CNC Gear Grinding Invar from VT machining delivers precision Invar parts produced to your exact drawing. Gear grinding finishes hardened gear teeth to high accuracy class for quiet, durable transmission, and we tune every parameter to the behaviour of Invar, which is ultra-low thermal expansion.
Process Data for CNC Gear Grinding Invar
| Wheel (supply condition) | Aluminium oxide, soft grade |
|---|---|
| Depth per pass (rough / finish) | 0.01-0.03 / 0.002-0.005 mm |
| Achievable finish | Ra 0.2-0.4 µm |
| Typical size tolerance | ISO 1328 class 4-6 |
Shown for Invar 36, the most common Invar grade we see for CNC Gear Grinding. Typical values for Invar 36, Annealed; confirmed on the first part.
CNC Gear Grinding Capability for Invar
- DIN/AGMA accuracy class
- Profile & lead correction
- Hardened-gear finishing
- Low transmission noise
Invar material properties, finishing options and grade notes are on our CNC Gear Hobbing Invar page.
How CNC Gear Grinding Invar Works
Tooth profiles are generated in the Invar blank by a synchronised cutter, then refined to the required accuracy class. Module, pressure angle and helix are programmed from your gear data.
We start from your supplied geometry and tolerance scheme. The setup is designed to minimise re-clamping, which protects positional accuracy across features. A first article is verified against the drawing before the balance of the batch is released.
Achievable Tolerances for CNC Gear Grinding Invar
| Feature | Standard | Precision |
|---|---|---|
| Accuracy class | DIN 8 / AGMA 10 | DIN 6 / AGMA 12 |
| Profile deviation | 0.020 mm | 0.008 mm |
| Lead deviation | 0.020 mm | 0.008 mm |
| Pitch deviation (cumulative) | 0.040 mm | 0.015 mm |
| Runout | 0.030 mm | 0.010 mm |
| Tooth surface finish | Ra 1.6 µm | Ra 0.4 µm (ground) |
| Module range | m0.5–m8 | m1–m6 |
Standard is what a normal quotation assumes. Precision is available on nominated features and is priced separately, because it needs extra setups, in-process gauging and CMM verification. Call out only the features that need it — blanket-tightening a drawing is the single most common reason a quote comes back expensive.
CNC Gear Grinding Tolerances & Surface Finish
Gear features are produced to a specified DIN/AGMA accuracy class, with profile and lead controlled for quiet, durable running under load.
The tightest tolerances are reserved for the features your drawing flags as critical. Share your tolerance scheme and we will confirm what is realistic before quoting.
Design Tips for CNC Gear Grinding Invar
Small design adjustments often cut cost and lead time. Providing complete gear data (module, pressure angle, profile shift, quality class) lets us produce Invar gears right the first time. If you send your model early, we will return practical DFM feedback before you commit to production.
Applications of CNC Gear Grinding Invar
Invar parts made this way are found throughout aerospace, medical, automotive, electronics and industrial equipment. Prototype, bridge and production volumes are all welcome.
Typical Invar Parts for CNC Gear Grinding
Illustrative examples of CNC Gear Grinding Invar parts and the callouts that usually drive the process plan. They show the kind of work that fits this process; they are not specific customer orders.
Bevel gear pair
- Material
- Invar
- Size
- m2, z20/z40, 90° axes
- Key callouts
- DIN 8, mounting distance ±0.03 mm
- Batch
- 200 sets
Contact pattern checked on a rolling tester before release.
Spur gear
- Material
- Invar
- Size
- m2, z40, 20° PA, face 20 mm
- Key callouts
- DIN 7, runout 0.02 mm
- Batch
- 500 pcs
Hobbed, hardened, then hard-finished; skipping the finish pass costs a full accuracy class.
Helical pinion
- Material
- Invar
- Size
- m1.5, z18, 15° helix
- Key callouts
- DIN 6, lead deviation 0.008 mm
- Batch
- 300 pcs
Ground after case hardening to 58 HRC at 0.6 mm case depth.
No drawing yet? Build one in the browser.
Set the metal, dimensions and features, watch the 3D model update as you type, then switch to the 2D sheet to add dimensions and tolerances. Download it or send it straight to us with your RFQ.
What We Need to Quote CNC Gear Grinding Invar
- GeometrySTEP or IGES for the 3D model, plus a PDF drawing if you have tolerance callouts. A dimensioned sketch is enough to start.
- MaterialThe exact Invar grade and condition — temper, heat-treat state or hardness. If you are not sure, tell us the function and we will suggest one.
- QuantityPrototype count and the expected annual volume. Both change how the part is made and therefore what it costs.
- TolerancesWhich features are critical. Everything else runs to our standard tolerance, which is what keeps the price sensible.
- FinishSurface treatment, cosmetic requirements, and any faces that must be masked.
- DocumentsWhether you need a material certificate, dimensional report, FAIR or PPAP with the shipment.
Missing something from the list is not a problem — send what you have. We will come back with the specific questions rather than a generic form.
Other Metals for CNC Gear Grinding
Other Processes for Invar
Send the drawing, the Invar grade and the quantity. You get pricing, lead time and any DFM notes back — usually within one business day.
Request a QuoteFrequently Asked Questions
What gear accuracy class can you achieve on Invar?
Gear accuracy is specified to DIN/AGMA classes appropriate to the application. Profile and lead are controlled so Invar gears run accurately and quietly under load.
Can VT machining make custom Invar parts to my drawing?
Yes. Invar gear cutting is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
What is CNC Gear Grinding Invar and how is it done?
CNC Gear Grinding Invar refers to gear grinding finishes hardened gear teeth to high accuracy class for quiet, durable transmission. Applied to Invar — ultra-low thermal expansion — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
What material thickness or size range suits CNC Gear Grinding Invar?
We machine Invar across a broad size range; share your part envelope for confirmation.