Machining Speeds & Feeds Card
One page. Speeds, chip load and drill feed, imperial and metric.
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BuyBoring Bar Types — Which for the Job
Solid carbide vs indexable vs boring head vs anti-vibration (damped) bars — rigidity, adjustability, cost, and when each wins
The guide names the types. This page is the decision fork: which class to buy or pull from the cabinet for a bore diameter, depth, and tolerance. Pair with the calculator after you pick the tool.
The Decision Fork in One Minute
Pick by constraint
- Small bore / short reach → solid carbide
- General lathe production >~0.5" → indexable
- Mill spindle / offset / adjustable Ø → boring head
- Deep L/D >4:1 that must cut → damped / anti-vibration
Tradeoffs
- Solid: stiffest for size, less flexible inserts
- Indexable: insert economy, slightly less stiff
- Head: dial-in diameter, more joints = less rigidity
- Damped: reach, higher cost, still needs decent setup
Rule: Do not buy a damped bar to fix a 6:1 stick-out you can shorten. Fix geometry first; damp when depth is real.
Solid Carbide (and Solid HSS) Boring Bars
Best for: Small bores, short-to-medium overhang, high stiffness per diameter, shops that want a simple one-piece tool.
Pros: Maximum rigidity for a given shank size; excellent for miniature and precision short bores.
Cons: Tip geometry is fixed or brazed; less economical when edges die often; not the first pick for frequent grade changes.
Indexable Boring Bars
Best for: Everyday lathe boring above roughly 0.5" where insert grades change by material.
Pros: Swap CCMT/DCMT/etc. without changing the bar; lower long-run insert cost; shop-standard tooling.
Cons: Pocket and clamp add a little compliance vs solid; still limited by L/D like any undamped bar.
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Indexable Boring Bars & Lathe Tooling
Five lathe/boring picks from the TestTalkHQ affiliate catalog — indexable sets and SCLCR bars matched to the type decision
Set
OSCARBIDE 3/4" Shank Indexable Boring Bar Set 8 Pieces
- 3/4" indexable set for everyday lathe boring
- Insert grades change without swapping the shank
- Best when L/D is still in conventional range
Accusize 4 Pc 1/2" Round Shank Indexable Boring Bar Set
- Smaller 1/2" shank for tighter bore clearance
- Four-piece set for common ID diameters
- Prefer when solid carbide isn’t required
iCarbide 1/2" Shank Indexable Boring Bar 6pc Set
- Six-piece coverage at 1/2" shank
- Shop kit when insert economy matters
- Keep stick-out short for stiffness
Accusize 1/2" × 7" Right-Hand SCLCR Indexable Boring Bar
- Dedicated RH SCLCR for repeat ID cuts
- 7" length for moderate depth jobs
- Indexable tip for finish/size recovery
Accusize 1-1/2" × 14" Right-Hand SCLCR Indexable Boring Bar
- Larger shank when depth needs more stiffness
- 14" reach class — still mind L/D physics
- Indexable alternative before buying damped
As an Amazon Associate, TestTalkHQ earns from qualifying purchases. Indexable bars win on insert flexibility; damped bars still win when L/D must exceed ~4:1.
Boring Heads (Usually on Mills)
Best for: Work on a mill, offset holes, parts too large to chuck, or when you must dial diameter finely without changing inserts.
Pros: Micrometer-style diameter adjustability; flexible setups.
Cons: More joints → less rigidity than a short solid bar; not a substitute for a lathe boring bar on deep chucked work when a lathe is available.
FAQ crossover: mill vs lathe boring choice also appears in the guide FAQ.
Anti-Vibration / Damped Boring Bars
Best for: Real deep bores where L/D must exceed ~4:1 and you cannot shorten stick-out.
Pros: Internal damper extends stable reach toward 7:1–10:1 class performance.
Cons: Cost; still fails if setup is loose, tip off-center, or DOC absurd; not magic for chip pack.
If the symptom is chatter at long overhang, diagnose first: Boring Bar Troubleshooting.
Quick Selection Matrix
| Job signal | Lean toward | Why |
|---|---|---|
| Bore < ~0.5", short stick-out | Solid carbide | Stiffness per diameter |
| Production lathe, insert changes often | Indexable | Grade flexibility / cost |
| Mill, offset hole, dial diameter | Boring head | Adjustability on spindle |
| Depth forces L/D > 4:1 | Damped bar | Resonance control |
| Tight IT grade on shallow bore | Solid or quality indexable + spring passes | Fewer joints, better repeatability |
Frequently Asked Questions
Can an indexable bar replace a damped bar for deep bores?
Only if you can shorten stick-out or upsize diameter. Undamped indexable bars still obey L/D physics.
Should I use a boring head on the lathe?
Usually no — heads belong on mills. Use a lathe boring bar when the work swings in a chuck.
Is solid always better than indexable?
For tiny stiff setups, often yes. For production insert economy above mid sizes, indexable usually wins.
Where do speeds and feeds come from after I pick a type?
Calculator and chart — type choice does not replace SFM/IPR setup.