Message-ID:

It's computer hardware, of course it's worth having <g> -- Espy on #Debian

tech / rec.crafts.metalworking / Re: Taping bronze?

Re: Taping bronze?

<175bcbbe6b8299c7$4$3048414$13d399db@news.newsgroupdirect.com>

https://www.novabbs.com/tech/article-flat.php?id=7572&group=rec.crafts.metalworking#7572

copy link Newsgroups: rec.crafts.metalworking

From: b6ac3ff2...@example.com (Nigel)
Newsgroups: rec.crafts.metalworking
Subject: Re: Taping bronze?
X-Poster: Hermes 2.0
References: <bms2ug$pp3$1@pyrite.mv.net>
In-Reply-To: <bms2ug$pp3$1@pyrite.mv.net>
Content-Transfer-Encoding: 8bit
Injection-Info: 6b4fc0d3e453ddd24dc657c7b551cb88;960f637cf807a53c5520cf67a69c387b
Content-Type: text/plain; charset="iso-8859-1"; format="flowed"
Lines: 6
Path: i2pn2.org!i2pn.org!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!peer03.iad!feed-me.highwinds-media.com!news.highwinds-media.com!feeder.usenetexpress.com!tr1.iad1.usenetexpress.com!news.newsgroupdirect.com!not-for-mail
Date: Thu, 04 May 2023 01:15:04 +0000
Nntp-Posting-Date: Thu, 04 May 2023 01:15:04 +0000
Organization: NewsgroupDirect
X-Complaints-To: abuse@newsgroupdirect.com
Message-Id: <175bcbbe6b8299c7$4$3048414$13d399db@news.newsgroupdirect.com>
X-Received-Bytes: 1631

by: Nigel - Thu, 4 May 2023 01:15 UTC

I had the same problem tapping a 3/8" x 10TPI x 1" long thread in phosphor bronze. The first broken tap I put down to heavy handedness - the second broke when being extra careful and I think it was impossible with the lead-in on the tap. So many teeth cutting created more torque than the tap could withstand however carefully done. The tap flutes are deeper at the front causing further weakness. I salvaged a stub tap from the remains of the broken one which utilized the strongest part of the tap and also had a much higher specific tooth load as fewer teeth were cutting. Going carefully after that did the job but, as there is little lead-in on the tap, the lead-in has to be created by tapering the hole which works fine.
Nigel

--
For full context, visit https://www.polytechforum.com/metalworking/taping-bronze-287116-.htm