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Very clear explanation. Thank you

Thankyou kindly for this video. I started looking for information after watching Dan's video episode 17 I think. I appreciate the work you had to put into this.

Great info, not seeing the pdf link though? I'll be lapping granite for the first time in a few days, working on a CI lap now...do I have to use a 3 plate method to flatten the lap, or can I just scrape it against my master? then how do I check is for wear against my master after its has diamond embedded in it(i dont wanna lap may master)?

Thank you for sharing knowledge!

6:11 What is your surface plate made of, granite? Would it make sense to use a green laser beam as a light source? 12:39 - I'm interested on how you are able to know if that cast iron bar really have a straight edge...

Fyi: there are now 21 bit encoders with either a 18 or 35 mm encoder disk for less than $100

Seriously turn the radio off other than that it's a good video

I have just found your great videos, thanks , as of 28 may 2020 your link to the REVERSAL TECHNIQUE did not work for me but fortunately using your link as a starting point I found it at this link www.abcm.org.br/symposium-series/SSM_Vol1/Section_III_Machine_Design_and_CAD/SSM_III_06.pdf

Fantastic video. Do you have a link for the PDF you used to describe the collimator ?

Can you explain what the cross lines on the green screen mean?

Indeed very well done. The speed and length are fine. What would be nice is to work out an example to measure a straight edge to see calculate it straighteners or error. This method could be a more achievable method than the optical measurement you showed in another video

Great video and nice Scraping. I took Richards class at gear works last year. Autocollimators are really interesting i hope to get to the telescope making class you mentioned as well. Great to see other scrapers in the north east

Please use a script. Start with the subject matter. Add the byline story fill AFTER.

Very well done. Thank you for sharing with us..

Great video!

Please consider this as constructive criticism.. I enjoyed the video very much the music at the end was very distracting.

sorry for being that guy, but how did you determine your support points? you don't have a uniform cross section, so you can't use the usual ratio, you'd have to use complicated maths to find them.

Hey Wayne. Great Video. I just purchased a Brunson Keuffel and Esser optical autocollimator and associated mirrors, essentially for exactly the same reasons that you have sited. I am a basement shop guy, and quite simply, I find this topic SO interesting. My questions range from reading the autocollimator to reading the Mahr Supramess .000002 indicator on the flatness indicator. Questions that I am certain you have had to research thoroughly. Do you have an email or would you be willing to give me your contact information so I could contact you directly with questions (I have a number of them). Thank you again for the video(s). Derek.

Nice video! Can't wait too see part 2! Very interesting.

I think you covered that pretty well. All the best mat

Wayne, put a link to the weatherman in the description please

I learned 3 plate in school.

Wayne good to see you back in action and alive. We were talking about you the other day. I like the observatory, with that roll off roof you could easily use my service crane & drop a machine tool in there when the garage gets full...Heh Heh. We should try to get together soon. Cheers Mate👍

Hi Wayne, Thanks for posting. I think that this is a field of Metrology that more and more hands on Engineers will need to become familiar with, in light of increasing precision of machinery and methods. I would like to take the liberty to explain the maths for those who want it. I mean no disrespect in doing this but there may be those who want to know. Those who can do the math can just skip this comment. Eq1: I(one) = A-B Eq2: I(two) = A+B The important thing to consider here is that these two equations are true AT THE SAME TIME [which that would not be had you changed to different equipment half way through]. This means that we can use simultaneous equations to find our answers. First; solving for A, we remove the B's by adding the two equations. I(one) = A-B PLUS I(two) = A+B I(one)+I(two) = A-B+A+B [and since the -B and +B cancel out to get] I(one)+I(two) = 2A [dividing by 2 to get] A={I(one)+I(two)}/2 - your result. Second; solving for B, we remove the A's by subtracting the two equations. I(one) = A-B MINUS I(two) = A+B I(one)-I(two) = A-B-(A+B) [and expanding the bracket to get] I(one)-I(two) = A-B-A-B [and since the - A and +A cancel out to get] I(one)-I(two) = -2B [dividing by 2 to get] -B={I(one)-I(two)}/2 [Now we multiply by -1 to get] B=-1*{I(one)-I(two)}/2 [multiplying out the top bracket to get] B={-I(one)+I(two)}/2 [putting it in conventional order to get] B={I(two)-I(one)}/2 - your result I hope this helps someone just starting into the field. I am sure there are many hands on Engineers out there who can calculate the number of turns of a dividing head handle for a given degree without batting an eyelid - but they may have for gotten this maths. There are many fine vids on here formalising the solution of simultaneous equations. Good luck, look forward to the next vid. Seth

