Shop · Robotics & UAS Hardware
Custom Gripper Fingers / Jaws
Engineered to hold your part still — the grip stiffness is computed.
Σ reactions balance the clamp load to 0.00% and the FEA tip splay agrees with an independent cantilever hand-calc to 15% — so the stiffness number is trustworthy. The finger grips at 1.8 N/µm and holds the part to 23 µm under a 40 N process load, 4.4× inside a 0.1 mm budget. The grip is computed, then pull-tested.
How we engineered this: a printed finger that holds the part still →
Specifications
| Grip stiffness | 1.8 N/µm (1753 N/mm) at the V-groove |
|---|---|
| Part location under load | 23 µm shift under a 40 N process side-load (4.4× inside 0.1 mm) |
| Tip splay at full clamp | 126 µm at 220 N (symmetric → part stays centered) |
| Strength FoS | 3.9× static; 2.0× fatigue-knocked (cyclic — scoped intermittent duty until a coupon test) |
| Mount | Robotiq 2F-85/140 fingertip pattern (2× M3 + 2 anti-rotation pins) |
| Grip feature | Self-centering 90° V-groove (sized to your part) |
| Material | CF-Nylon · optional TPU no-mar liner |
| Analysis | CalculiX C3D10 FEA, hand-calc-bracketed, equilibrium-verified |
Application and configuration notes
Grip stiffness scales with finger thickness and reach — we re-solve per gripper and part. The V-groove suits round stock; a flat or stepped jaw face is a parameter swap. A TPU grip-pad liner adds no-mar friction but trades a little stiffness at the contact (disclosed). The FEA is the design; a force-displacement pull on the as-built is the deliverable.
Configure to your part
Enter the envelope of the part you need to inspect. We auto-size the 3-2-1 fixture, then run the real FEA to confirm the datum holds before you pay.
Estimate only — every fixture is FEA-validated for datum stability and quoted before work begins.
The part
A custom finger pair for a parallel (two-jaw) robot or pneumatic gripper. Each finger bolts to the gripper jaw, reaches to the work, and cradles round stock in a self-centering 90° V-groove. Gripper fingers are bespoke by nature — they're machined per-part — so this is the engineered alternative, sized to your gripper and your part.
What you're actually buying is grip stiffness. A finger that flexes under clamp lets the part drift, and a part that drifts is a missed pick or a scrapped operation. So we don't guess the finger is stiff enough — we compute it: a finite-element analysis gives the tip deflection under the full clamp load, and from it the grip stiffness, cross-checked against a cantilever hand-calc and balanced to zero.
This finger grips at 1.8 N/µm. Both fingers deflect symmetrically under clamp, so the part stays centered; what matters for precision is disturbance rejection, and a 40 N process side-load shifts the part just 23 µm — 4.4× inside a 0.1 mm budget. It bolts to a real gripper on the Robotiq 2F-85/140 fingertip pattern (two M3 screws plus two anti-rotation locating pins, so it can't rotate about the screws). CF-Nylon for the stiffness, with an optional TPU liner for no-mar contact. Parametric on reach, thickness, and part diameter, so the grip is re-solved for your exact setup.