Approved Machining

Approved Machining Approved Machining is a manufacturer of custom precision prototype & low production machined parts.

Brass could coast on looks alone.It chooses not to.Behind the natural golden surface is a material that machines easily,...
09/02/2026

Brass could coast on looks alone.

It chooses not to.

Behind the natural golden surface is a material that machines easily, resists corrosion, conducts heat and electricity, and shapes cleanly into whatever the job needs.

That combination takes brass from light fixtures and other visible parts to gears, fittings, and electrical components.

It would be easier to resent if it weren’t so useful.

Learn more about machining brass: https://www.approvedmachining.com/cnc-machining-materials/custom-brass-machined-parts

September 1. Summer is winding down, schedules are filling up, and everyone is trying to get back on track.Excellent tim...
09/01/2026

September 1. Summer is winding down, schedules are filling up, and everyone is trying to get back on track.

Excellent timing for a machined rail.

Despite the name, custom machined rails aren't necessarily headed anywhere near a train. They're made for bracket systems, switches, fixtures, engines, electrical equipment, weather-shielding applications, and plenty of other highly specific jobs.

They can also be machined from metals or plastics, with the material and geometry determined by what the rail needs to do.

Have a custom rail in your plans? Send us the drawing: https://www.approvedmachining.com/request-for-quote



Related: New Hampshire Manufacturing Extension Partnership - NHMEP

There's "we need a prototype."Then there's "the design review is next week, and we need a physical part to present asap....
08/27/2026

There's "we need a prototype."

Then there's "the design review is next week, and we need a physical part to present asap."

We're set up for both.

We specialize in quantity-one prototype work, with expedites always available and completed parts delivered in days. Bring us a hand sketch, a detailed print, or a CAD model and we'll turn it into a real part.

Dedicated equipment for larger-volume jobs also lets us keep prototype and production work moving simultaneously.

How soon do you need it? https://www.approvedmachining.com/request-for-quote

Some combinations look fine on paper.Then you put them together and realize you've created the metallurgical equivalent ...
08/26/2026

Some combinations look fine on paper.

Then you put them together and realize you've created the metallurgical equivalent of two siblings sharing one armrest for four hours.

That’s galvanic corrosion.

When dissimilar metals are paired in the presence of moisture or conductivity, one material can corrode faster than expected.

So when you’re choosing a corrosion-resistant material, don’t stop at the machined part. Look at the fasteners, inserts, bushings, pins, mating hardware, coatings, and the environment they’ll all share.

Here's everything that goes into speccing a part that resists corrosion: https://www.approvedmachining.com/blog/how-to-choose-the-right-corrosion-resistant-material-for-machined-parts



Related: Association for Materials Protection and Performance

This little part looks like it should be guarding a very small castle.Instead, it's helping hold something more practica...
08/25/2026

This little part looks like it should be guarding a very small castle.

Instead, it's helping hold something more practical in place: a motor.

The geometry looks simple, but there isn't much room for "close enough" here. The base holes need to land cleanly, the threaded feature has to be right, and the upright has to sit exactly where the drawing puts it, because a mount only works if the motor ends up where it's supposed to.

It's a lot of responsibility for something that looks like it belongs near a tiny drawbridge.

Send us your drawing: https://www.approvedmachining.com/request-for-quote

Yesterday’s reminder: please do not treat machined parts like hot potatoes.Today’s follow-up: nobody wants a manufacturi...
08/20/2026

Yesterday’s reminder: please do not treat machined parts like hot potatoes.

Today’s follow-up: nobody wants a manufacturing scavenger hunt either.

When finishing is split across multiple vendors, the schedule can get blurry fast. A part may leave the machine shop, head out for plating or anodizing, wait for pickup, come back for another step, or sit longer than expected because one part of the process shifted and the rest of the schedule had to shift with it.

That’s where finishing coordination helps.

Approved Machining manages finishing through a vetted partner network, giving customers better visibility into where the parts are, what step comes next, and how the project is moving from machining to completion.

Because “somewhere between here and anodizing” is not a project status.

See how coordinated finishing helps keep your project moving: https://www.approvedmachining.com/blog/cnc-machined-part-finishing

Happy National Potato Day. 🥔In honor of the occasion, our team at Approved Machining has an important PSA for you: pleas...
08/19/2026

Happy National Potato Day. 🥔

In honor of the occasion, our team at Approved Machining has an important PSA for you: please don't play hot potato with your machined parts.

When a part still needs stress relief, plating, or another secondary process, passing it from shop to shop gets risky. Those steps can affect dimensions, finish quality, and final fit, which means a part that was in spec after machining can still run into problems by the time it’s finished.

That's why we coordinate finishing through a vetted partner network. We choose the right vendor, plan the order around how each step affects the part, and deliver it completed, with no handoffs for you to chase.

Less hot potato, more actual process control.

Learn more about our machining and finishing coordination: https://www.approvedmachining.com/blog/cnc-machined-part-finishing



Related: Products Finishing

Ask most machine shops about sheet metal and you'll get a list of other vendors to go vet.Ask us, and we'll point across...
08/18/2026

Ask most machine shops about sheet metal and you'll get a list of other vendors to go vet.

Ask us, and we'll point across the street.

Approved Sheet Metal is our sister company. It sits right next door under the same ownership, so when your project needs both machined and fabricated parts, the conversation stays a lot simpler.

Instead of tracking down a separate fab shop and trying to keep two vendors aligned, you already have support under the same umbrella. That can make a big difference when the machined part also needs a sheet metal enclosure, bracket, or panel to complete the job.

Here's how machining and fab work together: https://www.approvedmachining.com/sheet-metal-fabrication-services

Aluminum is popular for CNC machining for the same reason everyone likes the low-drama person on a group project.It show...
08/13/2026

Aluminum is popular for CNC machining for the same reason everyone likes the low-drama person on a group project.

It shows up, does the job, and doesn’t make the whole process harder than it needs to be.

Aluminum brings a lot to the table:

➡️ High strength-to-weight ratio
➡️ Natural corrosion resistance
➡️ Great heat dissipation (think heat sinks)
➡️ Excellent machinability

That last one, machinability, is where the savings hide.

Even when aluminum costs more than carbon steel as raw stock, it often machines faster. Based on our experience, carbon steel generally takes about 1.5 times longer to mill than aluminum, while stainless steel can take up to twice as long.

That machining time shows up in the final cost, especially as quantities increase.

Here’s why aluminum is one of the most requested materials we machine: https://www.approvedmachining.com/blog/aluminum-precision-machining



Related: The Aluminum Association

Parts can look perfectly innocent on their own and get fussy the second they have to fit with the rest of the assembly.T...
08/12/2026

Parts can look perfectly innocent on their own and get fussy the second they have to fit with the rest of the assembly.

That's why mating areas are worth thinking through before the prints are finalized.

A few details can make assembly go more smoothly:

➡️ Build in the right clearance for sliding, telescoping, or nested parts.
➡️ Use internal radii where one part seats into a pocket or other mating area.
➡️ Save very tight tolerances for the features that truly need them, like press-fit areas.

Because at some point, the parts have to stop looking good separately and actually go together.

Read more about CNC machined assemblies: https://www.approvedmachining.com/blog/cnc-machined-assemblies

Address

4 Security Drive
Hudson, NH
03051

Opening Hours

Monday 7am - 5pm
Tuesday 7am - 5pm
Wednesday 7am - 5pm
Thursday 7am - 5pm
Friday 7am - 5pm

Telephone

+16038831510

Website

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