[TheForge] Jet tailstock disassembly?

[Jerry Frost]

Hardened or not it's not that difficult to remove provided the femail 
threads arent' too buggered and the bolt end isn't too buggered. just 
chuck it in the drill press and use a smaller carbide left handed drill 
bit. It'll bite the broken bolt and turn it right out. A cobalt bit 
might do it but if it chatters in the hole and buggers the threaded hole 
it changes the game.

We did this whenever possible, just drill for an easy out but use a left 
handed bit, it it works put the easy out back in the drawer if it 
doesn't use the easy out. It's a non-problem. Seriously, even if the 
drill press doesn't have a reverse just cross the belt and it'll turn 
backwards. Even if you have to put a little piece of HMWV plastic 
between the belt halves where they want to rub, thin plastic cutting 
boards are cheap, really cheap.

This isn't even thinking outside of the box, then again Father had a 
really large box to think in and I learned a lot in his thought box. 
Just don't over think things, a person can imagine insurmountable 
problems where none exist.

Jer


On 7/4/2013 5:24 AM, Paul Sperbeck wrote:
> If the broken set screw is hardened, it will be a problem drilling it
> out. I don't know what size it is but perhaps you can drill around it
> with a small hole saw, then clean up the hole and tap it for a larger
> size that you can then drill out for a more appropriate set screw.
>
> I have used pipe taps in holes like this and then just turned a solid
> plug to pipe OD then threaded it, when these are screwed in the tapered
> thread prevents it from going to deep and the addition of a little
> loctite will keep it there for longer than the lathe will last. You can
> also drill it for the smaller set screw while it is in the lathe.
>
> If the set screw is used to  guide the ram as I thought you described
> it, consider using a half dog set screw as a replacement.
>
> see:
> http://www.fastenal.com/web/products/details/26085?searchMode=productSearch&rfqXref=&rfqKeyword=&rfqId=&rfqLineId=&zipcode=&filterByStore=
>
> paul
>
> On 07/04/2013 07:34 AM, Andrew Vida wrote:
>> As I suspected, the set screw was broken.  Probably a bad unit, failed
>> when assembler over-tightened, and there we are.  I've not removed it
>> yet.  Need to figure how to fix it to the mill... or just try to drill
>> it by hand, though that option is not my first choice.
>>