Thats how I was taught too, I usually use 1/2 turn in, 1 turn back.
You see a lot of guys on YouTube just cranking them down. I wonder how fast
they ruin taps and how often the break them.
-Curt
From: Dan Penoff via Mercedes <mercedes@okiebenz.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Cc: Dan Penoff <d...@penoff.com>
Sent: Monday, February 8, 2016 1:01 PM
Subject: Re: [MBZ] From bad to worse to nightmare
Isn't that how you're supposed to do it? That's how I was taught - one forward,
two back. Oil up or clear it out if full of chips.
Dan tap technique
Sent from my iPad
On Feb 8, 2016, at 12:38 PM, fmiser via Mercedes <mercedes@okiebenz.com> wrote:
> When using a tap - or a die - a technique that can help avoid
> breaking them is to turn backwards often to break off the
> chips created by the cutting. That can be as little cutting as:
>
> cut for 1/8 turn forward - 1/4 turn back to remove chips - repeat
>
> or as much cutting as:
>
> cut for 2 or 3 turns - 1/4 turn back to remove chips - repeat.
>
> Also, using a lubricate is a good idea. A respectable
> hardware store should carry thread cutting oil. Or mix lard
> 2:1 with kerosene or diesel for iron and steel. I don't
> remember what's a good choice for aluminum...
>
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