June 10th, 2015, Meeting Minutes:
William Radigan, NMSUG President, Coordinated and ran the meeting.
FOOD: Dinner was provided by Whole Hog Café. Arrangements were made by Mike Mitchell. Mike has been taking care of the food at NMSUG meetings for several years now. Thanks again Mike!
The Wednesday, August 12 tentative meeting agenda includes:
- Ramesh Lakshmipathy from SolidWorks will be presenting on SolidWorks Simulation
- SolidWorks Certification (free test codes)
- Dave Furry (???) will be giving a presentation on Solidworks Routing.
John Milbery, SolidWorks Area Technical Manager for NM, Model Based Definition
John is a 20 plus year SolidWorks user who currently works on the SolidWork MBD development team.
Model-Based Definition, or MBD is used to eliminate paper drawings from design and manufacturing. Drawings traditionally are used to convey design intent to manufacturing. The US Department of Defense published MIL-STD-31000A which outlines the MBD protocols and requirements for technical design packages. It is intended to automate, reduce errors, and improve communication throughout design and production.
SolidWorks MBD is a SolidWorks add-on that combines existing SolidWorks dimexpert functionality with additional features and functionality to generate eDrawings and 3D pdfs that convey Product Manufacturing Information in accordance with MIL-STD-31000A.
MBD is a separate SolidWorks product. In addition to the Dim Expert functionality, SolidWorks MBD adds 3D Annotations, Geometric Dimensioning and Tolerancing, Bills of Material functionality, and 3D Dynamic Model viewing.
As an introductory illustration, John had a photo of a military tank next to all the printed paper Product Manufacturing Information for the same tank. The papers weigh more than the tank. The government and specifically the air force are the major proponent for MBD. One-third of a development budget is spent on 2D drawings yet sixty percent of them do not match the model. The Department of Defense wants to remove paper.
Other MBD standards in addition to MIL-STD-31000A include ISO 16792-2006 and ASME Y14.41-2012. The SolidWorks MBD team is working closely with the MIL-STD-31000A standards committee, hence SolidWorks MBD is 99% compliant at this time.
The three keys to creating an MBD environment: define relevant data on the model, organize the annotations in 3D space, communicate this information electronically. Dim Expert has been the underpinning and is used to fully define the model. The SolidWorks MBD auto-dimension scheme, tolerance status, and GD&T rule checks all work with imported geometry. There is also an optional tolerance stackup analysis. MBD is more than just 3D dims on views because it captures the zoom state and ultimately will capture the display state (still being developed).
John showed video of a gearbox with all the design information created by SolidWorks MBD. The user can see and rotate the usual 3D Views. A real show-stopper was the SolidWorks Dynamic Annotation Views (SolidWorks patent pending) which are very cool. Dims and annotations fade in and out as the model is rotated. All the functionality works seamlessly even for section views. To share the model, the SolidWorks MBD licensee can generate 3D PDFs using any number of included 3D pdf templates.
SolidWorks MBD can easily integrate existing dimensions from a legacy model. SolidWorks MBD supports section views and configurations.
To publish MBD files, the DOD prefers the 3D PDF. SolidWorks MBD also leverages eDrawings. A library of PDF templates is included. Choose a template, choose the views, choose the custom properties then generate the pdf. The user can rotate/revolve the model in the main view window. 3D pdfs are much smaller than SWX drawing files. The end-viewer can interrogate the pdfs.
In MBD Assemblies: All 3d views are available, the user can hide and show items. Selecting a part highlights the corresponding row in the adjacent BOM table. It is remarkably slick.
Generally speaking MBD is early in the adoption pipeline. Adoption is slow outside the DOD. It is intended to automate, reduce errors, and improve communication throughout design and production.
There is talk about a Deconstruction feature that would start with the PDF and generate 2D drawing sheets.
TheSolidWorks MBD add-on, list price is $1995 with a $495 annual maintenance fee.
There are some informative SolidWorks MBD videos on You Tube. Check it out.
