From: djb@invalid.com   
      
   On 13/01/2026 18:42, Bob La Londe wrote:   
   > Thinking about Jim's question about wheels for his saw mill, and my   
   > simplistic replies for brute forcing a solution it made me think about   
   > something I need to make at some point, and I was wondering.  Who has   
   > a heavy duty ring roller?  How heavy of material can you roll with   
   > it.  I am thinking basic low carbon hot rolled or cold rolled steel.    
   > Probably hot rolled.  I don't have anything heavy enough for the   
   > material I am considering (and already have left over from other   
   > projects)   
   >   
   > My alternative for my single application is to make some radius   
   > forming dies for my hydraulic press.  Then I could hot or cold form as   
   > needed. 20 ton (my bigger press) might not be enough for cold   
   > forming.  I'd just need to make two sets.  Maybe one if I got lucky.    
   > One for testing spring back, and one adjusted for that if necessary.    
   > I could CNC them out of some 4140 laying out back.   
   >   
   >   
   I suppose a basic question to start is what size and section type are   
   you thinking about. I've formed 25mmx 25mmx 3mm angle into a circular   
   ring about 550mm diameter using my fly press and a former which fitted   
   each side of the web so it bent the hard way, it required a bit of   
   tweeking to correct twist once done but that was easy enough to do using   
   a vice and a piece of bar with a L cutout to grip it. The fly press is   
   nominally 5 long tons or tonne, bend radius was controlled by adjusting   
   the stroke, the former pressing in the centre between 2 lower support   
   pieces. Later parts were sent out to a specialised section bender that   
   had equipment to bend troublesome sections quite easily.   
      
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