2026-09-21T05:33:29Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/837192022-01-13T07:54:05Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
David R. Wallace.
Hohenberger, Matthew Paul
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2014-01-09T19:48:10Z
2014-01-09T19:48:10Z
2013
http://hdl.handle.net/1721.1/83719
864438300
Thesis (S.B.)--Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 31).
The pencil shoulder cutting device is a stepper motor driven mechanism to cut a small groove into the end of a pencil, which is needed for a novel seed-capsule endcap for a new pencil called Sprout. The pencil was developed by a team of MIT graduate students, and the shoulder cutting device is one step in an automated assembly process for Sprout. The device autonomously cuts a 0.0075in. deep shoulder into one end of the pencil using a 0.25in. end mill. The device includes a stabilizing sleeve that reduces vibration of the pencil during machining, and creates a vacuum seal so that chips from the pencil are cleanly removed. The cutting time for each pencil is 2s, with an absolute accuracy of 3.1x10-4 in. for the depth of cut after ten tests with the machine. The capsules fit correctly onto the shoulders when done by hand, and the design will be confirmed once the entire machine is running autonomously.
by Matthew Paul Hohenberger.
S.B.
31 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Design and fabrication of a pencil shoulder cutting device for a novel endcap
Thesis
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Publication
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<Abstract>The pencil shoulder cutting device is a stepper motor driven mechanism to cut a small groove into the end of a pencil, which is needed for a novel seed-capsule endcap for a new pencil called Sprout. The pencil was developed by a team of MIT graduate students, and the shoulder cutting device is one step in an automated assembly process for Sprout. The device autonomously cuts a 0.0075in. deep shoulder into one end of the pencil using a 0.25in. end mill. The device includes a stabilizing sleeve that reduces vibration of the pencil during machining, and creates a vacuum seal so that chips from the pencil are cleanly removed. The cutting time for each pencil is 2s, with an absolute accuracy of 3.1x10-4 in. for the depth of cut after ten tests with the machine. The capsules fit correctly onto the shoulders when done by hand, and the design will be confirmed once the entire machine is running autonomously.</Abstract>
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