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| Dissolving broken taps |
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| AdeV:
--- Quote from: craynerd on July 30, 2010, 04:21:39 AM --- Anyway...AdeV - any more progress today???? --- End quote --- Not much to report at the moment, I'm afraid.... last time I prodded at it, there's still a chunk of tap in the hole. I may have to move on to plan C: Buy a small carbide drill, drill into the tap, then use an easy-out to try to extricate it. Or try to tap the tap with a left-handed tap, if one can buy such things... [google] I see you can, why did I ever doubt t'internet... hopefully as the inner tap starts to bite, it'll simply rotate the original tap (what's left of it) out of the hole. Then I can finish the job with the proper HSS taps I've bought... |
| andreas:
Well…I did it a lot of times but not on a tap, you weld on the broken stud/screw using stick welder very carefully till you make a welding buildup out of the hole. After you can weld there a nut and take everything out. Usually we use E312 16 electrodes. I hope this can help!!!! Andreas |
| Lew_Merrick_PE:
Guys, AdeV wrote, "Well, you _can_ buy it straight off eBay, 1ltr @ 70% for less than £25 delivered." That is what kicked my reactions into gear. One of my longtime friend's wife is an ER nurse. I had gone over to their house with a bottle of muriatic acid to help with some regrouting. She just about freaked (not seeing my air supply system) as she sees people brought in suffering from acid damage to their lungs from using muriatic acid with fair regularity. I agree that getting into that position qualifies as "dumb" if you have any idea what you are doing, but too many people do not know the dangers of things they can buy off the shelf. I was visiting Guy Lautard (I assume most of you are aware of him and his The Machinist's Bedside Reader series) a few years back. He had a small (plastic) bottle of concentrated nitric acid that he had wrapped in cotton balls and placed inside a larger glass jar on his shelf. The cotton balls had turned into gun cotton and all the steel within a couple of feet of his "storage location" had been etched to a nice medium brown by the fumes that escaped the jar. (A) Gun cotton (nitrocellulose) can be "highly entertaining" in the most unexpected ways; and (B) etching by acid fumes can reach into all sorts of areas where you do not want it to reach (hence my warnings against using it indoors). The storage container was located about four feet from the headstock of his lathe. The fact is that many of the things we do can be quite dangerous. So long as we are aware of the dangers and take appropriate precautions, there is nothing wrong with this. However, when I see "advice" accumulating calling for something like "70% nitric acid" coupled with "using it indoors," I think that a bit of, "Guys, think about this..." is not out of order. |
| Bernd:
Very nicely said Lew. Ok now guy's let's keep under control here. Bernd |
| raynerd:
:ddb: |
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