Strostkovy
Titanium
- Joined
- Oct 29, 2017
So it's probably my fault but I'm making an electric control retrofit for a Clemco sand blast pot (I did this at my old job except I used huge solenoid valves for the pressure and purge directly, but this pot came with brand new pilot activated valves so I'm only adding a small valve to control pilot air) and wanted to drill out the hole for the hinge bolt that the control paddle pivots on so I could use a larger bolt and tighten up the slop in the mechanism before adding a switch to it. In the process the bit grabbed badly and snapped off a portion of the ear around the bolt hole, totalling the casting. figured I would rivet on a washer plate and drilled the through bore on the paddle. Just the weight of the hand drill made it want to dig and bind. I ended up drilling at around 60 rpm and running the drill backwards to smooth the burr if it got caught.
Anyway, I can make a new part but is die cast zinc that atrociously brittle and crunchy? I could have sworn it was typically soft and machineable, but this felt like pot metal without the telltale grain structure. This was made sometime in the 60s I think. What alloys are typically used for die cast parts?
Anyway, I can make a new part but is die cast zinc that atrociously brittle and crunchy? I could have sworn it was typically soft and machineable, but this felt like pot metal without the telltale grain structure. This was made sometime in the 60s I think. What alloys are typically used for die cast parts?