South wales coal level
- Thread starter Tuck
- Start date
Tuck
Member
Haven’t really got any experience in digging a collapse out, would you support the section of the roof before the collapse ??
That looks like a hard dig - calcite-cemented shale...
I suspect the bolt and washer would have been used on ring arching? Nice hand pick, if you want to clean rust off iron artefacts with an angle grinder can I suggest using a wire cup brush rather than a flap disc, as the wire brush won't cut into the metal. Alternatively, try chemical cleaning with something like Sodium Citrate solution?
I suspect the bolt and washer would have been used on ring arching? Nice hand pick, if you want to clean rust off iron artefacts with an angle grinder can I suggest using a wire cup brush rather than a flap disc, as the wire brush won't cut into the metal. Alternatively, try chemical cleaning with something like Sodium Citrate solution?
I recently had success with a brass wire drill attachment on a chisel that I then used electrolysis to remove the rust. Sealed in a bath of boiling paraffin wax
Well the person who breaks a section out will get wet feet then !
I personally don’t see a issue with getting wet
I was thinking more along the lines are there being a lot of pressure behind and not causing a tidal wave
could try to bore hole through & insert a pipe ?
For easy chemical rust removal, try Sodium Citrate solution - dissolve 100g Citric Acid crystals in 1 litre of water, add 66g Sodium Bicarbonate, and when the fizzing stops, add a few drops of washing up liquid. Get as much loose rust as you can off the artefact with a wire brush, then put it in the solution for 1-2 hours, depending on the thickness of the rust this may need repeating in a fresh batch of solution . Rinse and dry thoroughly on removal, then use either wax or oil to prevent re-rusting - I cleaned back to bare metal a pair of horseshoes from my wife's old riding pony that had been sat in a damp place for 10 years, so it does work.