What are you machining?

  1. Brad93

    Brad93 M J B Engineering

    Messages:
    10,386
    Location:
    Essex
    Nice repair.
     
  2. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    Turned down two 12.9 bolts, and some other bits. Snapped both of my ph horn mini boring bars :mad: No idea why /how either.
     
  3. Johnnybravo Member

    Messages:
    1,174
    Location:
    Northiam
    Normally not enough rpm coupled with too bigger cut/ too aggressive feed...Unfortunately Carbide has very little flex in it. Can also be tool height above center with play in the cross slide and it pulls the bar down,snapping it off....
     
    DAPPH likes this.
  4. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    [​IMG]

    M13x1.0 screw in en16t for my cam chain tensioner. I wanted fine for easier adjustment and limited by tools as I dont have an m12 fine tap, Ive got to screw cut the nut. I'll use an 11NL tool and the smallest bore it will fit is 12mm after quite a lot of grinding, so M13.

    I could have used m10x1 tap/die and saved a lot of time.
     
    lchris21, Rannsachair, Hood and 2 others like this.
  5. My Old Landy

    My Old Landy Melting Metal

    Messages:
    238
    Location:
    Buckinghamshire UK
    Nothing exciting, just seeing if the ER20 collets work as expected. Yes they do!
    Milling with ER20.jpg
     
  6. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    I do much of my work in the evening, often up to 10pm-midnight, have my diner after or I dont get much done. Problem it stops me doing noisey work like grinding, tho doesnt stop me swearing, when I found I had more to grind off. I use marker to check rubbing and there is none, and Ive got 2mm clearance to allow backing out

    [​IMG]

    Anyway I now have it all set up for the M13x1.0 nut. I couldnt find a drill size but it seems 1mm pitch bores are 0.9mm less than the size, so Ive bored to 12.1mm.
     
    fizzy and My Old Landy like this.
  7. Hood

    Hood If it walks like a duck....

    Messages:
    12,581
    Location:
    Carnoustie, Scotland
    For metric it is simple, just deduct the pitch from the diameter and it will be close enough for most threads.
     
    minimutly, Kram and zx9 like this.
  8. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    [​IMG]
    [​IMG]

    Not quite right. The nut length is a bit excessive 37mm long, screw thread is about 80mm, and it is binding about 33mm in.

    Straight infeed distance should be 0.54mm (1.08mm). I am upto 0.62mm, (1.24mm) and dont want to make it tooo loose.

    [​IMG]

    That took ages. I think the screw had a burr gave it a quick sand and now it is fine :dontknow:

    [​IMG]
     
    Last edited: Jul 7, 2020
    lchris21, fizzy, decca and 3 others like this.
  9. Dr.Al

    Dr.Al Forum Supporter

    Messages:
    784
    Location:
    Gloucestershire, UK
    :thumbup: What he said. If you want to play around with different thread engagements (as opposed to the circa 75% that the diameter – pitch thing assumes) I made a calculator: https://www.cgtk.co.uk/metalwork/calculators/tapdrill - it's completely unnecessary for most purposes, but can be handy for thin or hard materials.
     
    lchris21, minimutly, Kram and 2 others like this.
  10. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    [​IMG]

    Locking nut. This was much quicker, tho was not a through bore like the last. I cut a 2mm wide relief at full depth to start, 1mm away from shoulder. I do like threading away from chuck!
     
    Dr.Al and My Old Landy like this.
  11. zx9

    zx9 Member

    Messages:
    4,325
    Location:
    South East London
    I've never tried that, given that the insert is on top I assume you are running the spindle backwards, which theoretically I can't do but would probably be ok with for light passes.
     
    daleyd likes this.
  12. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    Milled flats to finish the CCT locking nut. I know access is poor so went small 19mm flats. [​IMG] [​IMG]
     
    fizzy, My Old Landy and slim_boy_fat like this.
  13. Steveblade

    Steveblade Member

    Messages:
    133
    Location:
    West midlands
    Its an extractor of some kind ? ooo im slow tonight/this morning :doh:
     
  14. Pete.

    Pete. Member

    Messages:
    9,809
    Location:
    Kent, UK
    I don't get much chance to do any machining right now so a rare treat today. Turned up a housing to hold a small toroidal transformer. The power feed on my HLV needs 110V but I only have 230v in there which was driving the 1750rpm motor at over 4000rpm so I wired this unit as an autotransformer to halve the voltage (It has a split primary winding). It was too big to fit in the control box and I didn't want to run wires up and down the length of the machine to put it in the cabinet.

    So I bored out a chunk of the ally I got from Pressbrake1 and turned the OD and a step in the end.

    HLV transofrmer housing 1.jpg

    The control box has a handy round cover just right for converting into a mount.

    HLV transofrmer housing 2.jpg

    I left the ring 10 thou tight and heated it up with a torch then shrunk it in place and glued an insulator in the bottom of the well.

    HLV transofrmer housing 3.jpg

    Transformer fits nice and snug.

    HLV transofrmer housing 5.jpg

    All fits like a glove in the back of the control box.

    HLV transofrmer housing 6.jpg

    HLV transofrmer housing 7.jpg
     
  15. grim_d

    grim_d Unlikeable idiot.

    Messages:
    3,095
    Location:
    Scotland - Ayrshire
    Land rover TD5 manifold for a friend, about 1.5mm of warp over its length.

    Had to get a bit creative with the setup being careful not to flex it...looks jenky but it worked!

    It's now flat enough that no light could be seen through it when placed on the table.

    IMG_20200726_222319.jpg
     
    decca, zx9, My Old Landy and 5 others like this.
  16. Pete.

    Pete. Member

    Messages:
    9,809
    Location:
    Kent, UK
    Glued some teeth on a cast iron gear tonight. Came out nice. It did ring a bit as it's a hard SG iron but at least the teeth will stay on.

    106 tooth gear.jpg
     
  17. Johnnybravo Member

    Messages:
    1,174
    Location:
    Northiam
    That’s not hard.... Remind me to slip you a nice hard cast iron blank in the future ...:clapping::clapping::clapping:
     
  18. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    Helping out a neighbour removing a concreted fence post yesterday. We were not getting very far, I made up an sds core drill adaptor (to be used without hammer).

    [​IMG]

    But by the he had it done...
     
    lchris21, zx9, My Old Landy and 2 others like this.
  19. Anguz

    Anguz Forum Supporter

    Messages:
    677
    bedfordshire
    just in case you cant reach with your adaptor, i made an extension for mine yesterday for a chisel 20200809_161955.jpg
     
    mpats, zx9, My Old Landy and 3 others like this.
  20. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    Drilling for oil?!
     
    DAPPH and slim_boy_fat like this.
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