The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: Roadrocket649 on 13.01. 2011 08:03

Title: Repairing The Butchers work
Post by: Roadrocket649 on 13.01. 2011 08:03
Hi Guys

BSA Super Rocket 1958

One of the previous owners prefered a hammer & chisel to a spanner on this machine
On the rear wheel, the chisel cut is half way through the sprocket side NUT, so I was going to have made,

1.  A new spindle made in stainless steel
2.  A new new nut cut for the sprocket side, also in stainless

Then the thought struck, were these originally made in mild steel, or high tensile steel.

I would appreciate your views on this issue, and whether staineless a good or bad idea

Roadrocket

Title: Re: Repairing The Butchers work
Post by: LJ. on 13.01. 2011 10:10
Oh! I know just what you mean by the 'hammer & chisel' effects and this doe's annoy me. Stilson wenches are also a pet hate of mine. But I'll own up to having done just that on that horrible cush nut, it is so badly knurled over now that an SRM modified replacement is a must. You just can't beat the proper tools for the proper job.

As far as stainless steel goes for the rear end as you mention, I can't see any problem, but then I'm not a metallurgist. Hopefully someone will give you a better opinion.
Title: Re: Repairing The Butchers work
Post by: muskrat on 13.01. 2011 11:03
G'day Roadrocket,
                        try Barleycorn.com for a ss spindle & nut. Some people say no to ss spindles but I'm going to try a set.
Cheers
Title: Re: Repairing The Butchers work
Post by: Roadrocket649 on 13.01. 2011 11:08
Hi Muskrat

Why do they say no to Stanless Steel?
Title: Re: Repairing The Butchers work
Post by: BSA_54A10 on 13.01. 2011 11:18
Lower tensile & shear strengths
A poor understanding of engineering.
Rapid fire cannon barrels are made from the same alloy with 0.05% Va % & 0.1% Ti
Title: Re: Repairing The Butchers work
Post by: Roadrocket649 on 13.01. 2011 11:27
So is the original steel spindle - just mild steel or high tensile?
Title: Re: Repairing The Butchers work
Post by: muskrat on 13.01. 2011 11:48
G'day Trevor,
                  so if I keep an eye on nut tension and don't jump tall buildings all should be good.
Did BSA make those cannon barrels ?
Not sure Roadrocket, if I had to make a set it would be HT.
Cheers
Title: Re: Repairing The Butchers work
Post by: Triton Thrasher on 13.01. 2011 12:18

Rapid fire cannon barrels are made from the same alloy with 0.05% Va % & 0.1% Ti

But they're thicker.
Title: Re: Repairing The Butchers work
Post by: lawnmowerman on 13.01. 2011 12:19
I am not an expert on metallurgy but I have read earlier posts which advise that the nut and spindle are made from different grades of stainless to avoid them "welding" themselves together over time. Also it is vital to use an anti seize product when assembling to avoid this effect as the heat produced in tightening accelerates this effect.
Personally I would avoid it on a rear wheel spindle as the last thing you want is a seized nut by the roadside on a wet and windy night when you are trying to fix a flat.
Jim
Title: Re: Repairing The Butchers work
Post by: andy2565 on 13.01. 2011 12:43
wheel spindles are generaly made from en16 grade,which is much harder than mild steel,i'm never been a stainless person,we would never use stainless spokes etc on our race bikes,its just for bling,keep it the original steel parts for the major parts,i guess its ok for the small parts and the instrument panels,
Title: Re: Repairing The Butchers work
Post by: Butch (cb) on 13.01. 2011 12:45
If you have the parts in your hand you should be able to tell if it's high tensile - it will chime and file differently.
Title: Re: Repairing The Butchers work
Post by: trickytree on 13.01. 2011 17:53
EN16t for spindles.
Title: Re: Repairing The Butchers work
Post by: Roadrocket649 on 13.01. 2011 18:26
Thanks Guys

Roadrocket
Title: Re: Repairing The Butchers work
Post by: Stu55Flash on 13.01. 2011 21:02
Don't know what their made of, but if you look at the BSA film on another thread the wheel spindles look to be forged ('upset') not turned. I'm no expert but are the replacement stainless items forged or just turned? From the adverts they look to be turned not forged. BSA must have forged them for a reason i.e. strength.

Stu
Title: Re: Repairing The Butchers work
Post by: BSA_54A10 on 14.01. 2011 12:08
Contary to popular belief the axle need not be particularly strong and only needs sufficient tensile strength to hold the kit & caboodle together which you could do quite well with a 1/4" standard bolt.
However it dose need to be rigid to the nth degree, hence the forging.
Forging is cheaper than machining if you produce enough to amortize the cost of the die
I have seen race bikes with axels made from tube to reduce the unsprung weight