3 Recommendations for Revision Control Best Practice

In manufacturing, revision control is a topic that rarely creates issues because both manufacturers and engineers take it so seriously. But when best practices break down even in small ways, they can create risk for everyone involved.

At Focused on Machining, we have strong systems in place to catch revision issues before they reach the shop floor. Even so, we have a few recommendations for revision control best practices to keep the manufacturing process clear from the beginning.

1. Don’t Restart at Rev A for an Existing Part Number

This is a rare issue, but it’s one we’ve seen happen after acquisitions or rebrands. A new team may inherit an existing part number and want to treat the current design as its new baseline. To them, restarting at Rev A is logical.

We understand the idea, but from a manufacturer’s point of view, that creates serious risk. If we have already made that same part number through Rev A, Rev B, Rev C, and beyond, our ERP system already has those revisions in its history. The current revision may be Rev J or Rev N, while the previous versions are archived. If a customer sends the same part number back to Rev A, there are now two different Rev A versions connected to the same part number.

We have extensive safeguards in place to prevent rev control issues, but this still creates an avoidable risk of confusion. If an order is entered against the incorrect Rev A, the incorrect part could be manufactured and delivered before anyone realizes the issue. At that point, both sides have lost time and money.

2. Be Clear With Your Manufacturing Partner About What Changed in a New Revision

When you send us a new revision, it’s helpful to identify specifically what has changed from the previous version. We are able to compare prints and work through the differences, but that process takes time. We may have to review the print callout by callout to be sure we didn’t miss anything.

A simple summary can make a major difference. When you give us context, we can quote the revision faster and plan the work more efficiently. Without it, we may need to treat the job almost like a brand-new part because we can’t afford to assume anything remains unchanged.

3. Treat Every Change as a New Revision

Even small changes should be controlled through a new revision. Customers may inform us that they slightly altered the hole size but didn’t change the rev. That change may seem minor, but it can affect tooling, setup, inspection, and the way the job is processed. If the print still says Rev A, but the part is no longer the same Rev A we made before, the risk of a mix-up increases.

This most commonly occurs with notes on the print. Even when the geometry does not change, updates to the notes should still be handled as a new revision. A different finish, material requirement, inspection requirement, or outside process can affect what needs to happen after precision machining. The part will not be the same from a manufacturing standpoint.

If anything at all changes on the print, the safest thing to do is issue a new revision.

Good Revision Control Protects Your Timeline

Strong revision control allows us to quote faster and deliver the correct parts on schedule. Our ERP system and review processes help us catch many potential issues, but following best practices can also help prevent any confusion.

If you’re updating an existing part and creating a new revision, talk to our Colorado machine shop about how we can help!

Why Defense Primes Should Still Look For CMMC Level 2 Suppliers

By Justin Quinn, President and Owner of Focused on Machining

A buyer from a large defense prime recently reached out to us at Focused on Machining. He was looking for a new defense supplier that could take on programs that require CMMC Level 2 compliance. 

We were happy to talk to him about his program and provide a quote. We are currently 95% complete with our CMMC Level 2 preparation, with a clear Plan of Action and Milestones (POA&M) in place.

But that conversation made us realize something: a major challenge is on the way across the defense manufacturing supply chain. The defense industrial base is under pressure to move faster than ever; at the same time, CMMC requirements may soon be phased into DoD contracts, even as the next phase of implementation is under review.

This combination could create real timeline issues for primes and suppliers that wait too long to act.

The Potential CMMC Supply Chain Crunch

The buyer told us that much of his recent time has been spent searching for CMMC Level 2 suppliers. Historically, his company had a large supplier base and could choose from a wide range of capable shops. 

But with CMMC requirements continuing to evolve, that flexibility is beginning to shrink. And this change is happening against a broader push across the defense industrial base to strengthen supply chains and deliver critical capabilities at greater speed and scale.

Many of the suppliers this buyer currently works with are talented small shops that have supported defense work for years. But some haven’t looked deeply into CMMC, while many others intend to be compliant eventually but have not taken meaningful steps yet. 

At this point, the next phase in implementation could bring CMMC Level 2 third-party assessment requirements into the award process. Even with the timeline paused, it’s risky to wait; suppliers that have not started may still be looking at a year or more of work before they are truly ready.

The buyer told us he was reaching out now to get ahead of this potential issue. He saw that we had experience with primes along with our CMMC Level 2 self-assessment, and wanted to add us as a partner before he lost other suppliers and programs experienced disruptions. 

What Defense Suppliers and Machine Shops Should Do Now

At this point, even after the recent pause, I do think it’s incumbent upon suppliers to start taking concrete steps. CMMC is a serious commitment, and I understand why many small shops have been cautious. It requires time, planning, outside support, new processes, and ongoing expenses.

