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Hi,

I was tapping 6mm in 1/2" steel. Drilled 5mm and used WD40 as it was
handy. Pretty hard going and I snapped the tap on the 2nd hole. Enough
stub to wind it out with the vice grips. I ordered some Tap Magic and
waited for the postie.

The 2nd & 3rd threads were a breeze. I could have turned the wrench
with my little pinkies. I'm not practised at tapping deep threads. The
1/2" steel had a prior life as an anvil on my bench so it was probably
pretty narly. Still, I'm astounded at this Tap Magic. Is that the
experience of others?

John

Whilst WD40 is quite good for tapping aluminium it is not as you have found much good for anything more.

For what it costs it is far better to buy a purpose made tapping oil or compound which makes cutting far easier and gives better finish and prolonged tooll life. As an experiment someday try cutting mild steel with a normal hacksaw bothe dry and with a proper lubdicant and you will see the difference. As well as being easier my blades last ast least twice as long.

Gerry
Leeds UK

From: "born4something" <ajs@...>
Reply-To: 7x12minilathe@...
To: 7x12minilathe@...
Subject: [7x12minilathe] Tapping Lube
Date: Tue, 20 Mar 2007 06:32:56 -0000

Hi,

I was tapping 6mm in 1/2" steel. Drilled 5mm and used WD40 as it was
handy. Pretty hard going and I snapped the tap on the 2nd hole. Enough
stub to wind it out with the vice grips. I ordered some Tap Magic and
waited for the postie.

The 2nd & 3rd threads were a breeze. I could have turned the wrench
with my little pinkies. I'm not practised at tapping deep threads. The
1/2" steel had a prior life as an anvil on my bench so it was probably
pretty narly. Still, I'm astounded at this Tap Magic. Is that the
experience of others?

John

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G'day John & Gerry.
Somehow I seem to have finished up using "Tap Magic" and find it
works well on MS. Like Gerry I use a WD40 generic equivalent on Ali.
I remember being taught that the cutting fluid for Ali was kerosine
(parafin in the UK). WD40 is like Kero so that's why I have used it.
The generic WD40 in spray cans is handy because it can blow out the
swarf from the hole.
In theory the tapping hole for a 6mm x 1.0 thread is (6-1)mm = 5(mm).
This can be a bit tight, you may be better of with 13/64 hole for
better clearance.

I have trouble with dies and have almost given up with them and
prefer using the lathe to cut threads instead.

One good turn deserves another.
Regards,
Ian

--- In 7x12minilathe@..., "gerry waclawiak"
<gerrywac@...> wrote:

Whilst WD40 is quite good for tapping aluminium it is not as you

have found

much good for anything more.

For what it costs it is far better to buy a purpose made tapping

oil or

compound which makes cutting far easier and gives better finish and
prolonged tooll life. As an experiment someday try cutting mild

steel with a

normal hacksaw bothe dry and with a proper lubdicant and you will

see the

difference. As well as being easier my blades last ast least twice

as long.

Gerry
Leeds UK

From: "born4something" <ajs@...>
Reply-To: 7x12minilathe@...
To: 7x12minilathe@...
Subject: [7x12minilathe] Tapping Lube
Date: Tue, 20 Mar 2007 06:32:56 -0000

Hi,

I was tapping 6mm in 1/2" steel. Drilled 5mm and used WD40 as it

was

handy. Pretty hard going and I snapped the tap on the 2nd hole. >

Thanks guys.

You confirm what I've found. I just couldn't believe the difference.
I too was taught to use kero on ali and soluble oil for machining
steel. That was high school in Oz in the late 1960's. Hence that
recent hunt for soluble oil. I must follow up on that some time...

John


--- In 7x12minilathe@..., "steam4ian" <fosterscons@...>
wrote:

G'day John & Gerry.
Somehow I seem to have finished up using "Tap Magic" and find it
works well on MS. Like Gerry I use a WD40 generic equivalent on

Ali.

I remember being taught that the cutting fluid for Ali was

kerosine

(parafin in the UK). WD40 is like Kero so that's why I have used

it.

The generic WD40 in spray cans is handy because it can blow out

the

swarf from the hole.
In theory the tapping hole for a 6mm x 1.0 thread is (6-1)mm = 5

(mm).

This can be a bit tight, you may be better of with 13/64 hole for
better clearance.

I have trouble with dies and have almost given up with them and
prefer using the lathe to cut threads instead.

One good turn deserves another.
Regards,
Ian

--- In 7x12minilathe@..., "gerry waclawiak"
<gerrywac@> wrote:

Whilst WD40 is quite good for tapping aluminium it is not as you

have found

much good for anything more.

For what it costs it is far better to buy a purpose made tapping

oil or

compound which makes cutting far easier and gives better finish

and

prolonged tooll life. As an experiment someday try cutting mild

steel with a

normal hacksaw bothe dry and with a proper lubdicant and you

will

see the

difference. As well as being easier my blades last ast least

twice

as long.

Gerry
Leeds UK

From: "born4something" <ajs@>
Reply-To: 7x12minilathe@...
To: 7x12minilathe@...
Subject: [7x12minilathe] Tapping Lube
Date: Tue, 20 Mar 2007 06:32:56 -0000

Hi,

I was tapping 6mm in 1/2" steel. Drilled 5mm and used WD40 as

it

was

handy. Pretty hard going and I snapped the tap on the 2nd hole.