Skip to content
Setup guide

Setting up a carbide slitting saw

Most slitting-saw trouble — chatter, slippage, chip packing, poor finish — is a setup problem, not a tool problem. Here's the procedure to clean, ring in, and indicate a saw so it runs true and cuts smooth.

Open the saw calculator
The full setup procedure — cleaning, ringing in the saw, runout limits, and balanced coolant — for chatter-free slitting.

Why setup makes or breaks a slitting saw

A slitting saw is thin, and it grips on a small hub far from the cut, so it's unforgiving of runout. A few tenths out and the saw wobbles: it cuts wide, chatters, packs chips in the slot, and wears unevenly. The good news is that almost all of that is controlled at setup. Get the saw clean, seated flat, and indicated within limits, and the same tool that was fighting you will run true and quiet.

The setup procedure, step by step

1

Start clean

The saw, arbor, and tool holder all have to be thoroughly clean and in excellent condition. A single chip or burr between mating faces will throw the saw out before it ever cuts.

2

Use precision arbors and holders

Use only arbors and holders held to .0002" (two tenths) on both diameter and runout. The assembly can only run as true as the parts holding it.

3

Ring in the saw

Seat the saw dead flat against the hub so it "rings in" — clearance between the faces can be under .0001". A saw that isn't seated flat will never indicate true no matter how you tighten it.

4

Hand-tighten — don't crank

Hand-tighten with moderate force only. Over-tightening distorts the saw and the arbor and actually increases runout; it does not add grip.

5

Check side runout

Indicate the side of the saw and keep side run-out under .0005" (five tenths). If it's more, break the assembly loose, clean it, and re-ring. If it still won't come in, inspect the holder and arbor for damage.

6

Check tooth-to-tooth runout

For saws thicker than .020", measure tooth-to-tooth: spin the saw opposite its cutting direction against a dial indicator or vision system, note the highest reading at each tooth, and take largest minus smallest. Keep the spread around .0001". Too much means clean and repeat.

7

Balance the coolant

Set coolant to heavy, equal flow on both faces of the saw. Unequal coolant pushes the saw to one side and causes problems — it's one of the most common hidden causes of slitting trouble.

8

Then listen

Start from RobbJack's recommended speeds and feeds and listen as it cuts. A correct setup sounds smooth, with no re-cutting of chips. A harsh or ragged sound means chips are packing or the saw is slipping — stop and re-check.

Runout limits at a glance

Four checks decide whether a slitting saw runs true. Hold these and the saw cuts to size with a clean finish; miss them and no speed-and-feed change will save the cut.

CheckLimit
Arbor & holder — diameter and runout.0002"
Saw seating (ring-in) clearance< .0001"
Side runout< .0005"
Tooth-to-tooth runout (saws > .020")~.0001"

Balance the coolant

Run heavy coolant in equal flow to both faces of the saw. Unequal flow loads one side and pushes the saw off true — a quiet, common cause of slitting problems. A thru-coolant arbor solves this by feeding coolant straight to both faces and flushing chips out of the slot.

Then listen

Start from RobbJack's recommended speeds and feeds and let the cut tell you. A correct setup sounds smooth and steady, with no re-cutting of chips. A harsh, ragged note means chips are packing or the saw is slipping — stop and re-check the seating and runout before you keep cutting.

Precision starts with the arbor

You can only ring a saw in as true as the arbor under it. RobbJack's NAB ultra-precision thru-coolant arbors are ground to under .0002" runout and grip the saw up to 15× more tightly than a standard arbor, so it can't slip or spin — and they deliver high-pressure coolant straight to both faces of the saw at once, where flood coolant can't reach past the fixture and part.

The Thru-Coolant NAB arbor in action — coolant fed to every saw face for consistent, chatter-free slitting. (RobbJack product film.)

Setting up a thru-coolant gang

Stacking more than one saw — a gang — is where coolant routing matters most, because the inner saw faces are buried in the stack. The thru-coolant system solves it: a pair of carbide flanges feed the two outer faces, and a carbide spacer between each pair of saws feeds coolant to the faces in the middle. Build the stack in this order, from the arbor out to the nut:

  1. 1
    NAB thru-coolant arbor bodyGround to under .0002" runout, 15× the grip.
  2. 2
    CF carbide thru-coolant flangeFeeds coolant across the outer saw face. Sold in pairs — two are required.
  3. 3
    Slitting saw — flat, parallel hubK-Series recommended for any gang.
  4. 4
    CSP carbide thru-coolant spacerFeeds coolant between the saws. Any thickness .002"–.250".
  5. 5
    Slitting saw — flat, parallel hubEach saw face gets its own coolant.
  6. 6
    CF carbide thru-coolant flangeSecond of the pair — carbide flanges never wear out.
  7. 7
    NAB arbor nutHand-tighten. Keep the total saw + spacer stack under 50% of the cap length.
Two rules for the stack: use a K-Series saw with its flat, parallel hub for any gang — flush hub contact adds grip, cuts runout, and stops chip packing — and keep the total thickness of all saws and spacers under 50% of the arbor's cap length. Carbide flanges and spacers don't wear, burr, or scratch the saw, so the gang stays true run after run.

Precision that holds

.0002"
arbor & holder precision — on diameter and runout
15×
more gripping force with a NAB thru-coolant arbor
Up to 200%
feed-rate increase in a gang saw operation

Keep going

Saw still won't come in?

Send us the saw, arbor, and the cut you're making — our application engineers will dial in the setup or spec the right arbor and saw for the job.

Talk to an engineer