Drill Chuck Assembly: Jaw Alignment and Run-Out
How a drill chuck assembly line is specified: jaw alignment, sleeve thread, run-out at the tip, and what a run-off checks before the line ships.
How a drill chuck line is specified
Four things decide the line: the chuck sizes to be covered, the jaw type, the sleeve thread standard, and the run-out you allow at the tip of the shank. Everything else — station count, cycle time, fixture layout — follows from those four. A line built around one size will not cover a range unless the frame and control were chosen for it from the start.
Station sequence
Body, jaws and sleeve are loaded onto vibration discs, then carried by jigs through pushing and rotary cam stations. The jaws are set against a shank gauge before the chuck leaves the station, so the closing position is measured on something that represents a real drill shank rather than on the jaw itself. Unload and pack follow.
On our drill chuck machines the 6 mm, 10 mm and 13 mm chucks in 20UNF and 24UNF share one frame and one control, with eight die-steel jigs carrying the parts. A new size is a jaw set and a fixture change, not a new machine — which is why the size list matters at quotation, not after the build.
What decides reject rate
- Jaw alignment. Jaws that do not close evenly grip the shank on two jaws and let it sit off centre. It shows up as run-out at the tip, not as a visible defect.
- Sleeve thread. A burr or a tight spot in the thread makes the chuck feel stiff and changes how far the jaws travel for a given turn.
- Gauge wear. The shank gauge is the reference, so a worn gauge quietly shifts every chuck that follows it.
- Cam timing. If the pushing and rotary cam stations are not in step, the jaw is set while the body is still moving.
What we need from you
- Chuck drawing or STEP file, with the jaw and sleeve as separate parts if you have them
- Jaw type and the thread standard (20UNF, 24UNF or your own)
- The run-out limit at the tip, and how your customer measures it
- Target cycle time, annual volume and shifts per day
- Whether one line must cover several chuck sizes
How the project runs
Quote from drawing, tooling design, build, then run-off with your own chucks and shanks in our plant in Chashan, Dongguan. The drawing set is agreed before metal is cut. Machines are built and run off in our 5,000 m2 plant, with two years warranty.
Send a drawing to [email protected] or call +86-18123647785. Related lines: bearing assembly machines, O-ring assembly machines.
Machines for this part: Drill Chuck Assembly Machine — the models we build, with station count and cycle time per line.
Send the drawing for this line. We come back with station layout, cycle time and price.
A quote normally takes three working days once the part information is complete. If something is missing we tell you which drawing is needed instead of guessing a price.
- 012D drawing or STEP file, and the sub-parts
- 02Material and surface finish of each component
- 03Target cycle time, annual volume, shifts per day
- 04The defect you cannot ship — leak, torque, appearance
- 05Bottle neck thread or mating part