Archive for the ‘General’ Category

Convert Durometer to Young’s Modulus

Thursday, July 14th, 2011

If you work with rubber and plastic materials frequently, you more than likely have access to a stress-strain curve for use in Simulation.  What can you do, though, if you don’t have all the required material properties for analysis?  If you’ve ever searched for material properties via MatWeb, IDES or other sources, you’ll likely find the hardness of plastics and rubbers listed in Shore-A or Shore-D – and no Young’s Modulus.  Fear not!  There is a simple calculation to convert a Shore durometer to Young’s Modulus, which is sufficient to get you started with your analysis work.

Before I show you the calculation, you should be aware that there is not a direct relationship between a Shore scale and Young’s Modulus!  The calculation allows you to approximate ‘E’ based on a range of Shore-A (20 to 80) or Shore-D (30 to 85) durometers for simple static analysis.**  If you routinely work with plastic and rubber materials, you should be using SolidWorks Simulation Premium with the actual stress-strain curve for the material(s) you design with!

For a durometer given in Shore-A, multiply this value by 0.0235.  Then subtract 0.6403 from this result.  The next step is to find the inverse base-e logarithm of this new result.  The answer is an approximation for Young’s Modulus in megapascals (MPa).  To convert this to pounds per square inch (psi), simply multiply this number by 145.0377.  If you’re like me, word problems were never a strong suit!  Here are the equations to input into Excel for a Shore-A or Shore-D durometer – or download the Excel spreadsheet here.

Shore-A to Young’s Modulus (in MPa):
=EXP((Shore-A Durometer)*0.0235-0.6403)

Shore-D to Young’s Modulus (in MPa):
=EXP((Shore-D Durometer + 50)*0.0235-0.6403)

Replace the ‘Shore-A Durometer’ or ‘Shore-D Durometer’ with either a number or the cell location of the value.

** Making Engineering decisions based upon analysis results with this “material property conversion” is not recommended.

Bill Reuss

Bill Reuss, CSWE, CSWST, CSPST
Application Support Engineer
3DVision Technologies

SolidWorks Louisville User Group Meeting – June 21st, 2011

Thursday, June 2nd, 2011

2011-0601 SLUG Logo

The next SolidWorks Louisville User Group meeting – known locally as “the SLUG” – has been scheduled for Tuesday, June 21st, 2011.  It will be held at the University of Louisville Henry Vogt Engineering Center.  The meeting details are below.  If you are located in the Louisville area and have not attended a SLUG meeting, I only have one question – why not?

The topic for this meeting is “How do YOU use SolidWorks?”.  Members of the local SolidWorks Community – Scott Calvert of Design Network, Norman Boulard of Boulard Designs and Bryan Ray of  Samtec, Inc. – will be presenting some of their personal workflow and habits.  As we all know, each of us have our own way of doing things in SolidWorks.  Seeing how other individuals use SolidWorks is a great way to pick up on tips, shortcuts and learn new tools for driving SolidWorks and improving our designs.

Details

Date:  Tuesday, June 21st, 2011.  6:30pm – 8:30pm

Location:  University of Louisville, Henry Vogt Engineering Center (corner of S. 3rd St. and Eastern Parkway)

Agenda (times are approximate):
6:30pm – Registration, eat & greet
7:00pm – Meeting introduction
7:15pm – “How do YOU use SolidWorks?” presentation
8:15pm – Q & A, Next meeting discussion & prize drawings

Please RSVP to Paul McCrorey (McCrorey Digital), SLUG President, so the group leaders can plan foodstuffs accordingly.
Email:  paul.mccrorey@insightbb.com

I look forward to seeing you at the SLUG meeting!

Bill Reuss

Bill Reuss, CSWE, CSWST, CSPST
Application Support Engineer
3DVision Technologies

Mesh Failure Diagnostics, Part 2

Monday, May 16th, 2011

Last month, I wrote about Mesh Control and described a process using the Simulation Advisor to fix mesh errors.  If you prefer to operate without the proverbial ‘phone-a-friend’ option, you can always turn the Simulation Advisor off by un-checking the box in your Simulation Options, as shown.  When you uncheck this box, you still have the option of accessing the Simulation Advisor from the Command Manager by selecting the appropriate Advisor in the pull-down menu.

