13" Cobra Disk Brake Brackets

Does any one on the board know how to use AutoCAD or another program of the sort, my brother in-law who does CAD drawings for an architecture firm is just to busy to make a drawing of my revised brackets. So if any one can help me out ill send you a scan my diagrams.

For those of you who don’t know I’ve been working on a bracket that will enable you to use 13” cobra disk brakes along with 71-73 drum brake spindles. I’ll post a pic of the mach up bracket I made tomorrow, so you all can see what I’ve been up to.

hsr said:

Shaggy,

I have several CAD systems available to me.

Additionally, I work for Ford and have the original CAD data for the F4ZC and F6ZC brake chassis assemblies. This data provides the exact dimensions and angles for the caliper relative to the spindle centerline.

I can put together whatever type of drawing you need.

Can you let me know what your plan is to center the SN95 rotor on the (smaller diameter) '70 hub?

Let me know if you want me to draw something up and/or compare notes.

Thanks,
Jeff

Click to expand...

Whoa If I could look over those CAD drawings to check them against my own that would be awsome.

Thank all you guys for your offers, I don't have time to scan them tonight (chem test tomorrow), but could probably do it tomorrow or over the weekend.

"Can you let me know what your plan is to center the SN95 rotor on the (smaller diameter) '70 hub?"

The short and simple answer is I haven’t found a reason do to anything. That may sound like a stupid answer, but when the smaller hub is pressed up against the rotor it is centered by the studs, and there is no side to side movement what so ever. If I find a need to do anything in the future it won’t be hard to machine a ring to go around the hub that would fill the gap between it and the rotor, but I don’t see a need to do that. I've made a mach up of the bracket; bolted it on along with the caliper and rotor. The clearances seem to be exactly the same as they where on the sn95 spindle and they are consistent as I spin the rotor around. I have altered the caliper angel in relation to the center of the hub by 10 degrease from the sn95 spindle for clearance, but this makes no difference for obvious reasons that the caliper must maintain a constant distance form the rotor anyway no mater what position the rotor is in this goes the same for the position of the caliper as long as you rotate it about the center of the hub.

The reasons I used the 70-73 drum brake spindles are simple and key to the design of the system and I really wouldn’t do it with any other spindle. So I'm sorry monk but it really can’t be done "right" IMO with a 67-68 spindle or Granada spindle. The 70-73 spindles (sorry its hard to keep years strait but I believe its 70 - 73) has special properties 1. It has 4 bolt holes on the spindle you can mount a bracket to 2. Its beefier then the other spindles a must for a performance brake kit like this IMO.

Heres some visuals

Any way I guess it too longer to type that response then it probably would have to go over to my moms computer scan the stuff and send it, but now its really getting late and I have a lot of work to do for school.

BTW hsr if you wanted to share those CAD drawings I would be glad to look at them I have AutoCAD 2002 on my computer so I should be able to look at them.