Re: [Emc-users] Chinese collet chucks [Was: Re: Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread Gene Heskett
On Saturday 13 January 2018 23:56:21 Erik Christiansen wrote: > On 13.01.18 19:59, Gene Heskett wrote: > > I did get the mt5-5c adapter running pretty true, about half a thou > > of runout in the bore of an ER-40 adapter plugged into it, but the > > nut on the ER-40 is absolute trash. You can see

[Emc-users] Chinese collet chucks [Was: Re: Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread Erik Christiansen
On 13.01.18 19:59, Gene Heskett wrote: > I did get the mt5-5c adapter running pretty true, about half a thou of > runout in the bore of an ER-40 adapter plugged into it, but the nut on > the ER-40 is absolute trash. You can see it wobbling, and it pulls the > nose of a collet sideways so bad

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread Gene Heskett
On Saturday 13 January 2018 18:47:46 andy pugh wrote: > On 14 January 2018 at 00:27, wrote: > > But, as can be seen in the image below, the various retraction paths > > (in blue) are not along a single driveline. Why is that? > > I believe that this is to that every pass is the

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread Gene Heskett
On Saturday 13 January 2018 17:27:39 tom-...@bgp.nu wrote: > Another question related to threading…. It is my understanding that > when cutting internal threads (or external threads) that after a > threading pass the tool should return to the driveline (“I”) in order > to retract for the next

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread Gene Heskett
On Saturday 13 January 2018 13:17:19 tom-...@bgp.nu wrote: > Gene, > > > On Jan 13, 2018, at 8:18 AM, Gene Heskett > > wrote: > > > > This is confusing Tom. From the video I'd assume the enco is a slant > > bed machine. So this s/b equ to a regular lathe, with the z axis >

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread andy pugh
On 14 January 2018 at 00:27, wrote: > But, as can be seen in the image below, the various retraction paths (in > blue) are not along a single driveline. Why is that? I believe that this is to that every pass is the same shape, so ensure that everything is the same. I am not

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread tom-emc
Another question related to threading…. It is my understanding that when cutting internal threads (or external threads) that after a threading pass the tool should return to the driveline (“I”) in order to retract for the next pass. But, as can be seen in the image below, the various

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread tom-emc
Gene, > On Jan 13, 2018, at 8:18 AM, Gene Heskett wrote: >> > This is confusing Tom. From the video I'd assume the enco is a slant bed > machine. So this s/b equ to a regular lathe, with the z axis rotated > some arbitrary, might not be 90 degrees CCW as viewed from the

Re: [Emc-users] Internal threading using external G76 tool path (back-tool lathe)

2018-01-13 Thread Gene Heskett
On Saturday 13 January 2018 00:25:26 Tom Easterday wrote: > We have been successfully using G76 for external threading on our > EmcoTurn 120P lathe for some time. We haven’t yet used it for internal > boring or threading. We have an application to make some internal Acme > threads in a cylinder.