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  1. Replies
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    . hard metal or hard spots in metal (usually...

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    hard metal or hard spots in metal (usually slag)
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    not all metal is the same, SS also varies if work hardened (for example from cold rolling) or annealed. effects machinability and tool life
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    nylon abrasive cloth will usually clean rust and...

    nylon abrasive cloth will usually clean rust and dirt. then wipe with clean shop rag
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    point is runout can be 1) from end mill itself...

    point is runout can be

    1) from end mill itself not made with zero runout

    2) from each machine spindle or each machine has runout in theory measure with a test bar AND of course when runout...
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    . who said end mill was sharpened with zero...

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    who said end mill was sharpened with zero runout of end cutting edges to the shank ?
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    record runout on 100,000 tools in tool holders and compare runout amounts to tools you know for sure had...
  5. . some materials give abrasive wear to inserts...

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    some materials give abrasive wear to inserts and tool life is never very high. and if material has large hard spots of slag sudden tool failure can be a problem, this can give random problems
    ....
  6. . in China I have seen electric meter you used...

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    in China I have seen electric meter you used a electronic device to load credit on it and as the KW are used if its used up the meter stops supplying electricity. you went to "post office" and...
  7. i have seen 3D milling with ball end mills. or...

    i have seen 3D milling with ball end mills. or radius corner end mills. take a lot of time but mills many odd shapes
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    time based on finish. fewer passes quicker but rougher
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    corncob mills common for longer stickout and...

    corncob mills common for longer stickout and heavy removal
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    like 1.5" DOC and 1.5 WOC removing large amounts and taking over 5hp with 2" dia mills. obviously if mill has 12" long flutes depth and...
  9. a rougher usually to nearest degree ok obviously...

    a rougher usually to nearest degree ok obviously depends on part design. many features not at 90 degree increments. but often at 45 degree for example
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    a finisher sometimes recuts done at .001...
  10. old level they usually use plaster and softens...

    old level they usually use plaster and softens with water. obviously newer glue like silicone and or instant glues more difficult to remove. sometimes its a one shot thing not meant for repairs. you...
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    viruses can infect date. non rewrittable backups...

    viruses can infect date. non rewrittable backups have some advantages. if person edits file on purpose or accidentally often thats not desired.
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    many make copies of critical files with filename...
  12. usually pallets go to setup station where...

    usually pallets go to setup station where overhead hoist or crane is used. once parts get over 20 lbs and especially 40 lbs most not moving heavy parts without a hoist or crane. fixtures, columns and...
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    . i got external harddrive that has special...

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    i got external harddrive that has special software drivers for older version of windows and company no longer in business so no new drivers for windows 7 or newer. thats been decade problem old...
  14. . no ideal on cost. curvic gear every 1 degree...

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    no ideal on cost. curvic gear every 1 degree has stronger clamp ability for roughing. many a rotary table will fault if moves .01 degree or .001 degree so same part needs to run at reduced feeds...
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    . 304 can have hard spots of slag in it of...

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    304 can have hard spots of slag in it of course. you hit slag and bam drill gets damaged. literally can drill million holes over many decades and no problems and switch 304 and break drills 10x a...
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    fancy term "logistics" ordering, shipping stuff...

    fancy term "logistics" ordering, shipping stuff on time.
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    like stores saying theirs a coin shortage. more likely too many not at work or school using coins on vending machines. normal supply...
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    higher demand than usual create shortages. HF...

    higher demand than usual create shortages. HF stores selling so much stuff shelves are empty of a lot of stuff and stuff not coming in fast enough
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    people buying more beer and pop same as toilet...
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    2,179

    supply and demand. getting extra $600./week plus...

    supply and demand. getting extra $600./week plus unemployment plus $2400. from feds people buying more beer and steak, stores got plenty of hot dogs not many want cheap stuff
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    like coin shortage....
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    many machines get turcite worn slides unevenly....

    many machines get turcite worn slides unevenly. its like a 4 leg chair sitting on 3 legs as the weight shifts 1 leg goes down and other leg goes up. the forces required can be high, more than a...
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    1,591

    . oversize tap normally only used on heat...

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    oversize tap normally only used on heat treated parts where hole gets smaller and or out of round after heat treatment and H number varies based on size of tap
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    many paint tap shank green that...
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    . as a apprentice 40 years ago i saw grinding...

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    as a apprentice 40 years ago i saw grinding wheels being bored out bigger ID hole on a lathe with a old end mill as a boring bar at relatively slow rpm. obviously it will dull end mill but it...
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    many a finishing mill needs to cut 3 or 4 feet...

    many a finishing mill needs to cut 3 or 4 feet before its stable. that is it needs to wear in a bit. have seen over .0005" height differences in finished surfaces before.
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    as tool dulls and part...
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    is their a chapter on sudden tool failures,...

    is their a chapter on sudden tool failures, hitting slag hard spots, false cutting edge buildup, tool vibration harmonics ?? part vibration harmonics ?? and obviously vibration can change where tool...
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    a winch or chainfall is safer way to go. heavy...

    a winch or chainfall is safer way to go. heavy item rolling up or down ramp easy to loose control fast. its human nature to try to stop but heavy items can often be too much to stop and it can happen...
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    not only a badly sharpened drill but a drill bit...

    not only a badly sharpened drill but a drill bit that hit a hard spot of slag can get damaged and drill oversized holes.
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    i have even seen carbide drill damaged drill holes .040" oversize before....
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