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by john.whiting
Wed Aug 28, 2013 10:51 am
Forum: Ariel Talk
Topic: Innertires on demand
Replies: 6
Views: 974

Why not a motorbike jacket made from old tubes,instead of sliding down the road,you d bounce to a stop.Could be a new fashion craze.Regards John.
by john.whiting
Tue Aug 27, 2013 10:06 am
Forum: Ariel Talk
Topic: Innertires on demand
Replies: 6
Views: 974

In my day we called them tubes,and old ones were cut up to provide heavy duty rubber bands.Very useful for securing things to luggage racks,handle bars,and rear mudgards.A mate had a crap car(Standard 10) and one of these bands was attached to the gearstick to keep it in top gear.Also very handy for...
by john.whiting
Thu Aug 22, 2013 10:10 am
Forum: Four stroke
Topic: NG cam upgrade
Replies: 15
Views: 2456

Sprues and risers would have to be cut off of course.Regards John.
by john.whiting
Thu Aug 22, 2013 10:07 am
Forum: Four stroke
Topic: NG cam upgrade
Replies: 15
Views: 2456

Investment castings are normally used without any finishing,and can be heat treated just like any other metal item.The turbine blades in jet engines are cast in this way,from various alloys which are nearly impossible to forge or machine.Ariel followers could be cast, the bore for the pivot reamed,h...
by john.whiting
Wed Aug 21, 2013 10:39 am
Forum: Four stroke
Topic: NG cam upgrade
Replies: 15
Views: 2456

Investment casting is the secret.All that's needed is a wax pattern.The casting uses types of alloy steel that flow easily.Various types of stainless are favorites,and also 4140.All the JAP parts you see in these replicas are investment cast.On a production basis ,a method of producing the wax in qu...
by john.whiting
Thu Aug 15, 2013 2:51 pm
Forum: Four stroke
Topic: Side stand
Replies: 9
Views: 1549

Nevs right,the "Jiffy" stand is without a doubt the best sidestand ever made for a bike.The best thing is that you can still buy one ,and I suspect it can be fitted to the front engine plates in the sidecar mount hole on any pre S/A Ariel ,without much trouble.One thing though,dont forget ...
by john.whiting
Wed Aug 14, 2013 9:55 am
Forum: Main Chat Forum
Topic: Lathe quiery
Replies: 8
Views: 1351

Yes ,its best to reduce overhang of the chuck as far as possible.Its allways preferable to thread the inside of the chuck for mounting ,even if you need an adapter to match sizes.If you reverse the chuck,and grip the spindle end,you automatically centre the chuck,and can use your own lathe if you do...
by john.whiting
Tue Aug 13, 2013 12:03 pm
Forum: Ariel Talk
Topic: Gudgeon Pin Circlips
Replies: 6
Views: 968

Most British pistons used spring wire circlips which are far more flexible than flat stamped circlips.The wire circlips sometimes had a tail for gripping with pliers,or sometimes were plain and required a slot in the pin bore. I would think that loose stamped circlips have worn the grooves oversize ...
by john.whiting
Tue Aug 06, 2013 11:18 am
Forum: Four stroke
Topic: BIG END and MAINSHAFT TAPERS
Replies: 4
Views: 928

Any production grinding of shafts and pins since the mid thirties would have been done on a centreless grinder.Once the wheel(s) are dressed to form,grinding a pin would take about thirty seconds.Production rates of 150 pieces an hour are commonplace.In the early eighties,we made production runs of ...
by john.whiting
Tue Jul 30, 2013 10:27 am
Forum: Four stroke
Topic: Sq.4 Lead Bronze Crankshaft Bushes
Replies: 9
Views: 1439

Many old books on engineering practice say " If the bearing should heat(seize in other words),the white metal will run out and free the bearing.A bronze bearing will seize hard,scoring and cutting the shaft.The white metal also allows dirt to embed ,saving the shaft from scoring."This is a...

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