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Proper Method to Produce Lobster-back Duct Bends

lawrie
in Drafting
3 1 Beginner
One type of industrial component I have been involved with the design and manufacture of is lobster-back bends. This type of duct bend is made up of segments cut from flat sheets or plates, rolled into cylindrical parts, then assembled. These can be light sheet-metal or manufactured from thick plate. This quick tutorial is a supplement to the one I produced an outline of a method I have used modeling this type of component using Alibre Design. As this supplement concerns producing parts ready for manufacture and applies to whatever software you have used, that is not important as this short tutorial is to outline turning your modeled bend into the flat profile ready to be made into the completed bend. In this modern world, the bend parts will be cut out using CNC laser, or CNC Plasma cutting machines. Sometimes we produce the nc programs ourselves or we are required to produce the correct files for the laser / plasma department to program and cut out. Making the program to cut out the parts starts normally from a 2D dxf file at a scale of 1 : 1. This is the first part of the process that has to be correct. If you produce this dxf incorrectly the finished parts will be useless. Producing this at the right scale, 1 : 1 is different with different 3D cad applications, other problems can be caused by you working in different drawing units. If you are not doing the program, talk to the person who is to make sure you produce the dxf as required. Having a large quantity of wrongly cut parts is not a good thing
Alibre Design

Lobsterback Duct Bends Sheetmetal Method

lawrie
in Modeling
1 0 Beginner
This is the method I use to construct lobster back bends with sheet metal tools that I can produce flat patterns from, These flat patterns can then be used to produce files for CNC profile cutting machines. I have come across other ways of doing this using surfaces, thickened and turned into sheet metal parts. The software I am using is Alibre Design. As the version I have is low on surfacing tools I have found this a good way to model lobster back bends, which I have been involved with the design and manufacture for many years.
Alibre Design

Onshape Tutorial Exersice

Çağın Gergin @chagocad
in Modeling
11 0 Intermediate
Sometimes you will not have Solidworks or a similar program installed on your computer. And you may have to make a model immediately. In such situations, Onshape is great. The link to the modeling file from the sample technical drawing is given below. https://cad.onshape.com/documents/51b10db64d8c10d69e04f4da/w/b4cd4b090cea13100d679675/e/741f8ec43a660ff55252cd29
Onshape onshape modellig loft free extrude

How to add callouts/balloons to drawing in Alibre??

ALI ALDUBAISI
in Design & CAD
0 0 Beginner
Source: Alibre Design User Guide, page 440 https://www.alibre.com/assets/user-guide-12.pdf
Alibre Design drawings callouts ballons

How to change measurement units in Onshape?

Yash Bhaskar
in Modeling
1 0 Beginner
Video tutorial to learn how to change units in Onshape.
Onshape units onshape

Introducción a Onshape

Jose L Perez
in Modeling
0 0 Beginner
Introduccion a Onshape, En este video vemos la página de documentos de onshape y le damos un vistazo a la interface. Vemos las diferentes secciones como la barra de menú, barra de herramientas, administrador de comandos entre otras. Puedes visitar nuestro blog en http://mitutordigital.com/ También nos puedes seguir en Instagram para ver lo nuevo que estamos trabajando https://www.instagram.com/mitutordigi... O en nuestro Facebook: https://www.facebook.com/mitutordigital/
Onshape cad digital tutor mi 3d diseno introducciononshape onshape

Alibre Design - How to Drive a Part From a Layout Sketch

lawrie
in Modeling
0 0 Intermediate
In this tutorial I will use a 2D sketch of the layout of a fan scroll to generate a 3D sheetmetal part using Alibre Design Software. When producing a range of centifugal fans the performance of each particular fan in the range is governed by equations called the "fan laws". Once the actual performance of one fan in the range has been established the performance of all other sizes can be predicted by these laws. This makes producing a complete range of a particular type of fan an ideal task for a parametric 3D approach to produce the drawings and other details ready for manufacture. The main dimensions of our fan are based off the diameter of the rotor.
Alibre Design

Anyone have "complex" Loft examples?

Christopher Owens
in Design & CAD
0 0 Intermediate
Thanks Tajusyed. Here is one I tried and it worked!
Onshape loft

Onshape Exercise 5

Tigin Thomas Geevarghese
in Design & CAD
2 1 Beginner
Beginner's exercise videos in Onshape.
Onshape 3d tutorial exercise design onshape

Modeling Twisted 25 X 25 Square Bar

lawrie
in Modeling
1 0 Beginner
Modeling a twisted 25mm x 25mm square bar with Alibre Design software. The model is made using lofted sketches, and as this feature tool is common to many software packages, the basic method should work with other software.
Alibre Design

Onshape Exercise 6

Tigin Thomas Geevarghese
in Design & CAD
2 1 Beginner
Beginner's exercise videos in Onshape.
Onshape 3d tutorial glass wine exercise design onshape

Basic Steps to Model Anchor Bracket from 6mm Plate

lawrie
in Modeling
0 0 Beginner
This is the basic steps to model a version of anchor bracket manufactured from 6mm thk. mild steel plate. The software I have used is Alibre Design. The same basic approach would be taken using Solid Works, Solid Edge. or Inventor, with small differences due to the basic sheetmetal being a little bit different. My preference for making the pressed version of this part is a laser cut profile pressed into shape is a very simple way to make this. This is a good way to make a few or many of this part. The first step is to select a starting plane and sketch this basic shape. The construction lines are a guide. As I am allowing for thickness of material and radius of bends, I have offset the actual profile by 12mm
Alibre Design

Model Cast & Machine

lawrie
in Modeling
0 0 Beginner
Often we make a model of component that are cast and machined to finish. This is an example of a simple cast iron flange that will also be machined. I have used Alibre Design but the same approach will work with any of the main 3D products. By using configurations we have a model that does both for producing the pattern for casting and also details for machining.
Alibre Design

volleyball in Onshape

Jens Nielsen
in Modeling
4 0 Intermediate
I wanted to get to know Onshape better and had a look at the split, transform and pattern command. I repeated this in SolidWorks and it is the same workflow.
Onshape volleyball

Belt Roller Assembly

Tigin Thomas Geevarghese
in Design & CAD
1 1 Beginner
A belt roller assembly in Onshape for beginners.
Onshape cad design onshape assembly
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The Computer-Aided Design ("CAD") files and all associated content posted to this website are created, uploaded, managed and owned by third-party users. Each CAD and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or real-world item, product, or good it may purport to portray.