Metal scraping: Surface plate, will it hover?
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- Опубліковано 16 вер 2024
- If you scraped a surface quite good, the air between your master and the work will take some time to escape. The work will ride on a cushion of air trapped in the narrow gap.
You have some very good friends. That is incredibly amazing. The first few seconds watching it glide all of my senses were discombobulated. I was experiencing some type of mental G-forces. Very good work.❤❤
The 1st angle plate I ever made as a machinist(1990) did that(May still,but doubtful....:-))Cut from BIG hunk of fine grain cast iron,after machining had cryo'ed,rough ground,cryo'ed again,stress relieved,finish ground to 50mil.,and using the companies best standards to grind from.When I worked at Sunnen,we made demo parts for customers that were sleeves on a pin/stand that would "float" on an "air bearing" if you put a cork in the end,and spin for several minutes on some of the best ones.Got hurt in 2001,plates been setting in tool box ever since,but I'm getting to garage on "good days" now,even bought a surface plate and dial height gage this month,got a 'lil lathe/mill combo,no power feed or thd which sucks,but I make chips ;-)(My full size mach.'s are disconnected and in storage).Anyhow,my angle plate would do that without being scraped,but I put WAY more work grinding it that way than to just scrape it.In tech school,our Teacher was a German immigrant raised and taught "the old way",I'd stay late and he would teach me HIS way.IMHO,BETTER than a lot of our curriculum,We rebuilt a Horiz. Mill,I learned to sleeve bad bushings no longer avail,make several parts without prints,and to scrape ways.Wish I was still able to work.Anyway,having a plate float that way is neat as hell until you are trying to use it to check a part locating off it.Then it's a pain,lol.Kinda like wringing in a 12x18 Joe block,huh,lmao.VERY nice job! Imagine doing it all by hand......
Thanks for the story from those old days! I wish you all the best
Right back at 'ya,and a BIG THANK YOU for all the videos you make/share!!!
Sounds like a real cool guy, wish I had someone like that to reference. Wanting to build my own cnc mill is not going to be easy but damn well worth it I think.
That`s great. Exactly what flaking is for but instead of a air cushion it`s oil..
Nicely done
It's amazing (but makes sense) that something so big can 'float' on a layer of air
The surface plate is a grade 0 (certified, not Chinese, with a back-tracable protocol).
That plate was a test how far I could get. I did not use Dykem blue (the best I think) and I really got problems to see the spots. Also, I had the hovering effect while spotting. Didn't help that much.
It had something like 30 PPSI (points per square inch). But since then, I used it and it might have changed. Yes, I spent quite some time on that one.
Maybe I'll make a "scraping for high PPSI" video...
Holy crap dude! Nicely-done!
Air Bearing...it's the same principal that makes correctly scraped surfaces effective bearing surfaces, they trap a layer of lubricant between the sliding surfaces.
That's pretty damn awesome!
you must be joking!!! coolest thing ever!
Wow!
Looks like you need to check the level of your surface plate ;)
Good work!
We demand more videos
...please
Do you know flat are those surfaces? I have done some optical flats. In those final work starts when surfaces are flat in one thousandth of a millimeter. Goal is to get surfaces flat within 50 nanometers, or better, of course.
Using dye and scraper sounds primitive, but results are accurate. Of course you must have reference surface. Good work.
Now that's a flat surface!
Nice job!!!
A couple of questions, what grade is your granite surface plate? Your scraping videos are fantastic, I was wondering what your finished surface looks like with the bluing especially on this particular plate. It looks like you spend much more time scraping all the indicated high spots where others say scraping 80% of the blue area is all that's required, comment? Thanks for showing your setup and tools as well.
I have seen that effect before, but never with anything that heavy!
its falling towards the largest and nearest mass
No it's falling because the plate must have a slight angle. Variation in gravity is not enough to produce such a large acceleration.
Very good, just the opsite effect of gauge blocks when stuck together... :o]
O,,,
yes please:)
Please do! :)
Witchcraft!
Haha! Funny.