Perhaps I completely misinterpret your sketch but... What is wrong with inserting the R8 collet into an ER40 collet block (available from ArcEuro and I'm certain other suppliers)? Clamp the collet block in your vise and do the deed. The reduced diameter part of a R8 collet is about 15/16 and the accurate portion is supposed to be 0.9495 so it should pass through a 15/16 ER collet.
Alternatively, since I don't think that great accuracy is required, secure the R8 in a V-block using a strap clamp. > -----Original Message----- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: Sunday, April 01, 2018 2:37 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] R8 holder jig? > > On Sunday 01 April 2018 11:15:39 Andy Pugh wrote: > > > > On 1 Apr 2018, at 16:01, Gene Heskett <ghesk...@shentel.net> wrote: > > > > > > But the thought has come to mind that for series production, I also > > > need a jig to hold these R8's when they arrive in order to cut the > > > slot in one leaf of 3 leaf design, to make that cut in the lip for > > > the keying screw. I see a lot of similar gizmo's for 5C tooling, > > > but haven't tripped over one made to do the same thing to an R8. > > > > The 5C ones are for holding a workpiece in a 5C collet, not for > > holding a 5C collet. With both collet types you would need to grip > > something in the collet in order to clamp up tight. > > > > R8 is meant for cutter holding. What would be the application of an R8 > > Spin indexing fixture? > > > Apparently my description has not been adequate to describe what I want, > which is keying the tap holder slug into the R8 so that it cannot rotate within > the keyless bore of an R8 tool holder. The half circle, or a little over a half > circle, as pointed out in the attached scribble, is where I want to cut away so > as to allow the head of a 4mm socket head screw to enter into the cutaway > shown in the end of the R8 so as to key the "tap hat" slug to the R8, already > keyed to the spindle by its pin and locking slot, removing yet another > potential point of slippage to screw up a hole while rigid tapping it. > > Short of spending 6 months to learn how to run one of the cadcam gfx > engines and make a professional drawing, its the best I can do on the back of > an envelope. My water bill TBE. :) > > -- > 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) > Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
