Stuart Dynamo pulley dimensions

• Stuart Dynamo pulley dimensions
  Posted by 34046 on 17 Oct, 2020 03:10
• I need to make a crowned type pulley for an early Stuart type dynamo
  
  If anybody can help on dimensions please I would be grateful
  
  Thank you
  
  Stuart
• 
  
• #1 Reply
  Posted by Stoker on 17 Oct, 2020 09:31
• My Stuart dynamo has what appears to be a combination pulley mounted on its 5/32" shaft. There is a round belt pulley groove which has a max. O.D. of 3/4" that is 7/32" wide and contains a groove .100" wide, with a 9/16" diameter at the groove bottom. Outside of that is a collar section for a flat belt with a 3/8" O.D. that is 9/32" wide, with a single tiny slotted setscrew, and showing no crown.
  
  Hope that is of some help.
• 
  
• #2 Reply
  Posted by 34046 on 17 Oct, 2020 10:28
• Thanks reply
  
  This may help
• 
  
• #3 Reply
  Posted by Stoker on 17 Oct, 2020 18:33
• Here's some images captured off the internet, that show just the kind of combo pulley that my Stuart dynamo has mounted.
  
  Note that one of the images in B&W looks to be an official ST catalog image.
  
  It may be that the image you show has been turned down to the crowned wide flat belt configuration from the original pulley, or from stock material. Or perhaps the wide flat belt only pulley was an option as well?
  
  [ Guests cannot view attachments ]
  
  [ Guests cannot view attachments ]
  
  [ Guests cannot view attachments ]
• 
  
• #4 Reply
  Posted by eec1910 on 19 Oct, 2020 09:28
• Hello Stuart,
  I've measured the crown pulley on my 1934 Stuart dynamo and the highest point of the
  crown is 0.750" going down to 0.685" at the ends,the length is 0.665".
  You can see it on my Bassett Lowke Lighting Plant in the video section hope this helps.
  
  Trevor.
• 
  
• #5 Reply
  Posted by 34046 on 19 Oct, 2020 15:25
• Trevor
  
  Many thanks - just what I needed.
  
  Now off to find your video
  
  Stuart
•