No ones going to argue that your SE is off after all the inspections. Thanks for sharing your findings with the reversals. Always nice when different methods of measuring give a similar result. All the best Mat

Thank you for this, I'm in the process of rescaling a selection of 6ft came backs without access to a master to scrape to. I was wondering if an autocollimeter would help. Now I know it will once I get my head around the maths. Great video , hope you got your shaper rebuilt to a satisfactory level. I did mine last year, so this year's project is a tool room lathe. Target is 0.0001/10" alignment. Should be a challenge. All the best Mat

Hey ! Nice work :) What happened with that project? Did you manage to complete it ?

Wayne, your thoughts please. Why hand scrape instead of lapping. Your using a autocolllimator to check a hand scraped surface but reference surfaces (granite) are lapped. Is it for lubrication to fill the low spots

Great video, thanks for the explanation. What make model is your autocollimator? What do I need to look for when searching for a autocollimator of my own?

Wayne, Nice update, I will look forward to more.

thanks for keeping your progression.

neat, thanks. now on to your second video

Wayne: Yes this math that you applied we do that in our heads when we adjust a 4 jaw chuck or centre up on a hole. there may be other examples. the math is good especially to write software. i down loaded the paper but have not yet done my home-work. Laugh out Loud. Thanks again. ron

Hi Wayne: i too like Dan Gilbart series. I thank you for pointing to that paper i may get something out of that. Good content on your videos. and please no disrespect but your pencil does not show up too will (hard to read on this end, but i git the idea) and i would think it would be totally up to you on how you want to present your videos. We can't all be like This Old Tony. at least you are posting videos, keep up the good work. Thanks, ron

@ 24:00 you should be taking tangent of the angle, not sin of the angle.

Wayne: it is nice to see you again, i think that you also must have many things going on , based on your time between videos. (smile) i like your set-up with the camera looking threw the instrument. seems vary convenient. hope you don't mind if i copy you on that. Thanks, ron

Wayne: Thanks for posting this. I've recently become interested in autocollimators and purchased one on Ebay. More for the interest in the science and playing in my home shop than a real need. Found your video outstanding. Nice explanation.

Hi Wayne, I appreciate the time and effort you invest in making your video's. I really liked your video on the autocollimator (and going by the number of views I am not the only one). I hope you will find the time to continue on that video series. Peter

Thanks!

Awsome! Loved it. I always wondered how a surface plate was checked to the millionth place. Now i know. keep it coming! Best Matt

Hi Wayne, it would be nice to see more videos on autocollimators

Wayne thanks for the up-date. nice videos and nice toys you have. keep up the good work.. Thanks , ron

Thanks for the great video Wayne. I always wondered how they worked. I had a fair idea but good to see it being used.

im having a similar issue with the layers being offset. have you found a good solution for this?

Wayne: after thinking about it, and you may have probably already done this,is to check your rock down that line, then rotate the straight edge 90 degrease and run the mirror on top of the straight edge. Then place the straight edge on the "Airy points" and run the mirror on top again. then think about the results. good luck i will be watching. Thanks, ron

Wayne: thanks for sharing i ran across your video because i too am rebuilding a machine and was thinking of dusting off my autocollimator.

thank you...I love Lisa

Easy to deduce that no meals were missed in the making of this video.

Is there a funeral in town? What's with the music?

damn.. we need such weather here in amsterdam !, nice video :)