Re: [CAD_CAM_EDM_DRO] Cast metal question

"Metal stitching" is figure of 8 shaped wedges with a sort of cam locking
fitted into jig drilled cavities, It would be expensive but it does
work(seen it on a broken casting for a tool changer)

Chris Paine
UK

----- Original Message -----
From: Multi-Volti Devices <multi-volti@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, August 30, 2001 6:30 AM
Subject: [CAD_CAM_EDM_DRO] Cast metal question


> Hello:
>
> I am working on an old machine that has two pieces broken off by a
> forklift in preparation to ship it.
>
> I assumed both were cast iron only to discover neither is
> magnetic...they are dark grey granular/crystalline-looking where break
> happens, no bending, just fracture.
>
> I'm told it can't be welded...someone suggested JB Weld (epoxy I
> assume), but I think the fracture will still be stressed with only a
> thin layer holding it. I want to glue (very thin epoxy or cyanoacrylate
> (because it's so thin, crystalline metal surfaces can still interlock -
> nto sure epoxy will allow that) it and then drill it to insert roll pins
> thru/across the fracture.
>
> Any suggestions?
>
> The second piece has me puzzled - it's a 'T' shape, inverted. The 'top '
> of the 'T' is actually the base, with two bolts holding it to the base
> of the machine. A counter mounted on this inverted T. The 'stem' of the
> tee was broken off.
>
> After removing the bolts, I still can't remove the remaining base
> (inverted 'top' of T"...block of wood and sledge hammer won't budge it,
> can't see a bolt underneath...I can't figure why they put two 1/4-20
> bolts thru it if it's so darn intimate with the base!