T
Terryc
Guest
BT Humble wrote:
> I was planning to use some 40mm square hollow section for the "boom"
Hmm, I don't have enough practical experience either. I've been looking
for a while and noticed that much of the old stuff used multiple tubes
and a long steering head.
either
> without needing to use complex jigwork.
Lol, tell me about.
It looks to me as though the combination of forward
> angled steering head and trailing front axle mounts (i.e. behind the
> steering head) on the christianiabikes designs is intended to make the
> trike naturally inclined to steer straight ahead, so I'll do that
> too. Using a small amount of positive camber on the wheels (bottoms
> sloped outwards) will help the steering.
That is the crunch. If it self centres, it will be a far easier ride.
you are going to have enough problems thrusting that weight from side to
side.
> also because they have thicker walls and are less likely to
> warp under the heat of arc welding (with a stick welder).
See if you can find some pipe to shoehorn inside. It will help with heat
control. Sadly, I know it is going to be hard as nothing common does
that. I'm probably going to have to get a local guy to turn down some
solid rod for me as my heat control is awful.
The only problem with one piece cranks in this application is that you
are suddenly putting all the weight on them, rather than just the force
on one peddle. That is why I'm saving a longish headstem and fork remnant.
OTOH, they are easy to come buy in rubbish on the foot path, so you can
easily grind the old one off and weld on a new one.
If you hand is steady enough,there are 1.5(?)mm rods about. $56 for a
box which is expensive compared to the yumcha brands. Also requires your
welder to have good low current control (mine doesn't).
>
> If there are proper technical terms that I should be using intstead of
> "boom", "steering head" and "turntable", please let me know. I'm just
> not sure that "headstem" is appropriate in this case. ;-)
Don't ask me, I don't know. In any case I understood you perfectly.
I am still at the planning stage as well as I need to buy a oxy set
kit(<=$400), then get the bottle (~$200 for a fill and $240pa rental =
ouch). so I want to have a pile of projects ready to go so I burn the
gas up fast and get the bottles back fast.
> I was planning to use some 40mm square hollow section for the "boom"
Hmm, I don't have enough practical experience either. I've been looking
for a while and noticed that much of the old stuff used multiple tubes
and a long steering head.
either
> without needing to use complex jigwork.
Lol, tell me about.
It looks to me as though the combination of forward
> angled steering head and trailing front axle mounts (i.e. behind the
> steering head) on the christianiabikes designs is intended to make the
> trike naturally inclined to steer straight ahead, so I'll do that
> too. Using a small amount of positive camber on the wheels (bottoms
> sloped outwards) will help the steering.
That is the crunch. If it self centres, it will be a far easier ride.
you are going to have enough problems thrusting that weight from side to
side.
> also because they have thicker walls and are less likely to
> warp under the heat of arc welding (with a stick welder).
See if you can find some pipe to shoehorn inside. It will help with heat
control. Sadly, I know it is going to be hard as nothing common does
that. I'm probably going to have to get a local guy to turn down some
solid rod for me as my heat control is awful.
The only problem with one piece cranks in this application is that you
are suddenly putting all the weight on them, rather than just the force
on one peddle. That is why I'm saving a longish headstem and fork remnant.
OTOH, they are easy to come buy in rubbish on the foot path, so you can
easily grind the old one off and weld on a new one.
If you hand is steady enough,there are 1.5(?)mm rods about. $56 for a
box which is expensive compared to the yumcha brands. Also requires your
welder to have good low current control (mine doesn't).
>
> If there are proper technical terms that I should be using intstead of
> "boom", "steering head" and "turntable", please let me know. I'm just
> not sure that "headstem" is appropriate in this case. ;-)
Don't ask me, I don't know. In any case I understood you perfectly.
I am still at the planning stage as well as I need to buy a oxy set
kit(<=$400), then get the bottle (~$200 for a fill and $240pa rental =
ouch). so I want to have a pile of projects ready to go so I burn the
gas up fast and get the bottles back fast.