Robey style roller - work in progress.

• Robey style roller - work in progress.
  Posted by 34046 on 13 Mar, 2019 11:02
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  Mamod firebox assy and lorry chassis. All rolls etc are scratchbuilt 2.5 inch front and 3 inch diameter rear from 1l4 inch wall aluminium tube.  Disc on rear roll is the handbrake drum.
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• #1 Reply
  Posted by Pete the steam on 13 Mar, 2019 11:05
• That is going to be a BEAUTY.
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• #2 Reply
  Posted by Nick on 13 Mar, 2019 11:11
• Quote from: Pete the steam on 13 Mar, 2019 11:05

  That is going to be a BEAUTY.
  

  
  Agreed! 
  
  Love the steering on that one
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• #3 Reply
  Posted by St Paul Steam on 13 Mar, 2019 19:18
• that's clean ,long and beautiful I'm glad I opened this this thread 👍
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• #4 Reply
  Posted by Jim on 13 Mar, 2019 19:20
• That's an impressive build.
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• #5 Reply
  Posted by SeeSteam on 13 Mar, 2019 19:34
• Marvelous steering. I am surprised that I haven’t seen that in practice on big steamers. Very clever.
  
  Where did you get a ready supply of chain?
  
  
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• #6 Reply
  Posted by RedRyder on 13 Mar, 2019 19:49
• That is shaping up into an awesome build.
  
  Great work!
  
  Gil
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• #7 Reply
  Posted by 34046 on 14 Mar, 2019 02:59
• Quote from: CBWho on 13 Mar, 2019 19:34

  Marvelous steering. I am surprised that I haven’t seen that in practice on big steamers. Very clever.
  
  Where did you get a ready supply of chain?
  

  
  The steering, bit of a challenge, is as per full size. If you google Robey Tandem Roller you should get full size machines.
  
  The chain is stainless from Meccano Spares in uk -- https://www.meccanospares.com  Gears are meccano.
  
  Thanks to all for the favorable comments.
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• #8 Reply
  Posted by SeeSteam on 14 Mar, 2019 07:40
• I googled as you said. Wow!
  
  On the to do list for visiting the UK: go to a vintage steam event! So many cool machines and it's neat time see the different manufacturing.
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• #9 Reply
  Posted by jkbixby on 14 Mar, 2019 13:24
• That is really well done - a very nice piece of craftsmanship!
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• #10 Reply
  Posted by Weedensteam on 16 Mar, 2019 23:32
• Good looking project, hex head bolts in frame are a nice touch, have you checked the gearing, from my experience with TE's it may have to be geared down a bit more.
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• #11 Reply
  Posted by 34046 on 17 Mar, 2019 04:40
• Quote from: Weedensteam on 16 Mar, 2019 23:32

  Good looking project, hex head bolts in frame are a nice touch, have you checked the gearing, from my experience with TE's it may have to be geared down a bit more.
  
  Point taken on gearing - thanks.
  I have used meccano gears to date and selected the ones that were in proportion to the full size engine so trying to keep looking realistic.
  On reflection I think best to steam up and test at this stage before proceeding.
  Glad you mentioned it - thanks.
  
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• #12 Reply
  Posted by Weedensteam on 17 Mar, 2019 11:17
• The RPM's are pretty high on the Mamod oscillators, so for what it is worth I find a 20:1 reduction is about right for a realistic speed on the TE's, you are working with smaller diameter driving wheels so that will have to be taken into consideration.
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• #13 Reply
  Posted by 34046 on 17 Mar, 2019 12:49
• Quote from: Weedensteam on 17 Mar, 2019 11:17

  The RPM's are pretty high on the Mamod oscillators, so for what it is worth I find a 20:1 reduction is about right for a realistic speed on the TE's, you are working with smaller diameter driving wheels so that will have to be taken into consideration.
  

  
  I had overlooked this and it is now an area of concern but well pleased you mention it.
  
  I will try it now but suspect you will be proved right.
  
  If so, as I want to complete my 4 inch before I pop my clogs, I shall have to find it a new home.
  
  
  
  
  
  
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• #14 Reply
  Posted by 34046 on 17 Mar, 2019 13:57
• You were right, gearing far too high, so good it was mentioned at this stage.
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