Yes.. works realy good..
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Drilling through 2” of steel
- Thread starter Talber8
- Start date
I was actually thinking that since this would really be pushing the limit on my Drill press that I had doubt it could do this accurately, and would inevitably give me some extra clearance... Maybe I'll work up to 1/2 and measure it, and go from there.
it’s an old Delta Model 15.
I already have the bits in reduced shank so will try this method; and no, the solid extension is way overkill but the price was right (gift)
Thanks!
- Joined
- Jun 7, 2013
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- 10,089
Best practice in drilling is to limit the size of the pilot drill to the thickness of the web of the larger drill, this prevents wobbling of the larger drill and consequent out of round hole.
- Joined
- Sep 29, 2017
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I second this method.
- Joined
- Jan 2, 2014
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a couple more pieces of advice......
1) Hold the part very securely!
lots of good ways:
-in a vise bolted to the table
-clamped down to the drill-press table
-if the part is long enough, put the "tail" of it against the left side of the drill-press column so it cannot be swung around
2) Beware of the drill bit grabbing the work, especially on "break thru" on the backside.
3) Wood under it will prevent the "arc of shame" found on so many drill-presses(example from web below).
...and Welcome to the Hobby-Machinist!
-brino
1) Hold the part very securely!
lots of good ways:
-in a vise bolted to the table
-clamped down to the drill-press table
-if the part is long enough, put the "tail" of it against the left side of the drill-press column so it cannot be swung around
2) Beware of the drill bit grabbing the work, especially on "break thru" on the backside.
3) Wood under it will prevent the "arc of shame" found on so many drill-presses(example from web below).
...and Welcome to the Hobby-Machinist!
-brino
- Joined
- Feb 2, 2017
- Messages
- 1,234
Or Travers is having a one-day sale...
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Perfect Metal Hole Making with R401 Commando Portable Magnetic Drill Press. Powerbor R401 Commando magnetic drill press is a portable hole-making system that comes with a 1145-watt variable speed motor. This drill press unit offers a 7/16 to 2-37/64-inch hole capacity and a 3/4-inch shank, and...
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$638 with the code word DEAL at check out. It's normally $788.
- Joined
- Feb 1, 2015
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- 9,609
The drilling strategy depends a lot on the amount of power your drill press has. Ideally you would drill with the 5/8" drill but that requires a fair amount of torque. With a 1 hp press turning at 650 rpm, you may be challenging the press to drill in a single pass. A pilot hole will greastly reduce the amount of down force and torque required.required. A 3/16" to 1/4" pilot hole should suffice. From there, I would go to the 5/8" drill. If you are having trouble pushing it through, you can go to aqnd intermediate size. I would try to stay away from too small an increment as you are cutting with only a small part of the drill and it is more likely to grab. Reducing down force caqn cause rubbing and accelerated drill wear.
