I watched this a long time ago. It's an absolutely fantastic video about how micrometer-level precision came to be, and why it's been so important to the modern age.
I watched this a long time ago. It's an absolutely fantastic video about how micrometer-level precision came to be, and why it's been so important to the modern age.
I agree, it's super cool. I binged the whole channel a few weeks ago. I did have a point of confusion that got glossed over though. Maybe someone can explain? The creator explains how to get a...
I agree, it's super cool. I binged the whole channel a few weeks ago. I did have a point of confusion that got glossed over though. Maybe someone can explain?
The creator explains how to get a flat surface using three grinding blocks and then asserts that this gives flatness and right angles (and that you can build everything else you'd want like angles from those two). The flatness is well explained, but the right angle isn't obvious to me. Do you know how that works?
Without having seen the video, I’d assume that, given a known flat surface plate, you’d first grind/lap three maybe-squares checking against the plate until they have one flat reference surface....
Without having seen the video, I’d assume that, given a known flat surface plate, you’d first grind/lap three maybe-squares checking against the plate until they have one flat reference surface. Then, using the surface plate to constrain them along their known-good axis you would then a/b/c them against each other on their protruding side to bring them collectively into square. You would need at least three for the same reasons you would making the original surface plate.
If you ever want to get into the nitty-gritty of how parts are brought into reference tolerances, this is a neat video on how people did it (and still do it!) manually with a carbide scraping...
If you ever want to get into the nitty-gritty of how parts are brought into reference tolerances, this is a neat video on how people did it (and still do it!) manually with a carbide scraping tool: https://www.youtube.com/watch?v=QJXqHpSh3SE
Ooh! I was thinking that it might be interesting to make a flat enough surface to be able to do the gauge block stick together trick (there's got to be a better name for that), but I don't have...
Ooh! I was thinking that it might be interesting to make a flat enough surface to be able to do the gauge block stick together trick (there's got to be a better name for that), but I don't have any sense of how much effort is required to make it happen. Sounds like the video is a good place to get an idea though. I'll check it out
EDIT: Rats... Looks like I'm definitely going to need a vice and I don't have a good space for one. I guess I can add this to my list of idea for if I ever get a proper project space
Didn't watch, but once you can manufacture flat surfaces, I suppose you could: make a flat surface (pedestal) use a plumb line to get a square via the flat pedestal surface and gravity I don't...
Didn't watch, but once you can manufacture flat surfaces, I suppose you could:
make a flat surface (pedestal)
use a plumb line to get a square via the flat pedestal surface and gravity
Thanks. My initial thought was flattening a second piece and constraining it against the first to do the side, but I didn't think of flattening the side against a third piece to ensure...
Thanks. My initial thought was flattening a second piece and constraining it against the first to do the side, but I didn't think of flattening the side against a third piece to ensure perpendicularity.
I watched this a long time ago. It's an absolutely fantastic video about how micrometer-level precision came to be, and why it's been so important to the modern age.
I agree, it's super cool. I binged the whole channel a few weeks ago. I did have a point of confusion that got glossed over though. Maybe someone can explain?
The creator explains how to get a flat surface using three grinding blocks and then asserts that this gives flatness and right angles (and that you can build everything else you'd want like angles from those two). The flatness is well explained, but the right angle isn't obvious to me. Do you know how that works?
Without having seen the video, I’d assume that, given a known flat surface plate, you’d first grind/lap three maybe-squares checking against the plate until they have one flat reference surface. Then, using the surface plate to constrain them along their known-good axis you would then a/b/c them against each other on their protruding side to bring them collectively into square. You would need at least three for the same reasons you would making the original surface plate.
Ahh! That makes sense. I hadn't thought about doing it again. Thanks!
If you ever want to get into the nitty-gritty of how parts are brought into reference tolerances, this is a neat video on how people did it (and still do it!) manually with a carbide scraping tool: https://www.youtube.com/watch?v=QJXqHpSh3SE
Ooh! I was thinking that it might be interesting to make a flat enough surface to be able to do the gauge block stick together trick (there's got to be a better name for that), but I don't have any sense of how much effort is required to make it happen. Sounds like the video is a good place to get an idea though. I'll check it out
EDIT: Rats... Looks like I'm definitely going to need a vice and I don't have a good space for one. I guess I can add this to my list of idea for if I ever get a proper project space
Didn't watch, but once you can manufacture flat surfaces, I suppose you could:
I don't know exactly how precise this would be.
Fional has a good explanation in a separate reply if you're curious about a more precise way than depending on gravity for a plumb line
Thanks. My initial thought was flattening a second piece and constraining it against the first to do the side, but I didn't think of flattening the side against a third piece to ensure perpendicularity.