How much float on floating brake rotors?

[running man]

This year our team is changing to floating rotors and I am wondering how much axial and radial float teams have been using to float their rotors? Have any teams experimented with different amounts of float, or had any problems caused from an excessive amount of float? I have heard of rotors having in the region of 0.5 to 1 mm, but I don't know if this sounds right.
Thanks.

[Mi_Ko]

How much float?

How tight are your tolerances??

[madman]

Based on what an Auto-brake engineer told me:
axial float: 0.4 mm
radial float: 0.2 mm

I'm pretty sure Carol Smith also gives a figure somewhere, but I can't remember - check www.stoptech.com (http://www.stoptech.com) - its in those evil, outdated imperial units. http://fsae.com/groupee_common/emoticons/icon_wink.gif

Mi_Ko's comment on tolerances is very valid - you could lose (or double) all your float very easily.

Have fun and good luck.
Brian

[Mi_Ko]

I researched a bit on this topic. Maybe this shall help:

Apracing about Float (http://www.apracing.com/car/brakedisc/float.htm) http://fsae.com/groupee_common/emoticons/icon_smile.gif

[DanO]

Just whatever you do, dont tell the design judges you have a rotor/pad coefficent of friction of 1.4.

Especially when you in the design semifinals tent!

[Grover]

Your rotor float should be decided upon based on the amount of pad wear you expect to see during the event.