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  1. #1
    Join Date
    Sep 2005
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    campbelltown NSW
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    623

    Default Any ideas most welcome!..

    G'Day all,
    Just bought a chunk of 50mm round bar and wish to turn it down, problem is the jaws of the chuck fall out at 50mm so I can not hold it safely to even turn the end down for a more secure grip. Is my only choice to buy a larger chuck?.. Or is there a way to hold it with the chuck I have?...I have thought about finding the centre, use a 12mm drill and go in about 5mm, then weld a short smaller dia bar that I can get a safe grip on it in the chuck, do you think this would work?....:confused:
    savage(Eric)

    Never, under any circumstances, take a sleeping pill and a laxative on the same night.

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  3. #2
    Join Date
    Oct 2006
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    Newcastle
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    Default

    what you suggest may work if you can get a good weld on it, the trick will be welding it on centre.
    you dont say what type of chuch your using, if its a four jaw you should be able to reverse the jaws.
    the other alternative is to turn it between centres

    JMT

  4. #3
    Join Date
    Sep 2006
    Location
    Perth
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    Default

    If you have a faceplate and a dead center for your spindle and tailstock, you could turn it between centers. Install the faceplate and dead centers, center drill the two ends of the bar stock, mount it between centers. You need a lathe dog of some kind to then turn the stock - you could jerry rig something easily enough, perhaps drill and tap a hole in through the end.

    Another method would be to drill and tap a whole in the end, insert a bolt and tighten it up (perhaps usie locktite as well), center drill the other end, and then hold the bolt head in the chuck and the other end in the tailstock live/dead center.

  5. #4
    Join Date
    Aug 2006
    Location
    Sydney
    Posts
    49

    Default

    Savage,
    Small chuck if it cannot hold 50mm. My 4 jaw is 630 mm dia & will swing 710mm in gap.
    Can you buy a set of external jaws for your chuck? also called reverse jaws.

    Regards
    Den.

  6. #5
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    Sep 2005
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    campbelltown NSW
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    Quote Originally Posted by Oldhack View Post
    what you suggest may work if you can get a good weld on it, the trick will be welding it on centre.
    you dont say what type of chuch your using, if its a four jaw you should be able to reverse the jaws.
    the other alternative is to turn it between centres

    JMT
    Quote Originally Posted by cub3 View Post
    Savage,
    Small chuck if it cannot hold 50mm. My 4 jaw is 630 mm dia & will swing 710mm in gap.
    Can you buy a set of external jaws for your chuck?

    Regards
    Den.
    Quote Originally Posted by peternl View Post
    If you have a faceplate and a dead center for your spindle and tailstock, you could turn it between centers. Install the faceplate and dead centers, center drill the two ends of the bar stock, mount it between centers. You need a lathe dog of some kind to then turn the stock - you could jerry rig something easily enough, perhaps drill and tap a hole in through the end.

    Another method would be to drill and tap a whole in the end, insert a bolt and tighten it up (perhaps usie locktite as well), center drill the other end, and then hold the bolt head in the chuck and the other end in the tailstock live/dead center.
    Thanks Guy's I knew someone out there would have an idea.

    Peter as I am just starting to turn metal, my gear is a bit on the lean side so your second option will be Plan "B", Thanks for the reply.

    Den, I was thinking about a 4 jaw chuck, as I will need one sooner or later, I guess it could be sooner. If all else fails that will be Plan "C", Thanks for the reply.

    JMT, I only have a smallish 3 jaw chuck, but you may have hit the nail on the head, as each jaw is stepped, but I think the steps are on the outside not the inside, (if you know what I mean), I don't think I can reverse the jaws in the chuck. Thanks for the reply.
    savage(Eric)

    Never, under any circumstances, take a sleeping pill and a laxative on the same night.

  7. #6
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    Aug 2006
    Location
    Sydney
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    49

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    Eric,
    Sorry it's plan C :confused: you should be able to to buy said jaws for a 3 jaw chuck, very useful.

  8. #7
    Join Date
    Nov 2001
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    Wallan, VIC, Australia
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    377

    Default

    Grind some flats so it will fit in the chuck?
    Ray

  9. #8
    Join Date
    Sep 2004
    Location
    Glenhaven, NSW
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    Default

    Eric,
    If your lathe is new, your chuck should have a set of "outside grip" jaws in the accessory box if the present jaws have curved teeth to engage the scroll, but if the jaws have straight teeth, they can be reversed. My lathe came with a 3 jaw and a 4 jaw chuck but the 4 jaw was so sloppy, it was useless. I bought a much better one from H&F - their cheapest! and bolted it to the backing plate of the original one after removing the jaws.
    I couldn't do without the 4 jaw independent now.
    Cheers
    Graeme

  10. #9
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    Oct 2006
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    Quote Originally Posted by Oldhack View Post
    what you suggest may work if you can get a good weld on it, the trick will be welding it on centre.
    you dont say what type of chuch your using, if its a four jaw you should be able to reverse the jaws.
    the other alternative is to turn it between centres

    JMT
    I agree with u!!!!

