--- product_id: 408202844 title: "Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes" brand: "assorts" price: "$201.59" currency: USD in_stock: true reviews_count: 5 category: "Assorts" url: https://www.desertcart.ec/products/408202844-radius-and-ball-turning-attachment-for-mini-lathes-precision-concave store_origin: EC region: Ecuador --- # Fits 7x14 & 7x16 mini lathes 3/8" HSS Shank - precise fit Up to 65mm radius turning Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes **Brand:** assorts **Price:** $201.59 **Availability:** ✅ In Stock ## Summary > 🛠️ Turn your mini lathe into a precision powerhouse—don’t miss the perfect curve! ## Quick Answers - **What is this?** Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes by assorts - **How much does it cost?** $201.59 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/408202844-radius-and-ball-turning-attachment-for-mini-lathes-precision-concave) ## Best For - assorts enthusiasts ## Why This Product - Trusted assorts brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Material Options:** Choose HSS for versatile everyday use or carbide inserts for heavy-duty, high-precision cutting. - • **Versatile Radius Range:** From small 3/8" shanks to 65mm max radius, tailor your tool to every custom turning project. - • **Precision Sphere Crafting:** Achieve flawless concave & convex profiles for knobs, domes, and handles with unmatched accuracy. - • **Durability Meets Performance:** Built with premium tool steel and epoxy finish to withstand repeated workshop use and maintain precision. - • **Seamless Lathe Compatibility:** Designed specifically for popular 7x14 & 7x16 mini lathes—upgrade your setup without hassle. ## Overview The Radius & Ball Turning Attachment by Assort Machine Tools is a precision tool designed for 7x14 and 7x16 mini lathes, enabling smooth and accurate concave and convex turning up to a 65mm radius. Available in high-speed steel or carbide inserts, it offers durable construction and versatile compatibility, making it ideal for professional and hobbyist machinists seeking flawless spherical profiles on metals and plastics. ## Description Product Description Precision Spherical Turning for Your Mini Lathe The Assorts Radius Ball Turning Tool brings a new level of capability to your 7x14 or 7x16 mini lathe. With a 3/8" shank HSS tool bit, it's designed to handle both concave and convex spherical turning with smooth, consistent results. Whether you're working with soft aluminum, brass, or harder steels, this tool supports ball radius turning up to 65mm, giving you the flexibility to take on a wide range of projects. Its compact, straightforward design fits directly onto your existing mini lathe — no complex setups or costly machine upgrades needed. Built for Durability, Designed for Precision The Assorts Radius Ball Turning Tool is constructed from premium materials to hold up through repeated use in demanding workshop environments. Whether you're a hobbyist tackling weekend projects or a machinist running regular production work, this tool is built to deliver consistent, reliable performance over time. Its compact design makes tool changes quick and straightforward, helping you stay focused on the work at hand. From soft metals like aluminum and brass to harder steels, it handles a wide range of materials without skipping a beat — keeping your mini lathe productive and your results looking sharp. Review: Not worth the money! - Whomever made this piece of tooling must have skipped the bulk of their schooling. They laid out the tool in such a manner that the cutting bit does not align with the actual centre of the yoke resulting in a substantial misalignment of the cutter bit as it swings in the yoke. Completely useless since nearly 1/4” or 5mm of useful space has been lost which prevents the tool from being properly centred on the work. The work in the photos is only 23 and a bit mm in diameter. QUALITY CONTROL during manufacture and testing of these would have gone a long way since the tool would otherwise have rated 5 stars. Review: If you need small balls, this WILL make them! - The replacement for the first tool (received without a cutter bit) was complete. After I insured all screws were tight, I attached it to my lathe using a quick-change tool holder. First thing I tried was to simply turn a rounded end on a piece of Delrin plastic. It took a bit to get used to the process, but I turned a very nice half round onto the end of the plastic. I then chucked up a short length of 1/2" aluminum rod. I insured the rod end was far enough out of the chuck that the tool would not impact the chuck jaws in use. I undercut a length of the shaft from about 1/2" from the end of the rod back about an inch and turned that down to roughly 1/4 diameter. Then I set the tool horizontal to the work, touched off at the dead center of the rod. I moved the cross feed out far enough that the cutter was clear of the work. I then started the lathe and moved the bit in until it made contact with the right hand end of the work. I swung the handle left and right and knocked the edges off the work. I advanced the tool and swung the handle between the center of the end of the rod and back as far as it would go - that is, until it struck the undercut section of the rod. I continued advancing a little at a time until I was cutting the entire surface of the nicely-forming ball on the end of the shaft ! Once I had tool cutting during the entirety of the swing I stopped cutting and polished the ball and shaft with 400 grit sandpaper. The result a smooth, shiny ball about 3/8" diameter. I hadn't measured anything exactly in this test, just wanted to see if it worked. IT DOES!! Feed slowly and use enough speed to prevent chatter. I think this will work for all the small projects I may want balls for. I will try drilling and tapping the next one with 1/4-20 thread so I can screw it onto a "handle" - this is still test, try, learn mode. But think it will get lots of practical use in the