krlthms
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| posted on 11/12/04 at 07:20 PM |
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quote:
Originally posted by CooperLight
Yes, the problem is the speed of steppermotor
The (good) switch-shift / paddle shift systems uses electric motors running 30K RPM ...
Stepper motors can be just as fast, for example in hard disk drives.
I have a home built micropositioner at work that uses a stepper motor, with the same lookup table idea. It has no problem switching between points
(even non-adjacent) in less than 50 ms. In fact the limiting factor would be the mass of the system you are trying to move, rather than the speed of
the motor, I think!
For very fast movements we use a galavanometer device, and when we want really, really fast movement (such as scanning laser beams) we use piezo
devices (they can go supersonic).
Cheers
KT
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Crazy Jay
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| posted on 11/12/04 at 09:01 PM |
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Just home from work
That picture is a stuart taylor made paddleshift, was just showin the kind of design i will be going for.
Altho ST use a manual shift im gonna get the electronic system and mount a couple of micro switches. Another difference is im gonna mount the paddle
to my steering boss so it moves wit the wheel 
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Crazy Jay
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| posted on 11/12/04 at 09:03 PM |
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Is it colmaccoll who mentioned he makes the electronic shifters??
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Rorty
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| posted on 11/12/04 at 11:59 PM |
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quote:
Originally posted by Tralfaz
Looks to me like it pivots at centerline. You can see a rod end and control rod attached to the right side.
T
Now that you mention it....
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Rorty
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| posted on 12/12/04 at 12:07 AM |
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quote:
Originally posted by carnut
I'd like to put an electronic shift like 1 of the above on my indy but woud like it to blip the throttle on the way down the gears. Has anyone
done this?
Frequently, ffl free to blip any time you feel like it.
quote:
Also i'd like it to kill the ignition on the way up the gears so i can keep my right foot flat to the floor.
Most electronic shifters come with an ignition interupt as standard.
quote:
Would also be nice if i could have a setting to make the shift occur when a certain rpm is reached.
Some even come with a shift light (only for advising you when to manually change).
If you want a fully automatic shifter, you'll have to spend big.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Rorty
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| posted on 12/12/04 at 12:10 AM |
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quote:
Originally posted by krlthms
It occurs to me that a stepper motor would be a better solution than a solenoid.
Several quads come with "auto" shifters that are controlled with stepper motors. You can also buy an aftermarket stepper motor gear change
kit to fit on a quad, so presumably it would also fit a bike engine sitting in a car.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Rorty
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| posted on 12/12/04 at 12:38 AM |
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quote:
Originally posted by Crazy Jay
Just home from work
That picture is a stuart taylor made paddleshift, was just showin the kind of design i will be going for.
Altho ST use a manual shift im gonna get the electronic system and mount a couple of micro switches.
That makes more sense.
It looks very clumsy. How does it feel? How does it pivot in the centre?
quote:
Another difference is im gonna mount the paddle to my steering boss so it moves wit the wheel.
I designed a paddle shifter for one of my cars which clamps to the steering shaft between the steering wheel and the steering bearing (so it obviously
rotates with the wheel).
It uses 6mm pull rods (or cables, depending on engine orientation) and cable-type balljoints. It "snicks" the box nicely into gear.
I don't have any photos because the people at the factory aren't much use with a camera.
 
Rescued attachment paddle_shiftFSS02.jpg
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Crazy Jay
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| posted on 12/12/04 at 02:27 PM |
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Holy poo thts a nice design!! That is very similar to one of my designs
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Wadders
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| posted on 12/12/04 at 03:47 PM |
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Is the car rack & pinion Rorty? i considered a similar design, but convinced myself it wouldn't work due to the cables getting tangled
etc.
I guess on a buggy there's very little steering wheel turn, lock to lock.
Al.
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Rorty
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| posted on 12/12/04 at 08:06 PM |
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quote:
Originally posted by Wadders
Is the car rack & pinion Rorty? i considered a similar design, but convinced myself it wouldn't work due to the cables getting tangled
etc.
I guess on a buggy there's very little steering wheel turn, lock to lock.
Al.
Yup, R&P with 5/8 turn lock-to-lock.
