Excellent engineering content, love it. On the practical side, and as a hobby machinist, I am curious as to how you machined that shoulder bolt hole with one side straight? Good to see you have winter in Austria, up here in Norway, supposedly the cold north, we have had continuous rain until end of December. Now we have a few mm of snow.
2 - Key data points to picked up here - scraping is about a 2um process - ( I suppose one can think of 1um?) - compare to surface grinding that can also approach 2um in the right hands or a lapped gauge block that has to be about 100nm to wring properly. The other bit about feeling the high spots - is also an important point. Have you done anymore steel scraping? I consider the tooling, with what I would call 'heel-control' that you used on your video 'Hand scraping Carbon Steel" to be an absolute gem. Quite interested in what you achieved with it. Thanks for letting us look over your shoulder - quite a treat..
Alex, I know it has been two years, but, does a level's bubble change size due to atmosphere? is the bubble the same at sea level and at the top Mt Everest?
Good question. Usually the levels are enclosed glass housings that do not deform notably due to atmospheric pressure. In other words, the inside of the spirit level shouldn't see the atmospheric pressure.
Could you speculate as to whether the tooth pitch of the rack and the latch are equal? A deliberate mismatch may have been employed to ensure positive location. Plausible?
If I was reading your chart correctly, it appears that it's much more (relatively) accurate at 0 and 45 degrees - with a higher error rate within the middle of the range. Did I read that correctly - and if so do you have any theories on why it is?
Great video as always, Alex, thanks. Id also add that such intstruments are an absolute pleasure to use: im lucky enough to have a hilger and watts clinometer (bubble and worm drive based) and its just beautiful to use and look at at, like they dont make anymore! Now, back to resisting the urge to buy an arc second theodolite......
The purpose of the bubble might be to more easily permit obtaining a good-ish reading when the ground is rocking due to your colleagues' firing or incoming counter-battery fire. If the bubble's vibrating more or less around the middle, you're on target.
@@anengineersfindings It was pretty unpleasant (like being on a boat for 20s), but no major damage where we live, around 40km from the epicentre. Thanks for asking.
@@anengineersfindings I had to go back and find this comment when I saw this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FE9vf2ZViUg.html Amazing!!!
Alex, Thank you for mentioning that you can _feel_ the 2-micron high spots when finish scraping the flat with a sharp scraper blade. I don't recall _any_ other RU-vid provider mentioning this, perhaps because they tend to ignore hand-scraping and use their Biax power scrapers. Now, assuming that I obtain the ability to grind my scrapers as I learn to hand-scrape, I'll know to expect to _feel_ the high spots as I perform finish scraping. Can you recommend any "less inexpensive" way to grind scraper blades than having access to a D-Bit grinder? This is a fascinating video. I truly wish that I (as an ME) had been able to design precision devices and learn much more about Metrology before I retired. I did get a chance to sit in on the OEM training when our Tool Shop received its first Kern theodolite back in the '80s and learned a bit about the devide's capabilities. We tended to use our theodolites to build, measure, & "(re)calibrate" fixturing for aircraft repair.
Hello Mr. Vines, thank you for your interesting comment. Regarding the blade sharpening: Robin Renzetti showed a very simple, but remarkably well working method with a wooden block and a charged (stationary) lap in one of his last instagram posts ("Robrenz"). I'm sure you will be able to find it. Greetings, Alex
Would you mind sharing some details about the dust extraction on your D-Bit grinder? Is it homemade or stock? I have an import D-Bit grinder and I'm struggling to find a good concept for getting rid of the dust so any inspiration is appreciated :)
very interesting project, now I'll go looking for a avimo clinometer, I did like the visual of first bluing of the cast iron/Durabar lathe facing showing hardness deflection. you remind me of my old machine/engineer that designed and built test station for 747 aircraft laser ring gryos.
Happy New Year Alex. This was an excellent video, thank you for sharing it. I was almost wishing to see a target painted on the building that you were sighting. Stay safe and well :)
As always great video with some usefull informations. I'm curious about that sudden change at 25 degrees. Since 5 teeth engage at the same time it could be caused for example by a tiny burr or spec on one tooth.
Very good point, however, I couldn't find any obvious burr. The teeth look really fine and clean, even under magnification. But I assume that one tooth may have been cut with a "large" error.
Servus Fifi, unbedingt ein Wiedersehen. Wenn sich die Corona-Lage entspannt gibts bei mir ein Grillfest, wie damals beim Ralph. (Nur eben 120km nordöstlich). Gruß, Sepp
