Nov. 18, 2010 - Rich Youngworth

Rudiments and intricacies of cost-based tolerancing

Tolerancing is a lynchpin for the success of all optical hardware projects. In its broadest sense, tolerancing includes assessing robustness, guiding decision-making throughout the product development life-cycle, and assigning error bounds to construction parameters. Overall, the primary goal of tolerancing is twofold: ensure the system(s) will function properly (or have sufficient yield) and minimize cost. Traditional methods of tolerancing have quantitatively dealt with the former, with treatment of cost being qualitative or implicitly incorporated. Consequently, quantitative cost analysis is the de facto “holy grail” of optical tolerancing.

In this presentation requisite parts of “cost-based tolerancing” will be discussed, running the gamut from fundamental pieces through advanced methodologies. Different facets and phases will be highlighted from design for manufacturing to drive robust design through methods of tolerance assignment and analysis. The context will be with respect to traditional lens design, although the methodology has broad application for general electro-optical systems in addition to diverse non-optical fields. Attendees should garner the state of this subfield in optical design, as well as gain an appreciation for the rudiments and intricacies that aid in taking cost more explicitly into account. They may even find that tolerancing can be fun, but the presenter does not want to overstate any promises!

Rich Youngworth

Richard N. Youngworth, Ph.D. is the Director of Optical Engineering at Light Capture, Inc., an optical and optomechanical design firm providing consulting, innovation incubation, and product development services. His industrial experience spans diverse topics including optical metrology, design, manufacturing, and analysis. He has spent a portion of his industrial career at the Eastman Kodak Company and Ball Aerospace and Technologies Corporation. He has spent significant time working on optical systems in the challenging transition from ideal design to successful volume manufacturing. Dr. Youngworth is considered an expert, due to his research, lectures, publications, and industrial work on the design, producibility, and tolerance analysis of optical components and systems. He is active with national professional societies including publishing technical articles and chairing conferences. Dr. Youngworth has a B.S. in electrical engineering from the University of Colorado at Boulder and earned his Ph.D. in optics at the University of Rochester by researching tolerance analysis of optical systems.


DINNER reservations are required by 6 PM, November 14, 2010, the Sunday of the meeting. MEETING ONLY reservations are required by noon, November 16, 2010, the Tuesday of the meeting.

Please make reservations online. Reservations may also be left on the answering machine at 617.584.0266. We no longer have an email address for reservations due to SPAM. When making reservation requests, please provide the following information:

  • DINNER AND MEETING or meeting only
  • Name(s) and membership status
  • Daytime phone number where you can be reached (in case of change or cancellation)


Doubletree Guest Suites Boston Hotel - WalthamAddress:

550 Winter Street

Waltham, MA 02451

(781) 890-6767 (Map to Doubletree).

Networking—5:45 PM, Dinner—6:30, Meeting—7:30 PM.


Dinner will include --- and coffee, tea, or milk.

Vegetarian option available on request

Dinner Prices:

  Register on/before
DINNER Reservation Date
Late Reservation or
at the door 
NES/OSA Members and their guests $25.00 each $30.00
Students $15.00 $15.00
Non-members $30.00 (See NOTE Below) $35.00






NOTE: The NES/OSA has not changed dinner prices in several years but has been facing higher costs. We will maintain the current dinner prices for those reserving dinner on the requested date but still try to accommodate late reservations.

General Information on NES/OSA Meetings

Cancellations and No-shows:

If the meeting must be canceled for any reason, we will try to call you at the phone number you leave with your reservation. Official notice of cancellation will be on our answering machine.

We have to pay for the dinners reserved as of the Tuesday before the meeting, so no-shows eat into our cash reserve. If you will not be able to attend, please let us know as early as possible. Otherwise, no-shows will be billed.

Membership Rates:

Regular members $15.00
Student members free




NOTE: The extra $5.00 of the non-member dinner fee can be used toward membership dues if the nonmember joins and pays dues for the current year at the meeting.