Re:The Polar Bear – Open-Source, Multipurpose CNC Machine wi...
by dekhn on Thursday August 19, 2021 @03:45PM
(#28238430)
it depends on how much you're willing to spend, and in some areas, whether your company is allow to import specific devices which are highly precise.
Many of the most challenging precision and accuracy problems were well understood and documented quite some time ago (books like Moore's Foundations of Mechanical Accuracy). Even today with DIY devices, people are getting impressive results, but often it's hard to say for sure just how accurate something is without expensive calibration tools and custom built environments. For example, if you're working with high precision machining, the temperature of the room matters (since the work will expand or contract) so you will probably need a climate controlled room inside a climate controlled room, etc. Machine needs to be rigid, feedback control, sophisticated optical sensing for position, all makes this very expensive.
I think the folks who make large glass mirrors do well under 0.5 micron accuracy.
Many of the most challenging precision and accuracy problems were well understood and documented quite some time ago (books like Moore's Foundations of Mechanical Accuracy). Even today with DIY devices, people are getting impressive results, but often it's hard to say for sure just how accurate something is without expensive calibration tools and custom built environments. For example, if you're working with high precision machining, the temperature of the room matters (since the work will expand or contract) so you will probably need a climate controlled room inside a climate controlled room, etc. Machine needs to be rigid, feedback control, sophisticated optical sensing for position, all makes this very expensive.
I think the folks who make large glass mirrors do well under 0.5 micron accuracy.