DFM Tip: Quickly Design CNC-Machable Parts
There are a lot of great tricks to designing your parts to make them easy to machine. In addition to CNC machining being one of the most popular manufacturing processes offered by Turbo, a part design that is ready for machining will also cost less than a part design that is not or poorly prepared.
At Turbo, we refer to an easy-to-machine part as a "DFM". Design for Manufacturability (DFM) is a part design philosophy that reduces machining errors, reduces part cost, and ensures parts are produced in a timely and efficient manner. Simply put, it's a design approach that enables engineers to always get the parts they want at the lowest possible price.
While an entire book could be written on the subject, we have a few tips to at least get you started.
clear two-dimensional
DFM starts with clear 2D three-view drawings. What makes it clear? It needs to provide all the details and information needed to manufacture the part, including:
l Material type
l Tolerance range
l Surface finish requirements
l Ordinary hole and threaded hole size
l Clear size
Sometimes, designs are particularly complex and require more detail. Ultra-tight tolerances, specific features - whatever it is, pay attention and explain it.
clear and understandable
Clear sizing doesn't happen by accident. All features of a part should be measured from a common point to ensure that each of its critical features is placed correctly. If a 3D part file is not measured from a common point, e.g. one feature is measured from the upper left corner and the other is measured from the upper right corner, tolerance "accumulation" may occur, causing the parts that make up the entire assembly Can no longer be assembled.
Reasonable tolerance
Tight tolerances exist for a reason, but engineers often specify tighter tolerances than are required for a particular part application. It is important to relax the tolerances as much as possible while still getting the desired part. Any measure of high precision will increase the price of the part almost exponentially. So if you don't need it, don't ask for it. You'll save time and cost, and increase the likelihood that parts will be delivered to you in high quality.
Designing parts that are easy to machine saves time and money and increases the likelihood that your parts will be delivered to you in high quality.
Preparation
Design parts using stock dimensions whenever possible. Not only does this reduce the amount of wasted material, but the stock size also reduces the machining time required to manufacture the part, as there is no need for bulk disassembly. Anything about CNC machined part design that saves you money as long as it reduces waste and saves time.
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