开云体育1) I am curious as to why you want to drill a hole through a scrap 486 microprocessor. ? 2) The substrate for the microprocessor is very likely some type of ceramic material, so it is expected to be very hard and brittle. ? 3) Carbide “printed circuit” drills are meant for drilling holes in glass-epoxy circuit boards, not the ICs themselves.? Glass-fiber reinforced epoxy is very abrasive and will quickly dull a steel drill bit.? And yes, carbide is very brittle and will snap if there is any radial pressure on them. ? 4)? If you really want to make a hole through a 486, I suggest that you use a diamond encrusted burr of the same type that dentists use to grind (not drill) through tooth enamel.? If you cannot find one, ask your dentist if he will give you one that is not completely used up.? ? ? Good luck, ? Jerry F. ? From: [email protected] [mailto:[email protected]] On Behalf Of Ryan H via groups.io
Sent: Saturday, March 22, 2025 12:32 PM To: [email protected] Subject: Re: [7x12MiniLathe] dril a scp 486 ? Yes, try the carbide PCB drills. They're sharp and hard and will cut stuff that just laughs at high speed steel or even cobalt drills. BUT they are fragile and will break if you look at them sideways. You want to use them in a well centered chuck if you're using them on your lathe or a drill press with the part fixed so it can't move. I've drilled down to 0.6mm with them on my lathe.? On Mar 22, 2025 at 2:41?PM -0400, Charles Kinzer <ckinzer@...>, wrote: There are "printed circuit board drills" that I believe are carbide. ? Amazon has inexpensive ones.? Professional industrial ones cost more.? The are all quite brittle and easy to break.? They are usually used in CNC machines with multiple heads doing multiple boards at one time. ? ? Charles E. "Chuck" Kinzer ? On Saturday, March 22, 2025 at 11:27:37 AM PDT, Jacques Savard via groups.io <jacquessavard@...> wrote: ? ? 399?/?5?000 ? Résultats de traductionRésultat de traductionI have some cpu 486 or pentium vintage version ? But impossible to drill a ho;e in the material Normal drill for Metll Nothing barely trace Probably epoxy Do you have an idea please |
