Good metal worker in london?

[Deleted member 4366]

Yes, Nike have adopted it now with a slightly different angle, presumably because it's a good motto. The idea with the Toyota one was that you shouldn't discuss the different ideas until after you had tried them. After you tried them you had learnt something: - what worked and what didn't and what was the best. Then, at your management meeting you only had to report that you had improved something and what you had learnt. Saved an awful lot of time.

 

[cwah]

Just posted it. Thanks and love you all!!

 

[wurly]

I think the Nike 'just do it' picture Scotty posted has a whole different meaning.

I'm a great believer in long management meetings as it happens, it keeps manager types and junior executives away from us peasants doing the work.

 

[jerrysimon]

Just posted it. Thanks and love you all!!

Did you remove the rear frame or post the whole bike ?

I have a PDF with details and instructions of how to remove the rear triangle frame, fit the replacement bushes and refit it back onto the main frame. This is a work round using a standard tap rather than the £200 tool that Brompton recommend.

PS I would have posted this sooner, but I just came out of a four hour management meeting. The joke is it is not finished and starts again at 9:00am tomorrow finishing at 12:00. That's a seven hour meeting!

The good thing is that rather than driving from Cambridge to Oxford for the meeting, I opted to attend via VC. The advantage is you can hit the mute button when you get fed up with the same people wittering on

The bad news is I do not get an overnight stay and an evening down the pub.

Regards

Jerry

 

[cwah]

I already sent the bike with the motor Jerry. Somehow this is maybe better because it's easier to see if it folds correctly once widened.

Thanks for your help Jerry and a special one for John

 

[johnc461165]

No probs mate

If any of you guys search "Brompton rear forks" images on Google you will see that the bends in the forks close to the dropouts are original bends and not as a result of cwah trying to open them up. However if the crossmember needs to be cut and rewelded that will be done as I have welding gear, I am confident that I have a clear understanding of what is required and I will be treating them better than if they where my own. I worked for ICI explosives for 30 years and ended up as senior mechanical technician so I don't see this as a major problem.

 

[flecc]

I worked for ICI explosives for 30 years

I know cwah wanted the forks widened, but don't you think this is a bit drastic?

 

[Scottyf]

I can't see John struggling with this at all to be honest.
Even if he does use explosives ;-)

This is the bonus I guess of the steel frames, much easier to manipulate it for modification.

Even gives you a chance to rub the frame completly down and respray it. Really show that £200+ bike some love ready for the summer coming up.

If you dumping 1000w through It i'll be impressed if you stay on it...

 

[cwah]

Yeah I trust in John too.

Actually I may dump 2000W on it during start (hope the motor is not going to melt) but I may stay far below 30 mph. maybe around 22-25mph so little less than 1000W continuous.

I'm now thinking about also getting the BPM (so long to wait for the BPM2 ) if I don't need to get 650+RPM continuous.

Maybe finally I'll get an ebike as fast and torquy as a standard bike, but that can be hidden under a restaurant table and carried inside shopping center.

Thanks John

 

[eddieo]

Actually I may dump 2000W on it during start (hope the motor is not going to melt) but I may stay far below 30 mph. maybe around 22-25mph so little less than 1000W continuous.

On a likle weak bike with 16 inch wheels.......I will get my black suit and tie down to the cleaners

 

[cwah]

Actually smaller wheels bike are more stable than big wheels. Problems are more on potholes at higher speed but I'm not sure at what speed I'm confortable yet.

On my actual 26" mountain bike, I'm at 22mph but I'd like to go faster and I'm highly missing the acceleration. Will see how it goes on smaller bikes.

 

[Scottyf]

Captain Chaos Cwah!
30mph on this...

I'd suggest a full face helmet and some body armor.

First corner you power out off your going to be on your bum unless you put the batteries at the front of the bike.

At 66v and 30amp my bike wheelies and thats running 700c wheels in a hardtail frame thats huge. thats a good 2300w dumped into it.

So dodgy I never run it at that any more. Back down to 44v for me and 20-25mph much more managable.

Just make sure you fit some good brakes to it. Or an airbag suit ;-)

 

[Scottyf]

Actually smaller wheels bike are more stable than big wheels

Really?
Whats the basis of this larger wheels are better for straight line stability.
Smaller wheels give better turn in ability.

Look at motorbikes. They change profiles and sizes by an inch in racing to get the better handlnig and straight line performance on desired tracks.

 

[cwah]

Zombiess in endlessphere has a small wheel bike at 70 mph. He says it was more stable than full sized bike. But I don't have scientific basis to support that.

I'll probably cycle around 20-25mph max, the problem is that I don't know at what speed I'm comfortable. So better plan for "more" and don't use the full power than planning for "less" and having to change the whole setup if that's not right.

I also have a "small" direct drive motor now, so torque and acceleration is not going to be as good as a geared motor.

 

[Deleted member 4366]

.

At 66v and 30amp my bike wheelies and thats running 700c wheels in a hardtail frame thats huge. thats a good 2300w dumped into it.

So dodgy I never run it at that any more. Back down to 44v for me and 20-25mph much more managable.

I have to agree, I ran my 26" mountain bike at 50V and 40 amps, which is about 2KW and it was unmanageble at low speed because the back kept trying to overtake the front and would spin-out at the slightest provocation causing a high-side. It was very difficult from a standing start because I got instant full power, so I had to pedal a bit to get it going before switching on the power.

 

[cwah]

Is there a way to prevent the wheelies? for example if I completely bend my body to the front, lower the seat and put the batteries and locks on the front?

 

[Deleted member 4366]

Is there a way to prevent the wheelies? for example if I completely bend my body to the front, lower the seat and put the batteries and locks on the front?

You need an electronic throttle interface, which stops full power when you open the throttle. The guys on ES have made various solutions, but there's none that you can buy. I seem to remember some new functions for the Speedict coming: Was throttle ramp one of them? Ideally, the number of amps needs to be limited by speed, so that you maybe have a max of 10amps until you get to 10mph and then ramp it up with speed, but for that you need to program a microprocessor. Another way is with a current control controller as opposed to the normal speed control. The Cycle Analyst and the Speedict can both simulate current control, which, in theory would be better, but the guys on ES that tried the CA reported unsatisfactory results. Maybe Speedict is better.

 

[cwah]

Ok, I thought the number of amps was proportional to the pressure applied on the throttle..

So even at minimal pressure, it still delivers full amps?

 

[NRG]

Nope, its complicated but in essence the throttle controls the motor volts and therefore the speed using something called pulse width modulation. Motor current or more accurately Phase current is controlled by the set parameters and programming in the controller, the controller current you commonly see stamped on controllers refers to the max. current draw from the battery, the max. phase current will be some multiple of this.

 

[Scottyf]

More volts in essense makes the throttle sensitive.
My throttle can make me roll along nicely at 5mph. Easy enough.
But if I twist it the slightest bit more it dumps 30amps In one hit from the battery. Or 70amp per phase causing the bike to go for it.
My setup in a small wheel at those volts and amps would mean a serious case of the shits followed by a crash.