YDTech® manufacturer of movable center point FDNC driving pins for face clamping,turning, milling! supplier of custon mmovable center point SB,FSB face drive pins on workholding for drilling, grinding.
In precision turning and grinding, maintaining a consistent machining datum is critical. Traditional fixed‑center face drivers can struggle when workpiece center holes vary in depth, causing axial positioning errors. Movable center point drive pins solve this problem. These pins are used in face drivers where the center point can move axially—most notably in the FSB / SB series and equivalent designs from other manufacturers.
Unlike fixed center designs, a movable center point is not rigidly locked. When the tailstock advances, the movable center pin contacts the workpiece center hole first. As tailstock thrust increases, the center point retracts axially—moving backward into the driver body—while the surrounding drive pins engage the workpiece end face. This sequence ensures that regardless of how deep or shallow the center hole is, the end face datum remains absolutely constant. The clamping force is generated purely mechanically by tailstock pressure, requiring no external hydraulic or pneumatic power.
FSB, SB, FSBR, SBR, FSP, FDNC face driver drive pins,workholding, lathe face drivers
| Series | Center Point Type | Accuracy | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| FSB / SB | Movable center pin | Machining runout: 0.015–0.02 mm - FSB: flange mounting, higher rigidity - SB: Morse taper (MK) or straight shank, quick changeover. | |||||||||
| FSBR / SBR | Movable center pin | Machining runout: 0.01–0.015 mm Optimized for small-diameter workpieces | |||||||||
| FSP / FSPB / SP | Movable center pin | Machining runout: 0.015–0.02 mm Drive disk design, suitable for soft turning or heavy cutting | |||||||||
| FFDNC | Movable center point | Designed for milling applications; compensates centering deviations | |||||||||
This design offers three major advantages. First, constant datum – the workpiece is always located from its end face, not from an inconsistent center hole depth. Second, compatibility – the driver automatically adapts to different center hole conditions without adjustment. Third, high torque transmission – once the pins are embedded, the driver delivers maximum torque for high material removal rates.
We are a specialized manufacturer of movable center point drive pins for all SB‑type and equivalent face drivers. Our expertise covers (FSB, SB, FSBR, SBR, FSP, FDNC), and similar models.
We use premium tool steels (AISI D2, M42, powder metallurgy grades) with precision cryogenic heat treatment to achieve 58–62 HRC hardness, excellent wear resistance, and toughness against impact loads. Every pin is inspected for critical dimensions within ±0.005 mm and verified for smooth axial movement.
- home
- products
- contact
- equipments
- face driver pins
- offset driving parts
- half offset drive pins
- central driver parts
- standard/ Fixed driving pins
- Lowered drive parts
- clockwise driver pins
- counterclockwise driving parts
- full width drive pins
- life driver parts
- chisel-edged driving pins
- floating drive parts
- power-operated driver pins
- hydraulic driving parts
- mechanical drive pins
- SB driver parts
- FFB driving pins
- carbide driver pins
- tool steel S7 driving parts
- changeable pins