What are you machining?

  1. Kram

    Kram Member

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    587
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    Sussex
    Got a nice DTI arrive in the post. Broke the soldered shim on my indcator holder. New brass screw, with end turned 60 degrees.

    [​IMG]
     
  2. lchris21

    lchris21 Member

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    South Wales
    some switchgear for my bike build...
    20191107_175854.jpg 20191109_181414.jpg 20191109_181838.jpg
     
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  3. mtt.tr

    mtt.tr Member

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    1,132
    Essex England
  4. lchris21

    lchris21 Member

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    thats what the slot in the side is for ;)
     
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  5. Kram

    Kram Member

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    587
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    Sussex
    That saying, "Dont put your fingers where you wouldnt put your dick". Well applies to face too. Leaning into the gap behind to fit chip guard and a ccmt tool twatted me in the lip.

    [​IMG]

    First chips in ages. Boring out a 3" lump to be spindle pulley/hub for the 110mm and 180mm pulleys.
     
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  6. roofman

    roofman Purveyor of fine English buckets and mops

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    Going on from your wanted thread...can i ask what are you making of fixing with stepped pullys?:)
     
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  7. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

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  8. Kram

    Kram Member

    Messages:
    587
    Location:
    Sussex
    Rough atttempt at a pulley. Started cutting right side angle by compound and the rest is rough.

    [​IMG]

    Problem being, without a tool angled under 38? degrees, wont have clearance enough to sweep the bottom. Should I start with a square groove tool to full depth, and then cut the angles, until they intersect?
     
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  9. ronan

    ronan Forum Supporter

    Messages:
    9,097
    dublin


    Yes, i always plunge with a parting off tool, get the bulk of the material out of the way and give yourself a bit of room to work.
     
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  10. Hood

    Hood Forum Supporter

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    Carnoustie, Scotland
    I would grind up an HSS form tool for that. Same profile on both sides as the pulley groove but narrower.
     
  11. mtt.tr

    mtt.tr Member

    Messages:
    1,132
    Essex England
    Have 4 poly bushes to make, not the most pleasing material but its do able.

    First job was to make an arbor and clamp its against the Chuck jaws, its damn grippy.
    IMG_20191126_135328_7.jpg
     
  12. mtt.tr

    mtt.tr Member

    Messages:
    1,132
    Essex England
    Just to make some stainless sleeves and its done. Hopefully Only an hour left
     
    • IMG_20191126_155822_7.jpg
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  13. slim_boy_fat

    slim_boy_fat Forum Supporter

    You going to knit a jumper? :scared:. :D
     
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  14. mtt.tr

    mtt.tr Member

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    1,132
    Essex England

    Horrible bloody stuff.
     
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  15. Hood

    Hood Forum Supporter

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    Carnoustie, Scotland
    I have only ever machined it once and thought it was quite nice to machine, maybe a different grade or something. I used a DNMG insert but it was actually a HSS insert, polished and very sharp with a positive rake.
     
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  16. Ton-up

    Ton-up Member

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    1,364
    Location:
    Essex, England.
    Easy to machine if you slice it rather than turn it.
     
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  17. mtt.tr

    mtt.tr Member

    Messages:
    1,132
    Essex England

    If im honest this stuff was pretty easy, just ground a hss blank very positive rake finsh was good. I have machined softer poly and that really is awful as it just doesn't want to come away.

    I also find deep depth of cut high speed infeed and fast spindle speed using stabbing moves forces the poly to break away from it self, continuous cuts it get pushed along in a complete ring

    Oh and wood spade drills are the nuts for drilling it


    Its more akin to wood turning.
     
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  18. Kram

    Kram Member

    Messages:
    587
    Location:
    Sussex
    Pulley done, other than the keyway.[​IMG]

    Too big :doh:

    [​IMG]

    1:1.
     
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  19. ronan

    ronan Forum Supporter

    Messages:
    9,097
    dublin
    You can do the keyway on the lathe too if you don't have broaches and a press. Using the carriage like a shaper.
     
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  20. Maker

    Maker nEw mEmBeR

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    Don't ask questions
    I've tried that once, I found it worked much better using the more rigid rear toolpost, tightening the gibs on the compound would have probably helped too.
     
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