Pump Housing Bearing Bore — Drill, Ream, RFQ
The pump housing scrap is not “just aluminum.” Bearing-bore diameter walked because the reamer chased an unknown pre-hole—or the NEV coolant-pump RFQ was answered with a motor-housing essay that never named the pump print.
This page owns pump housing bearing bore finishing: create the hole honestly, control runout and allowance, then PCD-ream when the drawing demands diameter and roundness—including many NEV coolant-pump housings. EV motor-housing bearing detail stays on EV Motor Housing Bearing Bore Finishing. Generic Al housing bearing path stays on Aluminum Housing Bearing Bore Finishing (sibling). XRZ quotes from your pump housing print, Si%, and runout notes (sample validation · Custom Cutting Tool RFQ).
Pump housing bore features
| Feature | What usually drives tooling |
|---|---|
| Main bearing / journal fit bore | Diameter, roundness, alignment → drill → measure → PCD ream |
| Locating / register diameters | Position + fit; ream when gauge requires |
| Inlet / outlet / vent openings | Create-hole + burr plan; ream only when print demands |
| Shaft-sleeve / flange interfaces (boundary) | Soft Shaft Sleeve & Flange Holes—do not own that encyclopedia here |
Do not treat every opening as a bearing finish bore. Soft diagnosis: PCD reamer pre-hole quality.
Drill → ream stack (structure analogy — do not copy #9)
A stable pump bearing-bore stack is usually:
- Create-hole with a carbide drill matched to aluminum/coolant reality — Solid Carbide Drill.
- Measure the incoming diameter band before freezing reamer allowance.
- Finish with a Custom PCD Reamer when diameter, roundness, or finish must hold.
The stack shape resembles EV motor housing bearing work; the part is a pump case—fixture, wall, and oil-path notes differ. Soft decision: Drill-then-ream vs PCD combination. Soft NEV-pump Knowledge (do not restate H2s): NEV pump bearing hole PCD reaming.
NEV / water-pump boundary
| Scene | Routing |
|---|---|
| NEV coolant / electric water-pump housings | Same PCD ream logic when Al-Si + tight bearing bore—still send Si%, allowance, runout |
| Industrial / ICE water-pump housings | Same create-hole → measure → finish path when print demands; material notes may differ |
| EV motor housing bearing | Soft → EV Motor Housing—do not paste that essay |
Through-coolant on the create-hole earns a station when chip packing or deep/blind geometry demands it—soft Helical vs straight coolant holes; do not invent L/D promise bands here.
Soft boundaries
| Page | Owns |
|---|---|
| EV Motor Housing (#9) | EV motor housing bearing |
| Aluminum Housing Bearing Bore (#17) | Generic Al / multi-industry housing bearing |
| Compressor Housing (#15) | Compressor case bore map |
| This page (#16) | Pump housing bearing bore |
Milling supporting only when a face lands on the same print.
RFQ fields
| Must send | Why |
|---|---|
| Pump housing print + revision; critical bearing bores marked | Separates finish bores from clearance |
| Hole chart: Ø, depth, tol, roundness/alignment callouts | Freezes drill vs ream scope |
| Alloy + Si% / process skin notes | Wear discussion—not a life promise |
| Pre-hole method + measured allowance | Incoming band before geometry freeze |
| Holder, stickout, measured runout, coolant (TSC yes/no) | Trial realism |
| Volume band + sample yes/no + written acceptance | First-article before production talk |
Checklist: PCD Reamer RFQ Checklist.
Tool match pointers (short cards)
| Need | Open |
|---|---|
| Bearing-bore finish | Custom PCD Reamer |
| Create-hole | Solid Carbide Drill |
| Soft NEV-pump depth | NEV pump bearing Knowledge |
Is pump bearing-bore finishing the same as EV motor housing bores?
Same stack shape (create-hole → measure → PCD ream) often applies, but the part is a pump housing—fixture, wall thickness, and oil-path notes differ. Motor-specific essays stay on EV Motor Housing. Send the pump print here via Custom Cutting Tool RFQ.
Do NEV coolant pump housings use the same PCD ream logic?
Often yes when the case is Al-Si and the bearing bore is fit-critical—still send Si%, allowance, and runout. Soft depth: NEV pump bearing hole PCD reaming—do not restate that guide here.
What should I mark on a pump housing drawing?
Mark critical bearing bores, hole chart (Ø, depth, tol, alignment), material/Si%, pre-hole/allowance, and which characteristics are in sample acceptance. Upload via Custom Cutting Tool RFQ.
When do I need through-coolant on the create-hole?
When chip packing, blind depth, or interrupted geometry makes dry/flood unreliable on the pilot. Soft coolant geometry: Helical vs straight coolant holes. State TSC yes/no on the RFQ—do not invent a universal L/D rule here.
Send the pump housing print—we’ll map bearing-bore drill → ream
Mark critical bearing bores. Include Si%, allowance, and runout notes—engineering RFQ only.