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  1. T

    Adjusting a 3 jaw in a rotary positioner?

    Yep. Its a new grizz positioner- made in taiwan, it locks up tight, has a smooth action. Threads are so so, some sharp corners. When I took the jaws apart I noticed that one jaw had a lot more removed from it, while another barely had any. 2 still had the grooves in the jaws, one was...
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    Adjusting a 3 jaw in a rotary positioner?

    I came here to ask for help not listen to BS from a boomer. I just got it to .003" with no help from you. I don't even have 30 years experience. The problem with old people is that they have their ways and don't have a open mind to anything new, and they miss out on the world. Your replies are...
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    Adjusting a 3 jaw in a rotary positioner?

    YES! success. So I recheck the runouts on my mill in all axis, was less than a .001. This time I used a left over ground rod that was 1.00". Put that in the positioner, then aligned it to 1 jaw that was perpendicular to the bit. I was trying to cut one jaw at a time as a offset to the...
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    Adjusting a 3 jaw in a rotary positioner?

    .010" I assumed by turning the postilion with a light cut it would center the jaws even with the run out.
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    Adjusting a 3 jaw in a rotary positioner?

    Thanks, I did not take that much off, but I had very smooth cuts on the jaws. I might have to try another cut.
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    Adjusting a 3 jaw in a rotary positioner?

    It's not unacceptable if its fixed, apparently you have no idea how to fix it, so no need to reply anymore Its "practical" machining, not spend money on tools machining. A true craftsman will make his tools work, and a business won't spend money when that's not required. I have a grizz lathe...
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    Adjusting a 3 jaw in a rotary positioner?

    Thats about where I'm at since No one can give me info on why my truing setup dint work.
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    Adjusting a 3 jaw in a rotary positioner?

    While I appreciate that, that's not what I need. My lathe can do that but I need a positioner for simple muzzle breaks, And I can't drop more money for accuracy I will never use.
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    Adjusting a 3 jaw in a rotary positioner?

    that was .0005" on barrels. the rotary just nees to be w/n .005" to do muzzle brake holes thanks
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    Adjusting a 3 jaw in a rotary positioner?

    I know its taiwan but .060" run out? I have a lot of grizz stuff but its never this bad.
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    Adjusting a 3 jaw in a rotary positioner?

    Okay I have a rotary position/index table that I added a 3 jaw to. Back plate was cut on a lathe with a threaded rod ( I cut 1.125" -8" IIRC) that fit the back plate. I faced/plug cut then turned diameter to fit 3 jaw. I mounted it to index table after mounting the back plate. Back plate was...
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