Sizes and limits
External profiles are produced on the Lorenz SJ 7 and the hobbing machines: internal and external up to 500 mm diameter and module 8, shafts straight or helically cut up to 800 mm long. Internal profiles, splines and keyways are slotted or broached up to 32 mm wide and 200 mm long — including blind slots, and including single pieces, even though broaching is otherwise a production process.
Any profile is possible: spline, involute, or a special form taken from your sample. For profiles with no standard cutter we have the tooling made rather than turn the job down.
The advantage of having both made in one place: shaft and hub are machined to the same dimension and checked together. You do not get a fit that only reveals itself during assembly.
Material
Shafts are machined from a single piece of high-strength steel — not joined, not welded — and then heat treated. Material and treatment follow your drawing; without a drawing we specify both for the actual load case rather than for a production compromise. Teeth are ground on request down to a tolerance band of 0.0025 mm, with a measurement report accompanying the part.
How it works
- Send the drawing or the old part. A broken shaft works as a pattern as long as the teeth can still be measured.
- Determining the profile. Number of flanks, module, pressure angle, tooth thickness and fit.
- Drawing. As a CAD drawing in DWG or DXF format, which you keep.
- Manufacture. Turning, gear cutting, slotting or broaching, heat treatment, grinding on request.
Price and delivery date are in the quotation as soon as we know the profile, the material and the quantity. A figure before that would be guesswork, and guesswork is no help to you.
Typical problems this solves
- The shaft profile is unknown and appears in no standard
- The machine shop can turn the shaft, but nobody can cut the teeth
- Shaft and hub come from two suppliers and do not fit together