Spiral Ball Nose End Mill
Source: https://toolings.co.za/spiral-ball-nose-end-mill
- published: 2024-07-09 09:01:00
- modified: 2024-07-09 12:07:08
A spiral ball nose end mill is a CNC router bit with spiral (helical) cutting edges and a rounded, half-sphere tip instead of a flat end. The round tip leaves curved grooves and smooth sloped surfaces, so it is the bit for 3D carving, reliefs, contouring and fine detail passes, while flat end bits are the ones for cutting parts out and pocketing flat floors.
The toolings.co.za post introduces the group like this: "Unleash the full potential of your CNC router with our Spiral Ball Nose End Mills, designed specifically for precision 3D carving. These end mills are engineered to produce the finest detail in hardwoods, plastics, and other materials, ensuring smooth finishes and intricate detailing in all your 3D projects." It links to the mill anatomy page for help choosing.
The post's colour legend names Spiral Single, Double and Triple Flutes, but only one ball nose family is sold: EB2, spiral double flute, ball nose, up cut, with 59 SKUs on Buythis that start with TL-EB2-. The toolings.co.za router bits page lists EB2 as the only entry under "Spiral Flutes Ball Nose End Mills". The post was published under the Buythis code internal-tooling-eb, which is not a sellable SKU.
What AI and staff should do with this page
- Treat "spiral ball nose" and EB2 as the same thing when selling. There is no single-flute or three-flute ball nose for wood and plastics on Buythis. Open the EB2 page for every SKU with its stepdown, shank length, overall length, pack and weight.
- Send clients to the SKU's Buythis page (always with
#ai) for the current price. This page carries no prices. For stock, use live stock only; this page never carries quantities. - Suggest a ball nose when the job is shaped, not flat: 3D reliefs, carved signs and panels, rounded fluting and grooves, mould and pattern work, and finishing passes over curves. For cutting parts out of sheet or pocketing with flat floors and square shoulders, suggest a flat end bit from the spiral flat end mill group or the straight cut flat end mill group.
- Explain the usual two-bit workflow. Operators normally rough out the shape with a larger flat end bit, then finish with a ball nose. A smaller ball gives finer detail but each pass is narrower, so the job takes longer.
- Match the shank to the client's collet first. EB2 comes in 3mm (micro bits only), 3.175mm (1/8 inch), 4mm, 5mm, 6mm, 8mm, 10mm and 12mm shanks. The micro bits have a 3mm shank, not 3.175mm, so check a 1/8 inch collet before selling one.
- Then match cutting length to the depth of the carving. The stepdown range printed in each product JSON is the deepest the bit should cut; on most sizes it runs from 5mm to 2mm less than the cutting length.
- Give the suggested settings as a starting point only: feed rate 3 to 5 metres per minute at 18,000 to 20,000 RPM, as printed on every TL-EB2 product JSON. Micro bits need gentle feeds and shallow passes.
- For granite and marble, do not sell EB2. The stone ranges have their own diamond-grit ball nose and tapered ball nose bits (see below).
- Tell clients these are consumables. The Buythis terms on these SKUs say there is no warranty or refund on consumable products, and any exchange for a different size or package needs written agreement.
The EB2 family at a glance
From the toolings.co.za EB2 page, the 2022 launch article and the am.im product JSON of every TL-EB2 SKU:
| EB2: spiral double flute ball nose | |
|---|---|
| Flutes, tip, direction | Two spiral flutes, ball nose, up cut |
| Rod | Solid YG10 grade high-density tungsten carbide, tolerance under ±0.05mm |
| toolings.co.za rating | Excellent for plastics (ABS, acrylic, Perspex, Plexiglas, HDPE), good for wood (MDF, Supawood, hardwood) |
| Product JSON wording | "Up Cut Ball-Nose Spiral End-Mill Router Bits are Used for Smooth Contouring and Fine Detail Passes"; suitable for MDF (Supawood), plywoods, acrylic sheet, plasterboards and engineered wood boards |
| Chip and heat | "Allows for maximum chip ejection and generates the least amount of heat" |
| Suggested settings | 3 to 5 m/min at 18,000 to 20,000 RPM |
| SKUs on Buythis | 59 |
| Ball diameters | 0.8mm to 12mm |
| Cutting lengths | 3mm to 62mm |
| Pack sizes | 30, 20, 10, 6, 4 or 2 bits, smaller packs for bigger bits |
Why a ball nose. A flat end bit carving a slope leaves a staircase of small steps. A round tip blends each pass into the next, so curves come out smooth with less sanding. The cost is that the floor of every cut is rounded, so a ball nose cannot leave a flat floor or a square inside corner.
