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Posted by Cheshire Steve on March 18, 2008, 8:28 pm
Please log in for more thread options On 18 Mar, 13:41, Austin Shackles
> On or around Tue, 18 Mar 2008 02:22:59 -0700 (PDT), Cheshire Steve
>
>
>
> >I would like to convert my tailstock lock from a nasty split clamp to
> >a normal locking system. I need to enlarge the clamp bolt hole and
> >centre the new hole on the edge of the existing one (approx).
>
> >The old hole will probably be entirely absorbed by the new one. The
> >new hole will of course have to break into the bore of the tailstock
> >spindle too. Could I bore the new hole with a slot drill, or maybe
> >start with a slot drill and then use a D-bit ?
>
> >Is there any general guidance on moving holes as I also have a lathe
> >bed and cast iron stand which are mismatched, with most bolt holes
> >from 10% to 90% of a diameter out (threaded in the stand). I have been
> >wondering the best way to get around that.
>
> >Any hints and tips ?
> >Steve
>
> How big is the hole?
>
> Slot drill has some merit if the hole's a fair size.
The existing tailstock clamp bolt is 1/4", so I expect the new hole to
have to be at least 1/2", maybe 5/8"- will measure up more accurately
tomorrow.
The holes in the lathe bed are bigger, and its a heavy lathe even
though only 3.5 inch, a Cromwell, not easy to get under the pillar
drill (until some B returns my engine hoist, and even then it will be
a challenge!). Maybe I can do with less bolting and use dowels for
location. While I have it I can guarantee the entire thing won't be
lifted by a sling around the bed, it can be lifted via the stand.
There can't be many forces on a lathe that try and bodily lift it from
the stand.
Steve
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> a normal locking system. I need to enlarge the clamp bolt hole and
> centre the new hole on the edge of the existing one (approx).
>
> The old hole will probably be entirely absorbed by the new one. The
> new hole will of course have to break into the bore of the tailstock
> spindle too. Could I bore the new hole with a slot drill, or maybe
> start with a slot drill and then use a D-bit ?
>
> Is there any general guidance on moving holes as I also have a lathe
> bed and cast iron stand which are mismatched, with most bolt holes
> from 10% to 90% of a diameter out (threaded in the stand). I have been
> wondering the best way to get around that.
>
> Any hints and tips ?
> Steve