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  1. the most important factors are . 1) stickout...

    the most important factors are
    .
    1) stickout length to diameter ratio
    2) tool holder length
    3) machine rigidity
    4) part rigidity
    5) work holding rigidity
    6)if circular milling a bore, the...
  2. Replies
    7
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    556

    it takes roughly 1 hp to make 0.8 cubic inches of...

    it takes roughly 1 hp to make 0.8 cubic inches of chip of 1018 steel per minute. to get 1hp at spindle its common to need a 1.5hp motor cause of belt and gearing power loses.
    1/4hp would be be for...
  3. Replies
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    932

    . with tool holder runout different with each...

    .
    with tool holder runout different with each machine spindle and with tool deflection you cannot measure to .001mm repeatability. even a tool presetter it is common to measure and then have it bore...
  4. Replies
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    1,620

    . the bigger and thicker the insert the more it...

    .
    the bigger and thicker the insert the more it costs but it can usually take more and cut a lot more faster. often 200% or more faster. ipt feed some bigger inserts can take .010 to .020" ipt where...
  5. Replies
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    1,736

    G98 and G99 and G83 and G73 can be used many...

    G98 and G99 and G83 and G73 can be used many ways. point is G98 at end on drilling EACH hole it goes back to initial Z and not to R like it does with G99
    .
    useful if you want R to be rapid down...
  6. Replies
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    1,253

    . usually if you want to keep machine clean and...

    .
    usually if you want to keep machine clean and rust free often just a plain mineral oil like air tool oil works moderately well. the residue is relatively easy to clean, not sticky and it helps...
  7. Thread: Fly Cutting

    by DMF_TomB
    Replies
    29
    Views
    3,682

    the set screw key for R8 collet keeps it from...

    the set screw key for R8 collet keeps it from spinning and damaging taper. so its a choice stall motor if cutting too much or have collet spin damaging taper on overload.
    .
    my point is a series 1...
  8. Replies
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    1,736

    if using short peck G73 you can G0 G98 Z2.0 G73...

    if using short peck G73 you can
    G0 G98 Z2.0
    G73 X0. Y0. Z-5. R-2.9 Q0.5 F3.
    G73 X0. Y0. Z-6. R-4.9 Q0.5 F3.
    G80
    .
    it rapids to R-2.9 into hole from Z2.0 short peck drills to Z-5.
    pulls out...
  9. Replies
    22
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    1,736

    . i believe its usually use G98 or G99 to set...

    .
    i believe its usually use G98 or G99 to set initial Z
    G0 G98 Z2.0
    G83 X0. Y0. Z-6.0 R-2.9 Q0.5 F3.
    X2.0
    G80
    ....so initial Z set for Z2.0 it rapids to R-2.9 down into hole and peck drills to...
  10. i wouldnt start any job without extra end mills. ...

    i wouldnt start any job without extra end mills.
    .
    and doing small lot or short run jobs it rarely pays to push feeds and speeds and sacrifice reliability. sudden tool failure can damage not only...
  11. Replies
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    1,351

    . i would look for damaged shear pins, bent keys...

    .
    i would look for damaged shear pins, bent keys and keyways, and collision or crash marks. also lack of lubrication damage is hard to see.
    .
    wear on the ways is minor compared to collision or...
  12. when not using a tapping cycle and just using G1...

    when not using a tapping cycle and just using G1 the danger is feed and rpm not at 100%. most tapping cycles ignore override selection and tap as programmed.
    .
    just saying if you are on 80% feed...
  13. Thread: Fly Cutting

    by DMF_TomB
    Replies
    29
    Views
    3,682

    i have damaged key and key way on bridgeports...

    i have damaged key and key way on bridgeports before flycutting up to stall point. its easy to do manually milling. boss gives you a job and wants it done as fast as possible. when on low gear you...
  14. Thread: Fly Cutting

    by DMF_TomB
    Replies
    29
    Views
    3,682

    . usually a series 1 bridgeport has 1 hp at...

    .
    usually a series 1 bridgeport has 1 hp at spindle (after gearing) and it will vibrate and chatter a lot when you get near using 1hp plus more importantly a R8 collet has a little setscrew key that...
  15. Replies
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    1,872

    . usually cause 1 to 1 ratio as bit extended out...

    .
    usually cause 1 to 1 ratio as bit extended out in radius its length comes out same amount at 45 degree. Devlieg microbore units are threaded and you use dial for 90 degree or 45 degree so dial...
  16. Replies
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    3,794

    . i have worked on many less rigid and low hp...

    .
    i have worked on many less rigid and low hp machines. and i have had to remill many parts made on subspindle lathes that had so bad chatter vibration marks on them they got sent to cnc mill to...
  17. Replies
    24
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    3,794

    never had a problem running carbide slow. its not...

    never had a problem running carbide slow. its not slow its a sfpm and feed that works better with
    1) stickout length of end mill
    2) tool holder length
    3) machine rigidity and hp limits
    4) part...
  18. Replies
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    1,970

    . usually they have a reverse but i suppose its...

    .
    usually they have a reverse but i suppose its not guaranteed on every one made. obviously how chuck is mounted effects things. a simple screw on thread mount for chuck would unscrew in reverse. it...
  19. Replies
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    669

    many free tooling catalogs contain vast info on...

    many free tooling catalogs contain vast info on machining, feeds and speeds and chip appearance and cutting edge wear. almost all is in pdf form on internet
    .
    not every manufacturer but some have...
  20. some dating sites women only looking for college...

    some dating sites women only looking for college educated men with college degrees.
    .
    or you go to party and others ask what you do for a living and basically can tell you are being looked down on...
  21. Replies
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    2,398

    let me know when a part cost of material and...

    let me know when a part cost of material and labor and machine costs and maintenance costs is less than $10./lb total part cost per 1000 parts per year average
    .
    just saying add up all the costs or...
  22. Thread: Fools Game

    by DMF_TomB
    Replies
    24
    Views
    1,678

    their's more money to be made speaking and...

    their's more money to be made speaking and writing books if you say certain things.
    .
    media will put in news many comments and opinions if it fits what they want to be in the news. obviously if...
  23. snops

    many are snops or think they are better than others. often its a job security and or high pay rate thing.
    .
    i have also seen senior machinist not want to train others figuring it will make them...
  24. there are snops in all cultures. that is people...

    there are snops in all cultures. that is people who think they are better than others and there can be hundreds of reasons. even machinist have a pecking order for example programmer, mold maker,...
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    1,093

    winding a spring is normally not hard to do. it...

    winding a spring is normally not hard to do. it will flex back so you might have to try a few different sizes winding so when free its correct size.
    .
    when you cut it free springs will spin hard...
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