It will still work OK on a car with more wheel turn, as the cables are only in tension and can therefore be very light weight and flexible.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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paul_mcq
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| posted on 13/12/04 at 10:16 PM |
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heres one for you crazy jay. its a simple design for a shifter for electric shift
[img][/img]
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Crazy Jay
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| posted on 13/12/04 at 10:33 PM |
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nice
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ceebmoj
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| posted on 13/12/04 at 10:49 PM |
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hi,
the plus points of an eletronic system should not be over looked I gues it just comes down to where youer skills are though. as for finding nutral yes
it can be problematic for a basic systems we have dicused hear however if you use any one of anumber other actuators stepper motors, solinoids,
umatics it is an esy problem to solve. for me the advantages come when the system starts to get involfing i.e. if you have a lap memory in youer
system so the car knowes what is coming next and can preper i.e. alowing revs to get slightly hier on one strait to prevent an up shift at the very
end of the stright. alowing pre selection for the down shift in to the breaking zone. equaly fule econimy and engin life/power can all be tuned in to
the system. I gues that this is maby a bit exsesive for a locost however for a track car maby it is wroth it. can you gues what i do for a living?
blake
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paul_mcq
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| posted on 13/12/04 at 11:00 PM |
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[img][/img]
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ZEN
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| posted on 14/12/04 at 12:20 AM |
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Here is a very nice Solenoid Operated Gearshift DIY project
http://biketransplant.tripod.com/solenoid_shift.htm
My YouTube channel Cars, bikes - track days, motorsport, sim racing and more.
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krlthms
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| posted on 14/12/04 at 06:24 AM |
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quote:
Originally posted by ceebmoj
hi,
the plus points of an eletronic system should not be over looked I gues it just comes down to where youer skills are though. as for finding nutral yes
it can be problematic for a basic systems we have dicused hear however if you use any one of anumber other actuators stepper motors, solinoids,
umatics it is an esy problem to solve. for me the advantages come when the system starts to get involfing i.e. if you have a lap memory in youer
system so the car knowes what is coming next and can preper i.e. alowing revs to get slightly hier on one strait to prevent an up shift at the very
end of the stright. alowing pre selection for the down shift in to the breaking zone. equaly fule econimy and engin life/power can all be tuned in to
the system. I gues that this is maby a bit exsesive for a locost however for a track car maby it is wroth it. can you gues what i do for a living?
blake
Would you still need a driver? 
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Mikey G
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| posted on 16/12/04 at 03:02 AM |
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Well this is all great stuff 
For the sake of a few quid i'm going to build a simple control circuit over xmas, then i need to find a solenoid or 2, finally after testing my
system using buttons i'm gonna make a paddle shift of some sort. all in i should be able to do the lot for less than £100 depending on how i
do/make the paddles 
Mike
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Aloupol
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| posted on 16/12/04 at 09:10 AM |
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I checked this site 6 months ago and contacted one of the three guys. He said he wansn't involved in kit cars anymore.
This seems difficult to make work properly even if it looks pretty simple at first sight..
[Edited on 16/12/04 by Aloupol]
 
Rescued attachment Shift electrique.JPG
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locoboy
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| posted on 16/12/04 at 04:49 PM |
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quote:
Originally posted by Crazy Jay
Is it colmaccoll who mentioned he makes the electronic shifters??
Pmsl nope not me, unless i was bladdered and had ideas above my station lol
ATB
Locoboy
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locoboy
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| posted on 16/12/04 at 04:51 PM |
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quote:
Originally posted by Rorty
quote:
Originally posted by Crazy Jay
Just home from work
That picture is a stuart taylor made paddleshift, was just showin the kind of design i will be going for.
Altho ST use a manual shift im gonna get the electronic system and mount a couple of micro switches.
That makes more sense.
It looks very clumsy. How does it feel? How does it pivot in the centre?
quote:
Another difference is im gonna mount the paddle to my steering boss so it moves wit the wheel.
I designed a paddle shifter for one of my cars which clamps to the steering shaft between the steering wheel and the steering bearing (so it obviously
rotates with the wheel).
It uses 6mm pull rods (or cables, depending on engine orientation) and cable-type balljoints. It "snicks" the box nicely into gear.
I don't have any photos because the people at the factory aren't much use with a camera.
Rorty, Does that design mean that when you pull one paddle the other one moves away and vice versa?
ATB
Locoboy
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Rorty
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| posted on 16/12/04 at 08:36 PM |
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quote:
Originally posted by colmaccoll
quote:
Originally posted by Rorty
... clamps to the steering shaft between the steering wheel and the steering bearing (so it obviously rotates with the wheel).
It uses 6mm pull rods (or cables, depending on engine orientation) and cable-type balljoints.
Rorty, Does that design mean that when you pull one paddle the other one moves away and vice versa?
The short answer is yes. In its simplest form, the idle paddle will move forward when the active paddle is pulled.
I did make one where the idle paddle remained stationary, but there were too many parts (too costly) with the propensity for wear and slack in the
system.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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