IIRC there are taps made for machine tapping, I forget what they're called,
machine taps maybe. They look like a cross between a drill bit and a regular
tap, maybe they're called twist taps...
-Curt
From: Greg Fiorentino via Mercedes <mercedes@okiebenz.com>
To: 'Mercedes Discussion List' <mercedes@okiebenz.com>
Cc: Greg Fiorentino <greg.fiorent...@comcast.net>
Sent: Monday, February 8, 2016 4:48 PM
Subject: Re: [MBZ] From bad to worse to nightmare -- tapping
I have done it on a lathe. The same would work fine on a mill, but I would
not use power. Either lathe or mill is good for alignment, using a
spring-loaded adapter to encourage the tap forward.
Also, I have read that gunsmiths in particular, might prefer to use carbon
steel taps instead of high speed steel. The point is that if they break off
they can be broken out by hitting with a hammer and punch since they tend to
be more brittle. I have not verified this myself. I've been careful (and
lucky!) not having broken off a tap as yet.
I have tried the alum solution to dissolve a screw. I was unsuccessful with
this as it was likely a stainless alloy which did not dissolve.
I think that any tapping fluid would work ok for aluminum (Al). I have read
that WD-40 is a good cutting fluid for Al, I just use my regular all-purpose
cutting fluids for cutting or tapping in Al. No problems or issues.
Greg
-----Original Message-----
From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rich
Thomas via Mercedes
Sent: Monday, February 08, 2016 1:23 PM
To: mercedes@okiebenz.com
Cc: Rich Thomas
Subject: Re: [MBZ] From bad to worse to nightmare -- tapping
I have looked at these little milling machines, some of them say they
will do tapping and have some sort of tapping speed or something. It
looks like they just go at it like a drill bit, though slower, and I've
wondered how those things can not break taps off doing it that way.
Anyone ever done tapping on a milling machine?
--R
On 2/8/16 2:29 PM, fmiser via Mercedes wrote:
>>> fmiser 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.
>> Dan wrote:
>>
>> 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.
> Just because some of us know that doesn't mean everyone one
> the list or anyone reading the archive will know. This
> seemed to be a good opportunity to mention the process.
>
> I have no knowledge of how Kaleb was using the tap, and taps
> will break even when used correctly. But maybe a few words
> here will save someone else the frustration Kaleb is dealing
> with right now.
>
> _______________________________________
> http://www.okiebenz.com
>
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>
>
_______________________________________
http://www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
http://www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
http://www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
