Inducer Machining
We machine pump and compressor inducers with long, helically wrapped vanes complete from bar or forging. Small inducers run on our 9-axis mill-turns, larger ones on simultaneous 5-axis.
Short answer: Yes, JEP Manufacturing machines inducers for pumps, turbopumps and compressors. We turn and 5-axis mill them complete, often in one setup on a 9-axis mill-turn. We work in stainless steel, Inconel, titanium and aluminum, from prototype to production.
What is an inducer?
An inducer is the spiral-vaned stage at the inlet of a high-speed centrifugal pump or compressor. It has a few vanes that wrap a long way around the hub. Its job is to raise suction pressure gently so the main impeller behind it doesn't cavitate. That lets pumps run faster and smaller. This is why inducers are standard in rocket-engine turbopumps, cryogenic pumps, high-speed process pumps and some aircraft fuel pumps.
Inducer performance depends on vane thickness, wrap angle and leading-edge shape. The machined part has to match the hydraulic model closely.
| Inducer machining capability | |
|---|---|
| Process | Turn + 5-axis vane milling, complete in one setup where the size allows |
| Machines | Mori Seiki NT1000 (×2) and NT4200 DCG 9-axis mill-turns · Kitamura HX500 5-axis |
| Size | Mill-turn to Ø14.5 in (NT1000) / Ø26 in (NT4200) · 5-axis to Ø31.5 in |
| Features | Helical wrapped vanes, swept leading edges, hub and shroud profiles, bores, splines, threads |
| Materials | 17-4 PH, 13-8, 316L, Inconel 718, Ti-6Al-4V, 7075 aluminum |
| Quantities | Prototype through production; robot-tended runs for repeat work |
One setup, fewer errors
On a 9-axis mill-turn, the bore, hub and outside profile are turned and then the vanes are milled with the B-axis head, without the part leaving the spindle. The vanes stay true to the bore and the rotating axis, which matters for balance and run-out. There is also no second fixture to add error.
For larger inducers we turn the blank first, then machine the vanes on the HX500 with simultaneous 5-axis motion.
What to send
- STEP model and drawing
- Material spec and service conditions (cryogenic, high temperature, corrosive)
- Critical features: vane thickness, leading-edge form, bore and balance requirements
- Quantity and required date
Related: Impeller machining · 9-axis mill-turn · Materials
Frequently asked questions
What is an inducer?
An inducer is an axial-flow stage with a few long, helically wrapped vanes, mounted ahead of a centrifugal impeller. It raises inlet pressure enough to stop the main impeller from cavitating. Inducers are used in high-speed centrifugal pumps, cryogenic and rocket-engine turbopumps, and some compressor inlets.
Can JEP Manufacturing machine inducers?
Yes. We machine inducers complete to print. Smaller inducers are often done in one setup on our Mori Seiki NT1000 or NT4200 9-axis mill-turn centers, which have a B-axis milling head. Larger or more wrapped designs run on our Kitamura HX500 simultaneous 5-axis machining center.
What materials are inducers made from?
Common choices are 17-4 PH and 13-8 stainless, 316L stainless, Inconel 718 for cryogenic or high-temperature service, Ti-6Al-4V, and 7075 aluminum for prototypes and low-temperature pumps. We machine all of these.
Why are inducers hard to machine?
The vanes wrap a long way around the hub, are thin at the leading edge, and leave narrow passages. Cutting them needs continuous 5-axis motion with long, slender tools, while holding the vane thickness and leading-edge form that the hydraulic design depends on.
Have a print or a STEP model?
Send it over. We review every RFQ by hand and include a lead time with every quote.