Anyone know where I can find parts to my IH mill, so that I can drill 20mm (4/5 inch) holes? Need to find a big chuck and some big drill bits, if that is the best option for drilling 4/5" holes?
Hoping that someone can help me!
The simplest is what is known in the UK as a Blacksmiths drill bit. They are large diameter drill bits that have a shank with reduced diameter. Unfortunately I don't know the Norwegian name.
Have a look here for an example.
I think you will have to drill in steps to avoid slippage.
In the US those are known as Silver & Deming drills.
Seems like one of those items that is just so oblivious that would have been "invented" many times by many people.
Thanks allot guys!
These Blacksmiths and Silver & Deming drill bits looks like a very good option. But i probably have to drill atleast one hole first. So that will be a bit time consuming when a shall drilll many holes. But I quess I can`t drill the hole with a boring head directly? (the plate is 5mm thick).
Another option is to buy a R8 end mill holder, and a end mill that can bore horistonal. But this is kind of expensive beacuse I have to buy a R8 holder for each end mill dimension.
So what do you think guys? With option do you think are the best?
Luna is not an option, way to expensive
If I were you I would use a Hougen Rotabroach cutter (www.hougen.com). They would work good in that chineese iron of your's because they require very little horsepower and drilling thrust. They only cut out the perimeter of the hole and leave a slug that falls out. Your holes would be much more accurate than using a twist drill or end mill.
They have them in metric sizes too. There are many different knock-offs of these cutters nowadays so you shouldn't have difficulty locating one.
You don't need a drill bit on a CNC. Simply pocket cut the appropriate hole side.