3 ms·

I'm guessing that this was a Moore jig grinder. There are few places in the world still capable of manufacturing a machine such as those. I'm not sure if even A

I'm guessing that this was a Moore jig grinder. There are few places in the world still capable of manufacturing a machine such as those. I'm not sure if even America still can. The fact that they go for $5000 on eBay is not a testament to them being easy to manufacture. It's a testament to their incredible abilities being underappreciated in the modern world, such that their manufacturers have virtually disappeared or gone into other businesses.

etrautmann 4y ago
I went on a deep dive on mechanical accuracy based on a post here on HN of the book authored by Wayne Moore, the founder of that company. Really fascinating to dig into how everything starts from extremely flat reference planes, and how that accuracy can get transferred to other geometries to build high accuracy cnc machines. https://ia800104.us.archive.org/20/items/FoundationsOfMechanicalAccuracy/Foundations_of_Mechanical_Accuracy.pdf https://ia800104.us.archive.org/20/items/FoundationsOfMechan...
- jbay808 4y ago
  Indeed, although the machines were designed to be manually operated and not CNC. The precision is such that they never wear out, because the surfaces are geometrically accurate to the point that even the leadscrew has full-area contact against its mating surface. Moore does not, and sadly cannot, make these machines anymore.
  - dahart 4y ago
    Are you talking about a specific model? They appear to be selling high precision jig grinders from Connecticut, which sounds similar to what the Justice Department’s statement is referring to. https://mooretool.com/jig_grinders.html#mooreprogrind https://mooretool.com/jig_grinders.html#mooreprogrind
    - jbay808 4y ago
      Yes, the #3. (I should have clarified that). The new CNC machines are not the same as the ones in the book the GP linked to. CNC use requires ballscrews and roller ways, instead of leadscrews and sliding ways. As a result the machine and its manufacturing process are quite different. But you're right, the article specifies that it's computer controlled, so probably not a #3.

etrautmann 4y ago

I went on a deep dive on mechanical accuracy based on a post here on HN of the book authored by Wayne Moore, the founder of that company. Really fascinating to dig into how everything starts from extremely flat reference planes, and how that accuracy can get transferred to other geometries to build high accuracy cnc machines. https://ia800104.us.archive.org/20/items/FoundationsOfMechanicalAccuracy/Foundations_of_Mechanical_Accuracy.pdf https://ia800104.us.archive.org/20/items/FoundationsOfMechan...

jbay808 4y ago
Indeed, although the machines were designed to be manually operated and not CNC. The precision is such that they never wear out, because the surfaces are geometrically accurate to the point that even the leadscrew has full-area contact against its mating surface. Moore does not, and sadly cannot, make these machines anymore.
- dahart 4y ago
  Are you talking about a specific model? They appear to be selling high precision jig grinders from Connecticut, which sounds similar to what the Justice Department’s statement is referring to. https://mooretool.com/jig_grinders.html#mooreprogrind https://mooretool.com/jig_grinders.html#mooreprogrind
  - jbay808 4y ago
    Yes, the #3. (I should have clarified that). The new CNC machines are not the same as the ones in the book the GP linked to. CNC use requires ballscrews and roller ways, instead of leadscrews and sliding ways. As a result the machine and its manufacturing process are quite different. But you're right, the article specifies that it's computer controlled, so probably not a #3.