I have had good results by nearly sawing through a matching nut (like a collet)
and holding the bolt and nut in a three jaw chuck. The nut will protect the
threads while you tighten the chuck. Accuracy will depend on the chuck.
Greg
SENT FROM ALCATEL ONETOUCH TABLET
On Aug 8, 2016 3:25 PM, Mike Rambour <lists@dinospider.com> wrote:
>
> Â I have a 1/2" bolt that I need to do 2 things to the end of the bolt.Â
> I need to drill a .125 hole in the middle for about a half-inch and turn
> the end down to .39, the bolt itself is 2.5 long and 1/2" diameter.
>
> Â I tried chucking it up in my 3 jaw chuck and I can't get tightened
> down without wobbling all over and the hole I need to drill would not
> end up in the middle of the bolt, also the turned down part would never
> be right. I have tried quite a few different things to get tightened
> down without wobbling all without success. The lathe (shoptask
> bridgemill) came with a 4 jaw chuck that i never installed, would that
> help ? I am at the point where I am thinking of cutting off the bolt
> head, doing the machining and then welding the bolt head back on.
>
> Â This is non-critical part, so not worried about strength, just needs
> to be finger tight when installed but that .39 x .450 long machined endÂ
> with the hold is critical to fit.
>
> Â I am NOT a machinist by any stretch of the imagination, I bought this
> shoptask 5 years ago and only used it once so far, I had a old sherline
> mini lathe that was way under powered for what I did with it and I used
> a lot so I decided with a bigger lathe I would get to do more things...I
> was wrong. I don't know what I am doing and sometimes too scared to try
> and mess up my parts.
>
> Â But I am getting to the point in my current project where I can see
> use for this thing. I have a plate that I need to mill down and instead
> of taking it to a shop to have it done, I am going to try it on my own,
> its just a carburetor spacer, nothing critical measurement wise. If I
> mess it up, its only a $20 part that I can buy, so I will try it out.
>
> Â Once I get past this bolt thing...
>
> Â Â Â Â mike
>
>
> --
> A gun is like a parachute, if you need one but don't have it,
> you'll probably never need one again.
>
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