Full 5-axis simultaneous CNC machining on a Hermle C250, programmed in hyperMILL. Aerospace brackets, complex housings, compound-angle pockets, and parts with features on five faces — machined in a single fixture, so every feature shares one coordinate origin and the relative tolerance across faces is the machine's, not the fixturing's.
Three real effects, ordered by how much they matter to a procurement engineer. None of them are about marketing — they're about what shows up in the inspection report and what shows up on the invoice.
A bracket with features on five faces machined in one setup shares a single coordinate origin. Relative tolerance across all features is the machine's positioning accuracy. The same part across five 3-axis setups stacks fixturing error on every face — typically ±0.003" minimum even with skilled setup.
Undercut pockets, compound-angle holes, swept profiles, drafted walls — geometries where a 3-axis cutter physically can't engage the surface at the right approach angle. 5-axis tilts the tool INTO the work. The drawing isn't a request; it's a constraint the geometry imposes.
Impeller-style blading, optical-grade compound curves, turbine geometry — surfaces where the finish quality depends on the cutter staying in continuous engagement at a consistent lead/lag angle. 3+2 indexing gives you stepped facets; 5-axis simultaneous gives you the surface the print actually called out.
The full specification a procurement engineer can use to confirm fit on a 5-axis program in thirty seconds.
We don't put a part on the 5-axis because we can; we put it there because the geometry, tolerance, or finish demands it. These are the families where 5-axis is the right tool.
Features on 4–5 faces, compound-angle bolt patterns, integral stiffeners. Single setup eliminates the multi-fixture stack-up that drifts aero brackets out of spec on a 3-axis.
Continuous swept profiles where 3+2 facets show up in the finish. 5-axis simultaneous with hyperMILL keeps the cutter at the right lead angle for the whole sweep.
Electronics enclosures, optical mounts, and sensor housings with internal undercuts or angled mating surfaces. The cutter reaches in instead of needing a secondary op.
Any part where the print specifies features on all faces except one. One fixture, one origin, one inspection coordinate system — and one CMM report instead of five.
Drafted, angled, or non-orthogonal pockets that a 3-axis cutter can only approximate with stepover. 5-axis follows the actual surface.
Optomechanical curves, surgical-instrument profiles, parts where the surface finish is the function. Continuous tool engagement to 16 µin Ra on aluminum.
True 5-axis simultaneous. The C250 runs full 5-axis interpolation with swivel (B-axis) and rotary (C-axis) — the tool can engage geometry from any compound angle while all five axes move at once. We program 5-axis simultaneous toolpaths in hyperMILL when the geometry calls for it; we run 3+2 indexed when that's the right fit for the part. Two different operations, both supported, picked per job.
Three reasons. First — single setup. A bracket with features on five faces is machined in one fixture, so all features share one coordinate origin and the relative tolerance between them is the machine's positioning accuracy (±0.0005"). Same part across five separate setups on a 3-axis machine stacks fixturing error on every face — typically ±0.003" minimum. Second — tool reach. 5-axis lets the tool tilt INTO undercuts, compound-angle pockets, and swept profiles a 3-axis cutter physically can't reach. Third — surface continuity. Impeller blading, optical-grade compound curves, turbine geometry can be machined with continuous tool engagement rather than stepped 3+2 finish.
23.6 × 21.7 × 17.7 inches (600 × 550 × 450 mm) of X/Y/Z travel, with a ⌀350 mm trunnion table providing full B/C rotation. The envelope covers most aerospace bracket, defense housing, and semiconductor chamber subcomponent work in a single setup.
Most days: 6061-T6 and 7075-T6 aluminum (aluminum is 90% of the shop). Also Ti-6Al-4V titanium, 17-4 PH stainless, 304/316L stainless, MIC-6 cast aluminum tool plate, and 2024 aerospace structural. Other materials on request. Toolpath strategy is tuned per material — chip load, surface speed, and coolant strategy all change between aluminum and titanium.
hyperMILL. It's the CAM platform built specifically for 5-axis simultaneous work — collision-checked tool tilt, optimized lead/lag angles for surface finish, and post-processors tuned to our Hermle's controller. Drawings come in as STEP/IGES/SolidWorks/PDF; toolpaths come out as verified 5-axis G-code.
Hermle C250 machine positioning accuracy is ±0.00024" per VDI/DGQ 3441. Delivered part tolerance on tight features called out on the print and CMM-verified: ±0.0005" (±13 µm). Production typical: ±0.001" (±25 µm). Default when no callout is given: ±0.003" (±75 µm). The single-setup nature of 5-axis means features on different faces share the same coordinate origin — relative tolerance across faces matches feature tolerance, not multi-setup stack-up.
Mitutoyo Mistar 555 CMM with a Renishaw PH10MQ motorized probe — the probe articulates to reach compound-angle features the same way the 5-axis cutter did. Probing strategy is programmed alongside the CAM toolpath so the inspection covers the actual geometry on the drawing, not just orthogonal sample points. First-article inspection reports delivered on request.
STEP, IGES, SolidWorks, or PDF. Highlight the features that require 5-axis if you can — we'll confirm fit, tooling, and lead time. Most 5-axis quotes return within one business day with price, lead time, and any DFM notes worth flagging.
