Subject: Re: [Shop-talk] turning the end of a bolt.

From: Dave Cavanaugh <[email-masked]>
Date: Mon, 8 Aug 2016 18:23:35 -0700

Put another nut (or two) the the same size as the bolt head on the 
threaded portion, run it down to the bottom of the threads, align all 
the flat faces and put it in the chuck.  It'll be straight enough.  The 
nut or nuts don't need to be tight, they are just there for alignment in 
the jaws.

On 8/8/2016 1:25 PM, Mike Rambour wrote:
>  I have a 1/2" bolt that I need to do 2 things to the end of the 
> bolt.  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.
>
>  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.
>
>  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 
> end  with the hold is critical to fit.
>
>  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.
>
>  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.
>
>  Once I get past this bolt thing...
>
>     mike
>
>

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From: John Miller <[email-masked]>
Date: Tue, 9 Aug 2016 07:20:49 -0700

On 8/8/2016 6:23 PM, Dave Cavanaugh wrote:
> the flat faces and put it in the chuck.

This worked for me as well.

Done it a few times, but most notably I've got a spare-tire mount on my 
trailer that's got a 1in (I think) bolt thru a plate to retain the 
wheel, I cut the threads off the last inch and a quarter or so of the 
bolt, milled flats on the sides, and drilled it for a padlock.

Cutting the threads off will require a fairly high speed and shallow cut.

John.

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From: John Innis <[email-masked]>
Date: Thu, 11 Aug 2016 09:12:50 -0500

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Another way to do this is rough grind the threads off on a bench grinder
and then finish on the lathe.  As long as you are careful no to go too deep
on the grinder, it makes the lathe work a lot easier.

On Tue, Aug 9, 2016 at 9:20 AM, John Miller <[email-masked]> wrote:

> trailer that's got a 1in (I think) bolt thru a plate to retain the wheel, I
> cut the threads off the last inch and a quarter or so of the bolt, milled
> flats on the sides, and drilled it for a padlock.
>
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<div dir=3D"ltr">Another way to do this is rough grind the threads off on a=
 bench grinder and then finish on the lathe.=C2=A0 As long as you are caref=
ul no to go too deep on the grinder, it makes the lathe work a lot easier.<=
br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, =
Aug 9, 2016 at 9:20 AM, John Miller <span dir=3D"ltr">&lt;<a href=3D"mailto=
:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</span> wrot=
e:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex"><span class=3D"">On 8/8/2016 6:23 PM, =
Dave Cavanaugh wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Put another nut (or two) the the same size as the bolt head on the<br>
threaded portion, run it down to the bottom of the threads, align all<br>
the flat faces and put it in the chuck.<br>
</blockquote>
<br></span>
This worked for me as well.<br>
<br>
Done it a few times, but most notably I&#39;ve got a spare-tire mount on my=
 trailer that&#39;s got a 1in (I think) bolt thru a plate to retain the whe=
el, I cut the threads off the last inch and a quarter or so of the bolt, mi=
lled flats on the sides, and drilled it for a padlock.<br>
<br>
Cutting the threads off will require a fairly high speed and shallow cut.<s=
pan class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
John.</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
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