Advice before I commit sacrilege

  1. fizzy Forum Supporter

    Messages:
    4,932
    uk
    I currently can only find 1 tool for my Colchester Triumph lathe. A nice Sandvik. I want to try the lathe out but the tool tip is a bit too high above centre height. I only have the standard 4 way tool post. Is there any way of lowering the indexable tip or do I have to use a face mill on the tool body to shave off 1 or so mm?
     
  2. Milkybars

    Milkybars Member

    Messages:
    147
    Location:
    Essex
    Just face mill it but make sure you are square, when you do so. Maybe take a little more than you need so you can shim it perfectly to height or adjust it in a holder
     
  3. fizzy Forum Supporter

    Messages:
    4,932
    uk
    That is what I thought.
    There is a little spacer under the indexable tip but when I remove that the bit won't hold. Would be fine without it.
     
  4. Wallace

    Wallace Member

    Messages:
    6,562
    Location:
    Staines, Middlesex, England.
    Do you not have any HSS?
     
  5. fizzy Forum Supporter

    Messages:
    4,932
    uk
    I have loads of lathe tools somewhere :doh:
    I have about 100 crates full of stuff.
    Bit like trying to find the ark of the covenant in the Indiana Jones film!
     
    Wallace, Maker, galooph and 3 others like this.
  6. gaz1

    gaz1 Forum Supporter

    Messages:
    8,935
    Location:
    westyorkshire
    then leave lathe alone and tidy up then you might find what your looking for

    then use the right tool for the job
     
  7. fizzy Forum Supporter

    Messages:
    4,932
    uk
    Easier said than done - ideal will be in about 2 years when hopefully I move somewhere with a big enough workshop to set it all up nicely.
     
  8. pressbrake1

    pressbrake1 Member

    Messages:
    1,567
    essex england
    That’s the shim to protect the main body from damage when a carbide lets go. Please don’t remove it.
    It’s pretty common practice to have to chomp down tool holders
     
    Hopefuldave likes this.
  9. fizzy Forum Supporter

    Messages:
    4,932
    uk
    I guessed so - thanks!
    Times like this I wish I had a surface grinder:thumbup:
     
  10. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    9,643
    Location:
    Bedfordshire England
    Leave the tool. Skim the post
    That way any indexing tooling that matches the first will be on center.
     
    cocker likes this.
  11. outofthefire

    outofthefire Member

    Messages:
    2,074
    Leeds
    If you only have random tools isn't it better to keep the toolpost a known quantity and make all the different tools fit it (just my logic not based on experience, hence the question)
     
    pressbrake1 likes this.
  12. slim_boy_fat

    slim_boy_fat Forum Supporter

    Foolish, schoolboy type error - you know what's going to happen next, don't you! :scared: :laughing:
     
    Maker likes this.
  13. spencer 427

    spencer 427 Member

    Messages:
    6,264
    uk colchester
    Location:
    uk colchester
    Ya need a big ol Dickson t4 or five
     
    fzr phil likes this.
  14. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    9,643
    Location:
    Bedfordshire England
    Depends. If you have a set of indexible tooling from the same manufacturer the center heights are all gonna be the same
    Depends on tooling.

    I'd rather do the post once than 7 tools
     
    outofthefire likes this.
  15. Hood

    Hood Forum Supporter

    Messages:
    9,652
    Location:
    Carnoustie, Scotland
    If my post was, for example, for 3/4" tooling I would skim the post so that 20mm tooling would fit in. If I was trying to use 25mm tooling then I would skim the tool.
    Decent quality tools are relatively cheap nowadays so often better just to buy the right size.
     
    minimutly and pressbrake1 like this.
  16. pressbrake1

    pressbrake1 Member

    Messages:
    1,567
    essex england
    I would really avoid damaging a tool post , making the bottom thinner will weaken it which can cause distortion.
    Secondly unless its home made it will be hardened
     
    outofthefire, slim_boy_fat and Hood like this.
  17. mrsbruce

    mrsbruce Forum Supporter

    Messages:
    1,251
    Location:
    Livingston, Scotland
    I have a cheap QC post fitted, and even cheaper tool holders. I had bought several tools that were too big to centre in them (my error when purchasing). Solved it by popping the tools in the mill vise, base up, reduced their depth by 2mm, and now they fit perfectly. I also tried milling two of the tool holders for future purchase errors, with great success.

    IMHO, leave the tool post, and mill the tool.
     
    slim_boy_fat likes this.
  18. Morrisman

    Morrisman Forum Supporter

    Put a piece of shim under the back end of the tool, leave the tool poking out the front of the tool post a bit, which will lower the front. :D
    Job done, simplest answers are the best.
     
    slim_boy_fat likes this.
  19. Burdekin

    Burdekin Chief Bodger

    Messages:
    4,761
    Location:
    Aberdeen
    Shim the back to lower the front to centre.
     
  20. pressbrake1

    pressbrake1 Member

    Messages:
    1,567
    essex england
    The op is using carbide which is most likely negative rake so lifting at the rear could compound it if he try’s to face with it
    Does anyone remember the tapered holders for hss increasing rake by tilting the toolbit so saving the amount needed to be ground from the top making the tool stronger and making it easier to set centre height
     
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