Thread: carbide drill

hi
will a carbide drill put a hole through a hardened and ground qctp body i need to open the existing hole up
if so do you go slow or fast
steve

I suspect a properly sharpened HSS drill bit would even do that. What size hole do you need? Is it to fit the post bolt?

Usually the harder the material, the slower you go. What size hole?

Simon

Can you hold the work in a four jaw and bore it out? you'll get a better finish

What size is the hole now and what size do you need? A drill may be the wrong choice for this job.

hi
yes it is for the hole in the tool post hss will not even look at it
steve

As suggested above, bore it out on the lathe or on a mill. Using a drill bit is not the right tool for the job.

Simon

hi
a hss drill bit wont touch it so why will putting it in the 4 jaw chuck and trying to bore it with hss work
steve

It probably wouldn't but you never know,
An indexable bar would probably be the better option.
How big is the bore at present?
Are you able to machine a new mounting stud to suit your tool post?

pipeclay
i think i will have to make a new stud i dont have any carbide or tip tooling and all i wanted to know was if a carbide drill would go through hardened steel
if it did i would have brought one
thanks steve

If the carbide drill is an option to you check the price of a boring bar as well as these days they can be found quite cheaply, sometimes they may even come with one or two inserts.

Need more information. It really depends on what equipment you have and how much you need to open up the hole and what equipment you have. Drilling a 12mm hole out 18mm in the machining center at work* no problems. Going from 12mm to 13mm in a drill press, not going to work.

*The drill for doing that would be about $200.

Would a carbide burr work if there's one a suitable size? I was thinking one with a cone shape may work.