VERY GOOD DEMO. THANK YOU JOHN.
Mathew Fetke CSWP Mold, Surfacing, Weldments
Mathew continued our coverage of SolidWorks certifications. He went through the Mold Design sample exam and gave pointers along the way. In general:
- Study the command set and take the sample tests available athttp://www.solidworks.com/sw/support/mcad-certification-programs.htm.
- If you can do the Sample Exam in 1/2 hour or less then you are probably ready for the actual exam.
UNM FSAE Team
Formula SAE or FSAE is an international collegiate engineering design competition in which teams design, build, test and race a Formula-1/Indycar style racecar. The cars are not only judged on their performance metrics, but also on their design and financial feasibility. Andrew Hegge (Drivetrain Team Lead) and Aarya Engineer (Marketing Manager) from the University of New Mexico FSAE team (Lobo Motorsports) were on hand to show how they use SolidWork to address their design and manufacturing needs. In addition, several other members of the student design team were in the audience.
FSAE Program has 11 international competitions. UNM has participated in the program since 1997. There are 50 members on the 2015 team. Lobo Motorsports is currently ranked 5th (out of 170) nationally, and 17th (out of 511) internationally.
FSAE is a three semester program: design, build and test, that teaches communication, project management, and engineering skills. The overall project is managed with teams which are as follows:
The current car uses a continuously variable (snowmobile) transmission (CVT), and a toothed belt drive to the wheels. The aerodynamics create 440 lbs of downforce at 70 mph. The car can produce 1 G of acceleration and 1.5 G of lateral acceleration.
The cost to build the car is $30,000. The team has to raise 2/3 of the money.
They operate on an $80,000 budget. Some German teams have a budgets in the hundreds of thousands of dollars, yet the UNM team historically has been very competitive despite its modest budget. Andrew Hegge attributes this to the team devotion and also always iterating on prior year's designs and data, in other words, they never start from scratch.
Their 2016 goal is to be in the top ten overall. The entries are graded on design, autocross, and endurance.
They have to keep the CG very low enough to pass a 45 degree center of gravity tilt test. The fluids cannot leak on the 60 degree tilt test.
Design for Manufacture principals are key to getting the engine in and out of the car easily. They use toothed belts over chains. The wings are molded and laid up with carbon fiber.
From 2014 to 2015 they transitioned to 10" tires rather than 13" tires for a lower CG and lower rotational mass. This required a different chassis geometry and new brakes (smaller rotors, calipers). They also created a modifed CV joint to save weight. They use SolidWorks simulation extensively. Changing tire diameter also required updating the entire suspension geometry.
The student-welded chassis has 2500 ft-lbs per degree of torsional stiffness.
The wing is mounted to the suspension A-Arms and not the chassis which makes the downforce go straight to the tires.
Brake torque must always exceed engine torque!
The team will be competing in Lincoln, Nebraska this week (June 17-20) for the 2015 competition. Check out this website for more information:http://students.sae.org/cds/formulaseries/west/ . Also a great deal of competition and team information is available on social media (Facebook, Twitter, & and Instagram).
Ironically, the UNM Mechanical Engineering Department does not teach SolidWorks in its core CAD curriculum. Historically, Dassault Sytemes/SolidWorks has been a major FSAE supporter. The teams uses educational versions of the software. The department allocates six computers but it sounds like they are not very good SolidWorks computers. They have student licenses and they do not have professional/premium licenses.
Lobo Motorsports is always looking for sponsorship, machine shop resources and monetary support. Please contact Lobo Motorsports, or William Radigan if you are interested in donating time or money to the program.
Additionally, NMSUG members have been invited to participate in the 2016 Secondary Design Review. It is currently scheduled for August 5th, 6:00 PM, ME Building Room 218
THIS WAS AN OUTSTANDING PRESENTATION FROM A BRIGHT GROUP OF ENGINEERING STUDENTS RIGHT HERE IN OUR OWN COMMUNITY!