2011-0512a Sim Advisor Off

When an assembly failed to mesh in Simulation 2010, you had to know your assembly components well to determine which part(s) failed to mesh.  Recall that the Simulation Feature Tree looked like this:

2011-0512b 2010 Mesh Failure

With SolidWorks Simulation 2011, however, we now have a visual indication for which parts failed to mesh in the Simulation Feature Manager Design Tree.  Notice all of the component icons that are colored red?  Simulation 2011 provides this visual feedback to let you know where the mesh failures occurred.  If you right-click on any of those parts and select ‘Create Mesh’, this will start the Mesh Control dialog for the selected part.  Apply a mesh control and click ‘OK’ to mesh the part.  Using this method, you have to apply mesh controls to a single part at a time.  If you control-select several of the red (failed) parts from the Simulation Feature Manager Design Tree, you need to right click on the Mesh folder and select ‘Apply Mesh Control’.  Note that when you choose this method, you will need to recreate the mesh for the entire assembly.

2011-0512d RMB Create Mesh

Bill Reuss

Bill Reuss, CSWE
Application Support Engineer
3DVision Technologies

SolidWorks Sheet format

Monday, May 9th, 2011

Yesterday I caught Great Aunt Eleanor browsing on my computer. I hate it when she does that -she always finds a setting or something I am doing wrong and makes fun of me.

Yesterday was no exception.

“Why do you have so many SolidWorks drawing templates?” she queried.

I think I have her now, she thinks she is so smart. I explain to her that I need to have a drawing template for each sheet size (A, B, C, D, & E) and I need a template because sometimes I design in metric, sometimes in old people units. (I call inches “old people units” -’cause it gets under her skin a bit). “Five sheet size times two units equals ten files!” I say with a smug look on my face.

“What if you need to make a change to a SolidWorks option, or SolidWorks adds a new option that you want to incorporate into your templates? That’s ten files you need to update, ten times the setup, ten times for you to make a mistake. You should be using sheet formats. They make building your template library easier.” she replied shaking her cane at me, heading back to her computer muttering about mining more gold than some guy named Deathwing.

“’cause I don’t want to!” I shout. “Sheet formats are stupid!”

Okay, at this point I had no idea what a sheet format was, but I couldn’t let her know that.

Sheet formats (.slddrt) are actually very cool. They are really a simple file that contain only your titleblock. It is just a sketch with some properties.

Your SolidWorks document settings are stored in the .drwdot file. If you work in metric and imperial you’ll typically need only two of these files, one for each. Create five titleblocks [sheet formats] and you only have seven files to maintain rather than ten. If in the future, you need to make a change to a drawing setting, all you have to do is update the two .drwdot files -the sheet formats are only overlays.

I know this is a little confusing, so let me show you how to do it. First, open your drawing template, delete the sheet format

DeleteSheetFormat

go through and set all of the document properties

DocumentProperties

and save this file as a .drwdot file. Call it something like: “Old People Drawing”

Now, when you want to make a new drawing with your inch settings, Choose the “Old People Drawing” template. Since this template does not have a sheet format, SolidWorks will ask you to choose the sheet format you want to use:

sheetsize

All that is left is to make your sheet format.

Build your sheet format (typically just your titleblock and boarder) with your sketch tools and save it

SaveSheetFormat

in the same location where your sheet formats are located:

SheetFormats

Make a different sheet format for each drawing size or titleblock and you are good to go! Much easier to manage.

Another point to Great Aunt Eleanor.

Jeff Sweeney

Jeff Sweeney
Engineering Data Specialist
3DVision Technologies

Dynamic Clearance-Worth the Price of Admission

Friday, March 18th, 2011

In Essentials class this week, one of the attendees was very impressed with the Dynamic Clearance option available when using ‘Move Component’ in an assembly.  He commented that neither he nor the few other Engineers and Designers he works with knew about this functionality.  Considering this attendees’ company designs and manufactures non-static equipment, I am somewhat surprised.

As a refresher, the Dynamic Clearance option is available when using ‘Move Component’ on the Assembly Command Manager tab.  After you select ‘Move Component’, you have several options.  As you can see from the screen capture, I have selected the male and female yoke as the two components that I’m interested in knowing the Dynamic Clearance between.  Once I have selected the components and clicked the ‘Resume Drag’ button, I select a mobile component of the assembly and start to move it.  This dimension in the graphics window represents the current minimum clearance between the components I selected.  Also, you should note that in the Property Manager window, the dialog at the bottom of Dynamic Clearance provides an indication of the minimum clearance between the components, shown as [min = 0.079], as soon as you start to drag/move components.  Then all you have to do is watch your on-screen feedback to move the components to that closest position.