I also understand the financial concern. CMMC is not inexpensive, and the recurring costs are real. But in our experience, the investment did not happen all at once. The process unfolded over time, with expenses spread across multiple phases. That made it possible to manage the work piece by piece instead of treating it as one massive project.

There are also resources available from the government and from people in the industry who have already gone through the process. I have shared some of what I learned along the way in my previous articles, and I’m always happy to talk with other shops trying to understand what comes next.

What Defense Primes Should Do Now

Primes, above all, should not wait until requirements are clarified again to evaluate their supplier base.

Many suppliers may not fully understand how much work is involved in becoming CMMC Level 2 ready. If a shop isn’t already well down the road, they may not be ready in time.

The best step is to begin adding new suppliers now. Some of your existing suppliers may eventually complete the process, and primes may be able to move work back to them later. But to avoid disruption, it is better to identify CMMC-ready manufacturing partners before a program is at risk.

Where Focused on Machining Stands Today

As of July 2026, we are:

• 95% complete with our CMMC Level 2 preparation. 

• Working toward full CMMC Level 2 certification this year.

• Following a clear Plan of Action and Milestones (POA&M), with remaining items scheduled for completion within the next 30 days. 

• Scheduled for our audit in early fall 2026.

Let’s Talk About Your CMMC Project

When I served in the Air Force as an aircraft mechanic, I would sometimes look at the parts I was installing and think about the path they took to get to me. I wondered what the markings and numbers meant and where the parts came from. Eventually, that curiosity helped lead me into manufacturing.

Because of that history, defense work is personal to me. As a defense supplier and service-disabled veteran-owned small business, I feel a patriotic obligation to take the responsibilities of CMMC seriously. I’m proud of the work we have done to prepare. 

And I also want to do my part to make sure the broader defense supply base stays strong. If you are a shop trying to navigate CMMC, please reach out, because I’m happy to talk. And if you are a prime looking for manufacturing partners who can meet CMMC Level 2 requirements, let’s discuss your program.

Understanding Lead Times: The Factors Customers Can Help Control

At Focused on Machining, customers sometimes approach us with tight timelines, and they’re looking to find out how quickly a project can move forward. We do everything we can to support aggressive schedules, but between our own capacity and outside processes, lead times can depend on a variety of changing factors.

That’s why reducing lead times starts with understanding what the machine shop can directly control, what depends on outside factors, and what customers can do to help prevent delays. When all sides understand these factors, projects can move faster.

What the Manufacturer Directly Controls

The steps we control most directly are the ones that happen under our own roof. These include precision machining, inspection, hardware installation, and other in-house operations required to complete the part.

Because these processes are part of our daily workflow, we can plan for them carefully and adjust schedules when needed. Our ERP system plays an important role in that process by tracking jobs in detail and planning capacity. We can make the best use of the time and resources available to us.

Material acquisition is another area where we usually have a strong degree of control. In many cases, standard materials are readily available, and proper planning on our end allows us to source them quickly. There are exceptions, of course. Specialty materials or short supply conditions can affect timing. But under normal conditions, material procurement is typically a manageable part of the schedule.

Where Customer Requirements Can Slow Down Projects

From a customer perspective, it can be most helpful to focus on factors you control that can influence lead time. Two factors we’ve recently seen have been approved supplier lists and source inspections.

Approved Supplier Lists

Approved supplier lists can be a major factor because they limit the options available for materials, inspection, and outside processing. For example, one customer recently needed a material that was ultrasonically inspected. The material we procured had already been ultrasonically inspected from a mill, but that mill was not on the customer’s approved supplier list, so it had to be reinspected before production began.

Approved suppliers can also delay finishing or post-processing. If a project requires a specific approved supplier rather than any qualified supplier that meets the right standard, that vendor’s capacity and location can add to lead time.

When possible, we try to help primes expand their approved supplier lists to prevent issues like these from affecting their schedules.

Source Inspections

Source inspection can also add time at the end of a project. Even after parts are machined and inspected, some customers require us to submit a data package and wait for their source inspector to review or release the shipment. If the inspector has several days to respond, that step can add nearly a week once paperwork, review, packaging, and shipment are all considered.

The Best Way to Save Time: “Overprovide” Details at the Start

The fastest way to save time on a project is to provide as many details as possible about your project when you’re first submitting your quote. Print, model, and quantity are an essential start, but more information can help us quote more quickly and plan accurately from the start.

For example, even if you tell us you need 200 parts, we need to know what that will entail. Is that an urgent one-time delivery, or a three-year quantity that might be better suited to contract manufacturing services? A production schedule allows us to understand whether the project fits our capacity, and it also helps us determine if we can find creative ways to support your requirements. 

Other factors that can provide helpful context:

• Are these parts currently being made by an existing supplier? 

• Is there a first article inspection requirement before production can begin? 

