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  1. Thread: Old files...

    by dian
    Replies
    24
    Views
    1,701

    files make nice vice jaws. is than urine thing...

    files make nice vice jaws. is than urine thing real? whats in there that would dissolve steel in a usefull timeframe? sulphuric acid (often) works.
  2. Replies
    42
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    3,218

    threads in epoxy resin: a m6 screw holds a max....

    threads in epoxy resin: a m6 screw holds a max. torque of 4.5 nm in 12 mm epoxy. thats about 1/3 of an "8" nut. however the torque decreases with the pitch. e.g. a 6.3 mm sheetmetal screw (roughly...
  3. i guess i missed the diameter was the same. what...

    i guess i missed the diameter was the same. what would be the formula for a coil spring in tension/compression? same thing?
  4. Thread: Anodizing 7075

    by dian
    Replies
    11
    Views
    951

    a lot of 7000 series gets anodized, like...

    a lot of 7000 series gets anodized, like suitcases or iphones.

    Reasonable Expectation- Black Anodizing 7075

    rons, this is a good read: The Surface Treatment And Finishing of Aluminum And Its...
  5. are you guys sure about the formula? what about...

    are you guys sure about the formula? what about the diameter of the coils?
  6. Replies
    33
    Views
    2,564

    fciron, i agree. the strap can look green (or...

    fciron, i agree. the strap can look green (or yellow or pink). its surface oxide. copper will not rust through. as long as the terminals (usually steel) are not corroded inside and the connection is...
  7. Replies
    9
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    597

    i remember destroying tpnk (k2885) inserts on...

    i remember destroying tpnk (k2885) inserts on hardox 450. it fortunately has not come up since then, but i would tend to round inserts and a negative land for roughing (burry the land). you might...
  8. Replies
    9
    Views
    597

    surprised you recommend such and "ancient" insert...

    surprised you recommend such and "ancient" insert and the high angle for hard steel. not doubting you, just curious. what would all the new geometries be for?
  9. Replies
    72
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    4,284

    last time a was in bombay (bumbay, mumbay ...) i...

    last time a was in bombay (bumbay, mumbay ...) i saw workers doing just that. i believe they were paid less than i took to buy the calories to be able to do the work standing.
  10. Thread: Help Wanted

    by dian
    Replies
    25
    Views
    1,965

    sorry, but i feel its a waste of time and effort...

    sorry, but i feel its a waste of time and effort to have somebody show you machining in one or two afternoons. you will never remember what he did and even if you do you wont remember why he did it...
  11. Replies
    82
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    6,194

    so you figure the cariage is rotating as you cut?...

    so you figure the cariage is rotating as you cut? taking up the slack from od turning? then its simple, give it a bump before you start. boring on the backside should produce no taper, right? cross,...
  12. touching a piece of cold metal also helps for...

    touching a piece of cold metal also helps for burns.
  13. Replies
    6
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    750

    i believe thats what they are made for....

    i believe thats what they are made for. non-ferrous metals, abrasive plastic and ceramics incl. high-silicon aluminum.
  14. Replies
    72
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    4,284

    and dont forget all the bibles written/painted by...

    and dont forget all the bibles written/painted by standing monks. until about 200 years ago office clerks did their work standing. isnt that much weirder than sitting on the floor?

    edit: about 50...
  15. Replies
    82
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    6,194

    everything that has been said is right, but...

    everything that has been said is right, but doesnt explain why the bar should deflect more (or less) and the start of the hole than at the end of it.

    edit: actually the bore should have less...
  16. Replies
    45
    Views
    3,197

    get the machine. i still have the chinese...

    get the machine.

    i still have the chinese 3-in-1 i bought 25 years ago for $500 and use it almost every day. i can make that part to less than 10µ tolerance on it. you dont need scraped or...
  17. what is a threading gage? a piece of metal with a...

    what is a threading gage? a piece of metal with a 60° triangle in it? iv never used that in my life.
  18. Replies
    82
    Views
    6,194

    interested in the why also. none of my machines...

    interested in the why also. none of my machines does it, but i have been hearing about this for ages, as if it were normal. they usually say the hole gets smaller, i believe. i have not heard a...
  19. Replies
    1
    Views
    382

    high speed steel M2-Al

    does anybody have experience with m2-al (hss-al, w6mo5cr4v2al, hs 4-4-2+al, 501) endmills?

    (m2-al was originally developed in china as an alternative to m35 (hss-e co5) with aluminum instead of...
  20. any kind of heat treatable steel. up to about 50...

    any kind of heat treatable steel. up to about 50 hrc it will get dinged.
  21. Replies
    40
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    2,791

    incredible, these guys must have been reading the...

    incredible, these guys must have been reading the forum. they stole my idea (post #13).

    btw, i have seen epoxies over 10kpsi (70 mpa) tensile. compressive is 50% higher.
  22. Replies
    40
    Views
    2,791

    mma adhesives to my knowledge have no advantage...

    mma adhesives to my knowledge have no advantage on metal in this application. they excel in production environments and for plastics epoxy cant be used on without expensive prep.
  23. Replies
    9
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    904

    the hardened dowel pins i get are hrc60+. no way...

    the hardened dowel pins i get are hrc60+. no way to machine them with carbide. cbn or grind. thre are cbn inserts up to 72hrc.
  24. Replies
    40
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    2,791

    no idea if such a repair makes sence. but: ...

    no idea if such a repair makes sence.

    but:

    - activate the aluminum with some hot lye (oven cleaner?), dry with hot air and proceed immediately
    - if you have some epoxy resin fill it...
  25. Thread: lapping compound

    by dian
    Replies
    20
    Views
    1,824

    its a good point that brownells might be...

    its a good point that brownells might be referring to q+t steel when mentioning "non embedding". scrubbing powder works to a certain extend, but removes sub micron amounts (at least in realistic time...
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