UBACK® Back-Machining System
Machine hidden rear features without flipping the workpiece. UBACK combines coolant-actuated UX tool-holders with USPOT and UCHAMF inserts for automated CNC back spotfacing, counterboring, chamfering and countersinking.
Reach the back side in one CNC setup.
UBACK uses spindle coolant pressure to control insert deployment inside the UX tool-holder, allowing the cutting edge to pass through an existing pilot hole, open behind the feature, machine the rear face, retract and return safely.
One UBACK platform. Two rear-machining insert families.
Start from the feature you need to produce. The insert series must match the selected UX tool-holder series.
Back Spotfacing & Counterboring
Produce a flat-bottom rear spotface or counterbore through an existing pilot hole. USPOT is a semi-standard solution configured to the required application diameter, corner radius, chip-former and coating.
- Flat-bottom back spotface / counterbore.
- Target ØD tolerance ±0.1 mm / ±0.004″.
- Supports continuous and interrupted-cut applications.
- Maximum standard UX/USPOT envelope up to Ø57.5 mm.
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Back Chamfering & Countersinking
Machine hidden rear chamfers and countersinks with standard 82° or 90° UCHAMF inserts, with special-angle solutions available for customer-specific applications.
- Rear countersinking and controlled back chamfering.
- 82° and 90° standard insert families.
- Special angles available on request.
- Same coolant-actuated UX tool-holder platform.
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Designed to remove extra setups from rear-feature machining.
The UX hydraulic mechanism turns internal coolant pressure into repeatable insert movement, allowing hidden features to be machined from the accessible side of the part.
From pilot hole to finished rear feature.
The folded insert and UX tool-holder pass through the existing pilot hole without cutting.
Internal coolant, emulsion or air activates the hydraulic piston and deploys the insert.
Perform the USPOT counterbore/spotface or UCHAMF countersink/chamfer on the hidden surface.
Stop/redirect actuation according to the programmed sequence, close the insert and return through the pilot.
Series B–G cover pilot holes from Ø8 to Ø25 mm.
Select the UX series from the pilot-hole diameter first. Then verify the requested feature diameter and axial reach against the selected holder and insert family.
| Series | Pilot-Hole Range Ød | USPOT Max ØD | UCHAMF 82° Max ØD | UCHAMF 90° Max ØD | UX Holder Shank |
|---|---|---|---|---|---|
| B | 8–10 mm / 0.315–0.394″ | 23 mm / 0.906″ | 17 mm / 0.669″ | 18 mm / 0.709″ | Ø16 mm |
| C | 11–13 mm / 0.433–0.512″ | 30 mm / 1.181″ | 24 mm / 0.945″ | 25 mm / 0.984″ | Ø16 mm |
| D | 14–16 mm / 0.551–0.630″ | 37 mm / 1.457″ | 29 mm / 1.142″ | 31 mm / 1.220″ | Ø20 mm |
| E | 17–19 mm / 0.669–0.748″ | 44 mm / 1.732″ | 34 mm / 1.339″ | 37 mm / 1.457″ | Ø20 mm |
| F | 20–22 mm / 0.787–0.866″ | 50.5 mm / 1.988″ | 39 mm / 1.535″ | 42 mm / 1.654″ | Ø25 mm |
| G | 23–25 mm / 0.906–0.984″ | 57.5 mm / 2.264″ | 44 mm / 1.732″ | 47 mm / 1.850″ | Ø25 mm |
Selection rules: insert series must match UX holder series; application axial reach must remain within the holder RFC limit. USPOT requested ØD is application-specific; UCHAMF 82°/90° values shown are the maximum standard diameters at the upper pilot size of each series.
Hydraulic insert control using the machine’s existing coolant system.
The UX holder converts pressure through the spindle into controlled insert movement. This makes the system suitable for automated back-machining cycles on CNC machines.
Pressure controls the cutting position.
Built for more than a simple flat rear face.
UBACK supports continuous and interrupted rear-feature machining. For interrupted conditions, use the cooling and cutting-data reductions specified in the Technical Center.
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Programming, cutting data, cooling and insert technology.
Use the shared Technical Center for USPOT and UCHAMF programming sequences, continuous and interrupted-cut guidance, insert replacement, cooling-system setup, coatings, chip-formers and material-specific cutting recommendations.
Built for strength, corrosion resistance and repeatable CNC use.
UBACK UX holders are part of the NOGA MT DURASHIELD tool-holder platform. The holders use corrosion-resistant material and passivation to support demanding production environments while maintaining structural integrity and repeatable insert movement.
Common UBACK selection questions.
What is the difference between USPOT and UCHAMF?
What pressure is required to operate UBACK?
What pilot-hole diameters are covered?
Can UBACK machine interrupted cuts?
Can one UX holder use both USPOT and UCHAMF?
Are the holder and insert sold together?
How do I select the correct UBACK tool?
Can NOGA MT support a special application?
Send the application drawing and let NOGA MT check the complete setup.
Include the pilot-hole diameter, rear-feature geometry, axial reach, workpiece material and available coolant pressure. We can help match the UX holder, insert family and starting cutting data.