Replace components in a machined assembly

Overview Some time before, I promised to look at the special techniques which help to replace components in assemblies with machining features applied to them. In this article I’ll describe them in detail. In complex products, machining after assembly is a typical scenario. On the other hand, it is often required to replace components in a CAD assembly. It is done in at least two major cases: A design change is required, which involves replacing components with their updated versions A new design is being created based on the old one, which requires replacing a number of components with different ones. Therefore, it is often needed to replace components which have modeling features applied to them at the assembly level. In NX it is not very …

Continue reading

How to model machining after assembly in NX

Introduction As I promised you before, my new article looks into tools that NX provides for modeling of machining after assembly. Thanks to the unified PRT file format, in NX there’s almost no difference between modeling at the part level and assembly level. The only difference is that at the part level we can directly modify bodies, while at the assembly level there’s no direct access to the bodies of components, and it must be provided first. In NX there are three ways to alter component and the assembly level, based on the following techniques: Body promotion Assembly Cut WAVE copy Each of these techniques has its own advantages, and also its own characteristics, which must be taken into account to avoid errors in the …

Continue reading

Improve drafting in NX CAD, part 2: responsive drawings

This entry is part 2 of 3 in the series Improve drafting in NX CAD

This entry is part 2 of 3 in the series Improve drafting in NX CADThis NX drafting-related tutorial shows you how to improve the of reusability of the drawings. It means that minimum efforts are required after a model is updated. If you take your time to make a parametric model for reuse, you also should consider spending some time for making responsive drawing. NX drafting tips and tricks. The recommendations I show here do not remove the necessity to check the drawing after an update is done. However, they can guarantee that dimensions would be always be correct and overall minimum adjustment is needed. 1. Position the views in the responsive manner. In case your model changes one of the main dimensions, your views could intersect with each other …

Continue reading

Improve drafting in NX CAD, part 1 introduction

This entry is part 1 of 3 in the series Improve drafting in NX CAD

This entry is part 1 of 3 in the series Improve drafting in NX CADThis article series describes various ways for improving your performance in NX drafting. Part 1 gives an overview of the functions, further posts will describe these functions in detail. Introduction to drafting efficiency. While the basics of the drafting application can be understood quite intuitively, there are some additional tools which can improve your productivity when creating a drawing. There are a tools which can standardize some common drafting procedures, and tools for making the drawing updatable (meaning minimum changes are needed when model changes). Reuse drafting objects. The reuse of components and features has a proven positive effect on modeling of parts and assemblies. In a similar way, this can be utilized in …

Continue reading

How to calculate assembly weight in NX in presence of WAVE-linked bodies

Overview Machining after assembly is a very frequent scenario in real-life manufacturing. In NX, there are two principal ways to apply modeling features to the assembly components: Promote bodies of components and apply features  directly to them, Make copies of bodies using WAVE linker and apply features to these copies. It is outside of the scope of this article to describe these two methods  as well as reasons to pick one or another (although I promise to soon publish an article addressing exactly that), we only have to accept that sometimes WAVE linking is the only option that designer has at his disposal when he needs to machine an assembly. Weight issue Along with certain advantages, use of WAVE-linked copies of bodies creates a significant …

Continue reading

Top-down modeling — how to exploit strongest features of NX CAD

Background Design engineer’s task is to describe geometry of the future product. For a long time, this task could only be accomplished by the means of the hand-made 2D drawing. The drawing created in this way is an approximation of the geometry which exists in the design engineer’s imagination. Thus, the exact shape of the geometry if finalised only during the manufacturing process. Until recently, the traditional 2D drafting technique was the only one available. As a result, design organisations developed a strong habit towards the limitations which derive from the manual drafting process. Limitation #1: Incompleteness Shape of components and their relative positions in assemblies can only be described by a limited number of views and sections on the 2D drawing. As the complexity of …

Continue reading

om3DCAD – free 3D CAD for Android, review and modeling example

Introduction. Om3DCAD  is free CAD application for 3D modeling and CAD file conversion for Android. It has some very basic (non-parametric) modeling tools and, it imports/exports files in multiple formats (STEP, IGES, STL, OBJ). Here I would share my first experience with the tool and will describe a way to make a simple model. Modeling example. The aim is to model a protection cover for a plug (eurosocket type C). The idea came after such plug got broken. During the testing I would check STEP import and STL export (for the following 3D printing). It will include a test of few modeling features. Tested on Nexus 7. The following video can be used as a fast start instruction for the system. Conclusion. Overall, Om3DCAD is …

Continue reading