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It's also a pain when you want to use a drill that doesn't come with shank sized same as a typical annular cutter. I needed to tap 5/8-11 on one project, so had to spend a couple of hours making a 3/4" OD adapter for a 17/32" tap drill. It took that long because I had to bore a sliding fit ID for the drill shank, mill and drill double flats on the adapter, grind double flats on the drill itself, then turn clamping buttons for the double flats as the setscrews in the mag drill arbor weren't long enough to reach the drill shank. And the result only works for one size of drill...When you need to drill smaller pieces with the mag it is a pain.
Hougen, and probably Jancy too have tap drill sizes, just need to order it, probably not stocked at weld supply house.It's also a pain when you want to use a drill that doesn't come with shank sized same as a typical annular cutter. I needed to tap 5/8-11 on one project, so had to spend a couple of hours making a 3/4" OD adapter for a 17/32" tap drill. It took that long because I had to bore a sliding fit ID for the drill shank, mill and drill double flats on the adapter, grind double flats on the drill itself, then turn clamping buttons for the double flats as the setscrews in the mag drill arbor weren't long enough to reach the drill shank. And the result only works for one size of drill...
I have a second hand mag drill and have found it very good for the jobs I bought it for, drilling holes in RSJs, box sections and steel plates that won't fit in the drill press or milling machine. I wouldn't bother using it for anything else.
However:-
I have discovered that Rotabroach cutters can be bloody useful in the milling machine. A 3/4" Weldon holder or 19mm ER collet gives the ability to cut large, accurate holes at very rapid rates with little load on the mill. I find that I'm buying more different sized cutters to use in the mill than I ever needed for the mag drill.
Hey Guy,
I’ve heard a lot of talk lately about mag drill in jigs replacing drill presses. I see points on both side but I am looking for some feedback from you guys! Jig pictures and ideas would be great also!
^ Just buy stub length aka screw machine drills, there ideal for it and if you use them in the mill because there short you won't need to spot drill most things.
What kind of place won't even set that on some waist high sawhorses ?Here is how I used a mag drill yesterday to drill 88 17/32" holes in 7 1/4" thick alum for a customer of mine. Had to tap 1" deep.
Hougen with drill chuck and stub length.
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