custom mcpherson hub

[tbone]

hi I am in the process of designing a custom drop spindle and need some help on a few things

what grade and thickness of steel should I be using ,my plan is to use 10mm core ten for the main profile and 6mm core ten for the gussets
also I will be moving the steering rack forward do I need to show a drawing for this
Doc3.docx (14.54 KB)Doc2.docx (14.92 KB)Doc1.docx (14.7 KB) drawings shows front ,side ,profiles and bearing case

cheers

[Rob]

Hi

A custom-built stub axle assembly may be fitted to a low volume vehicle provided that it has been individually approved in writing by the Technical Advisory Committee of the Low Volume Vehicle Technical Association (Inc). This is done through the build approval process specified in the ‘Hobby Car Technical Manual, Chapter 4 - Build Approval Process’, prior to the commencement of construction.
Refer the following links regarding this process. You will only need to refer to Form 4b in your case (Page 4.10 and 4.15 in particular). Provide as much applicable information as you can, the more the better!
www.lvvta.org.nz/approvals.html
www.lvvta.org.nz/documents/suplementary_information/Form_4B_Design_Approval_Application.pdf

Requirements also state a custom spindle fitted to a low volume vehicle, that is separate to the stub axle assembly, must:
(a) be manufactured from a high quality low alloy steel; and
(b) incorporate correct machining procedures including maintaining the correct radii at diameter changes; and
(c) be comparable in all critical dimensions to a spindle from a production vehicle of a similar weight as that of the vehicle to which the custom spindle is fitted.

Regarding moving your steering rack forward. The thing to be very careful of here is bump steer. No drawing would be required for this however you will need to satisfy the LVV certifier it is within acceptable limits.
The following link to an information sheet on Bump Steer may provide some assistance here –
lvvta.org.nz/documents/infosheets/LVVTA_Info_04-2010_Bump-steer_Measurement_Background_Information.pdf

I also strongly recommend you purchase a copy of the Hobby Car Manual www.hotrod.org.nz/Merchandise%20Page%20Files/Hobby_Car_Technical_Manual.htm
and talk with your local LVV certifier to ensure all aspects have been covered.

Regards
Rob