[Nonfractal]

This post triggered by a post on slotforum.   
Apologies for the font and sizingi in this post. 
Copying and pasting made a mess. 
https://www.slotforum.com/threads/anyone...st-2598976

Lots of discussion on crowns, nsr crowns and sizing (slot.it vs nsr axles) 

Many wrong assumptions are being made, primarily because the 8689 is hard to buy in the UK
However, 2 racing buddies , known for their "need of the new" , have these cars on import. 

Up close, the transmission is perplexing. 
The motor mount is not identical to the 8689 which is quite a surprise. 

   

The motor position is further forward in the car 
Why?
Can't be to mimic the hourglass rear end of the hybrid f1 cars. 
Nsr f22 is still fat and ugly at the rear. 
So, the motor has been moved forward to maintain the front to rear balance of the 8689. 
I suspect that this will make the car tail end happy, especially with the larger diameter rear wheels.
The NSR promo vid seems to confirm this. 
How have nsr achieved this motor position?
A custom pinion 09 10 and 11 are available.
(Pic from evotecshop.com)
   

The pinion is longer and appears to have a motor spindle extender integral to the design.
The motor spindle extender is made of  brass and appears to be machined as a part of the pinion.

So, a brass spindle extender into a notoriously fragile crown boss?
Intuitively, I suspect that these spindle extenders will wear and fail. 

Additionally, a regular pinion puller will not work on this transmission. 
There is no access to the end of the motor spindle for a regular puller to push against so a regular pinion puller just won't work. 

To tackle this, nsr have created a custom pinion puller for the nsr f22

A special puller just for one car? 

The nsr f22 puller appears to be designed to pull the pinion by pressing against the end of of the motor can. 
Unless I've misunderstood this, the operation of this puller will 
- Press hard on the internal armature spacer 
- risk damaging the spacer and end bearing.
- risk pulling the motor spindle out of the armature stack.

In summary, the nsr f22 transmission is new and an unknown quantity and requires special tools.

If anyone has real life test experience of the f22, please post in this thread. 
AlanW
Link to nsr f22 promo video
https://m.youtube.com/watch?v=kCKJRmR_C0k

[Kevan]

Firstly, if you 'right click...paste as plain text' you won't have size/font issues.

Secondly, I don't like removing pinions by using the can, can end bearing and armature spacer as levers to remove the pinion.

Thirdly, that boss would be the first thing I'd chop off and put a proper spacer on the axle to stop the crown moving sideways.

[beardy56]

The photo shows a pair of axle stoppers, if they are standard why even bother with the boss and just leave the pinion hollow so a normal puller would work. There again NSR do like to sell tools we all really need.

[OXO cube]

The photo shows a pair of axle stoppers, if they are standard why even bother with the boss and just leave the pinion hollow so a normal puller would work. There again NSR do like to sell tools we all really need.

not sure if the motor shaft would be long enough for a hollow / regular pinion 
think that's the real problem , longer motor shaft would have fixed 
but if there's a way to use up old stock + sell new tools in the process , its a win win for NSR 
pretty sure there are 21k long can motors out there with longer shafts 
but that shouldn't have to be a solution to fix a car from a top manufacturer 

Kev

[LMP]

You’ve got to laugh haven’t you. Maybe NSR will realise one day that we’re laughing at them, not with them.

[Kevan]

Long boss pinions is the answer, used them for years on rc cars.

[Nonfractal]

First evidence of motor damage caused by the nsr4105 ( f22 ) pinion puller.
   

Pic from Andy 64483 on sotforum.

The nsr King motors have a closed emd bell bearing so there is no way to know whether you are removing the pinion or pulling the shaft trough the motor, until it's too late.
No way back for the motor in this pic

[Kevan]

This wasn't predicted to happen of course...well not for the first few minutes at least!

...which begs the question ...why didn't NSR foresee this as it was blindingly obvious to a lot of us!

[JMay]

Reading through the posts on both forums and various websites, this looks very much like a project brought to fruition, by a team that worked mostly in isolation until the prototype car was tested on a track…


Track test day Italy, new F1 prototype.

Marketing Manager, ‘Why is it stopped moving? Its only done 10 laps’

Test Engineer, ‘The pinion has come off’

Drive train Engineer, ‘You didn’t push it on far enough’

Motor Engineer, ‘The standard motor shaft is too short to reach the cog and the pinion is hanging too far off the end to stay on the motor shaft’

Body Stylist, ‘Didn’t you all get the email regarding moving the motor back to suit the bodyshell’.

At this point the Engineers depart for a liquid lunch, leaving the Stylist and Marketeer to decide it needs a longer reach toothed thingie with a shaft on the end like the motor has. Returning from an extended lunch session, the most coherent Engineer point out the solution solves one problem but creates two more. Namely a longer closed off pinion where you can’t use a standard pinion puller and any attempt to remove the pinion risks damaging the armature. At this point, as a further delay means launch date is now only achievable via a Tardis, the Marketing Manager is having kittens, until it is realised they can now flog a special tool to remove the pinion and sell more motors...

The above is pure fantasy but you do wonder.

Back in the real world, curious as to why they did this, when they supply axle tubes to space out the wheels to bearings (like the older F1), which in turn controls the cog sideways movement and makes the need for the motor shaft to control the cog redundant. Alternately as some have suggested use axle stoppers. Then the pinion could have been adapted by extending the plain section to give the reach onto the motor shaft and still retain the through hole.

Sloting Plus do a range of pinions with grub screws these are longer than standard pinions and might be a solution.


Cheers
John.


(Retired veteran of 40 years of Engineering team work)

[BAracer]

So back to first principles...why would you want to change the pinion?