Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Gregg Eshelman
On 1/25/2016 6:28 AM, Peter Blodow wrote: > Erik, > better let's be it as it is with metric thread values. If you are > selling things over here containing non-DIN/ISO threads (and other > things), you will be liable for all damage that could occur with them in > ordinary use and you will have to

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Erik Christiansen
On 25.01.16 18:50, Gene Heskett wrote: > On Monday 25 January 2016 18:34:10 John Figie wrote: > > > Why not reference the Machineries Handbook? > > > I have a copy of #27. Its been less than Biblical to me. > > 1. Hard to find in the index. > > 2. Once you THINK you have found the proper

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread tom-emc
> On Jan 25, 2016, at 10:45 PM, Gregg Eshelman wrote: > So you either have to somehow get a finger on something to provide > enough drag to force the ratchet to do its job, or you're stuck > constantly swapping and flipping two different open end wrenches because > the

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Gene Heskett
On Monday 25 January 2016 22:45:18 Gregg Eshelman wrote: > On 1/25/2016 6:28 AM, Peter Blodow wrote: > > Erik, > > better let's be it as it is with metric thread values. If you are > > selling things over here containing non-DIN/ISO threads (and other > > things), you will be liable for all

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Peter Blodow
Erik, better let's be it as it is with metric thread values. If you are selling things over here containing non-DIN/ISO threads (and other things), you will be liable for all damage that could occur with them in ordinary use and you will have to prove that your threads are just as good as

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Erik Christiansen
On 25.01.16 14:28, Peter Blodow wrote: > I have run a machine shop with up to twenty workers for 36 years and I > never heard about percentage of engagement etc. Peter, On the 10.2mm hole for M12x1.75, given in the table you posted yesterday, engagement is 84% - very strong, but hard on taps.

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread John Figie
Why not reference the Machineries Handbook? https://www.google.com/search?q=diyhpl.us+%E2%80%BA+papers2+%E2%80%BA+27_Thread_09A=diyhpl.us+%E2%80%BA+papers2+%E2%80%BA+27_Thread_09A=chrome..69i57.1787j0j4=ms-android-att-us=chrome-mobile=UTF-8 On Jan 25, 2016 4:33 PM, "Peter Blodow"

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Peter Blodow
Erik, right tomorrow morning I'll copy another table (fine threads) for you, for today I have had sufficient wine for not attempting (I found a 30 year old bottle this afternoon in our rarely used basement room). In case you need the size still tonight: the formula: diameter minus pitch is

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread tom-emc
As is often the case with data in Machinery’s Handbook, the specific information one is trying to find is difficult to locate. After many minutes of scanning I found the tolerances of a class 6H internal metric thread M12 1.5 thread: Minor Diameter - Min:10.376 Max:10.676. So, this says that

Re: [Emc-users] Calculating thread engagement [Was: Rigid tapping speed advice]

2016-01-25 Thread Gene Heskett
On Monday 25 January 2016 18:34:10 John Figie wrote: > Why not reference the Machineries Handbook? > I have a copy of #27. Its been less than Biblical to me. 1. Hard to find in the index. 2. Once you THINK you have found the proper table, the column heading abbreviations are quite often so