Technical Can I trun spindles down?

Hey guys its getting warm again so im back at my 46 im working on the front brakes, as you can see im doing disc's the spindle is 46 ford truck 3/4 ton I thnk it was, the spindle shaft is 1.33 and the adapter is I.D. is 1.18 call me silly but I doubt that it will grow that much using heat.

So the next thought is can I have the spindle turned or ground? or are they case hardedend for strength? I ran a file on it and it marks it quite easy.

If it comes down to it replacing the spindles will be the route I have to go, my cars may not be prefect but two places I dont skimp in brakes and steering.

You can see where it is meant to pressed on, im no expert but I think even with the adapter heated a 1.18 hole is not going to fit over a 1.33 shaft.

 

Your pic doesn't work for me, but why not have the adapter turned to 1.33 ID.

 

It was my first thought but that would leave it with obly about .30 wall thickness

 

.300" should be plenty stout enough when backed up by the spindle.

 

X2 ^^.
I copy this from another HAMBer post a While back ,
Sorry don't know who,

 

Yes you can turn a spindle down. Fifteen years ago I put a disk brake kit on my Plymouth. The spindle had to be turned down some (I don't remember how much)for an inteference press fit of the bearing adapter. The guy at the machine shop chucked it in his lathe, cut it down, and pressed on the bearing adapter. It's been on there a long time now, no problems.

 

I agree, ^^^^^ tell your machinist you want an interference fit and give him all the pieces.

 

I suppose you could do it either way, but there is a weak link to everything.
Which would you rather have fail, the adapter, or the spindle?

 

Is the adapter one piece, with both bearing seats machined on it?
What does it use for a seal?
What secures the adapter up against the spindle shoulder?

I'd consider modifying the adapter ID and leave the spindle alone.
The bearings are likely a snug slip fit on the adapter OD to allow adjustment.
After the adapter is installed the bearings should still be a snug slip fit, so if the fit between spindle axle and adpater is heavy interference the adapter may may swell up and limit bearing adjust-ability.


The bearing ODs are a thour or a little more interference in the hub to prevent creeping as the load changes direction.

 

Most importantly:
Make sure you duplicate the radius at the end of the turned section, or you will find the weakest link, and polish it in the radius.

 

Thank you guys, you have given me more to think about, I realy dont want to mod the spindle, I may have another thought I will post the idea as soon as I grab some pics,