Drill SLOW...that good advise for drilling any steel IMO and even more important on hardened steel. i put my press on the lowest speed when drilling metal. a carbide bit works great, the first time i used one i was amazed at the difference betwwn carbide and even the best steel bits
best of luck and remember go slow, trying to rush it will cause extra wear on the bit and can over heat the bit and the piece your drilling plus it will take you longer to complete compared to going slow. I hate to say this cheesey line but "slow and steady wins the race" is very true in this context
what diameter bit do you need? i might have an extra carbide bit you can have, i have bits that are used, after so much use the company replace them. its cheaper to replace them all on a set time table instead of waiting for them to wear out which would require work stopage to replace as well as a poorer finished product. they are better off paying more in tooling costs then having a product returned or worse having one fail because they used bits/endmills that were too worn to provide the tolerances they require
they still have a nice edge and have plenty of life left, some have tiny chips but they still work for everything ive tried them on,
