i need to drill 2 coolant holes in my cast iron block, i need to know how hard its going to be and if my snap-on air drill and snap-on bits will do the job.

 

yes it will. use plenty of lube (as in all life instances)

 

thanks

 

driling cast iron isnt easy, better not use no cheap ass bits, and like said above, lots of lube, i use pb blaster when drilling hard ass shit....works well cause oil seems to like to smoke up faster and it stinks, ha.....

 

These bits are bad ass for drilling cast. They are a little pricey though if your only gonna use them once.
http://www.hamprecision.com/body_proline_323.html

 

start with a pilot hole useing a small drill bit. then step up in size don't just go at it with a big bit... use old motor oil not wd40 also

 

Cast iron is easy, you just have to use the right drill speed and feed rate. And like Joey said, coolant/lube..

 

the holes i need to drill are very small, about 1/4" diameter if that

 

not to mention they really need to be used in a full flow press or a bridgeport. no reason to buy a bit that has coolant ports if you aint gonna use them right.

i am willing to bet that the strapon bits he has will do a good job. a standard HSS bit will do it, if you are good.