On Sunday 07 February 2021 15:08:59 [email protected] wrote: > -----Original Message----- > From: Gene Heskett <[email protected]> > Sent: February 7, 2021 2:46 PM > To: [email protected] > Subject: Re: [Emc-users] machine opinion please > > On Sunday 07 February 2021 13:09:24 Jon Elson wrote: > > On 02/07/2021 06:38 AM, Gene Heskett wrote: > > > 1. Any tool griping mechanism the has to squeeze a collet by > > > drawing it lengthwise in a tapered seat has to compromise your tlo > > > offsets in the tool table > > Perhaps using a collet results in more variability of tool lengths > compared to an R8 alone. However, I doubt that either way is > reproducible to less than several thou. Why not touch off to a tool > height sensor or use a simple system like the Tormach TTS? > I, if doing a multipart job, normally touch off to a piece pcb at the start of the program, or after any tool change and apply the offset found by the g38.2 to the co-ordinate system in use. All w/o any interaction with me.
To make those tap hats, I lined up the needed jigs on the table in a row, and when I had all those co-ords written into the program, it was a matter of "changing the tools" to redo that. So all I had to do was find the right sized drill, change the tool and/or move the workpiece from jig to jig. Feed it brass plugs precut in the Sheldon, and assemble that tap into the finished hat. I did about 75 of them IIRC. This included drilling the central hole for the tap shank and tapping 5 more holes for the 4 that fix the square butt of the tap, and the slightly recessed 4mm cap screw that locks it to the R8. It was drilling the tap shank hole all the way thru it that I became rather painfull aware that the post wasn't plumb to the table, so you would normally tram it to the table, but that leaves you dragging the side of the drill bit, creating all sorts of objectional screeching, or figure out which way it is off, and drilling the hole at the posts lean angle. So lets just call it a pain in the ass and be truthfull about it. The net result is that none of the tap hats pulls a tap absolutely dead straight. Loose taps. Take care and stay well, Ken. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
