Startup interview: CAD software for designing new kind of baby stroller by Prambag team

Can you tell us about your team? What do you do? We are an international team with a diverse set of skills and experience in design, engineering and business. We have a common passion to develop tangible solutions to customer problems and that’s exactly what we are doing in our startup PramBag. Our startup’s mission is to empower parents to explore the world with their baby. We are based in Helsinki, Finland and our first product is a baby stroller, that transforms quickly and easily into a baby-carrying backpack. All while the baby is inside safely and comfortably. In the industry you are working in, what do you think is the biggest opportunity? We are aiming to disrupt the baby pram and stroller industry, which …

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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 …

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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 …

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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 …

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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 …

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