CNC Machined Aluminum Gripper Jaw Set
Gripper jaws machined from 7075-T6 as a matched pair, with the grip profile cut to your part model within 0.03 mm, mounting faces flat to 0.02 mm, dowel holes to H7 and the contact face hard anodized with the dowels masked.
- Cut as a Matched Pair
- Grip Profile to Your Part Model
- Dowel Holes to H7
- Hard Anodized Contact Faces
*Send the part STEP file and the gripper drawing. The jaw opening and the grip depth come from the gripper stroke, and a profile cut 0.05 mm deep will mark a polished part on every cycle.
Gripper Jaw Set Overview
A jaw pair is a mirror image, and the two halves have to agree: if one profile is 0.05 mm shallow, the gripper pulls the part to one side and the robot repeatability is lost before the jaws wear.
Both jaws are cut from the same billet and programme, the grip profile is finished with a small cutter to follow the part radius, then the pair is measured against each other and the dowels are reamed before anodizing.
7075-T6 Aluminium Block
7075-T6 is used because the jaw section is thin at the grip and has to resist bending every cycle. It also hard anodizes to a surface that does not gall against a machined aluminium part.
6061-T6 or 6082-T6
6061 is chosen for light-duty jaws on plastic parts, where a softer contact face is an advantage. 6082 is used when the jaws are also the fixture and see cooling fluid every day.
For glass or painted parts, the jaw is machined 0.2 mm under the part profile and a bonded rubber pad takes up the difference; metal-to-metal contact will mark the part.
Gripper Jaw Specifications
Milling data for matched jaw pairs, with the profile, match and dowel values that keep the gripper repeatable.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Gripper Jaw / Robot Finger Jaw Pair | Machining Process | 3-Axis CNC Milling, Profiling, Boring |
| Material | 7075-T6 Aluminium Block | Envelope | Up to 160 × 80 × 60 mm per Jaw |
| Grip Profile | Machined to the Part Model, ±0.03 mm | Pair Match | Profile Match Within 0.02 mm |
| Jaw Flatness | 0.02 mm on the Mounting Face | Dowel Holes | Ø 4 – 8 mm, H7 |
| Mounting Holes | Counterbored, Position ±0.03 mm | Jaw Opening | Set by Your Gripper Stroke |
| Contact Face | Serrated, Smooth or Rubber Bonded | Edge Break | 0.5 mm, No Burr on the Grip Face |
| Jaw Hardness | Hard Anodized 350 – 450 HV | Grip Depth | 2 – 25 mm, Cut to the Part |
| Customization | V-Groove, Radius Nest, Sensor Pocket, Part Ejection Slot | Lead Time | 4 – 6 Days Sample, 10 – 14 Days Batch |
| Inspection | Profile Projector, CMM Pair Match, Dowel Pin Fit | Packing | Pair Boxed Together, Foam Separated |
Key Features of Our Jaw Sets
Cut from one programme, matched to 0.02 mm, masked at the dowels.
Pair Cut From One Programme
Both jaws come off the same toolpath with the mirror applied in CAM, so the grip profile matches within 0.02 mm and the part is not pushed sideways.
Profile Follows Your Part Model
The grip is programmed from the STEP file, not from a nominal radius, which stops point contact on a curved part and the marks that come with it.
Dowel Holes Reamed to H7
Location is by dowels rather than screws, so a jaw can be swapped and the gripper still closes in the same place without re-teaching the robot.
Contact Face Finished Last
The grip face is the last feature cut, after all the mounting work, so it cannot be damaged by clamping or by a drill breaking through.
Jaws that have to grip without marking?
Surface Finishes for Gripper Jaws
The contact face determines grip and marking, the mounting face determines location, and they are finished differently.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Hard Anodizing | Wear resistance on the contact face | Black Anodizing | Standard machine finish |
| Masked Dowel Holes | Keeps the H7 location after coating | Bead Blasting | Even matte before dye |
| Rubber Bonding | Grip on glass or painted parts | Laser Marking | Jaw number and pair serial |
| Anodizing Build | 25 – 50 µm on Wear Faces | Bead Blast | Before Hard Anodizing |
| Dowel Plugs | Removed After Coating | Pair Serial | Marked Inside the Mounting Pocket |
| Assembly Grease | Light Film on the Mounting Face | Protective Wrap | Per Jaw, Pair Boxed |
*Hard anodizing builds 25 to 50 µm and will close a H7 dowel hole. Dowels are masked with plugs, and the grip profile is checked again after coating because the build is not uniform on a radius.
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Machining Process for Gripper Jaws
Both jaws are cut from the same programme and checked against each other, so the grip closes on the part evenly instead of pinching one corner.
01. Part and Gripper Review
Check the part model, the gripper stroke and the mounting pattern, then decide the grip depth and whether a rubber pad is needed.
02. Machine the Mounting Side
Face and machine the mounting face, dowel holes and counterbores first, because everything else is located from that face.
03. Rough the Grip Profile
Rough the grip with a 6 mm cutter leaving 0.3 mm, then semi-finish so the finishing cutter sees an even load around the radius.
04. Finish and Match the Pair
Finish the profile with a 3 mm cutter, measure the pair against each other on the CMM and correct any difference over 0.02 mm.
05. Anodize and Re-check
Mask the dowels, hard anodize the contact face, then re-check the profile and the dowel fit before the pair is boxed.
Send the part STEP file and the gripper mounting drawing, and we will quote a matched jaw pair with the grip cut to your part.
Gripper Jaw FAQs
0.02 mm on the grip profile, measured against each other rather than against nominal. That is what keeps the part centred instead of being pushed to the fixed jaw.
Yes, from a scanned point cloud or a STEP model. Cast parts vary by up to 0.8 mm, so the jaw is usually cut to the nominal model with a 0.3 mm relief where the casting is inconsistent.
It adds 25 to 50 µm per surface, which tightens the grip by that amount. Jaws for precision parts are machined undersize, coated and then finished, or the dowels are masked and the profile is left uncoated.
A bonded rubber or PU pad, or a larger contact radius. Metal on metal at 0.5 MPa contact pressure leaves a mark on anodized aluminium within a few thousand cycles.
Yes, a pocket for a proximity or Hall sensor with a 0.5 mm wall is machined in the same set-up. The pocket is kept out of the grip zone so swarf cannot collect in it.
About 500,000 cycles on a clean aluminium part with hard anodized faces, and about 150,000 on a cast part with sand still on it. The dowels usually outlast the grip face.
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