Re: [Emc-users] A correction to Re: Rigid tapping speed advice

2016-01-23 Thread Peter Blodow
Erik, the drill sizes you are using are all 0.2 to 0.4 mm too large, especially with the small values M2 to M6 where it hurts the most. The resulting theads have got to be too loose, easy to overtighten. Don't use complicated formulas, especially not percent calculatations in public, as my

Re: [Emc-users] A correction to Re: Rigid tapping speed advice

2016-01-23 Thread Erik Christiansen
On 23.01.16 14:48, Peter Blodow wrote: > Erik, > the drill sizes you are using are all 0.2 to 0.4 mm too large, > especially with the small values M2 to M6 where it hurts the most. No, I don't think so. As the note beside the table states: With a nut length of 1.5 * diameter, 50% engagement is

Re: [Emc-users] A correction to Re: Rigid tapping speed advice

2016-01-23 Thread John Thornton
As a general rule of thumb you are correct but there are many exceptions to that rule like material and depth which might require a larger and normal hole to prevent tap breakage. On 1/23/2016 7:48 AM, Peter Blodow wrote: > Erik, > the drill sizes you are using are all 0.2 to 0.4 mm too large,

Re: [Emc-users] A correction to Re: Rigid tapping speed advice

2016-01-23 Thread Gene Heskett
On Saturday 23 January 2016 09:43:59 andy pugh wrote: > On 23 January 2016 at 14:25, Erik Christiansen wrote: > > The tap offers no such variability. > > ... Normally :-) > > https://www.kennametal.com/content/dam/kennametal/kennametal/common/AT

Re: [Emc-users] A correction to Re: Rigid tapping speed advice

2016-01-23 Thread andy pugh
On 23 January 2016 at 14:25, Erik Christiansen wrote: > The tap offers no such variability. ... Normally :-) https://www.kennametal.com/content/dam/kennametal/kennametal/common/ATI%20Metals/Landis/Catalogs-Literature/SolidAdjustable.pdf -- atp If you can't fix it, you