For Monday the 7th:
1.Please complete the tutorial for surface driven cuts in Mastercam (the spoon) located on the CNC site : http://risdbankcnc.squarespace.com/surface-cuts-hidden
2.Begin developing the design of your spoon. The challenge and review in class provided a basic overview of the construction method we’d like you to use. There is a video that covers a similar process here: https://vimeo.com/111593972
Dimensions of the spoon must be within 2″ wide x 8″ long x.75″ deep. No area should be under .0625″ in thickness, and this should only be at the thinnest point where the material tapers up from there. These will be cut from solid wood so design accordingly considering the strength and grain.
For class tomorrow have sketches of your design and at a minimum orthographic views completed in Rhino, but we’d encourage you to have the 3d model at least started so we can assist with any challenges you run into.
Here is a link to the mastercam and rhino reference files for the step stool we looked over in class Monday. There’s also the rhino 3d file of the stool. You can use the layer conventions shown in the rhino file to help simplify your operation selection in MasterCAM https://drive.google.com/drive/folders/1LHZFsByQpyNWEn0OLK5sicsPlSjzzFAx?usp=sharing
It appears there wasn’t an assignment posted last week, so we apologize for that oversight. Please upload a photo(S) of your model from this week to your google drive folders (in a sub-folder within the plywood stool folder named “Phase 2”) as well as a screen shot of your nesting layout.
For next week, please revise and refine your designs as was discussed during the reviews in class. We are falling a bit behind schedule at this point but this phase of this project is to finalize the design, resolving issues related to form, dimensions, structure and joinery. For some of you, this means more incremental improvements, others will require more drastic reworking of your design.
For next week, you will be required to create another model of your design. You can create another 1:2 scale model however for some we encourage you to make a full scale model. The material thickness should be scaled appropriately in either. If you decide to make a 1:1 model, you should use 1/2″ foam core and cut by hand. You can use the paper model techniques of the make2d command in Rhino to create patterns that you can print full scale on the plotter in the computer lab.
So we don’t fall too far behind, please prepare your rhino file for mastercam. Remember that MasterCam will be using contour cuts, so slots can be cut with a single line versus the laser cutter’s use of an outline. We can adjust the tool to cut on the center or either side of the lines, so you will need to plan accordingly when laying out the geometry.
Some things to keep in mind:
We would recommend you attempt to setup your mastercam file, but understand that we didn’t have a chance to demo today in class. We’ll do our best to come in this week for assistance with mastercam outside of class hours.
By next class the designs of your objects must be resolved fully. Please upload your stool 3dm files as well as photos of your models and nesting layouts as soon as you are able this week and email Chris and Cutter so we can review.
Using the Rhino file provided below as a starting point, build the object shown below, paying attention to the transition between surfaces.
If you are using windows and installed Rhino 6, Keyshot will not recognize a Rhino 6 .3dm file. To work around this, save your rhino file as a version 5 file. Keyshot will most likely be updated to work with Rhino 6 shortly. In the meantime, the Keyshot plugin for Rhino works between Rhino 6 and Keyshot.