Camel(fish)back straight edge

  1. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Despite having the bubonic plague over xmas Ive finally finished the mock up for a 26” straight edge with dovetail.
    I member on here gave me details of a friendly foundry who im going to see Monday.
    Im doing this for the pleasure of casting then originate a pair of straight edges from nothing as detailed by joseph whitworth the inventor of scraping and a founding father of accuracy ( no it wasn’t the kings)
    View attachment 206122
     
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  2. mtt.tr

    mtt.tr Member

    Messages:
    1,340
    Essex England
    Not bad for a metal masher.

    Actually very good.
     
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  3. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Coming from a wood butcher I ll take it as a compliment
     
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  4. TechnicAl

    TechnicAl Member

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    7,050
    Location:
    Rotherham
    looks good
     
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  5. Pete.

    Pete. Member

    Messages:
    8,559
    Location:
    Kent, UK
    That's only the second time I've seen them referred to as a fish-back. The first time I got a whopping bargain for an un-used 48" fish-back that must have dodged all the ebay searches. Drove 6 hours to collect it though.
     
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  6. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Its a yank thing
    Before discovery channel English wheels were just called a wheel or raiser
    Before becoming a popular hobby straight edges over here were called fishback until americanising
     
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  7. Maker

    Maker nEw mEmBeR

    Messages:
    6,884
    Location:
    Don't ask questions
    That looks great, will the casting need aging? I understand that's how machine tools tend to be built.
     
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  8. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Thanks Heat treatment prior to machining
    Ringing stress relief two coats of biax ringing again then bring in by hand scraping
    I reckon hot and cold cycles like the weather cold work . That how I think old fashioned seasoning works ie not rain but freezing cold and getting hot in the sun.
    I suppose if one was getting excited sending off the drawing to get stress analysis and to check thermal symmetry would be useful..
     
  9. Pete.

    Pete. Member

    Messages:
    8,559
    Location:
    Kent, UK
    I'm in the 'check it before you use it' camp. Before I got my 12" straight edge I had a dovetail piece that I used to have to scrape in 2 passes if it had been sitting around a few months. It would spin like a top again 6 months later.
     
  10. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Spencer has one of those 12” jobs, he says it’s twisted like a mo mo
     
  11. fizzy Forum Supporter

    Messages:
    4,925
    uk
  12. Pete.

    Pete. Member

    Messages:
    8,559
    Location:
    Kent, UK
    His one needs more machined off it, it still has some skin. Mine holds it's shape beautifully. The one I was on about was a slab of Iron I got from somewhere with a wedge on one side.
     
  13. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    According to a person I respect for his knowledge and craftsmanship
    C98AF780-0F2E-4DC2-BCBF-FAD3DE7AA045.png
     
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  14. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    I know you wasn’t talking about your cast one, just thought id mention crazy horses se
     
  15. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Progress on 36” pattern and short 12” & 20” cross slide straight edges.
    These solid types were what we used , normally cast in house.
    Machined dead parallel so could be used with level on top
    EB43D25C-F60F-43B2-8411-A498D04BACB1.jpeg
     
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  16. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    Dropped patterns out foundry today.
    Was pleased when he said Id done a better job than most making the patterns , id thought I done a rough job!
    Its given me more ideas for vee blocks etc
     
  17. Tom O Member

    Messages:
    220
    Location:
    Canada
    They are nice patterns!
     
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  18. mm289 Member

    Messages:
    503
    Dover, Kent
    Will be interested to see how this goes @pressbrake1 - keep up the good work:clapping:

    MM
     
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  19. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,002
    Location:
    East Yorkshire
    @pressbrake1 I take it they can’t help with the wheeling machine casting?
     
  20. pressbrake1

    pressbrake1 Member

    Messages:
    1,520
    essex england
    No he can only go to 50kg
    Best quote so far for wheeling machine is £3000+vat from place up north
    Its mad, within the last forty years 20ton castings could be done in silly Essex now im struggling for a ton nation wide
     
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