18-11-2018, 05:50 AM
I have just had a look t two chassis in good ,clean condition.
Close inspection would indicate a forging.
The tell -tale signs are :
1/ drawing marks in the vertical plane down the sides of the channels
2/ The product has been trimmed all the way around in a press die to remove the flash from forging operations
3/ part number is crisp and proud of the undersurface which indicates high pressure applied.
Another reason for me would be the fact that the spring mount flange carries a cantilever load of some severity, and yet I have never seen one broken, even though NZ roads were a harsh test in the 1920s. Not something I would cast with my metallurgical knowledge.
That said I believe many other seven components were cast steel - Some of them are:
1/ Steering boxes and side covers in the early thirties (not always though)
2/ Dynamo mount /fan mount castings- coil engine-I have two of these in steel
3/ Rear Axle casing ends - these were originally brazed to the axle tubes but later (33 on -D type ) they were friction or resistance - Butt welded to the axle tubes.
4/ 3 piece rear axle center casings (until the D axle arrived)
cheers Steve H
Close inspection would indicate a forging.
The tell -tale signs are :
1/ drawing marks in the vertical plane down the sides of the channels
2/ The product has been trimmed all the way around in a press die to remove the flash from forging operations
3/ part number is crisp and proud of the undersurface which indicates high pressure applied.
Another reason for me would be the fact that the spring mount flange carries a cantilever load of some severity, and yet I have never seen one broken, even though NZ roads were a harsh test in the 1920s. Not something I would cast with my metallurgical knowledge.
That said I believe many other seven components were cast steel - Some of them are:
1/ Steering boxes and side covers in the early thirties (not always though)
2/ Dynamo mount /fan mount castings- coil engine-I have two of these in steel
3/ Rear Axle casing ends - these were originally brazed to the axle tubes but later (33 on -D type ) they were friction or resistance - Butt welded to the axle tubes.
4/ 3 piece rear axle center casings (until the D axle arrived)
cheers Steve H