Author Topic: Douglas 2 3/4hp - Early 2 Speed Gearbox Sprocket - Enquiry Only?  (Read 189 times)

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Offline pvn06

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Hi Everyone, Merry Xmas to You All,

Before anyone gets their hopes up . . . sorry, but despite the heading - this is not a listing to say I have had sprockets made, but rather an enquiry to find out if anyone knows of anyone that has already had made early Douglas 2 3/4hp gearbox 5 hole sprockets (as numbered Number 1 in the accompanying photo), or failing that . . . a gentle enquiry to find out if there are other Douglas 2 3/4hp owners out there who are also in need of a sprocket - because their own is either worn out or missing?

I am not going to fib - I think at this stage it is unlikely I will have a batch made - I have already made some enquiries and it looks neither easy or cheap, but I am talking to a specialist sprocket manufacturer at the moment, and although they are not able to make the entire sprocket (they do not have ability to make the taper) - they have said they can make a 'blank' sprocket with the right tooth profile, that I could machine to size and braze to my original worn sprocket.

Even this option is expensive - but I thought before going ahead and biting the bullet on just a single sprocket for myself . . . I would test the interest of other similar owners here, either to see if I have missed something - and there are already some available, or if enough interest . . . to consider a larger batch.
The photograph of the two sprockets below are I believe the early (pre 1919) type - which in most photographs are shown with 5 holes.  Next to it is a later 6 hole type which I believe was fitted to a number of later models into the early 1920's.  At this stage I am looking at the early type - which I believe is 1/2" x 3/16".   I believe the later 6 hole sprocket is 5/8" x 1/4"- I have no plans to have any made this size in the near future - but let me know if you need one, it will at least let me know demand.

My email is paul.norman@racingvincent.co.uk and I am probably going to go ahead with a single sprocket for my own bike in the next 3 weeks, so this is just a quick check with other owners before doing so - please be quick if you do have an interest, once I am committed to a single sprocket I doubt I will take things any further.

And finally - a quick photo of my own Douglas 2 3/4hp build (@1919-20 TT Rep, but with earlier front end fitted).  It is now back on its own wheels and engine and 2 speed gearbox now fitted.  As you can see the gearbox is in need of a good sprocket!!

I will cover it in a separate posting, but if you look carefully you will see that - although I have fitted the earlier type forks (as fitted to the 1912-14 TT bikes), as the chassis/engine are 1919/20 - I have fitted an Andre damper to the forks, of the type sometimes fitted to Brooklands bikes (including Brooklands Douggies) in the early 1920's - I could not resist the chance to add a bit of BS!
Anyway - as I have already made the earlier type fork spindle sets for sale (see our RacingNorton website Douglas section), I also made a few extra sets of the stainless steel extension bolts to mount this type of Andre dampers to that fork type.  I will be listing them in next couple of weeks and will provide more details (including where I was able to obtain the Andre damper) in a separate topic here when I do so.

Best Wishes and Happy New Year to you all!
Paul
www.RacingNorton.co.uk and www.RacingVincent.co.uk



 

Offline pvn06

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Hi All,
Just giving an update to this thread.  Unfortunately the custom sprocket maker was not able to supply full sprockets - and a custom blank was just too expensive and still needed additional work from myself.

I did find a supplier of industrial sprockets of the right pitch though . . . here is progress so far, see photos.
Just need to braze now.
A lot of work, and not sure I want to make more - but may consider making a batch of 'blanks' to go on existing sprockets as per the method here.  Email at normal email if interested

Best wishes
Paul
www.RacingNorton.co.uk