Now that you’ve added a new tool to your arsenal, take a look at some of your movable assemblies and see if you have less clearance between components than you thought.  As another Essentials attendee commented, not all of our minimum clearance conditions occur in our orthogonal views!  For him, the Dynamic Clearance functionality was “worth the price of admission”.   I hope the rest of the class was, too!
2011-0317 Dynamic Clearance

Bill Reuss

Bill Reuss, CSWE
Application Support Engineer
3DVision Technologies

Ecoworks approved for SR10 (P400) Support

Monday, February 14th, 2011

Dimension has approved Ecoworks for use with P400 in the current Dimension clean station. Now you can have all the benefits of Ecoworks without purchasing a new clean station. Ecoworks is a more environmentally friendly solution to dissolve support material. It no longer requires a hazmat label to ship, no special PPE is required, and most companies will be able to safely dispose of it down the drain.

Introduction:
Ecoworks cleaning agent is designed to remove support materials from models built using the FDM process with SR-10 (P400-SR), SR-20, or SR-30 soluble support materials. The cleaning agent is both user- and eco-friendly. No personal protection equipment is required when handling the cleaning agent and disposal of the used solution requires only dilution with clean water to meet generally acceptable world-wide disposal standards*.

Several factors impact support removal effectiveness and time:
* Agitation/Circulation (varies by tank type and manufacturer)
* Temperature
* Part Geometry and Amount of Support Material
* PH Level
* Time

Results will vary based on the above factors. Below are recommended guidelines for using Ecoworks.

Temperature:
Water temperatures between 70°C and 75°C are most effective for dissolving support materials. Temperatures above 75°C may cause models to distort. Dissolve times with temperatures below 70°C will take longer.

Ecoworks Amounts:
To optimize support removal and meet generally acceptable pH levels for waste water disposal, the following amount (number of packages) of Ecoworks should be used:
One package (foil bag) for every 2 gallons (7.5 liters) of water. The entire contents of the package (both sides A and B) should be used.
For each additional two gallons (7.5 liters) of water, add an additional package of Ecoworks. For example, an 8 gallon (30 liters) tank requires 4 packages of Ecoworks. With the above ratio of Ecoworks and water, the pH level of clean solution will be approximately 9.8.

Solution Life:
How often you change the solution is dependent on the tank you use, how you maintain it, and the complexity of your parts. As support materials are dissolved over time, the pH level will decrease and dissolve times will increase.
For optimal effectiveness, the solution should be changed after 1.5 lbs. (0.68 kg) or approximately 40 cu. in. (655 cu. cm) of support material has been dissolved.

Solution Disposal*:
Waste Water Profiles are available for each of the three soluble support materials –
SR-10 (P400-SR), SR-20, and SR-30. These profiles are based on the dilution of used solution with an equal amount of fresh water. For example, when disposing of 4 gallons (15 liters) of used solution, dilute with 4 gallons (15 liters) of fresh water.

Download Waste Water Profile Data-sheet

Brendon Breitenstein

Brendon Breitenstein
Field Service Engineer
3DVision Technologies

EDS Man and Mike Puckett talk about the CSWE Exam

Monday, February 7th, 2011

Hello everyone and welcome to the show. Today we have a special guest, Mike Puckett, Certification Specialist with Dassault Systèmes SolidWorks Corp.

Today we are talking about the Certified SolidWorks Expert exam that was introduced a little over a year ago at SolidWorks World 2010.

Hi Mike, thanks for time being a guest on the show. A year ago only 75 people were even qualified to take the CSWE exam. How many CSWE’s are there today?

We are currently at just about 400 CSWE’s around the world.  There are only about 600 people who meet the criteria to even take the exam, so we feel that’s a pretty good adoption rate.  Of course a large percentage of that group of 400 CSWE’s are tech support people at SolidWorks  Resellers, so the group of CSWE’s that are customers is still a low number around 75.  The exam is really a customer facing exam, but it’s the nature of tech support people to be somewhat proud of what they know, and they see the CSWE as a way to bolster their credibility.  When a tech support person writes in to say they passed the CSWE exam, we tell them to move on to the next challenge which is the tech support exam which is one of the most challenging exams we have for our resellers.  By the way I just took a look at your account in the system and don’t see a tech support certificate, perhaps that should be a goal for 2011!