future. ## Features - Precision Radius & Ball Turning: Machine Smooth, Accurate Concave And Convex Profiles On Your Mini Lathe—perfect For Knobs, Domes, Handles, And Custom Metal Shaping. Add To Cart To Upgrade Your Turning Accuracy Today. - HSS Or Carbide Options: Choose From High-speed Steel For General Turning Or DCMT11T304 Carbide Inserts For Heavy-duty, High-precision Cutting. Select Your Variant And Order Now For Better Performance. - Fits 7x14 & 7x16 Mini Lathes: Designed For Compatibility With Popular Hobby And Professional Mini Lathes, Ensuring Quick Setup And Consistent Results. Make Your Lathe More Capable—buy Now. - Multiple Size & Radius Options: Available From 3/8" Shank Tools To 65 mm Max Radius Attachments To Suit All Turning Needs. Pick The Right Size And Start Machining Perfect Spheres. - Durable Construction: Built For Repeated Workshop Use With Long-lasting Materials That Maintain Accuracy Over Time. Get Reliable Performance—add To Cart Today. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Assort Machine Tools Co. | | Part Number | ALRTA-19 | | Package Dimensions | 16 x 9.7 x 4.19 cm; 255.15 g | | Item model number | ALRTA-19 | | Size | 3/8" HSS Shank | | Colour | Black | | Finish | Epoxy Black | | Material | Tool Steel | | Power Source | hand_powered | | Item Package Quantity | 1 | | Handle material | Tool Steel & Aluminium Cap | | Included Components | 1 ball turning | | Batteries included? | No | | Batteries Required? | No | | Item Weight | 255 g | ## Images ![Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes - Image 1](https://m.media-amazon.com/images/I/51rStJc3mAL.jpg) ![Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes - Image 2](https://m.media-amazon.com/images/I/61Ett7VlaHL.jpg) ![Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes - Image 3](https://m.media-amazon.com/images/I/61Szu7x5RML.jpg) ![Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes - Image 4](https://m.media-amazon.com/images/I/61bg8mVLZjL.jpg) ![Radius & Ball Turning Attachment for Mini Lathes – Precision Concave/Convex Turning Tool HSS & Carbide (DCMT11T304) Options Fits 7x14 & 7x16 Lathes - Image 5](https://m.media-amazon.com/images/I/61s89r7dXvL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐ Not worth the money! *by S***N on 4 October 2025* Whomever made this piece of tooling must have skipped the bulk of their schooling. They laid out the tool in such a manner that the cutting bit does not align with the actual centre of the yoke resulting in a substantial misalignment of the cutter bit as it swings in the yoke. Completely useless since nearly 1/4” or 5mm of useful space has been lost which prevents the tool from being properly centred on the work. The work in the photos is only 23 and a bit mm in diameter. QUALITY CONTROL during manufacture and testing of these would have gone a long way since the tool would otherwise have rated 5 stars. ### ⭐⭐⭐⭐ If you need small balls, this WILL make them! *by K***R on 1 August 2023* The replacement for the first tool (received without a cutter bit) was complete. After I insured all screws were tight, I attached it to my lathe using a quick-change tool holder. First thing I tried was to simply turn a rounded end on a piece of Delrin plastic. It took a bit to get used to the process, but I turned a very nice half round onto the end of the plastic. I then chucked up a short length of 1/2" aluminum rod. I insured the rod end was far enough out of the chuck that the tool would not impact the chuck jaws in use. I undercut a length of the shaft from about 1/2" from the end of the rod back about an inch and turned that down to roughly 1/4 diameter. Then I set the tool horizontal to the work, touched off at the dead center of the rod. I moved the cross feed out far enough that the cutter was clear of the work. I then started the lathe and moved the bit in until it made contact with the right hand end of the work. I swung the handle left and right and knocked the edges off the work. I advanced the tool and swung the handle between the center of the end of the rod and back as far as it would go - that is, until it struck the undercut section of the rod. I continued advancing a little at a time until I was cutting the entire surface of the nicely-forming ball on the end of the shaft ! Once I had tool cutting during the entirety of the swing I stopped cutting and polished the ball and shaft with 400 grit sandpaper. The result a smooth, shiny ball about 3/8" diameter. I hadn't measured anything exactly in this test, just wanted to see if it worked. IT DOES!! Feed slowly and use enough speed to prevent chatter. I think this will work for all the small projects I may want balls for. I will try drilling and tapping the next one with 1/4-20 thread so I can screw it onto a "handle" - this is still test, try, learn mode. But think it will get lots of practical use in the future. ### ⭐ Not worth the money *by A***R on 3 May 2024* This part is made in India and is a very sloppy fit. Chattering is a huge problem even for a small radius, you end up filing the part to to have any kind of half decent finish. Cutting tool is too long and does not allow you to cut a full radius unless you flip the cutter upside down and cut from the back side of the part. Essentially this is a poorly designed copy with bad build quality. ## Frequently Bought Together - Assorts Radius Ball Turning Tool for Lathe 3/8" Shank with HSS Tool Bit - 7 Pieces Center Drill Bits Set, M2 High Speed Steel 60-Degree Angle Center Drill Bits Kit Countersink Tools for Lathe Metalworking Size 1.0 1.5 2.0 2.5 3.0 4.0 5.0 - Mini Parting Tool Cut off Holder with 6Pcs HSS Blades for Mini Lathes 8mm Shank --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ec/products/408202844-radius-and-ball-turning-attachment-for-mini-lathes-precision-concave](https://www.desertcart.ec/products/408202844-radius-and-ball-turning-attachment-for-mini-lathes-precision-concave) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-07-20*