公开(公告)号：US11999006B2

公开(公告)日：2024-06-04

申请号：US17098359

申请日：2020-11-14

Applicant: Massachusetts Institute of Technology

Inventor： Prashant Patil ,  Daniel Banks ,  Salima Bahri ,  William Langford ,  Camron Blackburn ,  Zachary Fredin ,  Robert Griffin ,  Neil Gershenfeld

IPC: B23K26/00 ,  B23K26/55 ,  B28D5/00 ,  G01R33/30 ,  B23K103/00

CPC classification number: B23K26/0006 ,  B23K26/55 ,  B28D5/0058 ,  B28D5/0082 ,  G01R33/307 ,  B23K2103/50

Abstract: A method for fabricating MAS NMR rotors and drive caps made of diamond to increase the maximum achievable spinning frequency and enhance MAS NMR sensitivity and resolution. Diamond is an excellent choice for making MAS NMR rotors due to its high tensile and flexural strength, however, micromachining diamond is difficult due to its hardness. Although laser cutting is often employed to cut diamond sheets, this process cannot be used to create the high aspect ratio and small features required for MAS NMR rotors. In the present invention, a laser micromachining process is used to create the desired high aspect ratio while maintaining the small lateral features. In this process, the laser is used to first convert the diamond into graphite followed by a conversion to carbon dioxide in the presence of oxygen. To create a rotor, a rectangular log has a center hole drilled by the laser, and is then micromachined into a hollow cylinder.

公开(公告)号：US20180009110A1

公开(公告)日：2018-01-11

申请号：US15031545

申请日：2016-04-22

Applicant: Massachusetts Institute of Technology

Inventor： William Langford ,  Matthew Eli Carney ,  Benjamin Jenett ,  Neil Gershenfeld

IPC: B25J9/16 ,  B25J5/02 ,  G05B19/402 ,  G01L5/00 ,  B23P19/04

CPC classification number: B25J9/1687 ,  B23P19/04 ,  B25J5/02 ,  B29C64/00 ,  B33Y10/00 ,  B33Y30/00 ,  G01L5/0085 ,  G05B19/402 ,  G05B2219/45064 ,  G05B2219/49023 ,  G06F17/50 ,  Y10S901/09

Abstract: An alternative to additive manufacturing is disclosed, introducing an end-to-end workflow in which discrete building blocks are reversibly joined to produce assemblies called digital materials. Described is the design of the bulk-material building blocks and the devices that are assembled from them. Detailed is the design and implementation of an automated assembler, which takes advantage of the digital material structure to avoid positioning errors within a large tolerance. To generate assembly sequences, a novel CAD/CAM workflow is described for designing, simulating, and assembling digital materials. The structures assembled using this process have been evaluated, showing that the joints perform well under varying conditions and that the assembled structures are functionally precise.