Hey! Aren’t my records supposed to be private? Aren’t there HIPAA laws here to protect me? My plans are to get the support certificate and CSWE this year. For the record I passed the CSWP back when it was an eight hour exam…when it was a big boy exam. I personally think I  should be grandfathered in to both of these certifications!

Have you noticed an increase in the number of people taking the advanced exams since the release of the CSWE?

If I ran a report to get that number I’m sure we would see an increase.  When we launched the exam at SolidWorks World 2010 there were only 77 people that qualified to take it.  Now with about 600 qualified people the number of advanced topic exams being passed has certainly gone up.  I want to stress however that we are not driven by numbers coming from these kinds of reports.  We run the numbers every now and then just to get a snapshot of what’s happening, but the real feedback comes from the emails we get telling us the good and the bad about the exams we offer.  Much like the SolidWorks software, our exams are driven mostly by what our users want.  In fact the CSWE exam was created as a direct result of conversations I had with users at SolidWorks World 2009.

Is it true the CSWE’s have a special handshake that they are forbidden to share with mere mortals?

Well if you get on the ball and get your CSWE this year, you can find out!  At SolidWorks World this year we did have a private party, exclusive shirts and ribbons for CSWE’s in attendance!  As the group of CSWE’s continues to grow I’m certain we will start to do more exclusive stuff for just them.  We have internally talked about quite a few different things we could possibly do including making the annual CSWP party at SolidWorks World a CSWE party, but nothing has been decided, and when we come to those decisions we’ll do what’s best for our users.  Ultimately though the goal is to try to give as much access to the CSWE exam as possible.
Interview

Many say the actual CSWE exam is easier than the advanced topic prerequisite exams. Is this by design or do you disagree with this statement?

Well the structure of the CSWE exam itself is completely different then all the other exams we have.  In fact when I showed the first version to the certification team in the fall of 2009 they were pleasantly surprised to see that I had taken a different approach with it.  The CSWE is different in the way that it presents you with modeling challenges that test your ability to select the correct functions to use to solve those challenges.  It assumes you know all the commands that it would take to solve each problem, instead of testing you on if you actually know how to use a command.  You then have to use those various combination of commands to get to the solution.  As you can imagine in a real world working environment, when you are presented with a modeling challenge, there are several roads to go down to solve it, but most of the time only one of those roads are correct, and being a timed exam it’s very beneficial to choose the correct road from the outset!

The test has been out for over a year now. Do you keep any statistical analysis? What percent of people pass the first time? What areas do most people struggle?

Again since we are not so concentrated on numbers we don’t try to quantify what we do based on those results.  The feedback has mostly been that it’s a fun and challenging exam, and that some of the problem sets are pretty tricky to solve.  There are a lot of “I forgot I could have done it that way” moments in the exam.  We get the occasional lashing by a user somewhere who says it was easy, but we would hope that there are users out there who feel that way, it means that SolidWorks is doing a good job to help people learn and understand how to use the software.  Ultimately what we are seeing is that the people taking the time to achieve the CSWE certification are the power users.  Because of that we see a pretty good passing rate.  It would be akin to giving a swim test to a bunch of Navy Seals, their abilities to be at that level makes it pretty easy for them to succeed.  If I had to pick out one topic of the exam most people struggle with, it would be the Top Down Assembly Design questions.

Is there a charge to retake the exam if you fail the first time?

Technically, yes.  Unofficially no.  I will say that being connected to the SolidWorks Community has tons of benefits that may not be apparent.  For example I had a user group leader contact me in December saying that he wanted to pass his CSWE by the time SolidWorks World started so I made him a deal.  If he passed his three advanced topic exams, I would give him a shot at the CSWE for free.  He passed it two nights before leaving for San Antonio.  When we launched the exam we really wanted to make it a certification that only those who really wanted it, would go after it.  Much like the old proctored CSWP exam.  That’s why we priced it at $149 instead of $99, and that’s the reason for the prerequisites of passing three advanced topic certifications, along with a CSWP to even be able to take the CSWE exam.  We are still pretty set on having people pay for their first go at the exam, but after that it’s really about helping people achieve that top level certification.  In the upcoming year we’ll continue to work with user groups, blogs, and other community outlets to try to bring more people into the CSWE family, there will even be some free CSWE exams to be had in that mix from time to time!

Thanks so much Mike, great talking with you again.

Jeff Sweeney

Jeff Sweeney
Engineering Data Specialist
3DVision Technologies

SolidWorks World 2012 Location is….

