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Following many requests I am now adding detailed drawings of the Magnabend centreless hinges to this website.

Please note however that these hinges are too difficult to make for a one-off machine..
The main parts of the hinge require accurate casting (for example by the investment process) or machining by NC methods.
Hobbyists should probably not try to make this hinge.
 However manufacturers may find these drawings very helpful.

(An alternative style of hinge which is less difficult to make, is the PANTOGRAPH STYLE.  See this section and this video).

The Magnabend CENTRELESS COMPOUND HINGE was invented by Mr Geoff Fenton and it was patented in many countries. (The patents have now expired).

The design of these hinges allows the Magnabend machine to be completely open-ended.
The bending beam pivots around a virtual axis, typically slightly above the working surface of the machine, and the beam can swing through a full 180 degrees of rotation.

Hinge Assembly and Parts Identification:

Hinge Parts identification

Detailed Drawings:

1. Hinge Plate: Click on the drawing for an enlarged view.
Also you can examine this PDF file: Hinge Plate.pdf, or this Turbocad file: Hinge Plate.tcw
Hinge Plate JPG
Aluminium Bronze alloy AB2 is the material specified for the Hinge Plate.  This material is chosen for its good wear resistance and high strength.

2. Mounting Block:  Click on the drawing for an enlarged view.  
See also these files:
 Mounting Block 2D drawing.jpg,     Mounting Block SketchUp 3D Model.skp,    Mounting Block Tubocad drawing.tcw

Mounting Block
The Mounting Block material is AISI-1045. This high carbon steel is chosen for its high strength and resistance to swaging around the hinge pin hole.
Please note that this hinge mounting block is designed to be stabilised by welding to the magnet body following final alignment .
Also note the specification for a shallow thread within the hole for the hinge pin. This thread provides a channel for wick-in Loctite which is applied during hinge assembly.  (The hinge pins have a strong tendency to work out unless they are well locked in).

3. Sector Block: Click on the drawing for an enlarged view.
See also these files:  Sector Block 2D drawing.jpg,   Sector Block SketchUp 3D model.skp
sector block perspective
Note 1.
Please refer to the 2D drawing for details of the slot.

Note 2.
The Hinge Sector Block material is AISI-1045 steel.  If this part is made by machining (rather than casting) then CS1020 may be used instead.

4. Hinge Pin:
Hardened and ground precision steel dowel pin.

Hinge Dowel Pin
Diameter 12.0 mm
Length: 100mm

5. Hinge Assembly Notes:
Click the image for an enlarged view.

Hinge Assembly Notes
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This page last updated: 5 August 2019