2 speed gear questions | Scotts Owners Club

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16th November 2011 at 10:27 pm #2893

Deleted User
Participant

Hi

Firstly may I introduce myself, my name is Steve and I am a bit of an imposter here 😳 . I have a 1914 P&M I am restoring but due to the lack of people with these machines I was hoping this group could help me with the 2 speed gear.

Firstly does anyone know how similar the Scott and P&M systems are? I know they are close but how close, are parts interchangeable for instance?

Secondly I was wondering if anyone can tell me what the clearance between the drum and the sprocket drive face should be?

Thirdly my wedges have 2 different shapes and I have no way of knowing if either of them are correct. Are there any drawings available that give the necessary details to manufacture some new ones?

Any and all help/advice will be gratefully accepted. 😀

Cheers
Steve

21st November 2011 at 9:04 am #9530

richard tann
Participant

Steve

No response here, so welcome to the wonderful world of Scotts!

I am not sure that the P&M and Scott 2speed gear arrangements are that closely related. I understand the P&M uses side-by-side twin primary chains driven from a double engine sprocket, these drive a countershaft containing the selection device. The same principle as the Scott, but more akin to the early Royal Enfield 2speeder.

I can scan and send illustrations of the Scott and RE arrangements if they are of interest.

Good luck.

Richard Tann
membership (at) scottownersclub.org

21st November 2011 at 9:51 pm #9531

Deleted User
Participant

Hi Richard

Thanks for the reply.

Here is what the P&M version looks like

I believe they are very similar ? This is what has lead me to ask the question here, what I really need to know at the moment is how much clearance is required between the internal drum (with the expanding rings) and the inside surface of the sprockets. I would think that despite and differences this would be the same/similar.

It may be of benefit to see the other systems so I would appreciate it if you could send those scans through to me. Please send them to me at sloper at tpg.com.au

Cheers
Steve

27th November 2011 at 6:10 pm #9532

richard tann
Participant

Steve

Did you receive the Scott 2speed gear info? I wondered if you could open the .doc files?

I looked at a Scott 2speed unit today and agreed with the owner that the clearance between the expanding ring and the gear drum is minimal, probably 5 – 10 thou. Don’t hold us to it, stripping it down is the only way to get an accurate measurement.

Did you know that the BAT of 1910 and 1911 was offered with the P&M 2speed gear? Also, there are usually a few P&M’s in the Pioneer Run, the Sunbeam Club might put you in touch with their owners.

Richard Tann

27th November 2011 at 9:28 pm #9533

Deleted User
Participant

Hi Richard

Yes I got the doc open, thank you very much, it has been a help.

Now that I see the Scott item it is obvious that it is quite different to the P&M unit. But then the P&M unit differed between different years as I found out when talking to other owners. Mine being ’14 has the expanding rings as part of the bronze hub whereas ’15 on and the scott have the expanding rings as seperate pieces.

That is good to hear about the minimal clearance, that is what I was thinking.

Cheers
Steve
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