High Quality Models and Accessories

Home | About Us | Hints & Tips | Contact Us | Links
View Basket | Finish Shopping | Your Details


N Gauge
Loco/Coach/Wagons
Station & Trackside
Signals & Jewels
Goods Yard Detail
Street & General Detail
Scene Packs
Road Vehicles
Buildings
Handpainted Models
Materials Handling
Graham Avis Castings
Graham Avis Painted
  Models

OO Gauge
Loco/Coach/Wagons
Station & Trackside
Signals & Jewels
Goods Yard Detail
Street & General Detail
Scene Packs
Road Vehicles
Buildings
Handpainted Models

Search
Product Search

We are currently unable to accomodate personal callers.


P & D Marsh
48 Elm High Road
Wisbech
Cambs
PE14 0DQ

07730 202270

 

Production

Over the years the basic business process has remained unchanged.

To begin you must make or commission an ‘original’ or ‘master pattern’. This is then used to make a production mould from which copies can be cast. The moulds are traditionally made from two discs of black rubber, one of Master mouldwhich has a hole in its centre through which molten metal can be poured.


The ‘masters’ are placed between the two discs which are then put in a special metal casket. This is then placed under conditions of temperature and pressure.


The casket ensures the moulds retain the same external shape but inside the pressure forces the rubber to form around the contours of the ‘masters’.


The temperature causes chemicals present in the rubber discs to react and the rubber ‘vulcanizes’. Basically this means that its physical properties change and whilst it retains a certain amount Mould with castingsof flexibility when it has cooled, it will retain its basic shape.


When the ‘masters’ are removed, the mould retains their shapes within it. Feeds are cut from the central hole in one disc to the cavities left by the ‘masters’ and the mould is then clamped, spun at speed and molten whitemetal is poured into it. This flows through the feeds and fills the cavities taking on the shape of the ‘masters’.


Once cool the castings are removed, checked for defects and then either packed for sale or cleaned prior to painting.



Whitemetal

Whitemetal is the generic name given to alloys compounded of lead, tin and a number of other trace elements present in much smaller quantities.


The precise ratio of lead to tin and the presence, or not, of the other elements determines the precise physical properties of the metal itself.


We select the grade of metal best suited to the manufacture of the type and size of model we are making.


Moulds