Tormac 15L CNC lathe
- tags CNC Tool Inserts Turning
- Tormac Lathe tooling guide
- Lathe Tooling basics
- Sandvick Cutting speed guide
- Hard turning
- Horsepower calculations for turning and facing
- LinuxCNC Lathe user
- Quick change tool post Accusize tools QCTP
- Turning Small diameter
- When using carbide tooling you need to have a rigid machine and horsepower to back it. You want to create C shaped chips and not long and stringy chips. The only way to do this with a smaller machine is with a positive tool geometry that minimizes cutting forces.
- The smaller the nose radius the less cutting forces, but its a weaker insert and hard to get good surface finish with it. You want a large nose radius which gives better finish and stronger insert.
- The problem with bigger nose radius is that you need a minimum depth of cut to activate the chip breaker, so you cannot come in with a small finishing pass to clean it up.
- For a 432 insert, 1/2” Inscribed circle, you can go half the IC in radial depth of cut.
- Switching to a smaller IC insert means you can take a smaller DOC. It also saves on the cost of the insert. The closer you are cutting to the insert edge the more efficient it will be. They need a minimum depth of cut to activate the chip breaker.
- Using an insert with a positive geometry means less horsepower required and less cutting forces, but it cannot be flipped over to cut on the other side.
- When cutting harder materials its tempting to use a shallow DOC but this introduces a lot of axial forces into the tool and work resulting in a taper in the finished part. The normal DOC would be the nose radius of the tool.
- Travelling Steady
- Box Tooling for Small diameter turning
Feeds and Speeds
304 Stainless steel 35 deg diamond insert
- 350 SFM / Roughing and Finishing
- Max RPM 2500
Feed- Rough - 0.13mm/Rev (light) Finish - 0.07mm/rev
DOC - Rough - 0.5 mm Finish - 0.13
- 300 SFM
- Max RPM 1000
- Feed - 0.0762 mm/rev
- Cut or surface speed is the velocity at which the material moves past the tool. Represented as both RPM and SFM (Surface Feet per Minute)
- RPM maintains the same revolutions per minute throughout the entire operation.
RPM mode is useful for:
- Center cutting operations (drilling)
- When the diameter at the beginning and end of a cut only differs slightly
- During threading to allow the perfect synchronization between spindle revolution and Zaxis motion to allow precise threads
- Surface Feet Per Minute (SFM) is a combination of the cut diameter and RPM. The faster the spindle turns, and/or the larger the part diameter, the higher the SFM.
- CNC lathes have CSS (constant surface speed) to counteract the natural decrease in surface speed, which speeds up the spindle as the tool moves closer to the turning axis.
- CSS is useful for:
- A uniform surface finish
- When the diameter at the beginning a cut will differ significantly from the diameter at the end of the cut
- Better tool life and machining time because tools will always cut at the appropriate speed
- RPM = SFM x (12/Pi) / Cut Diameter
- for an SFM of 400 and a cut diameter of 5”, RPM can be found: RPM = 400 x 3.82 / 5 = 306 RPM
- Feed rate is the velocity at which the cutter is advanced along the spinning workpiece
- 304 Stainless steel 35 deg diamond insert
- Right, left, neutral, right is the most common used for making general turning and front side shoulder. Left handed for back side turning and back shoulder.
- Used wide inserts for rough turning and smaller inserts for detail works.
Tool Offsets in Fusion
ANSI Tool Holders
- The designations for the seven primary tool styles are A, B, C, D, E, F and G.
Lathe tool types
Tormac 15L CNC lathe lathe plan - 8mm rod with super sharp HSS bit on waterjet or grinding. 8 to 7mm 607 bearings
- tags Tormac 15L CNC lathe CNC MillingTurning Archive ProtoTrak Mill DPMRX2