Re: Front axles

[Viv James TraX Interconnect (Pty.) Ltd]

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.

Rgds to all

Viv James

[Roger Furneaux]

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.

[Bob and Carolyn Grunau]

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.
>
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