[modeleng] Re: Broken tap and sulphuric acid
- From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 23 Oct 2007 20:44:42 +0100
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.
Other related posts:
