On Saturday 21 November 2009, Jeshua Lacock wrote: >On Nov 21, 2009, at 9:55 AM, Gene Heskett wrote: >>> My first attempt was in olivine sand, and I had about 1/2 inch layer >>> of black quartz fused around the casting! >> >> I'll bet that was NOT fun to remove without damaging the casting too >> much. :( > >Lets just say I wrote that one off as an experiment. > >;) > :P
>> In graphite I'd think the cooling would be pretty slow, but the >> finish should >> show the machining marks in the graphite I'd think. With thought & >> carefull >> design, that mold should be re-usable several times too. > >You got it! > >One of the main reasons I have been building a CNC machine is for >making patterns and molds... Which generally, means a larger machine, but it can work in easier to cut materials too. I wish I had the time and space to build a gantry with a 2x4 foot vacuum bed & at least a foot of z, two A's and whatever the ability to swing it in both directions, the Z axis motions would be called. I hate hogging out the thumb holes in a gun stock by hand. First time, its fun. 2nd, a chore, 3rd and beyond tend to qualify for the PIMA description. ;) I'm contemplating a 4th pass since the 3rd one turned out to have been tried on an explosive piece of fawncy Maple. It was cooked, but it was far from dry & took several ounces of superglue to keep in in one piece, and has now had another decade for the other half of that plank to stabilize. The gun its holding, a TC Black Diamond 50 cal, has decided to shoot very well since I pitched the 209 primer carrying breech plug and put a #11 nipple in it. The 209's fire come hell or even high water, but are way too brutal and lift the rammed bullet clear of the packed powder before the powder can get a decent explosion going, and that lack of a solidly rammed load can make a decent gun shoot a shotgun pattern at shotgun ranges. With the #11 musket cap, its doing 2" to 3" groups at 50 yards, not great but will put venison in the freezer, and 3 feet smaller then the same load being lit by a 209 primer. I made a #11 carrying breech plug for my other coal burner, a TC Omega 50 cal with the factory thumb hole stock, but the firing pin is so well centered it goes right down the middle of the nipple, putting a very nice dent in the cap, but with nothing under the middle of the cap for an anvil, it doesn't fire. I hit the first one about 6 times without cracking it off. Gave up. With the 209's lighting it, it is not reliably on the paper at 50 yards. I hear they are making a puny powered 209 these days, but none of them seem to have filtered down to the gittin places of unwashed shooters of charcoal burners yet. Centerfire season opens here on Monday if you can't tell. I think I have a place to sit & let the dust settle on my eyeballs, till something wanders by. If I can keep my diabetic feet warm that is. :( Humm, not much left on topic in this here thread. ;) >Best, > >Jeshua Lacock >Founder/Programmer >3DTOPO Incorporated ><http://3DTOPO.com> >Phone: 208.462.4171 > -- Cheers Jeshua, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> "What the scientists have in their briefcases is terrifying." -- Nikita Khrushchev ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
