Proper Method to Produce Lobster-back Duct Bends

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


3 1 Expert

Lobsterback Duct Bends Sheetmetal Method

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.


1 0 Beginner

Parametric Arty Glass Model

1 1 Beginner
A recent question asked on GrabCad is the inspiration for this quick tutorial. A Grabcad member. His task is tp produce a model of a existing glass tumbler. The basic model consists of two triangular profiles, the base profile separated from the top profile and rotated 180 deg. from the base profile. If you have the original in front of you it is possible to take a few measurements, but a big part of getting the final that you are happy with will probably involve a bit of tweaking to get something that looks right. This concept can be expanded as by building a good robust model, by adjusting values in the function editor, one of the many useful tools available in Alibre Design software, many different versions can be produced with little effort. Alibre Design is great product available for a price well bellow more fancied products like Solid Works and Inventor. For small time use Solid Works and Inventor are too expensive for the possibility of paying there way, which is why there are many pirated copies being used commercially. Alibre Design enables me to own an excellent tool that has paid its way.

Modeling Twisted 25 X 25 Square Bar

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 - How to Drive a Part From a Layout Sketch

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.

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

0 0 Beginner
Source: Alibre Design User Guide, page 440 https://www.alibre.com/assets/user-guide-12.pdf

Basic Steps to Model Anchor Bracket from 6mm Plate

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


0 0 Expert
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Modeling a Clockwork Type Spring with Alibre Design

0 0 Beginner
Alibre Design is a low cost 3D modeling and 2D drafting application that is functionally similar to Solid Works and Inventor, but at a fraction of the price. It does not come with surfacing tools, FEM, or animation, but if I had a requirement for these functions I can purchase them as ad-dons. As a small time, semi- retired CAD contractor if I purchased Solid Works or Inventor I would not make any return on my investment, I would need to be unethical and pirate these software's or be prepared to never make a profit but only a loss. Alibre Design, for the most part is quite like using Solid Works or inventor but had a couple of features not found in these two applications. The method I use in this tutorial is one of these features.

Model Cast & Machine

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.


0 2 Beginner