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CNC Boring Services
Are you looking for perfect holes in your parts? CNC boring might be just what you need! At Istar Machining, we make holes that are super exact – just like drawing a perfect circle every time. We have the tools, skills, and machines to make your parts work better than ever.
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20+ Years
Istar Machining's years in the industry
300,000 square feet
The size of Istar Machining's factory
856 CNC machines
Our CNC equipment count
2000+ skilled workers
Istar's number of skilled machinists/operators
Best Materials for CNC Boring
Different materials are better for different jobs. Here’s what works best:
Aluminum Alloys
Stainless Steel
Tool Steels
Titanium
Nickel Superalloys (like Inconel)
Plastics & Composites
Aluminum Alloys
Aluminum is a star for boring. It’s light and cuts easy.
Good things about aluminum:
- Very light
- Cuts like butter (100% score)
- Not too costly
- Good for fast jobs
Types of aluminum:
- 6061: Good for most jobs
- 7075: Stronger for plane parts
Boeing made plane parts 30% faster by using good tools with aluminum.
For more info on aluminum, check out aluminum CNC milling.
Stainless Steel
Stainless steel does not rust easy. It’s good for wet places and body parts.
Good things about stainless steel:
- Does not rust much
- Looks nice and shiny
- Good for food and body things
Types of stainless steel:
- 304: Good for most jobs
- 316: Even better for not rusting
A medical company made surgery tools with a super smooth finish using stainless steel.
Learn more about CNC stainless steel for your jobs.
Tool Steels
Tool steels are very strong and tough.
Good things about tool steels:
- Very hard
- Can take big loads
- Good for making tools
Types of tool steels:
- AISI 4140: Good for big parts
- D2: Good for cutting tools
Ford made engine parts 18% cheaper by using the right speeds for boring tool steel.
Titanium
Titanium is strong but not too heavy. It’s good for planes and body parts.
Good things about titanium:
- Strong but light
- Does not rust
- Good for body parts
- Works in hot places
Airbus cut bad parts by 25% with high-pressure water when boring titanium.
For special jobs with titanium, visit titanium CNC machining.
Nickel Superalloys (like Inconel)
These special metals work in very hot places.
Good things about Inconel:
- Works when very hot
- Very strong
- Does not rust or break down
Not so good:
- Very hard to cut (only 15% score)
- Very costly ($95 per kg)
- Wears out tools fast (only 8 hours)
GE made jet engine parts last 200% longer by using special tools for Inconel.
Plastics & Composites
Plastics can be good for light parts that don’t need to be strong.
Good things about plastics:
- Very light
- Easy to cut (120% score)
- Can be clear
- Don’t conduct electricity
PEEK is a special plastic good for body parts.
Stryker saved 40% on costs by using PEEK for spine parts.
To learn about plastic options, see CNC plastic.
Istar Machining: CNC Boring Product Showcase
Industries We Help with CNC Boring
Our CNC boring service helps many different businesses make better products:
CNC Boring Equipment at Istar Machining
We invest in the best machines so your parts are always perfect:
- High-Speed Spindles (100–3,000 RPM for different materials)
- Powerful Motors (15–40 kW to cut through anything)
- Special Boring Bars (that don’t bend or vibrate)
- Tool Changers (12–24 tools ready to use)
- Computer Controls (that follow your design perfectly)
Technical Details About Our CNC Boring
For the engineers and quality folks, here are the specs:
- Maximum Bore Diameter: Can go up to 500mm (about 20 inches)
- Minimum Bore Diameter: As small as 10mm (less than 1/2 inch)
- Tolerance Capability: ±0.005mm to ±0.05mm (we can do super exact work)
- Surface Finish: From Ra 0.4μm (mirror-smooth) to 3.2μm (still very good)
- Depth-to-Diameter Ratio: Up to 10:1 standard, more with special tools
CNC Boring Services We Offer
Service Type | What It Does | Best For |
Precision Boring | Makes holes with exact sizes (±0.005mm) | Aerospace parts, medical devices |
Deep-Hole Boring | Creates long, straight holes | Hydraulic cylinders, gun barrels |
Counter-Boring | Makes wider openings at the start of holes | Bolt heads, washers |
Back-Boring | Works from the back side of parts | Hard-to-reach areas |
Trepanning | Cuts large holes while saving material | Big openings, saving material |
How CNC Boring Compares to Other Methods
Process | Good For | Limitations | When to Choose |
CNC Boring | Improving existing holes, high precision | Needs pre-existing hole | When accuracy is critical |
Drilling | Making new holes quickly | Less accurate than boring | For rough holes or starting points |
Reaming | Finishing holes to size | Limited material removal | When hole is close to final size |
EDM | Hard materials, odd shapes | Slower, more expensive | For hardened steel or complex shapes |
Why Choose Istar Machining for Your CNC Boring Needs?
We don’t just make holes – we make perfect holes! Here’s why customers pick us:
Super Exact Work
We can make holes with ±0.005mm precision - that's thinner than a human hair!
Smart Computers Do the Work
Our CNC machines work day and night without getting tired or making mistakes
Works with Many Materials
We can bore holes in metal, plastic, and more
Best Tools in the Business
We use special boring bars and cutting tools for perfect results
Solutions for Every Job
Whether it's for planes, cars, or medical tools - we've got you covered
Getting Started with Istar Machining's CNC Boring Services
Ready for perfect holes in your parts? Here’s how:
Send us your design
CAD files work best but drawings are fine too
Get a fast quote
We'll tell you the price and time needed
Approve production
We'll make your parts exactly to spec
Receive perfect parts
On time and ready to use
Contact Us for Your CNC Boring Needs
Ready to get started? Call us, email us, or visit our website. We’re here to make holes that help your products work better!
Istar Machining – Making the perfect hole, every time.
Frequently Asked Question
CNC boring is a special way to make or fix holes in parts. Unlike drilling that just makes new holes, boring makes existing holes better – smoother, more round, and exactly the right size. Our CNC machining service experts use computer-controlled machines to make holes that meet your exact needs.
Drilling makes new holes, but boring makes existing holes better – more exact in size, shape, and smoothness.
We can make holes with ±0.005mm precision – that’s about 1/5 the width of a human hair!
Yes! With our special tools, we can make holes up to 10 times deeper than their width.
Almost anything – aluminum, steel, titanium, plastics, copper, and more. Each material needs the right tools and speeds.
We check every critical hole with precise measuring tools. For important jobs, we use special sensors during machining.
It costs more than simple drilling but delivers much better quality. For parts where holes really matter, it’s worth it!
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