Hi Viv and Roger etc,
Yes, Abingdon Spares have the stub axles, supplied by me.
The steel is American/Canadian spec ASTM 4140, HT and SR. This is a very
strong, ductile material and very suitable for stub axles. Yield stress is
129,433 psi, Tensile stress is 142,719 psi, elongation is 18.1% , reduction
is 55.91%, BHN is 293/302. All this according to the material Mill Test
report. I have the chemical analysis if interested, but its a chrome-moly
steel.
The spindles are machined on a CNC lathe and are very highly finished. I
made a change from the standard TC spindle by substituting a 3/4"- 16 TPI
thread on the axle end ( instead of original 5/8" BSF ) , as it seemed to
me to be a much stronger spindle with the better thread. Spindles are LH
and RH threads as original, but you need a 3/4" late TD/TF or MGA set of
front nuts ( not to be confused with balls! ).
I have raced my TC for two years on these spindles with no problem. After
one season racing, my friend Frank Mount removed his stub axles, with my
spindles installed, and I magna-fluxed the spindles. result, AOK.
Trust this helps.
I can supply the spindles if interested, email me for details.
Regards, Bob
; ----------
> From: Roger Furneaux
> To: T-ABCs
> Subject: [mg-tabc] Re: Front axles
> Date: Friday, January 21, 2000 7:25 PM
>
> Here in the U.K. the best stock steel is EN24T (817M40) but Abingdon
spares
> have them on the shelf, CNC machined to a very fine finish. This is far
> superior to the original forged steel, which was probably just a cheap
> carbon steel, not a chrome-moly like EN24. Has anyone ever done an
analysis
> on an original stub axle?
>
> I certainly agree with Bob - taper rollers will outlast baals every time.
As
> to breakages, we have sunk many a pint of Bass or Speckled Hen debating
this
> point. As Viv says, they always break at the root, so maybe taper rollers
> without a spacer allow the thin end to wave around a bit and not snap off
> the thick end. That's a very simplistic view, but until somebody runs a
> computer simulation of the stresses, we will never know for sure.
>
> ocTagonally
>
> Roger Furneaux ("Mad Metrics" always available)
>
> Viv James wrote
>
>
> >1. I am busy replacing the spindles in the front hubs of both
> >my TCs as per Mike Sherrell's drawing. Can someone tell me what
> >grade steel is recommended for this job?
> >
> >2. Thanks for the advice about the spacers. I am also fitting
> >tapered bearings. I will take the advice but I think there is a flaw in
> >the argument. In my youth (1959 or so), I broke 2 spindles and
> >they both snapped right at the root in exactly the same place. I
> >don't think the additional strength derived from the spacer/bearing
> >assembly would have helped this at all.
>
> ------------------------------------------------------------------------
> For the fastest and easiest way to backup your files and, access them
from