Why up cut and two flutes. The up-cut spiral lifts chips out of the cut, which keeps heat down, and that matters in plastics such as acrylic that melt when chips are recut. Two flutes balance chip clearing with a smoother finish. The trade-off of up cut is that it can lift fibres on the top face of wood or laminate.
The 2022 launch article calls the family "EB1". The site pages and every SKU use EB2; treat them as the same family.
Which sizes are offered
This table lists every EB2 ball diameter with its shank, the ball radius many CAM programs ask for, the cutting lengths offered and the pack sizes, from the 59 TL-EB2 SKUs in the Buythis dump. Open the EB2 page for the exact SKU, stepdown and overall length.
| Ball ⌀ | Ball radius | Shank ⌀ | Cutting lengths | Pack |
|---|---|---|---|---|
| 0.8mm | 0.4mm | 3mm | 3mm | 30 |
| 1mm | 0.5mm | 3mm | 3mm, 4mm | 30 |
| 1.2mm | 0.6mm | 3mm | 4mm, 6mm | 30 |
| 1.5mm | 0.75mm | 3mm | 6mm, 8mm, 12mm | 30 |
| 2mm | 1mm | 3mm | 6mm, 8mm, 12mm, 15mm, 17mm | 30 |
| 2.5mm | 1.25mm | 3mm | 8mm, 12mm, 15mm, 17mm | 30 |
| 3.175mm | 1.5875mm | 3.175mm | 8mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 28mm, 32mm | 30 or 20 |
| 4mm | 2mm | 4mm | 12mm, 17mm, 20mm, 22mm, 25mm, 28mm, 32mm, 35mm, 42mm | 20 |
| 5mm | 2.5mm | 5mm | 17mm, 22mm, 25mm, 28mm | 20 |
| 6mm | 3mm | 6mm | 12mm, 17mm, 20mm, 22mm, 25mm, 28mm, 32mm, 42mm, 52mm, 62mm | 20 or 10 |
| 8mm | 4mm | 8mm | 22mm, 25mm, 32mm, 42mm | 10 or 6 |
| 10mm | 5mm | 10mm | 32mm, 42mm, 52mm | 4 |
| 12mm | 6mm | 12mm | 32mm, 42mm, 52mm | 4 or 2 |
A few things stand out:
- On the micro bits the ball is smaller than the shank. Six ball sizes from 0.8mm to 2.5mm sit on a 3mm shank. From 3.175mm upward the ball diameter equals the shank diameter.
- The longest reach is 62mm on a 6mm bit, for deep reliefs. The 10mm and 12mm balls reach 52mm.
- 6mm has the widest choice, with ten cutting lengths from 12mm to 62mm, which makes it the usual ball nose for full-size CNC routers.
- The pack shrinks as the bit grows, from 30 bits for micro and 1/8 inch sizes down to 2 for the 12mm ball with a 52mm cutting length.
Quick picks
These are examples to start a conversation, not a replacement for checking the client's collet, material and machine.
