You're twisted...
From: Rich Thomas via Mercedes <mercedes@okiebenz.com>
To: mercedes@okiebenz.com
Cc: Rich Thomas <richthomas79td...@constructivity.net>
Sent: Monday, February 8, 2016 5:34 PM
Subject: Re: [MBZ] From bad to worse to nightmare -- tapping
The power of the Googs provides this pretty good thread (get it,
thread?)
http://bbs.homeshopmachinist.net/threads/33790-Power-tapping-holes-how-is-it-done
--R
On 2/8/16 4:58 PM, Curt Raymond via Mercedes wrote:
> 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.
>>
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>
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