• Is the part coming to us after another process, such as 3D printing, casting, or outside fabrication? 

• Have you already learned something from previous production runs that we should know?

These allow us to understand your priorities. But without you offering them upfront, a project that could move quickly may require several follow-up conversations before we know how to proceed.

Where Outside Processes Affect Your Timeline

Some project steps fall somewhere in the middle. Outside processes such as plating, coating, heat treating, passivation, painting, or other finishing services, for instance, do not fall directly under our control.

Many projects are sent to outside vendors we choose from our trusted network, and we understand that their performance reflects on us. Even so, we cannot fully control another company’s internal schedule. If a finishing vendor is already at capacity, that can extend the overall lead time, even if the machining itself is completed quickly.

In some cases, expediting an outside process may help. However, we are cautious about recommending expedites for certain operations, especially complex plating or finishing work that requires masking. Rushing those steps can increase the risk of errors. If a part has to be reworked, the project may lose more time than the expedite would have saved.

Share Your Project Information Today

We always want to help customers move as fast as they need to, and complete information allows us to support your project in the best way possible. The more information you provide at the RFQ stage, the faster we can determine the best path forward.

Request a quote today to get your next project started!

Lights-Out 5-Axis Machining for Complex Defense Parts

At Focused on Machining, we speak extensively with defense primes through project collaborations, as well as at trade shows and other industry events. In those conversations and in our discussions with other defense manufacturers, we hear a common theme: the defense industrial base is under pressure to move faster.

No single company can solve that challenge alone, but we take our role seriously. That’s one reason we’ve invested in advanced equipment and automation to help increase our lights-out capacity for complex defense parts.

5-Axis Machining to Reduce Timelines

We have long embraced automation, but we never stop improving to turn your parts around faster. One clear illustration is a complex antenna component we make for a defense customer. The part has positional tolerances of less than a thousandth of an inch, with certain feature locations held to within seven ten-thousandths of an inch. Precision is central to the part’s performance.  

When we first began manufacturing this part, we ran it on one of our horizontal mills. We met required specifications, but the process was slower than we wanted it to be. It required careful fixturing, and because tolerances were so tight, we had to manually indicate certain features to confirm accuracy. These manual steps added to timelines.

Today, we manufacture the same part on our 5-axis mill, improving cycle times. Even more significantly, the 5-axis machine is reliable enough to run this complex part lights out, reducing production timelines. 

Repeatability Is Critical for Speed in Defense Machining

Our 5-axis equipment is highly accurate and robust, and its palletized setup allows the machine to be fed continuously, even for tight tolerance machining. When we first transitioned the antenna component to the 5-axis mill, we checked parts frequently to make sure the machine was holding tolerance throughout the run. After the first batch, our quality team found that the final part we produced was just as good as the first.

That kind of repeatability is essential to defense machining. It’s what allows us to run lights-out at night with total confidence in the results. We can take advantage of more hours of production, while maintaining fewer setups and better access to complex part features. 

And now, we are ramping into even more complex 5-axis work. One part currently in production has a cycle time of nearly 22 hours, and we plan to run it unattended around the clock.

Building Reliable Processes for Lights-Out Production

Lights-out precision machining requires confidence in both your equipment and your processes. Our most senior programmer handles our 5-axis projects, and he brings years of programming and machining knowledge.

There is one central principle in our lights-out programming: the goal is stable, reliable processes instead of pure speed. We need quality parts without intervention, and in many cases that requires a more conservative approach rather than aiming for aggressive cycle times. Our programmer pays close attention to tool life, workholding, chip evacuation, and controlled cuts. 

We’ll Help Defense Customers Move Faster

Primes need a manufacturing partner that can produce complex parts while still moving quickly. Focused on Machining offers lights-out machining to help increase throughput and reduce timelines for your defense parts.

Request a quote today to find out how we can support your challenging program!

How Material Choice Affects Machining Time and Part Cost

At Focused on Machining, we work with a wide range of materials, from aluminum to Inconel to A286. But one thing we always make clear to customers is that these materials differ not only in their performance, but also in their machinability. Material choice can directly impact factors like cycle time and tooling, ultimately driving part cost. 

Learn how the machining process changes, and why that leads to higher prices.

Why Material Choice Affects Machining Time

On the machinability spectrum, aluminum is relatively easy to cut, while Inconel machining is much more demanding. Aluminum allows for aggressive machining, but Inconel does not.

This is reflected in quotes, as machine shop pricing is closely tied to time. Longer machining time means higher cost. At Focused on Machining, price is heavily tied to production hours and shop rate. But other material factors do add to price, as well; for instance, materials like Inconel are significantly more expensive, while specialized tools may be needed because tool wear can be more severe.

