CNC Machined Aluminum End Effector Mount Block
End effector mount blocks machined from 7075-T6, with the tool face flat to 0.03 mm and square to the robot flange within 0.05 mm, a dowel pattern at ±0.05 mm, T-slots straight to 0.05 mm and internal relief that keeps the block between 0.9 and 3.4 kg.
- Interface Flat to 0.03 mm
- Dowel Pattern ±0.05 mm
- T-Slots Cut in One Pass
- Weight Relieved Internally
*Send the robot flange drawing and the tool plate pattern. The dowel pair, not the bolt holes, sets the position: a block located on bolts alone will rotate 0.2 mm at the tool tip.
End Effector Mount Block Overview
This block is the joint between a robot wrist and whatever tool hangs off it. Everything downstream inherits its errors, so the two mounting faces have to be parallel and the dowel pattern has to be right the first time.
The block is squared, both mounting faces are machined in one clamping, the dowel holes are bored and reamed, then the T-slots are cut in a single pass per slot before the internal relief is milled out.
7075-T6 Aluminium
7075-T6 is used because the block is a cantilever: every kilogram here costs payload, and the higher strength lets the walls be thinner without the face deflecting under tool load.
6061-T6 or 6082-T6
6061 is chosen where the block is welded or where cost dominates and the payload is small. 6082 is used for European projects that call out an EN material certificate.
Below an 8 mm wall the mounting face deflects under a 20 kg tool and the dowels take the load instead of the face, which is how a block frets loose in service.
End Effector Mount Block Specifications
Milling data for tool adapters, with the face, dowel and slot values that decide whether the tool hangs square.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | End Effector Mount Block / Tool Adapter | Machining Process | 3-Axis CNC Milling, Slotting, Boring |
| Material | 7075-T6 Aluminium | Envelope | Up to 200 × 140 × 90 mm |
| Mounting Face | Flat 0.03 mm, Square to the Robot Flange 0.05 mm | Dowel Pattern | Ø 6 – 10 mm, ±0.05 mm |
| T-Slots | 8 – 14 mm Wide, ±0.05 mm, Straight 0.05 mm | Slot Depth | ±0.10 mm |
| Tool Plate Holes | M5 – M10, Class 6H | Counterbores | Depth ±0.05 mm |
| Wall Section | 8 – 16 mm | Weight | 0.9 – 3.4 kg |
| Cable Passage | Ø 20 – 40 mm, Deburred Both Ends | Edge Break | 0.5 mm, All Round |
| Customization | Vacuum Port, Sensor Bracket, Cable Clamp, Quick Change Plate | Lead Time | 6 – 8 Days Sample, 12 – 16 Days Batch |
| Inspection | CMM Face Flatness and Dowel Pattern, Slot Gauge, Weight Check | Packing | Foam Cradle, Face Protection, Crate |
Key Features of Our Mount Blocks
Two faces in one set-up, dowels reamed, slots cut straight, weight controlled.
Faces Machined Parallel
The robot flange face and the tool face are cut in the same clamping, so parallelism holds within 0.03 mm and the tool does not hang at an angle that has to be taught out.
Dowel Holes Reamed to Size
Location comes from two reamed dowels rather than the bolt clearance holes, which is the difference between a tool that repeats and one that shifts when the bolts are loosened.
T-Slots Cut in One Pass
Each slot is cut in a single continuous pass with a carbide slot drill, so the walls stay parallel to 0.05 mm and a tool plate slides without rocking.
Relieved Without Losing Stiffness
Pockets are milled from the sides, leaving the load path between the dowels intact, which takes 30 % of the weight out without moving the face.
Tool that has to hang square?
Surface Finishes for Mount Blocks
The mounting faces are geometry, the slots are wear surfaces and the outside is cosmetic.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Black Anodizing | Non-reflective on a machine cell | Clear Anodizing | Shows cracks and marks on inspection |
| Hard Anodizing | Wear surface on the T-slots | Masked Dowels | Keeps the location fit |
| Bead Blasting | Even matte before dye | Chromate Conversion | Conductive robot interface |
| Anodizing Build | 15 – 25 µm, Sealed | Laser Marking | Tool number and centre point |
| Face Masking | Keeps the mounting face flat | Cable Grommet | Fitted in the passage |
| Assembly Oil | Light film on the dowels | Cradle Packing | Holds the Block Off the Crate |
*Anodizing grows 15 to 25 µm and lifts a dowel hole off size, so the dowels and both faces are masked, or the block is machined undersize and finished after coating.
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Machining Process for Mount Blocks
The tool face and the robot flange face are machined parallel in one set-up, so the end effector hangs square instead of leaning by a degree.
01. Flange and Tool Review
Check the robot flange, the tool plate pattern and the cable route, then set the dowel positions and the block height from the reach you need.
02. Square the Block
Machine all six faces square, keeping the two mounting faces oversize so they can be finished together later.
03. Machine Both Faces
Face the robot side and the tool side in one clamping, then bore and ream the dowel holes from the same datum.
04. Cut Slots and Relief
Cut each T-slot in one pass, mill the internal relief from the sides, and break every edge before the block is checked.
05. Inspect and Anodize
CMM the faces, the dowel pattern and the slot straightness, weigh the block, then anodize with the faces and dowels masked.
Send the robot flange and the tool plate drawing, and we will quote a block with both faces cut in one set-up.
End Effector Mount Block FAQs
0.05 mm, because both are machined without unclamping. A block that is 0.1 mm out puts the tool tip 2 mm off at 400 mm reach, which shows as a drift in every taught point.
Yes, we machine to the ATI, Schunk or Robotiq interface drawings, including the dowel pattern and the air pass-through, and mark the centre point on the block.
About 30 % by milling side pockets, with the load path between the dowels kept solid. Removing more starts to cost stiffness and the tool chatters under load.
Only if the tool plate is clamped and unclamped daily. Anodized aluminium slots wear 0.05 mm in about 5,000 cycles; a steel insert takes that to over 50,000.
A Ø20 to Ø40 mm passage is bored through the block with a grommet at each end, and a clamp boss is added where the cable leaves the tool.
In a foam cradle with the faces protected, because an anodized face that has rubbed in transit is no longer flat to 0.03 mm at the corner.
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