Valve re-facer gear help!

  1. Woody.v8

    Woody.v8 Blue gluer

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    I've been given the opportunity to buy a valve cutter/refacer off a friend of mine , it looks a lovely little machine but on closer inspection it wasn't free to turn and it was down to a plastic gear being split .
    Does anyone know if these can be recut or 3d printed? I hope so because the little mini lathe looks a belter and it would be a godsend to be able to do my own.
    20191202_212755.jpg 20191202_212743.jpg 20191202_212601.jpg 20191202_212331.jpg
     
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  2. Spark plug

    Spark plug Member

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  3. Parm

    Parm I have fun doing stuff

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    Buy the machine, obviously for a bargain basement price

    Then worry about the spares
     
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  4. brightspark

    brightspark Member

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    is there no room to pull it back together plate the sides and pin it
     
  5. Woody.v8

    Woody.v8 Blue gluer

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    Not really as it's tight to the machine at one end and tight to the gear the other
     
  6. slim_boy_fat

    slim_boy_fat Forum Supporter

    Almost certain to be able to source [or make/print] one. Get it bought. ;)
     
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  7. brightspark

    brightspark Member

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    27,021
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    be tempted to rebate it a bit and pin nothing to loose by trying
     
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  8. RichardM Member

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  9. MBB Forum Supporter

    Messages:
    746
    Location:
    northumberland
    Replace the bottom gear and the broken gear with off the shelf straight cut gears. Can be bought from HPC gears ready made.
     
  10. 8ob

    8ob Forum Supporter

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    As above, push the plastic gear off the spur gear and the gap will close. Rebate a disc into plastic gear both sides and pin/bolt, then press it back on. A big washer sandwich if you like :).

    Bob
     
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  11. Agroshield Member

    Messages:
    186
    I think you have linked to the wrong page. His photo clearly shows a helical gear whereas the calculator is for a straight cut spur gear. Please can you repost the correct one.
     
  12. Agroshield Member

    Messages:
    186
    Another simple way along the same lines: push it off the metal gear, clean it like you were TIGing titanium, superglue the crack, use a Jubilee clip to squeeze it back into shape, drill two lines of small holes one either side of the crack and sew it together with suitable kevlar thread. Recess the threads so they are flush. Warm it up a bit before pushing back onto the steel gear.
     
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  13. Woody.v8

    Woody.v8 Blue gluer

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    I can't do that as everything the gears mesh into is helical.
    Edit : I see what your saying now, I'll have to have a look at the bottom gear off the drive Motor and see how it's fixed/driven.
     
  14. Woody.v8

    Woody.v8 Blue gluer

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  15. MBB Forum Supporter

    Messages:
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    Location:
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    Its not a valve grinder it cuts the valve. If you have a lot of valves to cut may be a good buy. If it was a valve grinder you can easily adapt it to make a tool cutter grinder. Valve cutters and grinders or more or less obsolete now unless you are running a engine reconditioning business.
     
  16. Woody.v8

    Woody.v8 Blue gluer

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    I said it was a valve cutter in the OP , I build my own race engines so it will get plenty of use!
     
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  17. brightspark

    brightspark Member

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    did you race this year woody all went quiet on the car :)
     
  18. Woody.v8

    Woody.v8 Blue gluer

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    No mate i've had a year out , i've missed the racing but i needed it to get my head together and sort a load of roundtuits out, Plus i'm raring for next season now!
     
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  19. Pete.

    Pete. Member

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    I would fix that by re-making the hub with the key so it has a thin flange one side but is a slip fit in the plastic part instead of press fit. Drill a ring of holes in the flange and the plastic and rivet together.
     
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  20. Woody.v8

    Woody.v8 Blue gluer

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    Good idea , like a top hat
     
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