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Goofs & Blunders You Should Avoid.

Discussion in 'GOOFS & BLUNDERS YOU SHOULD AVOID!' started by David S, Jul 24, 2016.

  1. mmcmdl

    mmcmdl H-M Supporter - Premium Content H-M Supporter-Premium

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    Never take your eyes off a 750 lb driveshaft , 15 ft in the air held on with two 1/2" taper pins only . Although we had 3 straps holding onto such shaft , when your pins snap , gravity has a way of shifting the load ( right onto my left hand ) . I had my hand on the edge of the scissor lift and bent down to get the taper pin remover when they sheared . Got me a trip to the ER this past Tuesday , and an invitation into the woodshed for a safety talk . :cautious:
     
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  2. kvt

    kvt Active User Active Member

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    Ouch
     
  3. bobshobby

    bobshobby Australia H-M Supporter - Premium Content H-M Supporter-Premium

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    Yes definitely ouch, would some lessons on rigging come in handy.
     
  4. David S

    David S Canada Active User H-M Supporter-Premium

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    Not sure if this has been mentioned yet. When I machine long tapers on my 618 with the compound, I lock the carriage x travel. I always worry that I may forget and engage the power long feed for another operation. So for the only time that I place anything on the bed, I lay the locking wrench across the ways as a reminder.

    David
     
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  5. Mach89

    Mach89 United States Active Member Active Member

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    Smart thinking. It's amazing how something so simple can save you from a lot of problems later.

    Sent from my SAMSUNG-SM-G891A using Tapatalk
     
  6. R DALE

    R DALE United States Swarf Registered Member

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    THAT IS FUNNY ,,CAN'T WAIT TO TELL THAT ONE TO THE GUYS
     
  7. Screen Guy

    Screen Guy United States Iron Registered Member

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  8. Screen Guy

    Screen Guy United States Iron Registered Member

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    Ok, I'll try again. In the late '70's I did a student overseas thing in Bogata and lived with a local family. When the lights failed in the bathroom, I could no longer shave. I was the only one of shaving age, so I took it upon myself to fix the switch, successfully navigating a local hardware store in broken Spanish. I instructed the maid and the lady of the house in Spanish and English REPEATEDLY no to turn the power back on til I came down from the bath. The maid of course turned the power back on as soon as I was out of sight. I don't know what voltage they use in South America, but it felt excessive to say the least.
     
  9. Screen Guy

    Screen Guy United States Iron Registered Member

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    I can confirm the tempered glass story as a flat glass worker. The slightest knick at the edge and it disintegrates. On occasion tempered glass breaks spontaneously due to stresses set up when the glass was heat treated. Seen it once or twice.
     
  10. jpfabricator

    jpfabricator United States Active User H-M Supporter-Premium

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    I opened my brand new 1/4" center cutting carbide endmill, chucked it up in the mill, and proceed to break it off with the rapid traverse on the power feed. Less than 5 minutes from bringing it through the door, to throwing it in the trash. WHOOO HOOOO!

    Sent from my SM-S320VL using Tapatalk
     
  11. brino

    brino Active User H-M Supporter-Premium

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    You are not the only one of us that's been there......
    -brino
     
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  12. dieselshadow

    dieselshadow United States Do you smell something? H-M Supporter-Premium

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    I've always enjoyed the art of breaking a new tool or part.
     
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  13. wawoodman

    wawoodman himself, himself H-M Supporter-Premium

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    I'm in good company, then.
     
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  14. savarin

    savarin Active User H-M Supporter-Premium

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    Always ensure the chuck jaws are engaged in the spiral.
    Very quickly I set up a half inch wide cut off of a large plastic pipe and used the three jaw to expand outwards on the inside of the pipe so I could true the face.
    OK, nice and tight, start to cut and zoom, bang!
    two of the jaws flew across the room, they had expanded enough to pop out the spiral but the plastic ring kept them in place so I hadnt noticed.
    Luckily I was not in the line of flight.
     
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  15. JPigg55

    JPigg55 United States Active User H-M Supporter-Premium

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    The cost of being lazy and not paying attention.
    I was machining a Tee shaped mounting bracket the other day for a small stepper motor.
    As a final step, I was attempting to make a larger, shallower countersink hole to facilitate a small taper around the shaft bushing instead of a bigger through hole. I opted to use my mill since the piece was already set up there. Long story short, I went too deep and got into my vice jaws. Ouch !!!!
    Luckily, it didn't do too much damage and I was able to smooth off the small boogered up area with a file. Lesson learned.
     
  16. RandyWilson

    RandyWilson United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Learned this one last night. When installing hardware on new cabinets, and the new looking box of bits you found in the FiL's collection just doesn't want to cut, might want to check the packaging and see if you inadvertently grabbed a box of left-handed bits...
     
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  17. David S

    David S Canada Active User H-M Supporter-Premium

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    First time ever for this hobbyist. I was side milling a fairly small part held in the vice on two parallels. I taped the part down onto the parallels while tightening the vise. The part being milled was outside the vise jaws. Long story short one parallel managed to slip forward and crash the end mill. Parallel survived, milling cutter not so much.

    I took a piece of shipping steel banding and bent it into a U to hold the parallels tight against the jaws and also made sure the part was seated firmly on both parallels.

    David
     
  18. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    Sorry for quoting an older post, I was away during that time.

    Funny! Reminds me of Randy Richard on YT. In one of his videos he shows it in action!

    Pretty funny! I'll have to try that sometime!

    http://www.hobby-machinist.com/threads/milling-machine-aka-automatic-brush-roller.32385/
     
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  19. coolidge

    coolidge United States Active User Active Member

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    When running a CNC machine turns your feeds down to 10% on the first part when proofing a new program. This guy in our shop, running a lathe the size of a mini van with a 3 foot chuck and a 6 inch thick boring bar, chucked up a 30 inch cast iron brake drum, hit the green button and let her fly at 100% speed. It knocked the brake drum out of the chuck, it blew the door off the lathe and landed out on the shop floor BOOM. Our shop foreman ran down there and chewed that guy's ass for like 20 minutes. lol
     
  20. Charles Spencer

    Charles Spencer Active User H-M Supporter-Premium

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    When doing an utterly simple calculation it pays to still think about it and double check. I was making an arbor for a 7/8" plain mill cutter. Near as I can recall the old brain figured something like this:

    "hmm, 7/8"? Let's see, 3/4" = 0.750 so 7/8" = 0.875"

    So I then proceeded to turn it down to 0.750". A simple double check would have prevented it.

    Fortunately it was only for 1/2" in length and I had left ample length on my cut off bar stock to fix it.
     
  21. markba633csi

    markba633csi United States Active Member Active Member

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    Coolidge your foreman should have put that clown on the street BOOM
     
  22. pineyfolks

    pineyfolks Active User Active Member

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    Speeds and feeds are always important no matter what the material you're turning.
     

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