How many flutes does the tap have? How deep is it inside the hole? Is it a Carbon Steel or HHS tap? Al Messer --- Ron Head <ron.head@xxxxxxxxxxxxx> wrote: > Hi Kevin > > You can always heat the casting to dull red and let > it cool slowly. This > will have the effect of annealing the tap, and it > can then be drilled out. > To prevent the drill wandering off into the phosphor > bronze, make a jig > plate and clamp this firmly over the hole. With > luck you will be able to > drill the core out, and the threads will just fall > away. > > The down side to this, of course, is the possibility > of distortion to the > casting. > > Regards > Ron > > ----- Original Message ----- > From: <kevin.osborn@xxxxxxxxxxxxxxx> > To: <modeleng@xxxxxxxxxxxxx> > Sent: Tuesday, October 23, 2007 11:24 AM > Subject: [modeleng] Broken tap and sulphuric acid > > > >I have broken the end of tap in a phosphor bronze > casting, and I have > > heard a rumour that a couple of drop of sulphuric > acid will dissolve the > > tap. Is this correct? And if so where can I buy / > get a small quantity. > > I have been offered 25 litres, but cannot get > anything smaller. > > MODEL ENGINEERING DISCUSSION LIST. > > > > To UNSUBSCRIBE from this list, send a blank email > to, > > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject > > line. > > > > > > -- > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.503 / Virus Database: 269.15.5/1085 - > Release Date: > > 22/10/2007 10:35 > > > > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject line. > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.