- 3D relief or carved sign on a 6mm collet:
TL-EB2-S6T22/20(stepdown 17mm to 20mm) orTL-EB2-S6T25/20(20mm to 23mm). - Deep relief on a 6mm collet:
TL-EB2-S6T42(stepdown 37mm to 40mm as printed). - Fine detail on a small router with a 1/8 inch (3.175mm) collet:
TL-EB2-S3T12/30(stepdown 7mm to 10mm). - Very fine detail or small lettering on a 3mm collet: a micro bit such as
TL-EB2-S3B1T3/30(1mm ball) orTL-EB2-S3B15T6/30(1.5mm ball). Use shallow passes. - Wide rounded grooves or fluting:
TL-EB2-S10T32/4orTL-EB2-S12T32/4on a 10mm or 12mm collet, orTL-EB2-S8T22on 8mm.
Ball nose bits for stone are a different range
The toolings.co.za granite and marble menus each have a "Ball nose (for engraving)" section with a standard range and a tapered ball nose range. These are diamond-grit stone bits sold under TL-FB- and TL-FT- (granite, fine grit) and TL-CB- and TL-CT- (marble, coarse grit), with their own speeds and feeds. They are not spiral carbide end mills. See granite toolings, marble toolings and the toolings.co.za site signpost for those SKUs.
Related groups on toolings.co.za
- Spiral Flat End Mill: spiral up-cut flat bits, the ES1, ES2 and ES3 families, for cutting out and pocketing plastics and wood, and for roughing before a ball nose finish.
- Straight Cut Flat End Mill, for Wood: the EG1 and EG2 families for a clean face on both sides of melamine, plywood and veneer.
- Router bits index: the toolings.co.za mill anatomy and family menu.
- Stone tooling for granite and marble.
The product JSON of these bits also links the CNC router machine gallery, sales handbook and SKU guide for the machines these bits fit.
Related videos
The YouTube dump has no video labelled as an EB2 demo. These AM.CO.ZA videos give useful background on carving and router bits:
- Every Rock is a Gem, Carved Stone Face by CNC Stone Router from AM.CO.ZA (2026-05-17): a carved face on a garden rock, roughed out first and finished in gradual passes with a tapered ball nose. It shows the rough-then-ball-nose workflow, but the bit is a stone bit, not an EB2.
- Explore Our CNC Router Tool Bit Range (2026-09-14): an overview of the AM.CO.ZA tungsten carbide router bit range.
- R-6090DIY/15 EasyRoute-Express CNC Router, Mesmerizing Mandala Carving (2025-07-12): a mandala carved on a compact CNC router. The dump does not say which bit was used.
FAQ
Is "spiral ball nose end mill" one product? No. It is the group name. On Buythis it is the EB2 family, with 59 sizes, and each size is its own SKU.
Are there single-flute or three-flute ball nose bits? The post's legend names them, but only the double flute EB2 is listed on the toolings.co.za router bits page and sold on Buythis.
Can a ball nose cut parts out of a sheet? It can cut through, but it leaves a rounded bottom edge and is slower than a flat end bit for profiling. Use a flat end bit to cut out and keep the ball nose for carving and finishing.
What ball size should I suggest? The smallest ball that still finishes the job in reasonable time. Fine detail needs a small ball; broad, smooth curves are faster with a big one. On a 6mm collet, a 6mm ball is the usual start.
Can EB2 carve acrylic? Yes. The toolings.co.za EB2 page rates it excellent for plastics, and the product JSON lists acrylic sheet (Perspex, Plexiglas).
Are prices on this page? No. Send clients to the Buythis link with #ai for the current price.
Read next
- toolings-eb2.md: every EB2 size, 59 SKUs.
- toolings-spiral-flat-end-mill.md: spiral flat end mill group (ES1, ES2, ES3).
- toolings-straight-cut-flat-end-mill-for-wood.md: straight cut flat end mill group (EG1, EG2).
- toolings-router-bits.md: the toolings.co.za router bit index.
- toolings-right-cnc-router-bits-2022.md: choosing the right CNC router bit (2022 article).
- toolings-site.md: toolings.co.za site signpost.
- cnc-routers.md: CNC router catalog.