KYOCERA SGS Precision Tools Group
KYOCERA SGS Precision Tools Group
Every machinist has been there. You’re standing at the spindle, a cut isn’t going the way you planned, the surface finish looks rough, or a tool lets go way before its time. The immediate, instinctual reaction on the shop floor? “Why are we spending money on this garbage tooling?”
On this episode of Tips and Chips, our own East Coast Applications Engineer, Andy Greaves, sat down with Ian Sandusky, owner of Lakewood Machine and Tool and contributor for Practical Machinist, to look past the carbide and tackle why the tool always takes the fall for an unstable process.
“When we’re at the shop floor, when we’re at the spindle, one of the first things that gets blamed if there’s an issue is the tool,” Ian points out. “The first thing people do is say, ‘Why did we spend money on this tool? It’s not the right tool for the job.’ The amount of times that we’re proven wrong on that is, at this point, not surprising.”
Andy’s take is simple: the cutting tool is often the most visible component in a much larger system. Because it is easy to replace, it is often the first thing to receive the blame.
When Ian asked Andy what the absolute number one culprit is when people come claiming a tool failed, Andy didn’t hesitate with his answer: the setup.
Andy: “I’d say the biggest contribution to that is probably the setup. Really. Whether it’s held in a vise and it’s hanging off the end, or whether it’s not really well supported, or if the tool holder is like way longer than it needs to be, that is a really common one. Somebody might be trying to run a seven-flute, three-quarter-inch tool in a CAT40 holder with four inches of stick-out. It’s just not going to work. You’re not going to get the results you’re looking for.”
Ian: “Exactly. I think the thing that people see a lot too, is they’ll see like a gorgeous machine, like this DMG Mori, take a huge cut and then they’ll go to their own machine, which may not have that spindle rigidity. They may not be running the same vises, they may not be running the same chucks, and all of a sudden they’re confused as to why it’s not working. And then, yeah, they might blame the tool.”
When a setup lacks rigidity, micro-vibrations develop rapidly. Those tiny, rhythmic shocks smash against the sharp carbide edge, causing it to fail prematurely long before the tool reaches its expected life.
To systematically diagnose a failure without playing guessing games, Ian and Andy recommend a disciplined approach to troubleshooting on the shop floor: start at the spindle and work down.
“First of all, when you’re troubleshooting, only change one variable at a time,” Ian explains. “If something’s going wrong in there, and I change the tool, the holder, the drawbar stud, and the workholding all at once, even if it works right the next time, I have no idea which one fixed it.”
To keep your troubleshooting scientific and repeatable, isolate your variables in this specific sequence:
Modern high-efficiency toolpaths make it easy to assume that the programmed engagement matches what the cutter actually encounters on the shop floor. However, a tool intended for a light 10% radial engagement can suddenly encounter a 40% engagement due to unverified raw stock conditions, tight internal corners, or incorrect CAM settings.
When the cutter hits an unexpected pocket of un-machined material or experiences a severe corner-loading spike, the deflection skyrockets. The resulting chatter and instantaneous edge failure appear to be a tooling problem, but the root cause is entirely a programming issue.
Counterintuitively, one of the fastest ways to destroy a high-performance cutter is to run it too conservatively. It is an incredibly common habit shared by almost every shop owner when testing a premium tool for the first time: fear of the manufacturer’s recommended speeds and feeds.
Ian: “If we get an SGS tool in and lets say we’re running at 10,000 RPM at 200 inches a minute, we don’t trust that right off the bat… I remember the first time we ran one of the Raptor minis, we halved everything when we were running it. And we were surprised that our tool life wasn’t as good! The second we actually listened and dialed it up, the chips formed correctly and the heat left with the chip.”
Andy: “If you baby a high-performance tool, it’s not going to give you what you need. Running too slow is often worse than running too fast. If you want to run slow and careful, a high-performance tool isn’t for you, you might as well stick to a general-purpose cutter.”
High-performance tools are engineered with larger core diameters, specialized flute geometries, optimized helix angles, and advanced coatings designed to handle higher cutting loads. If you drop the feed rate too far, the tool stops shearing and begins to rub. In materials like aluminum or tough alloys, rubbing creates intense friction, material adhesion, rapid heat build-up, and rapid edge wear and premature tool failure.
