Sorry. That’s how I felt when I first heard of a HAL pin ;) Catheads usually have four fine thread set screws and act like a for jaw independent chuck so you can fine adjust the bores on barrels. By making one, you can gain some flexibility. By sticking a DTI probe inside of the bore, you can measure off the bore or grooves in a barrel and adjust both ends of the barrel to run concentric with the spindle. They can also be used in facing off a receiver shoulder after using a mandrel to bring the centerline concentric.
https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&u act=8&ved=0ahUKEwi6-4_clY_VAhUCYyYKHT0VAPYQjRwIBw&url=https%3A%2F%2Fwww.pin terest.com%2Fpin%2F294845106839231856%2F&psig=AFQjCNFuUssISJFvtHEqrvLf2d5sZ eC-GQ&ust=1500341478942344 Here is an outboard cathead: http://img.photobucket.com/albums/v654/300sniper/rifle%20tools/barrelthread 2.jpg This one is good for pistol barrels and short stuff like bolts: http://i628.photobucket.com/albums/uu2/strikerdown/Finished.jpg Marshall On 7/16/17, 7:57 PM, "Stuart Stevenson" <[email protected]> wrote: >Agreed - what is a cat head? > > >On Sun, Jul 16, 2017 at 7:11 PM, Gene Heskett <[email protected]> >wrote: > >> On Sunday 16 July 2017 19:13:42 Trent Hejazi wrote: >> >> > That¹s another direction I want to try. Basically, a cat head riding >> > in a ball bearing that mounts in the steady rest. >> >> Not familiar with the term "cat head", 'splain plz. Preferably with a >> link to a pix? >> >> > This would allow me >> > to center a barrel by using the DTI inside a chamber or muzzle, where >> > I cannot otherwise take a skim cut while supporting on a center or run >> > it through the headstock. Should save some time and frustration. >> > >> > Marshall >> > >> > On 7/16/17, 6:00 PM, "Chris Albertson" <[email protected]> >> wrote: >> > >Why not ball bearings? Then there is no relative movement between >> > > the rest >> > >and the part. >> > > >> > >As for friction of solid fingers >> > >lowest friction is a lead/copper alloy, next best phosphor bronze. >> > > Motor oil helps. >> > > >> > >On Sat, Jul 15, 2017 at 7:00 PM, Trent Hejazi <[email protected]> >> wrote: >> > >> I have brass contact fingers and they work well. When supporting >> > >> the barrel tennon, they ride on the threads without damaging them. >> > >> Otherwise, >> > >> they will always leave an annoying ring on a barrel. Only way to >> > >> circumvent is to make a collar to slip over barrel, then skim cut >> > >> concentric with the bore. Other option is to make a set of inboard >> > >> and outboard cat-heads so you can work near the head stock. This >> > >> really depends on the spindle bore dia and barrel dimensions you >> > >> are working with. >> > >> >> > >> Marshall >> > >> >> > >> On 7/15/17, 8:46 PM, "Gene Heskett" <[email protected]> wrote: >> > >> >Greetings all; >> > >> > >> > >> >My steady rest has steel sliders, which will not do for working on >> > >> >finished parts. So I need to order a foot of 1/2x1" brass or >> > >> > copper to make some more better shoes. >> > >> > >> > >> >Which will do the least damage to a pre-finished part, such as the >> > >> >> > >>fairly >> > >> >> > >> >high polished SS barrel? Brass or copper? >> > >> > >> > >> >Thanks everybody. >> > >> > >> > >> >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 >> > >> >[email protected] >> > >> >https://lists.sourceforge.net/lists/listinfo/emc-users >> > >> >> > >> ------------------------------------------------------------ >> > >> ------------------ >> > >> 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 >> > >> [email protected] >> > >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > >> > >-- >> > > >> > >Chris Albertson >> > >Redondo Beach, California >> > >--------------------------------------------------------------------- >> > >----- ---- >> > >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 >> > >[email protected] >> > >https://lists.sourceforge.net/lists/listinfo/emc-users >> > >> > ---------------------------------------------------------------------- >> >-------- 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 >> > [email protected] >> > https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> 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 >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > >-- >Addressee is the intended audience. >If you are not the addressee then my consent is not given for you to read >this email furthermore it is my wish you would close this without saving >or >reading, and cease and desist from saving or opening my private >correspondence. >Thank you for honoring my wish. >-------------------------------------------------------------------------- >---- >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 >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