  11. #10
    Join Date
    Sep 2005
    Location
    campbelltown NSW
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    67
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    623

    Default

    Quote Originally Posted by cub3 View Post
    Eric,
    Sorry it's plan C :confused: you should be able to to buy said jaws for a 3 jaw chuck, very useful.

    Quote Originally Posted by zathras View Post
    Grind some flats so it will fit in the chuck?

    Quote Originally Posted by graemet View Post
    Eric,
    If your lathe is new, your chuck should have a set of "outside grip" jaws in the accessory box if the present jaws have curved teeth to engage the scroll, but if the jaws have straight teeth, they can be reversed. My lathe came with a 3 jaw and a 4 jaw chuck but the 4 jaw was so sloppy, it was useless. I bought a much better one from H&F - their cheapest! and bolted it to the backing plate of the original one after removing the jaws.
    I couldn't do without the 4 jaw independent now.
    Cheers
    Graeme

    Quote Originally Posted by beglobal View Post
    I agree with u!!!!

    Cub, Greame, Thanks you where right on the money, Cub, you where right in the respect that the jaws are changable with another set (reversible). Greame, you where right as I went out and looked through the box of bits that came with it and sure enough there they where wrapped up in a tight little bundle under all the spare gears, and I found another morse taper I was unaware of. So now I have a large and small taper and a set of reversible jaws, when it was delivered I didn't even get an instruction booklet so I was unaware of what came with it. The guy just said it was a box of spares, the tools came in a bag separate and he said it was ready to go!....

    Zathras, thanks for your input as that was a consideration I was toying with.

    Beglobal, What can I say but glad you agree!... Seriously, thanks for taking the time to read my thread.
    savage(Eric)

    Never, under any circumstances, take a sleeping pill and a laxative on the same night.

  12. #11
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    Sep 2005
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    campbelltown NSW
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    Yay!....It's in, and I'm going to start turning tomorrow, Thank's again for all your help!....
    savage(Eric)

    Never, under any circumstances, take a sleeping pill and a laxative on the same night.

  13. #12
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    Default

    Good to hear it was an easy fix, and you got the right info with no dramas from the forum members! Its a great place to swap info and experience!!
    I've had the same problem, v. embarassing to keep winding the jaws out, and to avoid repeating, maybe write the max. diameter on each set of jaws in oil pen.

    Cheers,
    Andy Mac
    Change is inevitable, growth is optional.

  14. #13
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    Quote Originally Posted by Andy Mac View Post
    Good to hear it was an easy fix, and you got the right info with no dramas from the forum members! Its a great place to swap info and experience!!
    I've had the same problem, v. embarassing to keep winding the jaws out, and to avoid repeating, maybe write the max. diameter on each set of jaws in oil pen.

    Cheers,
    Yes, I must agree Andy, just about 99.99% members here are good people and the 0.01% don't matter anyway.

    I did find out that when changing the jaws, they each have there own slot they fit into or they do not centre equally. So I am going to engrave each jaw to it's home slot.

    Last time I did any turning wood or metal was a long time ago in school, but I know I am not alone there, as some members have stated that fact numerous times before me.
    savage(Eric)

    Never, under any circumstances, take a sleeping pill and a laxative on the same night.

  15. #14
    Join Date
    Jan 2004
    Location
    Mackay Qld
    Posts
    3,466

    Default Holding 50mm bar to machine.

    For those without a 4 jaw chuck, I was able to do this on a big 3 phase.
    The 3 jaw is far too heavy to remove with mechanical assistance,which I did not have.

    Hex bar fits real well in a 3 jaw chuck. I found center on 1 end by using a centrefinder and pop marked it.. Marking a circle with dividers, the od of the hex bar, I was able set it up on centre. I tacked every other flat with the welder. Good tacks- higher than normal amps ,ok!

    Used a live centre on the other end. Not fitter and turner like but if you can't weld, heat,or hammer it takes the fun out of turning.

    Spun it up real careful like, as them big chunky bits can get nasty if they come loose.

    There is always a way, if you take care.

    Grahame

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