LOBE 2 20-21

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Re: LOBE 2 20-21

Post by minetymenace »

Ah! The dreaded lurgy! Good English Beat, but I guess you mean closed the boarder with "G"! :ban

The front fame tube seems to split into the two bottom rails fairly high up, any reason for that?
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Re: LOBE 2 20-21

Post by beat »

beat wrote: Tue Feb 16, 2021 8:49 pm I can not reach it as easy because the lurgy has closed the border to D.
hi minety

D = G, - you are right. ( algebra was never my strongest... :lol: )
minetymenace wrote: Wed Feb 17, 2021 9:44 am The front fame tube seems to split into the two bottom rails fairly high up, any reason for that?
two reasons for this:

1. the engine is quite a lot offside in this frame because the chain line on a MX sidecar bike is much offside of the rear wheel already.
( wide tire 120 - 100 - 18. PLUS two cm clearance between tire and chain. )
so, engine front mount is by far not in the center of the single front frame tube ! means, bracket is much easier to do by the two wider bottom rails.

2. I bought 1 Meter of the material for this front fraim build, 60 X 3 mm dimension. 18 cm for the headstock, 37 cm way down, the rest for the upper part. so I simply run out of this tube :laugh :laugh

but the bike is nearly finished, - there is a fuel tank on it......
6 liter Trial Cheney tank
6 liter Trial Cheney tank
ore the original 3.5 liter MX one....
ore the original 3.5 liter MX one....
( guess Eric would not enjoy this much... :oops: )
and the lightweight swing arm bearings....
and the lightweight swing arm bearings....
something the like it will be...
something the like it will be...
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Re: LOBE 2 20-21

Post by FranktheWelder »

Filament wound bushings. Are they used with seals or thrust bearings?

Bronze welding stainless with a torch is normal for sure but requires special high temp flux. I have been TIG welding stainless with silicon bronze since the late 70's but I am unfamiliar with the history of either process.
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Re: LOBE 2 20-21

Post by Momus »

Glycodur flange.jpg
Glycodur flange.jpg (6.39 KiB) Viewed 714 times
Glycodur F series-

I've used these flanged teflon bronze space savers in similar applications.
If you love it, lube it.
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Re: LOBE 2 20-21

Post by Momus »

002.JPG
We sometimes wonder why a certain thing was made the way it was.

Occam's razor usually provides the answer simply and parsimoniously: the available material was used and forced a compromise.

The infamous BSA unit single heavily offset forward engine mount on The Boris Johnson.
There is no way around it.

TIG welded 4130 sheet and tube.
If you love it, lube it.
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Re: LOBE 2 20-21

Post by beat »

FranktheWelder wrote: Thu Feb 18, 2021 1:02 am Are they used with seals or thrust bearings?
sealing will be by AS 35X45X7
for the axial forces I have to brew something own.... <017

the Glycodur F's, - I can not reach it long enough as I like it and the filament wound bushings are more lightweight. :ban
Momus wrote: Thu Feb 18, 2021 4:50 am The infamous BSA unit single heavily offset forward engine mount
Momus wrote: Thu Feb 18, 2021 4:50 am There is no way around it.
but it gos easier by spacers when the two fraim tubes are passing in a wider distance there !
And engine dismantling is easier to do as well when spacers are to both side of the engine mount.

:mrgreen: :mrgreen:
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Re: LOBE 2 20-21

Post by Momus »

beat wrote: but it gos easier by spacers when the two fraim tubes are passing in a wider distance there !
And engine dismantling is easier to do as well when spacers are to both side of the engine mount.

:mrgreen: :mrgreen:
Boris has 5 mm or so spacer allowance at each mount and enough room vertically to pull the head and cylinder. <200
If you love it, lube it.
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Re: LOBE 2 20-21

Post by beat »

frame tubing on the way
Puzzle
Puzzle
with silent blocks in place...
( it is not a exhaust pipe ! )
( it is not a exhaust pipe ! )
but now, I run out of Tubes 33.7 X 2 mm because the lurgy <215


Dummy shock absorber provisorily fit to see where the pipes should go
DSCN2289.jpeg
about the rear suspension:
the Gold Star has a way for the rear wheel of 150 mm, - this 680 er will have a 210 mm rear suspension.
see what is coming out on it...

