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Don't run the boring bar into the chuck jaws on the end of the hole

Discussion in 'GOOFS & BLUNDERS YOU SHOULD AVOID!' started by Hukshawn, Feb 11, 2017.

  1. Hukshawn

    Hukshawn Canada H-M Supporter - Premium Content H-M Supporter-Premium

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    Glad to say I have yet to smash the chuck on the carriage.
    But, I have, however, dropped the 6" 4 jaw on my hand unscrewing it from the spindle... I suppose better bruise my hand than damage the ways.....
     
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  2. bobshobby

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

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    That reminds me of why I don't have a DRO. I always thought "Hobby Machining" was all about doing it manually, the original way, you know hands on. But I guess there will always be those who want explore new territories, like DRO's, CNC and all sorts of other tricks. One should always have, and use a carriage stop I'm thinking of designing one that will trip the feed. But too many other things to do at the moment.

    BTW. I haven't had a chuck or cutter crash since I was an apprentice, but I did have a few back then. Fortunately our Toolroom Foreman was a very wise and kind person, after a crash he would discuss the reasons for the crash with us, bringing all the apprentices together for a show and tell. while the poor victim was very embarrassed he was kind and helped us to understand all the inherent dangers of all the machines we had in our shop, and they were many. I have often felt since those days that I and my fellow apprentices (all 8 of us) were very lucky in that we had a very diversified training under the eye of a great foreman and his 3 leading hands plus all the toolmakers in the shop, usually 12 to 15 of them
     
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  3. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    My lathe has a foot brake, and it is pretty useless like the other controls when something unexpected happens. By the time you get it stopped it has probably already bashed something pretty good. However, the foot brake is perfect when you are anticipating needing to use it. I have used it for metric internal threading tight up to a shoulder, leaving the half nuts engaged. No problem. My foot brake stops the spindle instantly if I have my foot resting on it and am mentally geared up to use it, even at higher speeds. I occasionally find it really useful.
     
    Last edited: Feb 19, 2017
    bobshobby likes this.
  4. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    Speaking of foot brakes, I've seen some lathes (imports) that have a foot pedal connected only to a cut off switch, all it does it cut power to the spindle & does not actually have a physical brake on the spindle. I've always wonder what's the point in that setup?

    My lathe does have a real foot brake, cuts spindle power & has a physical drum brake inside the spindle pulley. I love having a foot brake. But I use it only for convenience, I've never had to use it to try & prevent a crash.
     
  5. utterstan

    utterstan Canada Active Member Active Member

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    I missed it by that much LOL to funny
     
  6. The Liberal Arts Garage

    The Liberal Arts Garage United States Active User H-M Supporter-Premium

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    Make a simple box , bandsaw or whatever the top, suitable for lathe and
    Chuck so that the chuck only drops 3/8" or
    so. Install or remove chuck safely with twenty minutes invested. ......BLJHB.
     
    4gsr likes this.
  7. petertha

    petertha Canada H-M Supporter - Premium Content H-M Supporter-Premium

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    What I try to do beforehand to protect myself is set my boring tool max depth & then use my homebrew stop which limits any further carriage travel. Actually I have 2 of these so I can put one on the other side of the carriage like when you have to bore a recess groove within 2 limits. You don't want to drive into them under power & they don't shut anything off. I just power feed until close & then traverse in my hand until the carriage kisses the stop, then repeat.
     

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  8. Fozzy Bear

    Fozzy Bear United Kingdom Swarf Registered Member

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    Yeah... It's one I've done too a long time ago. Once you've done it for the first time you never do it again.

    Best Regards,
    Fozz
     
  9. Hukshawn

    Hukshawn Canada H-M Supporter - Premium Content H-M Supporter-Premium

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    Nice carriage stops. I need to make one for sure. I'd like to save the pictures to make some myself, but it won't let me save. Huh...
     
  10. intjonmiller

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

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    How are you viewing the photos? It's very easy in Tapatalk. Should be just as easy in a web browser. Tapatalk even lets me upload them directly to my Google drive where I store projects and stuff, to then be viewed later on a tablet.
     
  11. petertha

    petertha Canada H-M Supporter - Premium Content H-M Supporter-Premium

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  12. bobshobby

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

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    I would love to have a foot brake, but unfortunately I would have had to go up a size to get one and that machine would not fit in the space I have, however as I said I'm thinking about making a carriage stop that will trip the feed, not a total solution, but a move in the right direction. I'm even thinking of how to fit a clutch/brake to the lathe, any ideas would be welcome. I'm thinking in terms of an automotive electric A/C clutch fitted to the motor. They can usually handle quite a few HP. and a second one fitted to the pulley at the lathe end of the belt, set up as a brake. Could be set up with a button connected to a foot bar to simultaneously disengage the motor and apply the brake, a separate lever could be used just as a clutch. I like the idea of a clutch very useful when doing a lot of stop/start work.
     
  13. bobshobby

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

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    It's always a good idea to place a wooden board on the bed under the chuck when removing, also useful when putting large heavy items in or out of the chuck.
     
  14. TORQUIN

    TORQUIN United States Active Member Active Member

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    One thought on emergency braking that comes to mind is the braking power of a VFD. I have mine set for gentle braking, but could ramp it up. I suppose it depends on the VFD, but they might be able to stop that motor very quickly. Rig up your emergency switches/stops to go through the VFD and it may work well.

    Chris
     
  15. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    This is my carriage stop, but I do not recommend it.
    It is very noisy!
     

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  16. petertha

    petertha Canada H-M Supporter - Premium Content H-M Supporter-Premium

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    That's the metric clone. Each of the inscribed rings is mm of interference, so just divide by 25.4 to get inches of crash :)
     

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