On 2/10/2017 9:01 PM, TJoseph Powderly wrote: >> The reason I am contemplating the small hole EDM process is three fold. >> First it is difficult to drill these tiny holes in stainless and the >> drill bits frequently break. Secondly the back side of the hole needs to >> be burr free but is difficult to get to with conventional tools. > scale again... 'burr free' > well edm produces a burr, its small a few thou to 10 thou depending on > energy at breakthru and the system ability to control position well > ( hammering thru with bang bang control has larger burr ) > to get almost no burr, use a sacrificial plate and burn thru the SS and > into the sacrifice
I will have to reconsider if it does not make a burr free hole without a backer. I was under the impression it did. I guess what I was reading was with a backer or a stack of parts. I am not sure if the client would consider a 10thou burr acceptable. This is a spherical part where we are drilling through the spherical shell into the hollow center. Some holes are off center again benefiting from the EDM process. We could possibly have fluid (water) in the core of the sphere would that help reduce the burr? Snip > sorry i gets carried away with edm stuff > tomp tjtr33 No reason to apologize. You have provided lots of good information here. Thanks a bunch, Jim ------------------------------------------------------------------------------ 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