Wednesday, January 26th, 2011

Well it has just been announced where SolidWorks World 2012 will be.
It’s going to be February 13th thru the 15th.

I’ll give you some hints on the location:

  1. This place has 70 miles of beaches surrounding it.
  2. The GPS coordinates are: 32°42′54″N 117°09′45″W
  3. The average high and low temperatures in February are 66°F/51.5°F.
  4. There is an average of 6.6 rainy days and 228.8 hours of sunshine.

Tired of guessing? Well the location for SolidWorks World 2012 is….
San Diego, California!!!

I look forward to seeing everyone there.

 

Josh Spencer

Josh Spencer
Application Engineer
3DVision Technologies

(source for data: Wikipedia)

E3.WireWorks planning big things at SolidWorks World 2011

Friday, January 14th, 2011

Zuken, the manufacturer of E3.WireWorks, a windows-based modular, scalable, and easy-to-learn system for engineering design of wiring, harnesses, cable assemblies, control panels, hydrolics and pneumatics, will be at Booth #200 at this years SolidWorks World event at San Antonio, TX.

Visit their booth to see a demo of their E3.WireWorks solution and see how it integrates electrical and fluid design with SolidWorks.

In addition, Patrick Hackney will be doing a presentation at the conference on the integration of E3.WireWorks and SolidWorks on Tuesday, January 25 at 1:30pm in room 008AB.

Follow Zuken as they tweet before, during and after the event Twitter@ZukenAmericas
And be sure to follow us @3DVisionTech as we too tweet from the event.

Carrie Cavanaugh

Carrie Patrick
Marketing Manager
3DVision Technologies

Year End Countdown 2010

Monday, January 3rd, 2011

In last year’s count down, I snuck in a prediction that Google Wave would be big in 2010. Google didn’t take long to prove me wrong. This year, I’m going to do much more looking back than looking forward. (I find I am slightly more accurate that way.)

Here are my top cool CAD related things from the year that was 2010:

1 – SolidWorks on the cloud
When SolidWorks gave their first sneak peak of what SolidWorks might look like on the cloud last year at SolidWorks World, panic flowed out into the streets. “Change is bad! Change is bad!” they shouted. It surprised me how few people caught on to the fact that this technology is years down the road, and even more years from being forced upon us. (If ever!) The really sad part is that I am certain SolidWorks will never give us such a long term preview again.

2 – DraftSight
I’m a big fan of free software, especially when it is so much superior to some of those other .dwg clones that cost crazy money. I am so, so, eager to play with the Linux version when it comes out.

3 – EPDM’s Update references
The SolidWorks Enterprise PDM developers pretty much put all of their eggs in this basket with the new tool; if this one flopped there wasn’t much else new in EPDM 2011 to fall back on. Luckily this one is a home run for many users.

4 – Cincinnati tech summit
People came from as far as Pennsylvania to attend this one. The sessions I attended were certainly SolidWorks World caliper. I hope SolidWorks continues these. “SolidWorks World close to home!” For those of you scoring at home, Richard Doyle did not wear a tie.

5 – SolidWorks:Heard! – Episode 289
Okay, okay this one is certainly a bit of self promotion….but [A.] It was fun to do and [B.] It is my list, I can say what I want.

6 – DriveWorks 7
We waited a loooooong time for this one! A few days ago I was looking at some DriveWorks 6 screen shots – like comparing DOS to Windows. How did we ever get anything done back in the old days of 2009?

7 – More assembly features in SolidWorks
Chamfers, fillets and sweeps! Imagine what life would be like if we could do everything at an assembly level?

8 – Let’s Go Design
I know it is a marketing campaign. Here was my initial concern with it: Some of the most important parts of being an engineer is dealing with cost and time schedules. I had a fear that because Jeremy Luchini doesn’t really have these two elements, it would be like watching a Spielberg creation. (Spielberg is cool, but more fantasy than reality.) Those fears appear to be unfounded and the series has been pretty fun to watch. I was also afraid SolidWorks would kill it too soon like they did with 3 Dudes. Luckily it looks like they are going to let this one run a little longer.

9 – SolidWorks V6
I don’t like that the SolidWorks community seems to call the next generation of SolidWorks V6, but it is just a name I guess. Go to your SolidWorks install directory, look at all the Catia files in there? Not sure when they started appearing, but it appears Catia and SolidWorks are finally working together, the best of both worlds is coming.

Jeff Sweeney

Jeff Sweeney
Engineering Data Specialist
3DVision Technologies

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