Assembly fixtures for consistent assemblies
Assembly fixtures hold parts in the correct position to each other while they are joined, crimped, bolted or clamped. CAD-IS designs and builds assembly fixtures, joining fixtures and assembly gauges for manual and semi-automated assembly. Using the same approach we also build welding and tack welding fixtures, for example for frames, tube and sheet metal assemblies. Every fixture is a one-off for your assembly, designed and built in-house in Karben near Frankfurt, Germany.
Matched to your assembly sequence
We design the fixture along your work steps: load, join, check, unload. Assembly becomes faster and less error-prone.
Wrong assembly ruled out
Form-fit nests and coding only accept the right part in the right position. Errors are prevented before they happen.
Design and manufacturing in-house
3D design, CNC machining and assembly of the fixture are done at CAD-IS, without external partners, so changes are implemented quickly.
Which assembly fixtures we build
Joining and press-fit fixtures
For pressing in bushes, bearings, pins and sleeves. The fixture guides parts coaxially and supports the part where the force acts.
Crimping fixtures
For crimping sleeves, fittings and connectors onto tubes and hoses. Nests hold the line at the correct position and length relative to the crimping tool.
Clamp fitting fixtures
For fitting clamps, brackets and clips onto lines and assemblies. Stops define the position and orientation of each clamp.
Assembly gauges for line sets
For assemblies of several tubes and hoses fitted together. The gauge reproduces the installation situation. See also tube bending gauges.
Workpiece holders and assembly aids
Holders that keep a part at the assembly station in an ergonomic position, rotating or tilting so that all sides are easy to reach.
Mounting and test plates
Plates on which assembled units are located precisely for testing, for example leak, function or vibration tests. For the leak test itself see leak test fixtures.
Assembly fixtures from our design and production
Design models from our plant. Your fixture is built for your assembly and your workstation.
What we pay attention to
Clear position for every part
Stops, centring pins and form-fit nests define the position of every part. Parts that could be mixed up are distinguished by coding.
Short cycle time
Quick-action clamps, easy loading points and a logical sequence save seconds per assembly, which add up in series production.
Ergonomics at the workstation
We plan working height, reach and view of the joint. Rotating and tilting units make hard-to-reach areas accessible.
Integrated checking
Check pins, presence checks or gauge elements show in the fixture whether all parts are present and correctly assembled.
Variants via change parts
For assemblies with several variants we use interchangeable nests, so one base fixture covers several variants.
Robust for series production
Wear points are hardened and replaceable so the fixture holds its dimensions for many years.
From your assembly to the assembly fixture
Documents and quote
You send a drawing or 3D model of the assembly and describe the assembly sequence. You receive a quote within 24 to 48 hours.
Assembly concept
Together we define the sequence, where parts are clamped and joined, and what the fixture should check.
3D design
The fixture is designed in 3D, with a model review before manufacturing on request. Fixture design is also available as a separate service.
Machining and assembly
All parts are made on our 3-axis and 5-axis machining centres, then the fixture is assembled and set up.
Function test
We test the fixture with your sample parts. An inspection report is available on request.
Adaptation in operation
New variants, design changes or wear: we adapt the fixture, even if it was built by another maker.
Questions about assembly fixtures
What is an assembly fixture?
An assembly fixture holds the parts of an assembly in the correct position to each other during assembly. It makes assembly faster, prevents errors and ensures every assembly is the same.
What is the difference between an assembly fixture and an assembly gauge?
The terms are often used interchangeably. An assembly gauge usually also checks the nominal shape, for example on line sets. A pure assembly fixture only holds and guides the parts.
What do you need for a quote?
A drawing or 3D model of the assembly and a short description of the assembly sequence. Quantity, cycle time and whether parts are joined by hand or with a press are helpful.
Do you build fixtures for presses?
Yes. We build nests and joining inserts adapted to your existing manual, pneumatic or hydraulic press. We do not supply the press itself.
Is there a minimum order quantity?
No. Every assembly fixture is a one-off. We also build several identical fixtures for parallel workstations.
Can existing fixtures be rebuilt?
Yes. For new variants, changed parts or wear we rebuild existing fixtures, including fixtures we did not build. Without documents, we capture the geometry with our measuring arm.
Related services
Assembly fixture inquiry
Send a drawing or 3D model of your assembly by email. You receive a quote within 24 to 48 hours.