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RADIUS GRINDING

Radius grinder set up to machine pre-war Aston Martin shoes.

Why Radius Grind Brake Linings?

When brake linings are manufactured, they are made to a set radius to fit the brake shoe and brake drum dimensions. Early brake linings were made from woven material, which was formed to the desired radius. Later linings were moulded oversize and then ground on the inside and outside radiuses to suit. The greater the difference between the outside radius of the lined shoe and the brake drum, the longer the bedding in process will take. The brake will not be fully efficient untill the bedding in process is complete.

With the above in mind, it can be appreciated that any wear on brake shoes or drums will have an effect on the efficiency of the brake. Skimming brake drums is a great idea to get the working surface back to serviceable, but it does change the radius and will effect the initial efficiency of the brake. The longer the bedding in time, the more likely damage to the friction material will occur due to over heating.

The Solution

By radius grinding the shoes to match individual drum sizes, most, if not all, of the discrepancies in size and fit can be eliminated.

This greatly reduces "bedding in" time. For fully floating shoes of a fabricated type, individual shoes can be ground to the drum diameter or mounted on a dummy backplate and machined as a pair. In the case of cam and anchor shoes (pivoted at one end on a fixed point), it is more simple and more accurate to mount these and machine as a pair on their relevent backplates. This will also allow for any discrepancies in the backplate mountings. We can also manufacture dummy backplates to grind shoes given the relevent backplate dimensions.

 

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