Comparing Aluminum and Inconel on the Same Part

We have never machined the exact same part in both aluminum and Inconel, so a perfect one-to-one comparison is difficult. But a hypothetical example still helps illustrate the difference.

For this hypothetical, we considered machining a part that is 4” x 4” x 1” with a 0.5” end mill to rough it.

With aluminum, especially 6000 series aluminum, we can typically use tooling designed for high material removal rates. For a hypothetical part, that might mean a half-inch three-flute tool taking deep cuts at high RPMs and aggressive stepovers. Because aluminum is comparatively soft and easy to machine, we can remove material quickly and efficiently.

Inconel requires a much different approach. For the same part made of Inconel, we would likely use a five-flute or seven-flute tool with much more conservative cutting parameters. The depth of cut would be shallower and RPMs would be reduced. Additionally, heat control becomes critical with Inconel because of the potential for work hardening. 

Quantifying the Difference: A 17x Change

In qualitative terms, aluminum lets you cut fast, while Inconel forces you to slow down. But quantitatively, a simple back-of-the-envelope calculation suggests that machining the part from Inconel 718 would take roughly 17 times longer than machining the same part in 6061 aluminum. 

That’s just an estimate, but it certainly aligns with our general experience. A very simple part like this that might take minutes in aluminum could take close to an hour in Inconel. And that difference becomes especially important in our production machining services, when the gap multiplies significantly across hundreds or thousands of pieces. 

Experience Is Critical With Difficult Materials

When a project involves Inconel, A286, or other difficult materials, experience matters. An expert shop understands how to move as fast as possible without risking scrap and rework. 

At our precision machine shop, we have years of experience machining challenging materials. We understand the risks, and we know the best techniques to be as efficient as possible for our customers.

If you’re looking for Inconel, A286, or titanium machining, let’s discuss the best approach for your project. Contact us today!

A Case Study in 5-Axis Machining: Reducing Setups and Improving Lead Times

At Focused on Machining, our 5-axis machining is now running at full speed. As our team has gained experience with the new equipment, we have become more efficient in our manufacturing for 5-axis parts. 

5-axis machining is often associated with complex geometries, and it does allow us to machine challenging contours and other difficult features more effectively than many traditional setups. But in our shop, customers have also seen major benefits in speed, as well.

One recent manifold project is a strong example of how 5-axis machining can improve efficiency and help keep demanding jobs on schedule. 

A Complex Manifold With Tight Requirements

Focused on Machining has produced complex manifolds for years, and this recent project was an excellent example of the precision machining work we often do. The part was an aluminum block measuring roughly 2 inches by 2 inches by 12 inches, with 17 ports.

This manifold was part of our aerospace machining work for a customer. It was designed for fuel lines in a rocket engine, so positional accuracy was critical and the tolerance requirements on the holes were extremely tight. In fact, inspection did not stop at the physical surface of the part. We also had to project a feature location four inches out from the part and verify that it still met the required positional tolerance at that distance.

Before and After: Reduced Setups, Greater Efficiency

We originally quoted and planned this part before our 5-axis machine arrived, and at that point, we planned for the part on our existing equipment. Ultimately, though, we were able to machine it on our new 5-axis. That gives us a clear before-and-after comparison:

• If we had machined this manifold on our horizontal machine, it would have required four operations. 

• On a vertical machine, it would have taken at least seven operations. 

• On our 5-axis machine, we completed it in just two operations.

How Reduced Operations Benefit Customers

For those who aren’t in a machine shop every day, it’s worth explaining what these terms mean. An “operation” is essentially a separate setup or machining step. Each time a part has to be repositioned or moved so a different side or feature can be machined, that adds another operation.

Fewer operations benefit customers in multiple ways. First, every time a part is handled in a setup, it introduces the opportunity for error. Second, each additional setup adds labor and production time because the part must be reoriented and verified before machining continues. Third, longer cycle times within fewer setups can create opportunities for unattended lights-out machining, which can significantly improve throughput.

Lights-Out Manufacturing Led to Scheduling Flexibility

This job also involved substantial outside processing that we coordinated on the customer’s behalf, including chem film and precision cleaning. Because of those requirements, we had very little room for delay during machining.

Fortunately, the reduced number of setups made a major difference. Cycle times were nearly three hours, and the 5-axis machine is palletized, which allowed us to load multiple parts at once. Those factors let us run these parts for approximately six hours unattended at night. As a result, we kept the project moving and met its deadline.

Always Getting Better, Faster, and More Cost-Efficient

Our experience with 5-axis machining is leading to consistent improvements in efficiency. We’re already seeing shorter production times, and we expect the trend to continue. And over time, we know increased efficiency will help reduce costs for customers in our contract manufacturing services.

If you have a part that could benefit from 5-axis machining, let’s discuss. Whether the priority is part complexity or shorter lead times, Focused on Machining is ready to help. Contact us today!