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  1. a simple (usually free) excel spread sheet works...

    a simple (usually free) excel spread sheet works better. operator records machining times and reason for delays. then after months to years you can easily see delays and reasons why. for example...
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    . 1) some machines have more trouble at certain...

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    1) some machines have more trouble at certain rpm, for example max rpm in low gear. if machine goes into high gear at 700 rpm you might have more trouble tapping at 600 to 700 rpm
    .
    2) same with...
  3. drill depth to dia ratio has a big effect. ....

    drill depth to dia ratio has a big effect.
    .
    can drill a million shallow holes with no problems and can easily have massive sudden tool failure with deeper drill depths. you should try drilling...
  4. . 1) obviously some aluminum is more abrasive...

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    1) obviously some aluminum is more abrasive (dulls drill faster) and sticks to cutting edges more easily especially if coolant not reaching drill tip. different material can easily effect things....
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    cast iron

    kind of basic apprentice learning of part stability
    .
    cast iron castings are often annealed after casting at a extra charge. if not annealed they can vary more in metal properties that is the metal...
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    . depends on many things including 1) what...

    .
    depends on many things including
    1) what material you are milling
    2) what is cutter made of hss or carbide
    3) length of cutter stickout of holder
    4) length of tool holder
    5) hp of machine and...
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    1,692

    they have had surface grinders, milling machines...

    they have had surface grinders, milling machines and planers for 150 to 200 years now. hand scraping and lapping might be used for final finishing
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    1hp is equal to about 746 watts . if you doing...

    1hp is equal to about 746 watts
    .
    if you doing heavy cutting using 10hp thats 7460 watts thats means heat (like having 5 electric room heaters on making about 25,000 btu of heat)). a lot of heat....
  9. 99% of time rough threads with certain metals is...

    99% of time rough threads with certain metals is just need tapping fluid instead of coolant.
    .
    and obviously going slow rpm has nothing to do with problem as hand tapping is always done slow....
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    . i use a 36" granite square and 6 foot straight...

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    i use a 36" granite square and 6 foot straight edge occasionally. i use a crane. obviously too heavy to pick up. normally stored in a felt clothe lined wood box on wheels. not something you leave...
  11. you rpm to feed slightly off. many old machines...

    you rpm to feed slightly off. many old machines have trouble stopping spindle and it turns extra and screws itself further in. when tap come out of hole you often see it snap back with the spring...
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    1,118

    usually a 36" granite square used with a...

    usually a 36" granite square used with a indicator is enough to check if within .0001" per 36"
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    granite straight edge can be used to see if moving straight can use 6 foot long one. remember every...
  13. Thread: M01 always on

    by DMF_TomB
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    1,689

    could be a parameter issue. could also be...

    could be a parameter issue. could also be optional stop turned on with the program.
    .
    for example program can disable single block and feed hold ability often used in tool change macro and at end...
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    many shop chairs are what the office throws away...

    many shop chairs are what the office throws away when the office gets new chairs. .
    .
    not many complain the office people have too many chairs or are too comfortable sitting in their chairs
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    16,056

    no chairs or stools many will say nothing. they...

    no chairs or stools many will say nothing. they will just start looking for a job some where else.
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    obviously can sit on floor or a 5 gallon plastic bucket but most will just start looking for job...
  16. . . often just clamp 2 pieces of wood with...

    .
    .
    often just clamp 2 pieces of wood with .020" shim between and hole saw a 3" hole through them. when the 1/2 round wood pieces are clamped down to table with tubing in them, with hold down...
  17. 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...
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    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...
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    . with tool holder runout different with each...

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

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    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...
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    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
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    useful if you want R to be rapid down...
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    . usually if you want to keep machine clean and...

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    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...
  23. Thread: Fly Cutting

    by DMF_TomB
    Replies
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    4,281

    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.
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    my point is a series 1...
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    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...
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    . 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...
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