DIY heterodyne build will give you about an OOM in final precision as well. It's good that you're aware of what can be done, looking forward to seeing it :)
@@cylosgarage Much easier to use a stabilised two frequency laser like Agilent, Zygo and Excel do. HP, Zygo and Excel make plane mirror interferometers for distance measuring interferometry (DMI), Used optical components from these are readily available. The hardest part is probably the electronics required if you design your own. there is extensive literature on DMI and the various interferometers used and why two frequency lasers are the best solution.
did you ditch those angular encoders? why?
Have you considered using a protractor?
What are you planning to use for the bed of the lathe? Granite surface plate?
Damn that thing is SO sensitive 👍😄
Crazy stuff
Bro how can I get in contact with you , interferometry questions
Cyruslloyd4@gmail.com
should be adequate for your lathe ;)
Are you making a L*.O.D.T.M. at home?
Well, it’s not going to be Large, and definitely not as good, but yea I’m certainly trying
U can't not get sub wave length measurement via this kind of interferometer setup,u need Heterodyne interferometer.
A second hand renishaw encoder can use save u a lot of trouble
You can interpolate the signal from this and get way better resolution than the wavelength. That’s what I’m working on right now. I’m waiting for a nice deal on a renishaw to pop up on eBay
@@cylosgarageAs far as I know those are called sinusoidal encoder ,all commercial products are consit of 2 parts read header(scanner ) and interpolator(interface),read header send 2 +/- 1v vpp signal 90 degress in phase difference.Tradition scan technique allow siganl period of 20um,blow that physical scale only heidenhain lif and lip series allow 1-8um raw siganl period(via different scan technique)
You should buy a digital readout if you dont understand how to use the dials the lathe manufacturers have provided.
For higher precision use with an indicator on a magnetic base. Look it up! Surely someone has done a TH-cam video on this method.
You're obviously a beginner/enthusiast because every professionally trained craftsman/tradesman would laugh at this as a good idea.
Good luck.
Sounds like someone is jealous of my nanometers 😘😘😘
What indicator do you recommend for nanometer precision?
@@kylewarren69mahr nanomess
@@kylewarren69 Starrett last word brother they’re da best gosh dang indicator ever made I got a great deal on mine only paid 387 dollars for ‘er
A plunger type indicator where you use the light that is reflected off the graduated dial.
Lol