I need to put a 3/8" hole straight through the center of a 3/4" hardened steel ball. Tried the Bridgeport - leveled the top, centered and started to drill, and only dented it. Any advice from the D-Web brain trust?
p m said:Why not to mill/sand off a flat facet on the ball first, before drilling a hole? You only need it to be less than a quarter-inch in diameter.
crown14 said:I think he did
Knewsom please dont say this is for some kind of a left coast prince albert.
chris snell said:Is this for that Little House on the Prairie iPad cash register that you're building?
robertf said:first, you should be running faster on carbide compared to HSS, not slower
second, you have not mentioned coolant. Use it
third, if you are doing production quantities, look in to a coating. TiAlN on carbide works wonders for me, like doubling the volume between regrinds while increasing the cutting speeds. Its 20 bucks or so per tool, probably hard to justify on a 3/8" drill, but it will make a huge difference in longevity.
I HATE PONIES said:Whatcha buildin?
It may be out there already.
http://www.grainger.com/Grainger/machining/ecatalog/N-big/Ntt-3~~~4+inch+ball?Ndr=textsearchesinbase%2Btrue&sst=subset
knewsom said:......LOL - "prariepunk". I like it. It's a new trend.