im failing at lofting.

Jose_Montalvo

Hello all,

             So I have this lab assignment where I am designing a fountain pen nib and I need to use the loft feature. I set up some basic "sections" but I can not seem to get the loft to actually happen. How do I troubleshoot this?
Any help is appriciated.

I linked the file if comments work better. 
https://cad.onshape.com/documents/144f68ba1512fa8791f0e8f9/w/d0af06caadf3c7f828e19bb5/e/43a096464017a12b3af73bef

John_P_Desilets

@Jose_Montalvo

A closed profile has zero opening in the sketch.  Below on the left is a closed profile and will highlight the closed regions grey. 


Since this is most likely made from sheet metal, it might be easier to try making it from a sheetmetal model in Onshape. Create the body as an extruded surface. Use the sheet metal tool to thicken the surface to form the sheet metal part. In the flat pattern view, sketch the area you wish to cut to form the tip.  Below is an image of what I described. 

Here is a link to a few examples. If you have more questions on creating this as a loft let us know. Good Luck!

https://cad.onshape.com/documents/3686d7b32f4c630fb79f2afb/w/2f682331618fa2512cce6151/e/a25050ecf9f2a104d7320485

John_P_Desilets

Hello @Jose_Montalvo

Thank you for reaching out. Do you happen to have an image of what you are looking to produce for a final part? 

In order to create a solid loft, the loft profiles need to be closed. If the profiles are kept open, a surface loft must be created. 

This is a surface loft between some of the profiles from your example.  Can you describe how the feature should look? 

Jose_Montalvo

 Do you happen to have an image of what you are looking to produce for a final part? 

Hello @John_P_Desilets
Here are some pictures.


source https://www.gouletpens.com/collections/replacement-nibs/products/lamy-steel-nib-black?variant=11884860538923

In order to create a solid loft, the loft profiles need to be closed. If the profiles are kept open, a surface loft must be created. 

So a closed loft profile is analogous to  how a circle is a closed profile? Or is closing a command I would do?

Would applying thickness to it also be considered closing it?

John_P_Desilets

@Jose_Montalvo

A closed profile has zero opening in the sketch.  Below on the left is a closed profile and will highlight the closed regions grey. 


Since this is most likely made from sheet metal, it might be easier to try making it from a sheetmetal model in Onshape. Create the body as an extruded surface. Use the sheet metal tool to thicken the surface to form the sheet metal part. In the flat pattern view, sketch the area you wish to cut to form the tip.  Below is an image of what I described. 

Here is a link to a few examples. If you have more questions on creating this as a loft let us know. Good Luck!

https://cad.onshape.com/documents/3686d7b32f4c630fb79f2afb/w/2f682331618fa2512cce6151/e/a25050ecf9f2a104d7320485

Jose_Montalvo

Awesome thank you.