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Thankee Sir! Will head down there tomorrow, I only have a little of that left in the homebrew supplies. Time to stock up for another batch anyway. Unfortunately too late in the year to lager another

Reaming it provides a smooth bore & ensures it's actually as big as it claims to be. Roy wrote:

The practical problem is controlling the feed of a large drill enlarging a hole; they tend to self feed at their spiral rate. It's easier to control a reamer's feed. Roy hole, a drill would do just as

wrote: Hi Vikki, Well, I didn't mention that when I sat my last chemistry exam I burnt all my lecture notes BEFORE the results came back. No way I was repeating that subject even if they did let me

Yup! That's the same sodium bisulphate as the pH down product for pools/spas. It's quicker than alum (any of the common variants) & easy to get. Roy wrote: the they productid=285&cat=0&page=1

Ian, Am no chemist but have used Sodium Bisulphate (meta too I think) for broken drills etc in gold, silver, and aluminium. For aluminium somewhat dilute nitric would be faster but much harder to

Found this at my local homebrew store: http://www.cellar-homebrew.com/store/product.php?productid=285&cat=0&page=1 Would that work? Convenient place to get to (something special in Seattle) and I do

G'day Jeff, Andy, et al. I'm not quite sure by your comments whether you have used Sodium Bisulphate to extract broken taps. If you have then that substantiates my assessment that it is the sulphate

Ian, For some more info to confuse the chemistry freaks... the jewellery pickle is labelled " Sodium Bisulfate". The PH down might be a 'sodium meta bisulfate' but it is reported to be a cleaner (and

G'day Andy, Perhaps you could do a few extra-curricular experiments. Drill a hole in pieces of aluminium and then drive steel screws into into each then. No need to thread the hole. Not quite the same

Thanks, Ian. My chemistry stopped with school "A-level" (the exams that qualify you for uni). We had opportunities for extra-curricular experiments making gun-cotton, benzedrine etc. Much more

Hi Jeff, What a neat idea. After the work's been buggered I can save the tap to present to the tool store as evidence! Yeah, Ian sorted me out on that. But I'm still not repeating CHEM- 101. <G> John

John, No, you want the acid PH down. Remember that alkaline stuff eats aluminium. Unless you really want to save the tap rather than the work ;-) Jeff * REPLY SEPARATOR * - Demand

G'day John. Had a few of those passes as well, Pure Mathematics if I recall, they didn't want to risk seeing me back. But I got through. I had to dig the chemistry text book out when I got involved in

Hi Ian, Oops, I misread Jeff's reference to "Ph down for swimming pools" as reducing acidity. Not quite right, eh? In fact, dead wrong. I have to confess to my Achilles heal here. I have an electrical

G'day Andrew I think it is the sulphate ions which do the damage to the iron. Both iron and aluminium are trivalent so this could help the reaction. Corrosion of the iron would be helped by it being

I've been following this thread with interest; it's been ages since I broke a tap in aluminium, so it's bound to be my turn again soon. I have been trying to find out what alum actually is. "True

Roy wrote..........A reamer takes less power to drive. For making the hole, a drill would do just as well, except a 13/16" drill bit requires more torque than the lathe can deliver.......... I'm not

Oh no John, No John, No John, No! G'day all, (had to include that!) Alkalinity increaser will raise the pH whereas Alum lowers the pH. You want a very ionic solution with a low pH which will attack

wrote: Hi Jeff, How about dentures? <G> More seriously, would I be correct in assuming this bag of Alkalinity Increaser I have in the corner would be the same stuff? John