The hesitation to adopt high-performance tooling usually boils down to upfront costs, a pricing hurdle that prevents many shops from realizing significant productivity gains.
“A customer will say, ‘I don’t need a high-performance end mill, a general-purpose carbide tool will do… I’m not paying that extra cost,’” Andy says. “But if we can convince them to test a high-performance tool, like our Z-Carb AP, we can easily double the feed rate. Even if that tool costs 30% or 40% more, the machining time comes down massively. And the hourly rate of a machine spindle is way more than a tool will ever be.”
A spindle sitting idle costs money whether the tool running inside it costs $25 or $750. In many cases, the machine time saved can recover the additional tooling cost far faster than most shops expect.
As Ian pointed out, if ten variables are affecting a cut and only one of them is the tool, those other nine hidden mechanics of the setup deserve just as much attention as the carbide.
When a job starts acting up, you don’t have to burn through expensive carbide trying to guess the solution. To close out the discussion, Ian issued a reminder to shop owners about an asset that is frequently left on the table.
Ian: “As shop owners, we have limited time and limited resources. Lean on your applications engineers. It’s a great resource to have, and I feel like it’s underutilized.”
Andy: “Absolutely. Whether it’s by phone, email, or if we need to come directly on-site to look at your setup, that’s what we’re here for. We aren’t just going to give you a tool and wish you good luck. We want to dial in and help you get the absolute most out of it.”
A massive part of an applications engineer’s job isn’t just diagnosing the setup and cutting conditions —it’s understanding the human element at the machine control.
“You need to understand that level of technical ability,” Andy emphasizes. “Are they new to it? Do they have 20 years of experience? What makes sense to me and you might be gibberish to somebody else.”
Successful troubleshooting on the shop floor often starts by evaluating the experience level of the operator and communicating solutions accordingly. As Andy points out, “People need to be approached differently. Applications need to be approached differently.”
There is rarely only one single, correct machining strategy to solve a problem. There are often five different ways to make a part, the goal of a good applications engineer is to figure out which of those five solutions works best for that specific shop’s machine, tooling, setup, and team.
At the end of the day, a successful cut relies on the entire machining ecosystem, not just the carbide at the spindle. By stepping back, checking the setup, and shifting away from the blame game, shops can easily reclaim lost machine time and get the true performance they paid for. Big thanks to Ian Sandusky for stopping by the facility. For the full conversation and deeper technical insights, check out the complete episode of Tips and Chips linked above.
Q: Why does my end mill chatter?
A: Chatter is caused by harmonic vibrations bouncing between the cutting tool, holder, and workpiece. It is primarily driven by an un-rigid setup, excessive tool stick-out, loose workholding, or a programming mismatch (like taking too heavy of a radial cut). Shortening the tool extension, switching to a vibration-damping holder or hydraulic chuck, or reducing radial engagement will help stabilize the harmonics.
Q: Why is my carbide tool failing?
A: While the tool is the part that breaks, failure is usually a symptom of an environmental issue. Check for excessive runout, fluctuating material hardness, inadequate coolant delivery, or a machine spindle that is bogging down under heavy loads. Use the spindle-down troubleshooting method to isolate the root cause.
Q: Can running too slow damage a cutting tool?
A: Yes. When your feed rate falls below the manufacturer’s recommendations, the chip thickness falls below the effective cutting edge radius. Instead of cleanly shearing the metal, the tool begins to plow and rub. This creates massive friction, generates extreme heat, causes material to weld to the flutes, and rapidly destroys the tool edge.
Q: Why is my tool life inconsistent?
A: Inconsistent tool life points to a shifting variable in your machining ecosystem. The most common culprits are material variation between raw stock batches, unstable part clamping in the vise, or operators manually overriding the programmed feed rates on the control panel.
Q: Why does a new cutting tool perform worse than the old one?
A: If you replace a general-purpose cutter with a high-performance tool but keep your old, conservative speeds and feeds, the premium tool will perform poorly. High-performance geometries require aggressive parameters to properly form chips and throw heat away from the cutting zone. Babying them will cause immediate rubbing and rapid wear.
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