Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-06 Thread Gene Heskett
On Friday 04 August 2017 12:48:31 Gene Heskett wrote: > On Friday 04 August 2017 09:45:14 Jon Elson wrote: > > On 08/03/2017 09:52 AM, Gene Heskett wrote: > > > On Thursday 03 August 2017 06:54:02 andy pugh wrote: > > >> You probably want CBN (or conventional abrasive) for HSS. Diamond > > >> is

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-04 Thread Gene Heskett
On Friday 04 August 2017 09:45:14 Jon Elson wrote: > On 08/03/2017 09:52 AM, Gene Heskett wrote: > > On Thursday 03 August 2017 06:54:02 andy pugh wrote: > >> You probably want CBN (or conventional abrasive) for HSS. Diamond > >> is Carbon. Carbon dissolves in steel. > > > > At room temps? > >

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-04 Thread Jon Elson
On 08/03/2017 09:52 AM, Gene Heskett wrote: On Thursday 03 August 2017 06:54:02 andy pugh wrote: You probably want CBN (or conventional abrasive) for HSS. Diamond is Carbon. Carbon dissolves in steel. At room temps? The local temperature where the diamond hits the metal is likely NOT to

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread Gene Heskett
On Thursday 03 August 2017 13:18:49 Chris Albertson wrote: > Of course diamond will dissolve in even stone cold steel. But at what > rate? I remember a chemistry teacher explaining have the walls of a > glass beaker would dissolve in water. So we set about to figure out > how long until a

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread Gene Heskett
On Thursday 03 August 2017 11:02:59 John Kasunich wrote: > It's not room temp when it is scraping across steel at a couple > thousand surface feet per minute. (Or even a couple hundred.) > This is nominally 235.5 sfm, wet with k2. No k2 smoke from the heat at all. The k2 is turning black, but

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread Chris Albertson
Of course diamond will dissolve in even stone cold steel. But at what rate? I remember a chemistry teacher explaining have the walls of a glass beaker would dissolve in water. So we set about to figure out how long until a glass of water would eat a hole in the glass and leak.It was a

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread John Kasunich
Maybe but it definitely will remove a thin layer of the diamond. and another, and another On Thu, Aug 3, 2017, at 11:55 AM, Stuart Stevenson wrote: > Would that create a thin layer of casehardening? > > On Thu, Aug 3, 2017 at 10:02 AM, John Kasunich > wrote:

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread Stuart Stevenson
Would that create a thin layer of casehardening? On Thu, Aug 3, 2017 at 10:02 AM, John Kasunich wrote: > It's not room temp when it is scraping across steel at a couple > thousand surface feet per minute. (Or even a couple hundred.) > > On Thu, Aug 3, 2017, at 10:52 AM,

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread John Kasunich
It's not room temp when it is scraping across steel at a couple thousand surface feet per minute. (Or even a couple hundred.) On Thu, Aug 3, 2017, at 10:52 AM, Gene Heskett wrote: > On Thursday 03 August 2017 06:54:02 andy pugh wrote: > > > On 3 August 2017 at 07:39, Gene Heskett

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread Gene Heskett
On Thursday 03 August 2017 06:54:02 andy pugh wrote: > On 3 August 2017 at 07:39, Gene Heskett wrote: > > Playing with that $12 diamond disk, it looks as if it will do a > > decent job of shaping HSS tooling given time enough to do it. > > You probably want CBN (or

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread andy pugh
On 3 August 2017 at 07:39, Gene Heskett wrote: > Playing with that $12 diamond disk, it looks as if it will do a decent > job of shaping HSS tooling given time enough to do it. You probably want CBN (or conventional abrasive) for HSS. Diamond is Carbon. Carbon dissolves in

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-03 Thread Gene Heskett
On Wednesday 02 August 2017 14:09:09 Gene Heskett wrote: > On Wednesday 02 August 2017 11:23:00 John Kasunich wrote: > > On Tue, Aug 1, 2017, at 10:34 PM, Gene Heskett wrote: > > > On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote: > > > > you can use a spiral point ("gun") tap to push > > > >

