OnShape Resource

My director just shared with me a great resource.  OnShape.  This online free CAD is a great resource for those at home looking to work on their designs for engineering or the 3D printer.  I have played with it for about 2 hours and fairly easily I made moderately complicated designs.  It is definitely not as powerful as solidworks and seems to lack things that we use often enough like weldments, sheetmetal, surfaces, structural analysis, and molds.  That being said, if you have an idea at home and can’t get access to our solidworks, OnShape might be perfect for you.  Another huge benefit is that you can use it with your district ChromeBooks.  Since the software is cloud based, you do not need to install it on your computer.  One more great thing you can do with OnShape rather than Solidworks is the ability to access and work on your parts on your mobile devices.

 

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Bridge Gussets

These are the bridge gussets I hand out during the bridge unit.  They are not required to use and I don’t make every possible style.  I only made these because it can help with a start and I think they are cute with the rivets drawn on.  I recommend groups use gussets on both sides of the node they are gusseting.

I print these on heavy paper (Card Stock) to have on hand.   It is up to the engineers in the group to decide the thickness of paper needed for their bridge.  These are one of 2 resources I make available to the groups.  The other being the 3/16 bridge sticks.   Refer to the Truss Bridge post for the specific rules

I share, with the class, that the best luck we have had is with white glue and binder clips. I have to admit that we don’t call them binder clips anymore.  Instead, we call them bridge clamps.

Here are the gussets:

Google Drive Bridge Gussets

Truss bridges

Truss Bridge Unit

We just started our Bridge Unit.  I will explain the rules and deadlines for students to refer to.  I am going to also add some links for help.

photo (1)The rules:

weight limit of the bridge: 200 grams

span needed to cross: 30 inches

Any material is allowed except pre-hardened glue or contained gases

The bridge must hold a 3in x 5in piece of wood that has an eyebolt and a carabiner attached.  This “car” must be placed within 3in of the center of the bridge.

Due date:

The bridge is due and should be ready for testing on Friday, May 1.  We will test the bridges the following Monday.

The bridge goal for weight prior to breaking 77 pounds.

The record so far is 121 pounds.

Some helpful links:

Garrett’s Bridges

Balsa Bridge competition site with lots of links

Truss designing online software