Author Topic: Camplate neutral  (Read 369 times)

Offline Bee-Za

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Camplate neutral
« on: 10.10. 2020 18:06 »
Can I assume I’m right that this is the neutral on the camplate. See photo screw pointing to neutral

Offline Bee-Za

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Re: Camplate neutral
« Reply #1 on: 10.10. 2020 18:22 »
Also this selector rod. I assume it’s held via a grub screw at the main bearing. But does the grub screw clamp the selector rod or does it stop sideways drift. Does anyone have a photo of the grub screw.  see photo of selector

Online RDfella

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Re: Camplate neutral
« Reply #2 on: 10.10. 2020 18:33 »
Yes, that's the neutral detent.
Grubscrew is shown for the S/A gearbox, but the pic is not clear and BSA had the illustration numbers mixed up.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline Bee-Za

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Re: Camplate neutral
« Reply #3 on: 10.10. 2020 19:03 »
Just screwed a bolt into the grub screw hole with the view to making my own grub screw. Out popped a ball bearing. Looks to me there should be a ball bearing inserted first then the grub screw which allows the selector rod to rotate. Should the selector rod be static per the A10 manual I have or should it be allowed to rotate via a ball bearing

Online JulianS

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Re: Camplate neutral
« Reply #4 on: 10.10. 2020 19:09 »
Here is the grub screw.

The rod should not rotate, if it does it may enlarge the hole and cause an oil leak.

Offline Bee-Za

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Re: Camplate neutral
« Reply #5 on: 10.10. 2020 19:36 »
Thanks I’ll make and secure the selector shaft and secure the grub screw into the housing with a punch.
Out of interest I measured the ball bearing at 4.7mm and the groove  at the end of the shaft is 5.6mm. Maybe someone tried a modification in the past. I’ve had this gearbox over 40 years.

Offline Bee-Za

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Re: Camplate neutral
« Reply #6 on: 10.10. 2020 19:54 »
Sorry to go on a bit. But why have the shaft grooved all the way around when a flat on the shaft would make the shaft stronger and allow a flat for just the grub screw. Strange!!!

Online RDfella

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Re: Camplate neutral
« Reply #7 on: 10.10. 2020 20:06 »
Quicker to machine and avoids an assembler from missing the flat, causing eventual shaft misplacement.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline Jules

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Re: Camplate neutral
« Reply #8 on: 12.10. 2020 00:30 »
there's no reason for the shaft to be located radially is there, the grub screw is just to stop it moving longitudinally, correct? if so, I suspect the PO may have misplaced the original shouldered grub screw and used the ball bearing to locate in the groove with a standard flat grub screw locking it in place.....if it did happen to rotate for some reason, no harm done??

Offline Bee-Za

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Re: Camplate neutral
« Reply #9 on: 12.10. 2020 20:05 »
Thanks all *smile*

Offline Bee-Za

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Re: Camplate neutral
« Reply #10 on: 14.10. 2020 19:07 »
Couple more questions and photos
Firstly is this the correct selector to attach to the lay- shaft.
I’ll try and add 2 photos
No only allows one photo 
Question 2 to follow

Offline Bee-Za

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Re: Camplate neutral
« Reply #11 on: 14.10. 2020 19:19 »
This second photo shows lay shaft  top and main shaft bottom. Question is. The gear at the end of the lay shaft slips on and off freely and when on the lay shaft it is stopped by the lay shaft circlip. But the gear at the end of the main shaft is stuck on and the circlip is underneath the gear.
Is this correct? Or should it slip off the end easily?

Offline Bee-Za

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Re: Camplate neutral
« Reply #12 on: 14.10. 2020 19:21 »
Sorry guys every photo I post always rotates 90 degrees anticlockwise

Online berger

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Re: Camplate neutral
« Reply #13 on: 14.10. 2020 21:18 »
both those gears should be a very tight fit, they are pressed on and not normally easily removed. the circlips are stops for the gear position

Offline Bee-Za

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Re: Camplate neutral
« Reply #14 on: 15.10. 2020 07:29 »
So main shaft gear is pressed too on too far. Is there a set distance from the end of each shaft to the gear.