Motor Bracket, Lantern Type
A lantern bracket: square footprint, four open windows through to the shaft, and a machined register at the hub so the motor lands concentric with the pump.
The windows are there so the coupling can be reached and the seal inspected without pulling the motor. They also take a lot of metal out of the part — 212 × 212 mm across the flanges but only about 1.5 kg, because most of the middle is air.
Everything about this part is alignment. The hub register sets the motor concentric to the pump shaft; the four corner holes set it square to the base. If the register and the mounting face are not cut in the same set-up, the motor goes on cocked and the coupling wears out.
| Envelope | 212.2 × 212.2 × 52.1 mm |
| Cast volume | 204.3 cm³ |
| Weight, grey iron | approx. 1.47 kg as-cast |
| Casting process | Vertical-line sand moulding on two lines (national patent) |
| Materials | Grey iron · ductile iron · WCB carbon steel · CF8M stainless |
| Machined features | Hub register and bore · motor mounting face · four corner holes · pump-side spigot |
| Minimum order | 100 pieces |
| Certification | EN 10204 3.1 per heat, spectrometer results |
| Source of geometry | Your drawing, 3D file or a worn sample |
What Is Difficult About This One
Every casting has one or two features that decide whether the batch repeats. On this part they are these.
Windows cast, not cut
Four openings formed in the mould. Cutting them afterwards would cost more than the casting and leave sharp internal corners.
Spokes carry the whole motor
What is left between the windows is the load path. Sections are kept even so they cool together and do not pull the flange out of flat.
Register and mounting face in one set-up
Both cut without re-fixturing. This is the difference between a bracket that aligns and one that just bolts on.
Alloy Options
The same geometry is a different part in three different plants. Chloride content, abrasion and temperature drive the choice — not the name of the fluid.
| Alloy | Grade | When it is the right choice |
|---|---|---|
| Grey iron | HT200 / HT250 | Default for water duty. Damps vibration, machines easily, lowest cost. |
| Ductile iron | QT450 / QT500 | When the duty is cyclic or the part takes shock. Tougher than grey. |
| WCB carbon steel | ASTM A216 WCB | Higher strength, weldable. For pressure-bearing bodies. |
| CF8M stainless | ASTM A743 CF8M | Chloride and corrosion duty — the cast equivalent of 316. |
What to Send Us
These are the ones specific to this part. A drawing, a 3D file or the worn original covers all of them at once.
| Item | Why it matters |
|---|---|
| Motor frame size | IEC or NEMA frame — it sets the register and the corner hole pitch |
| Shaft centre height | From the bracket foot to the shaft axis |
| Pump-side spigot | Diameter and depth of the register it sits into |
Related Castings
Other parts in the same range — all shown as 3D models you can turn.
