For a long time I ordered cutting tools the way most small shops do: copy the insert code from the last order, check the price, hit buy. Then in January 2024 I audited our 2023 tooling spend and found that roughly 6% of what we spent on inserts went to products we either returned or never mounted on a tool. That number is what changed my routine.

I handle procurement for a 22-person precision machining company. Our tooling budget runs around $85,000 a year, and I've been doing this for about nine years. This is the checklist I run before every tooling order now. Six checks, about 20 minutes, and one spreadsheet.

If you have a full-time tooling engineer and order inserts by the pallet, this is too basic for you. It's for owners, buyers, and lead machinists who have to order tooling between jobs.

Check 1: Define the operation before you open the Tungaloy catalog

The Tungaloy catalog is organized by operation — turning, boring, milling, grooving, drilling — and it assumes you know which operation you're doing. A purchase request that gives you an insert code but no material, no operation, and no depth of cut is not useful. Jumping straight to a product page skips the selection charts that point you to the right tool family in the first place.

Before I open the catalog, I write down five things:

  • Workpiece material and condition (steel bar, cast iron, stainless, hardened?)
  • Operation and the tool's function in it
  • Machine and workholding rigidity
  • Depth of cut and width of cut
  • Required surface finish and tolerance

If the application doesn't appear in the recommended range in the catalog, that's usually not a defect in the tool. It means the tool was designed for a different job.

Check 2: Verify the catalog edition and the insert dimensions

This sounds too obvious to be a checklist item. It isn't. The printed Tungaloy catalog in the tool crib might be three editions old. Grades get discontinued, and the successor grade is not always a drop-in replacement.

I check three things:

  • The edition year of the paper catalog or the version of the online PDF
  • That the section matches the operation (boring tools in the boring section, not the turning section)
  • That the insert dimensions match what I measured on the existing holder

Most of the time I use the online Tungaloy catalog and search by insert code. It beats paper, though I still keep the printed index in the office because it's faster for scanning a whole tool family when I'm not sure what exists.

Check 3: Confirm the grade and geometry against the material group

Insert grade selection is where the “it should work” assumptions happen. A grade that's excellent for continuous turning of steel can chip immediately on interrupted cuts in cast iron. The Tungaloy catalog lists the material groups each grade serves — usually following the ISO 513 classification (P, M, K, N, S, H). If a grade doesn't list your material group, ask before ordering.

Geometry matters just as much. A finishing chipformer in a roughing operation will fail no matter how good the coating is.

One honest note: everything I'd read about coated grades said newer is better. In practice, I found the previous grade lasted longer on our interrupted turning, simply because our machines cannot reach the cutting speeds the new grade was designed for. New does not mean right for your spindle. At least, that's been my experience running steel and stainless jobs on ordinary, mid-2000s VMCs.

Check 4: Check the Tungaloy logo and buy through an authorized channel

They warn you about counterfeit inserts. I didn't listen. I bought a “great deal” online once, and the packaging looked right, but the inserts chipped within twenty parts. The scrap cost us around $1,800, plus a very awkward phone call to a customer whose delivery window we missed.

Now I check the Tungaloy logo, the package print quality, the lot codes, and the distributor's status on the authorized list. If the discount is more than 30% below the usual price, I treat it as a red flag rather than a bargain.

And yes, I went back and forth between a cheaper local reseller and the official distributor for about a week. The reseller was running 12% below list. The distributor had local stock of the right grade and an application engineer who answered the phone. After the counterfeit incident, I chose the distributor. The 12% wasn't worth another $1,800 lesson.

Check 5: Calculate cost per edge, not cost per insert

This is the check I push hardest on our own team. An insert at $12 looks cheaper than one at $16, until you divide each price by the number of usable cutting edges. In our orders, that often looks like this: a $6 insert with four edges costs $1.50 per edge. An $11 insert with eight edges costs $1.38 per edge — and if it also lasts longer, the “expensive” insert isn't expensive at all.

But cost per edge is still a shortcut. The real number is total cost per finished part:

price per edge + machining time + changeover time + inspection time + scrap risk.

Cheap inserts are expensive. What I mean is: the unit-price difference disappears the moment you count the early insert change and the scrapped part it caused. We've run maybe 200 tooling orders through this system in the last five years. Actually, closer to 180 — I'd have to check the spreadsheet. The orders that hurt us were consistently the ones where I skipped this calculation.

Check 6: Ask whether this part should be machined at all

This is the step people ignore because it usually comes from a buyer, not a machinist. Not every part should go to a lathe or a mill. Before I order tooling for a job, I ask if an alternative process removes the need for that tooling completely.

For thin-walled plates, soft materials, or short runs of flat geometry, we often outsource to a shop with a water jet machining center. Water jet has no tooling cost and no heat-affected zone, and it can hold reasonable tolerances on 6mm aluminum plate. The downsides are a slightly rougher surface and the need to machine critical holes separately. For the right part, it beats buying dedicated tooling every time.

For one-offs and fixtures, I compare a resin printer against a normal 3D printer. Both are faster than machining a fixture from aluminum. The resin vs normal 3D printer decision comes down to what the fixture has to do: resin captures fine details and tighter fit-check dimensions; a normal FDM printer is tougher and just fine for clearance fixtures. I printed a set of Go/No-Go gauge blocks in resin recently, and it saved us roughly $400 per fixture versus machining them.

None of that means cutting tools don't matter. It means the cheapest tool is the one you don't need to buy.

What this checklist won't do

I'm not going to pretend it handles the hard cases. If you're cutting aerospace titanium, exotic superalloys, or running a high-volume production line, this checklist is too shallow for your world. Those jobs need a dedicated application engineer and a proper documented tooling strategy. Know the difference between “simple and sufficient” and “too simple to be honest.”

Mistakes that still show up in our orders

  • Opening a product page before defining the operation. The Tungaloy catalog is only useful if you use its selection logic first.
  • Skipping the authenticity check because “it's just one small order.” One small order is exactly how counterfeits get into inventory.
  • Comparing unit prices instead of cost per edge. It's the most expensive mistake on this list and the hardest habit to unlearn.
  • Ordering a replacement grade without checking whether the old grade was discontinued and why.
  • Not documenting anything. An order without a note about material, operation, and expected tool life can't be audited — and can't teach you anything either.

That's the whole routine. Six checks, about 20 minutes, and one spreadsheet. Since I started using it, our tooling spend stayed flat while job volume grew about 15% in 2024. It won't turn you into a tooling engineer, but it will stop you from making the same mistakes I made.