[TheForge] Re: Welding cast iron

[IowaHarry]

Ron, I haven't cast anything but a line since high school. That would 
require a whole new side line to this hobby of making things really hot. 
I'll keep that open as an option. I'm leaning towards a complete 
replacement in steel. There must be threaded acme nuts of this size 
available somewhere.

Harry

Ron Childers wrote:
> You could cast a brass nut
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter Fels & Phoebe
> Palmer
> Sent: Monday, May 19, 2008 6:52 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Re: Welding cast iron
>
> Hi Harry;
> You are the same sort of sucker i am..putting more dollars into 
> repairing a POS than a good,new one would have cost in the first place.
> It's one of my areas of expertese.
> Having  braised, too late to arc with Ni rod.
> The faces to be  braised need to be ground to bright metal, degreased, 
> then ( using cast iron braising flux) and pre-wet ( buttered) with 
> braising rod. Jig them in place and do the fusing passes. cool slowly.
> Then apply the " look honey, "I gotta buy an adult vise....it's a POS....pf
>
> IowaHarry wrote:
>   
>> Hi Mike,
>>
>>    The nut is, as you said, the female threaded part the vise bolt pulls 
>> on. On this vise It was a casting that is rather "L" shaped with a bolt 
>> to hold it in place going into the base. There is also a nubbin in the 
>> base casting that the "L" would be up against on the side of the pull so 
>> not all of the load would be on the bolt. Yes, buying a new vise may be 
>> what I do but I still intend to fix this one. That will probably be the 
>> line I use with SWMBO. "Look honey, it's broke, I gotta buy a new one".
>>
>> Harry
>>
>> Mike Spencer wrote:
>>     
>>> IowaHarry wrote:
>>>
>>>  
>>>       
>>>> ...broken the vise nut in my chinese vise shaped object (bench vise).
>>>> [snip]
>>>> The crack was on the diagonal behind the nut proper so we cut the
>>>> nut away from the base completely and made a black steel base to
>>>> braze to.
>>>>     
>>>>         
>>> Is the nut -- the female threaded part -- integral with the body of
>>> the vise?
>>>
>>> I forget just exactly how my bench vise is, but IIRC, the nut floats.
>>> That is, it's a separate part and is held to the base loosely with a
>>> pin or bolt or the like.  If the nut is actually part of the base
>>> casting, a sort of mushroom affair that sticks up into the axial line
>>> of the screw inside the movable jaw, that sounds like a really weak
>>> design. And if you reattached it with a braze and didn't get perfect
>>> alignment, that would subject it to even more stress.
>>>
>>> If that's the case, you might look first at a higher quality, old
>>> bench vise to see how it's made and then try building some kind of
>>> affair that would float the nut.
>>>
>>> Or maybe I don't understand just what your arrangement is.
>>>
>>>
>>> - Mike
>>>       
>