Douglas - For Sale Items

Douglas 1913 Model P motorcycle

Douglas - Wanted Items

Douglas 1915 3 Spd-Gearbox and Clutch

Quick Comments

Lat Fuller

2025-06-04, 05:57:00
Does anyone have the specifications for the oil inlet valve spring for early 2 3/4 engines - Part number 424.   I have tried to order one from the club spares but apparently Jeff Swan is indisposed at the moment.

skapoor

2025-05-19, 09:23:12
I am looking for a carburettor for veteran Douglas motorcycle engine-13651. Could you please help me with this?

Dave

2025-01-07, 19:16:39
Forgotten your password?
Click the 'Log in' button in the main menu, then use the 'Forgot your password?' function to create a new one.

The new password will be sent to your email address. If your email address has changed since your last login, that method won't work as the email will go to the old address in your profile.
In this case, use the 'Contact' option in the main menu to send us a message and we can issue a new password.

Dave

2024-06-11, 21:02:05
Have you tried the new Drafts feature yet? I just lost a long message today and learned my lesson. It is a good idea to save a draft of any long post you are writing. You can then just keep writing and keep saving a draft, knowing you have a backup if there is a glitch. The draft is automatically deleted when you post the message.

CW rear sprocket dish?

Started by Keith, 07 Jun 2019 at 00:32

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

Keith

A friend of mine is in the process of setting up his CNC machine to reproduce the 55t rear sprocket for the CWs.
He has an original which he is working from but needs confirmation regarding the amount of 'dish' built into the sprocket.
I also have an original but it has been mangled too much to reliably measure the dish. :cry:

So, does anyone know the amount of dish on the original or could anyone with a sprocket please measure the dish.

Thanks, Keith...

Alan

From my rather crude measurement technique, I make it 0.450 inch. Should be cross checked by some else however in case mine a bit buckled.

Keith

#2
Thanks for that Alan.
Can you also tell me the actual thickness of the sprocket material? That way we can subtract that from the 0.450" to get the actual "hollow" dimension.

Alan

The plate appears to be about 0.225 in all over give or take some residual nickel plating.
On one side of the gear ie the side that sits against the frame not the wheel, there is a slight indentation say a light skim where a flat level face has been machined . The width of this face is about 0.330 in but couldn't measure the very small depth as a bit variable as you would expect machining a probably a curved and maybe a bit twisted surface.....Hope this helps.....Alan

Keith

Thanks Alan, a great help!