Scratch build MK IV
- Thread starter RexDanni
- Start date
You don’t ever need to apologize for posting eye candy…Sorry to start this again, but they finally arrived today - I'm a bit proud of them
Davidmgbv8
Supporter
The quality, fit and finish appears superb! Who made them? I do have a question as to what the elongated slots are for and are they a size that is smaller than the pin drive so the pin cannot accidentally go into the slots?
The slotted holes have several functions.
Firstly, they are slightly smaller so that the bobbins only fit into the holes when mounting the wheels and not into the slotted holes. You have recognized this correctly.
Then, of course, to save weight.
The last task is to reduce the contact surface of the rim on the hub. By opening up the contact surface, the contact surface becomes "softer", i.e. the local stresses generated by heat are reduced, which is good against cracking at the holes in the bobbins and the hub.
This can be further improved by using cross-shaped slots.
But I did not do this.
As my tolerance in the area of the bobbins is +0.00/-0.03mm, this would be necessary to be able to carry out a quick wheel change when the car is hot and the new rim is cold.
But I don't need a wheel change under racing conditions.
Firstly, they are slightly smaller so that the bobbins only fit into the holes when mounting the wheels and not into the slotted holes. You have recognized this correctly.
Then, of course, to save weight.
The last task is to reduce the contact surface of the rim on the hub. By opening up the contact surface, the contact surface becomes "softer", i.e. the local stresses generated by heat are reduced, which is good against cracking at the holes in the bobbins and the hub.
This can be further improved by using cross-shaped slots.
But I did not do this.
As my tolerance in the area of the bobbins is +0.00/-0.03mm, this would be necessary to be able to carry out a quick wheel change when the car is hot and the new rim is cold.
But I don't need a wheel change under racing conditions.
