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  1. Replies
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    . 3/8 carb end mill is extremely cheap compared...

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    3/8 carb end mill is extremely cheap compared to 1" dia end mills. SS often varies and if you hit a hard spot or slag thats big enough it will damage any end mill.
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    very hard to predict tool...
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    413

    . your doing good with SS, usually better to...

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    your doing good with SS, usually better to change end mill after 60 minutes rather than risk sudden tool failure
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    tool life normally 20 to 60 minutes with SS,...

    tool life normally 20 to 60 minutes with SS, number of parts dont mean much its how much cubic inches of metal you are turning into chips.
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    some SS you lucky to get 1 or 2 parts per end mill
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    413

    . loosing corners usually too much ipt feed, too...

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    loosing corners usually too much ipt feed, too much depth and width of cut, too much sfpm. and if hitting slag or hard spots that obviously hard on cutter
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    if metal is 200% harder to machine...
  5. Replies
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    413

    cold rolled and work hardened 304/316 SS...

    cold rolled and work hardened 304/316 SS typically has a machinability rating of
    0.2 cubic inches per min per hp as compared to
    annealed thats about
    0.4 cubic inches per minute per hp
    .
    so...
  6. . with cnc, parts not normally have layout lines...

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    with cnc, parts not normally have layout lines and center punch marks
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    sure manual machining might need to do depends on what shop equipment you have. if you got rotary table many times still...
  7. most places where you work they got book shelves...

    most places where you work they got book shelves and or drawers full of machine manuals and modern times the electronic pdf versions are available
    .
    then there are work instructions, procedures...
  8. cnc often similar enough to be confusing. that is...

    cnc often similar enough to be confusing. that is different cnc might need slightly different operation and even programming
    .
    for example one cnc
    M6 T10000001;
    for tool change and on another...
  9. Replies
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    ? maybe not far enough away and when tool radius...

    ? maybe not far enough away and when tool radius comp turned on it moves tool into programed line / arc. or its already into cut line/arc and tool comp moves it out
    many cnc have parameter setting...
  10. Replies
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    9 ipm feed at roughly 3" depth thats 20 seconds...

    9 ipm feed at roughly 3" depth thats 20 seconds and with pecking maybe 1 minute ? full peck usually set for dia of drill or .38 peck roughly 8 pecks
    .....if rapids when pecking are over 200 ipm each...
  11. Replies
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    usually boring head is just a more easily fine...

    usually boring head is just a more easily fine adjustable flycutter. most but not all boring heads take inserts which normally are made for boring or facing often they dont have cutting edges for...
  12. they put a motor hp size that matches the...

    they put a motor hp size that matches the strength and rigidity of the machine. putting higher hp motor aint going to help the whole machine from shaking or vibrating which will damage cutting tools...
  13. most shops want at least 2 people on a shift in...

    most shops want at least 2 people on a shift in the shop area in case one needs help or in trouble or just needs some advice or consulting on something
  14. often 1" dia roughing end mill will take what a...

    often 1" dia roughing end mill will take what a bridgeport can give
    .
    i often use 1.75 to 4" dia roughing end mills on bigger machines and they easily can need 5 to 10hp, bridgeport cant handle it
  15. . i check all npt threads with a npt thread plug...

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    i check all npt threads with a npt thread plug gage thats been checked by calibration
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    more likely get fired for eyeballing threads of tap visible above hole as only way of checking threads
  16. roughing end mills with wavy flutes tend to be...

    roughing end mills with wavy flutes tend to be more efficient at removing higher cubic inches per min per hp. also higher ipt feed even if you need to reduce depth or width of cut is more energy...
  17. . . usually free tooling catalogs on the...

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    .
    usually free tooling catalogs on the internet and the machine manuals of more modern machines are free on the internet too. often machine manuals specific to you particular machines are in the...
  18. Replies
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    . when you have 10,000 rpm compared to 10 rpm...

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    when you have 10,000 rpm compared to 10 rpm the cutting force is literally 1000 times different when slower to remove the same cubic inches of metal per minute.
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    like a hydraulic jack can move...
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    . . create / draw curve on edges which can be...

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    create / draw curve on edges which can be straight or round like on a hole, watch corner radius and chamfers if small you can be selecting wrong ones
  20. Replies
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    . normally wouldnt plunge deep with no pilot...

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    normally wouldnt plunge deep with no pilot hole. bridgeport tends to shake and or vibrates easily. as hole gets deeper the hole will steady end mill shaking so its often bellmouthed 1st 0.1" depth...
  21. many fixtures made for specific part. . if you...

    many fixtures made for specific part.
    .
    if you needed to hold a 90 degree pipe elbow obviously you need a fixture to hold that specific shape. without fixture often its often impossible to machine...
  22. Replies
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    swiss machining, stick out, turn it, then stick...

    swiss machining, stick out, turn it, then stick out some more and turn some more
    .
    swiss lathes do this automatically some how, on a manual lathe you manually do it
  23. Thread: thread chart

    by DMF_TomB
    Replies
    5
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    492

    . usually 4 levers and L B 2 R are where they...

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    usually 4 levers and L B 2 R are where they need to be set.
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    had a threading job where i could start nut but the more i screwed it on threads the tighter threads got. eventually figured out the...
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    . could be as simple as part and or fixture...

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    could be as simple as part and or fixture vibrate more in one direction than another. slides often slip stick slip stick. way oil or ability to move smoothly can vary depending on slide design....
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    . beware or be careful of . 1) people trying...

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    beware or be careful of
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    1) people trying to sell stuff. typically saying you need something to maintain job, keep up with the competition, be one of the best, etc
    .
    2) people giving risky...
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