[PSUBS-MAILIST] boring tool

[hank pronk via Personal_Submersibles]

 Rick, I thought about a Mag drill, but I was thinking about taking my small milling machine apart and making a mount on the sphere.  A mag drill could be adapted easier because I could just tack weld a flat plate to the hull for it to sit on.   I have never used a mag drill and don't know how slow they can turn?  I figure I will have to turn something pretty slow.  Steve, I don't know if I can cut it out with a milling bit, I have very little experience with this idea.  I could cut it out small with a torch using a circle guide also.  I hate machining torch cut pieces because they tent to surface harden.  I suppose I could grind the hard surface off first.   I am looking for a easy clean way to do this, before I jump in and do it the hard way. My goal in to put two small ports in Elementary 3000 without welding them in.  I will machine two holes in the hull and then machine two conical port frames to fit the hull perfectly and will be retained from the inside of the hull. Any clever ideas to achieve this would be appreciated.Hank

    On Sunday, November 26, 2017, 11:16:30 PM MST, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi Hank,You could probably get away with using a holesaw - a one-piece one design for cutting metal, not the adjustable ones for cutting wood.  It would take a while and need lots of coolant and force, but I think it would be quite doable (I've seen big ones used on thick steel before).  The big ones aren't cheap though.
Or couldn't you just mill out the circle with a smaller milling bit, so that you end up with a disc that drops out when you finish the cut?
Cheers,Steve
On Mon, Nov 27, 2017 at 4:17 PM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank, Have you checked into a mag drill yet?Rick 
On Sun, Nov 26, 2017 at 1:49 PM hank pronk via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Hi All,Is there such a tool that can bore a 6 inch dia hole in 1 inch thick plate.  Some sort of milling machine tool, it needs to machine a precision hole.Hank______________________________ _________________
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