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-02 Thread Gene Heskett
On Wednesday 02 August 2017 11:23:00 John Kasunich wrote: > On Tue, Aug 1, 2017, at 10:34 PM, Gene Heskett wrote: > > On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote: > > > you can use a spiral point ("gun") tap to push > > > the swarf ahead of the tap and out of the bottom. > > > > I think

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-02 Thread John Kasunich
On Tue, Aug 1, 2017, at 10:34 PM, Gene Heskett wrote: > On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote: > > you can use a spiral point ("gun") tap to push > > the swarf ahead of the tap and out of the bottom. > > I think that would describe the tap I am using except the flutes and >

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-02 Thread Gene Heskett
2017 07:34 PM, Gene Heskett wrote: > > On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote: > >>> -Original Message- > >>> From: Gene Heskett [mailto:ghesk...@shentel.net] > >>> Sent: Tuesday, August 01, 2017 7:49 PM > >>> To: emc-users@lis

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread dave
:11 Ken Strauss wrote: -Original Message- From: Gene Heskett [mailto:ghesk...@shentel.net] Sent: Tuesday, August 01, 2017 7:49 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Question on Z backlash vs rigid tapping On Tuesday 01 August 2017 17:14:55 Ken Strauss wrote

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Gene Heskett
On Tuesday 01 August 2017 23:26:31 Ken Strauss wrote: > Have you considered using a larger tap drill? A lesser thread depth > makes a huge reduction in the required tapping torque without > significantly reducing the holding power. Some references >

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Ken Strauss
Have you considered using a larger tap drill? A lesser thread depth makes a huge reduction in the required tapping torque without significantly reducing the holding power. Some references (http://www.tapmatic.com/tapping_questions_torque_vs_thread_strength.ydev for example) show that a 50% thread

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Gene Heskett
On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote: > > -Original Message- > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > Sent: Tuesday, August 01, 2017 7:49 PM > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] Question

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Gene Heskett
On Tuesday 01 August 2017 17:19:55 andy pugh wrote: > On 1 August 2017 at 22:17, andy pugh wrote: > > (both have > > more than adequate power, though). > > (This is my milling spindle at the lowest speed and the VFD cranked > down, it doesn't lack for torque). > >

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Gene Heskett
On Tuesday 01 August 2017 17:17:39 andy pugh wrote: > On 1 August 2017 at 21:56, Gene Heskett wrote: > > I could take the filter out, but I'd have to reduce Pgain by at > > least 75% just to keep it from hammering the gears in the head from > > the perceived errors in the

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Ken Strauss
> -Original Message- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: Tuesday, August 01, 2017 7:49 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Question on Z backlash vs rigid tapping > > On Tuesday 01 August 2017 17:14

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Gene Heskett
ks Ken. > > -Original Message- > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > Sent: Tuesday, August 01, 2017 4:57 PM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] Question on Z backlash vs rigid tapping > > > > Greetings e

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread andy pugh
On 1 August 2017 at 22:17, andy pugh wrote: > (both have > more than adequate power, though). (This is my milling spindle at the lowest speed and the VFD cranked down, it doesn't lack for torque). https://www.youtube.com/watch?v=thtDRjgbxRE -- atp "A motorcycle is a

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread andy pugh
On 1 August 2017 at 21:56, Gene Heskett wrote: > I could take the filter out, but I'd have to reduce Pgain by at least 75% > just to keep it from hammering the gears in the head from the perceived > errors in the velocity signal caused by a 5% quadrature timing error >

Re: [Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Ken Strauss
ect: [Emc-users] Question on Z backlash vs rigid tapping > > Greetings everybody; > > One of the things I have noted recently was a correlation between the thread > fit, and a commercial bolt screwed into the hole, and I believe it has to do with > my use of a peck routine to do the

[Emc-users] Question on Z backlash vs rigid tapping

2017-08-01 Thread Gene Heskett
Greetings everybody; One of the things I have noted recently was a correlation between the thread fit, and a commercial bolt screwed into the hole, and I believe it has to do with my use of a peck routine to do the tapping, more pecks=sloppier fit. My spindle doesn't have enough power to