If you’ve partnered with a precision machining company to make assemblies or subassemblies, you might already know that mating parts can present tolerance stacking challenges.

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While many precision machine shops have the engineering and manufacturing expertise to prevent tolerance stacking issues from impacting the functionality of an assembly or subassembly, there are best practices customers can follow when designing mating parts.

For our purposes in this piece, let’s talk about tolerance stackups that occur with mating parts. Before manufacturing begins, the tolerances for each part must be calculated together and considered collectively—not just individually—to ensure the assembly will meet all critical specifications.

The fourth letter of general turning insert nomenclature tells us about the turning insert hole shape and chip breaker type.

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If both parts, A and B, were made to measure 0.90″ tall, the assembly would measure 1.80″ tall instead of 2.0″ tall. In other words, the completed assembly would be out of print and would not pass inspection.

Yes of course, Insert DCMT comes in variety of cutting radius to suit every ones needs. I like DCMT 11T308 and try to use it where ever possible because of…

Carefully select insert geometry, insert grade, insert shape (nose angle), insert size, nose radius and entering (lead) angle, to achieve good chip control and ...

A stackup study allows you to look at tolerances at their extreme dimensions to identify potential problems. You can see how the assembly will turn out if the mating parts’ tolerances are set to the smallest and largest variances or if each part is at one extreme.

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Over-tolerancing adds complexity to the design, directly contributing to increased costs and lead times. This approach isn’t always successful at preventing tolerance stacking issues in the first place—and in some cases, it can negatively affect the functionality of the assembly or subassembly.

When manufacturing an assembly or subassembly, your precision machining partner needs to know which surfaces are considered critical and which can have some variance and still be functional.

Let’s say we’re making an assembly that must measure 2.0″ tall to function correctly. That assembly is comprised of two mating parts: part A and part B. Per the print, both A and B must be 1.0″ tall, and each has a +/- 0.1″ tolerance.

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When mating parts rub together or make firm contact against each other, it’s best to have a smooth surface with a smaller Ra. If a part requires wet paint or powder coating, a rough surface is preferred because it provides more surface area for the finish to adhere to.

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Be sure to tell your precision machining partner that you’re requesting a quote for a mating part(s). Here’s everything you should plan to communicate:

If we were manufacturing these lids, we would need sufficient information about the critical surface (e.g., surface finish Ra, tolerances, application) to ensure functionality.

CCMTInsert

The IDEAL team is often called on to fabricate custom piles and brackets to ... All of our standard Helical Piles, Helical Anchors, and associated ...

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Fanuc G76 Thread Cycle for Dummies explains Fanuc G76 threading cycle briefly. Fanuc G76 gives cnc machinist full control over thread turning. Fanuc G76 threading cycle has multiple parameters but the same…

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The best way to ensure mating parts are functional for end users is to rely on the same contract manufacturing company to machine both mating parts and complete the assembly. This approach streamlines the entire manufacturing process by giving the manufacturer full visibility into the project.

Here are cnc tool selection tips from a cnc machinist which will help you in cnc tool selection for your components in cnc machine workshop. Tool Selection for cnc machining…

The first letter in general turning insert nomenclature tells us about the general turning insert shape, turning inserts shape codes are like C, D, K, R, S, T, V, W. Most of these codes surely express the turning insert shape like

In cnc lathe machine workshop undoubtedly you will see most of the component assignments with some kind of threading like internal threading, external threading, tapping etc. Of course threading on a…

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The Click-Change tool holder allows insert changes in just 5 seconds with the push of a button. Its cam-actuated lever provides a uniform insert clamping pressure of 8,000 psi. You are working…

Not every modeling program has this capability, so it’s not a guaranteed solution, but it is an excellent first step in mitigating potential problems.

Kyocera is a leading global manufacturer of industrial cutting tools with a diversified product line for Turning Milling Drilling Threading Grooving Boring ContentsKyocera General Catalog 2011 – 2012 (English Version)Contents Kyocera General…

Turning inserts types

Sandvik Coromant Online Product Catalogue is just not an online tooling and insert related data but it is more than that. Sandvik Coromant Online Catalogue website also has Free Feed,…

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Some precision machining shops, including Reata, have a standard “as machined” finish that might be sufficient for a customer’s assembly or subassembly. Still, understanding the part’s required surface finish is critical.

Instead of making every tolerance extremely tight, we recommend determining how the tolerances stack up against each other.

Yesterday I posted about General Turning Insert Nomenclature . I have used multiple turning insert in the cnc workshop. With the passage of time in the cnc workshop the turning insert…

Today I am going to explain the threading insert nomenclature which are used for threading on cnc machines. Of course there are plenty of different types of threading inserts and the…

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When designing mating parts, engineers have a tendency to make tolerances tighter than necessary to avoid tolerance stacking problems, but this “solution” often does more harm than good.

Kyocera Cutting Tools and Inserts Catalog can be freely downloaded from Kyocera website http://americas.kyocera.com/kicc/cuttingtools/catalog.html. Following Kyocera catalogs are available, 2013 Milling Catalog 2012-2013 Turning Catalog 2013 Drilling Catalog You might…

For example, picture a traveling coffee cup with a friction-fit, “pop-on” plastic lid. The diameter at the top of the lid can have some variance, and the lid will still be functional. The diameter at the bottom of the lid is the critical surface, as it contains a groove for a rubber o-ring to seal the coffee cup and prevent it from leaking.

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The Seco MDT (Multi Directional Turning) system uses single toolholder and insert for turning, profiling, and grooving in both axial and radial directions. For complex components with many grooves and profiles,…

It’s best to call out if mating parts will slide against one another, make firm contact, or will have wet paint or powder coating to help us understand what surface finish is required.

These are the turning insert tolerances in different insert sizes, like the tolerance in turning insert length, height etc. I personally think that they are not of any use for a cnc machinist, because theses tolerances are minor.

CNC machines are used for continuous and accurate job production. So to keep this a continuous process some sophisticated tooling is used like tools with the Inserts. The machining with…

Carbide inserts are designed in many different shapes/sizes to work their best in a variety of materials while machining, based on their insert strength. The basic shapes listed from strongest to…

A simple cnc lathe programming example. This cnc programming example will show how to program contours like chamfer taper grooves and arc. This cnc program will use two tools for…

VBMTInsert

General turning inserts come in variety of shapes and sizes. One thing is important to remember and understand is that every turning insert has a nomenclature associated with it. These general turning inserts nomenclature tells us lot about these general turning inserts.The turning inserts nomenclature is a list of some letters and numbers, but lot more data is hidden inside them.

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The most popular turning insert in the industry is the 80 degree diamond (CNMG insert). Known for its balance of versatility and edge strength it is usually the first choice…

The following image is taken from Sandvik Coromant Turning Tools – General Turning Catalogue. The chart given below shows Feed & Cut Depth for Finish to Rough Machining Sandvik Coromant…

Tool-wear is a gradual process, where the worn rate depends on the workpiece and tool materials, the cutting fluids, and the cutting parameters, among others.

As a result, you’re assured a fully functioning assembly and a much more convenient experience: managing one supplier relationship and inspecting one completed assembly. Request a quote from Reata, and let us be your one-stop contract manufacturing partner.

We could manufacture parts A and B to measure 1.10,” 1.0,” or 0.90,” and each part—individually—would technically be “in print” and pass inspection. However, once mated, the assembled part’s measurement might be wrong.

Following cnc programming code shows the use of G72 bolt hole along an angle. As the names states G72 G-code makes it very easy to drill/bore/tap evenly spaced hole along…