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| Divided he ad:
--- Quote ---You, sir, have balls the size of church bells! --- End quote --- But hopefully not the shape! :lol: How goes the dissolving of the taps Ade? Ralph. |
| AdeV:
OK, a brief update: Nothing new so far :( For whatever reason, the taps are still there, obstinately enough. I don't know if it's lack of surface area that's caused the dissolving trick to fail, or quantity of steel vs. the quantity of acid I can get in there; maybe it needs some heat. So, I think it's time to dig them out mechanically. John (Bogs) suggested using a hole cutter to come down around the tap & remove it that way. Unfortunately, I don't have any suitable hole cutters, so I think I'll do something similar, but will mill a chunk away around the taps (enough to get something on them to remove them with. I'll then put a straight pin down to hold the plugs - or, plan C(2), a tapered pin (assisted into place with a large hammer), or Plan Q(4), a straight shank pin with a plug of some kind glued/screwed/otherwise held in place. It's high time I got back on with this project... so, watch this space... |
| stovebolt:
I couldn't find the size of your taps but if they aren't too big, you could make a hole cutter or annular cutters I think they're called, this is the only pic I could find, this was made specifically to locate springs , but it's the same principle. I just drilled/ reamed a piece of drill rod/silver steel and cut teeth in it with a dove tail, you also might want to cut some flutes. If you try it I would recommend you counter bore the ID to just a little short of the teeth so the plug doesn't friction weld and while using clear chips often. |
| AdeV:
Well, after FAR too long a hiatus, while waiting for the nitric acid to do something... anything... I gave up waiting & got back in the saddle... Clockwise from top left: 1 - Milled down to the broken off taps, lower & lower until I was pretty much underneath them 2 - Here we can almost make out the snapped off taps, sticking up. Not sticking up far enough to get the pliers on them, unfortunately 3 - After a while, I managed to pull out the remnants. Cleaned up the bottom of the hole (well, a bit anyway)... At this point, I was scratching my head wondering what to use as a dowel pin ( I still need to pin those plugs, remember)... Then, inspiration! I have several broken 6mm cutters (), so I ground a couple of broken ends down to length and... 4 - there they are, very gently battered into place with a hammer & punch. A nice tight fit... but not so tight as I'd worry about them coming out under the stress & vibration of the engine running at full chat - so, I shall make a block to go over the top, and that will be glued/screwed/loctited in place. Anyway, with the taps out, and the plugs pinned, there's no more excuses.... I can now proceed. Onwards! (erm, after Christmas probably...) |
| NickG:
Ade, Good to see you're back on track with this now though. I absolutely hate anything to do with cars at the moment due to all of mine being broken, but I'll still be watching! Just about to go and try some of the graphite you kindly sent for the stirling, the wife will be wondering what the hell happened to the bed sheets soon :lol: Nick |
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