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Re: LOBE 2 20-21

Post by beat »

working on the swing arm bearing brackets, - the ones will be welded in to the frame, - not the swing arm
weld bushings for filament bearings
weld bushings for filament bearings
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Re: LOBE 2 20-21

Post by FGF »

Hello Beat ,
Nice home made ...
For what classic race do you hope to be ready in 2021 ?
( if the Covid is OK )
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Re: LOBE 2 20-21

Post by beat »

hi Francoise
FGF wrote: Tue Feb 23, 2021 11:42 am For what classic race do you hope to be ready in 2021 ?
I don't think it will be ready for race in 2021.
hopefully it will be on the wheels and completed for testruns by the end of this year.
so, if everithing gos all right, it should be ready for 2022.

our first race with the old Goldstar this season is held on 11.04. in Wohlen CH

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Re: LOBE 2 20-21

Post by beat »

welding the first botom rail tube with " gas inside tube " as well
DSCN2292.jpeg
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Re: LOBE 2 20-21

Post by Mark Cook »

I did wonder if you were purging the tubes, it makes the welds so much stronger. Food grade frame?
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Re: LOBE 2 20-21

Post by Momus »

1" NB pipe, Schedule 5 or 10 by the 33 point something diameter.
If you love it, lube it.
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Re: LOBE 2 20-21

Post by beat »

Mark Cook wrote: Fri Feb 26, 2021 10:04 am I did wonder if you were purging the tubes, it makes the welds so much stronger. Food grade frame?
purging :smile: yes , - we call it " formieren ".
purging the inside with the same gas as for the welder is used, the Argon. give it about 3 liter / minute to flow.
but do not forget: Argon is heavier than Air, so watch out for filling it from the bottom if ever possible.
about food grade, - it is not good enough for a dairy, and I do keep on the cold side of the welding temperature as good as possible.
but this 2 mm tube is difficult to not melting trough in corners and edges, so purging is needed.
bottom rails looking good...
bottom rails looking good...
a triky place: the swing arm bushing brackets
a triky place: the swing arm bushing brackets
done: welded and machined
done: welded and machined
the tubes: yes, 33.7 mm X 2 mm

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Re: LOBE 2 20-21

Post by beat »

this is where it should go...
DSCN2296.jpeg
DSCN2297.jpeg
hold in place for now with some welding dots .


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Re: LOBE 2 20-21

Post by beat »

geting foreward tube by tube...
DSCN2301.jpeg
DSCN2303.jpeg
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Re: LOBE 2 20-21

Post by Ian Hingley »

Hi beat

Is that the wood you need to put under the sidestand of a solo BSA? Guess you can keep it in the sidecar now... :mrgreen:

Cheers

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Re: LOBE 2 20-21

Post by koncretekid »

I used a lot of wood braces when building my land speed bike. It's easy to cut, drill, and attach and is plenty rigid for holding tubing in place for welding.

Image

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Re: LOBE 2 20-21

Post by beat »

yes, - wood everywhere.
DSCN2304.jpeg
DSCN2305.jpeg
Wood is my third hand and my fourth knee as usual on such a project :!: :lol:

As next is the second welding session ahead...
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Re: LOBE 2 20-21

Post by twinshocker »

Wood !
One of the most underrated materials in frame building :thumb
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Re: LOBE 2 20-21

Post by beat »

DSCN2307.jpeg
DSCN2308.jpeg
severel hours of welding....

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Re: LOBE 2 20-21

Post by twinshocker »

Beat, i hope you have kept in mind to get the finished frame out of that room ? :mrgreen:

There is a story in the CCM book "Rolling Thunder" . They have built a sidecar chassis in Shifnal Street and couldn´t get it down the stairs, so they had to cut the brandnew frame in pieces :shock:
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