What metal drill bit for putting a Piranha on?

[Leejohn]

The dial calipers are reading dead nuts on .8949.

 

[k0ua]

Look some more at the calipers. Count the spaces and you will see the numbers indicate the line above them. When they are closed it is at 0. The number 1 is in the first space so it has to open to the line above the number 1
to be at .1.
I can not understand how you can not see what it reads, it is just a bit over.8. As you can see the last number you see is .8, then the caliper is open to just over the .8 mark. This makes it about .81 or less.
The dial has nothing to do with any thing as it is not zeroed. Count the spaces and you will see the what the numbers indicate.

I have decided to get into this caliper fight.. I know how to read them too, and I also know when I am looking at a caliper that is not even close to be zero'ed. I say the dimension is about .805 to .810 or so. The dial is obviously way way out of zero as evidenced by the angle the dial is at. By looking at the hash marks on the slide, you can see it is barely over the .8 has mark. Aint no way it is even close to .895.. So there you have it I have spoken and that should end this dial caliper fight:laughing:

James K0UA

 

[Leejohn]

The 0 on the dial face doesn't always have to be at 12 o clock. If a tooth got jumped just re 0 the dial, could be at 3 oclock or where ever as long as it gets reset to 0. Why do you think the face can be turned?

 

[Baby Grand]

I have decided to get into this caliper fight.. I know how to read them too, and I also know when I am looking at a caliper that is not even close to be zero'ed. I say the dimension is about .805 to .810 or so. The dial is obviously way way out of zero as evidenced by the angle the dial is at. By looking at the hash marks on the slide, you can see it is barely over the .8 has mark. Aint no way it is even close to .895.. So there you have it I have spoken and that should end this dial caliper fight:laughing:

James K0UA

Exactly.

 

[uglyboywith11fingers]

Exactly.

.8 give or take a curly one. IMO, looking at the dial is meaningful only if you are the one that zero'd it.

maybe the OP should have just forgot the pic and asked how best to drill thru 3/4" steel.

Pete

 

[RAYJAY]

MC MASTER CARR has them 5/8 drill bit with under cut

High-Speed-Steel 1/2" Diameter Reduced-Shank Drill Bit
5/8", 6" Overall Length, 2.1" Drill Depth
In stock
$23.59 Each

they also have them in tin coating
2905A18
Each

Also known as Silver and Deming bits, these have a 1/2" diameter shank that allows you to drill large holes using a tool or machine with a 1/2" or 3/4" chuck. The shank diameter is smaller than the drill bit size. Overall length is 6" and drilling depth is 2.1".

Slip-resistant shank bits have three flats to prevent the bit from slipping in the chuck, unless noted.

135ｰ Point Angle輸 split point keeps the bit centered without a pilot hole. Black-oxide high-speed steel bits are for use on steel, cast iron, brass, bronze, and plastic.
Drill Bit Size 5/8"
Additional Specifications Fractional Size, Black-Oxide High-Speed Steel?35ｰ Point Angle
Slip-Resistant Shank

 

[Shield Arc]

I use these when ever I can.

 

[BukitCase]

Shield, did you leave 'em ANYTHING to work with when you retired??!?

I've lost count of the reasons you've given us to either move next door to ya, or HATE ya... :laughing: Steve

(still tryin' to figger out how to get my 12-speed, mere mortal type drill press to run annular cutters, and where to find a co-signer so I kin actually BUY a few )

 

[Shield Arc]

Shield, did you leave 'em ANYTHING to work with when you retired??!?

I didn't work for a mom & pop construction company. The company I worked for is fairly good size. Depending on the size of the project, the small tools budget may be in the hundreds of thousands of dollars. Can you imagine all the small tools that were bought for a project like the first picture? When these projects are completed all the tools, and equipment is shipped back to the yard. The small tools warehouse is probably 80' x 200' with a complete machine shop in one end. The small tools manager was pretty good at selling off some of these tools at times. I got this tractor torch for $50.00!
General Construction Company


I search Craigs list three times a day for good deals, I got this mag drill for $250.00. Sometimes you can get good deals on annular cutters off ebay, or Google Product Search.

I don't know how you would adapt an annular cutter to work on a drill press. What I did for my mill was take a 3/4-inch R8 end mill adapter, cut about 3/8-inch off the end, then grind one of the stops off the end of the annular cutter. So far it has worked really well.

 

[ericher69]

My tractor dealer uses a magnetic drill press to drill holes like what you need- in seconds! It's pretty impressive.
Try a local machine shop.

+1 on the machine shop!

You may be surprised at the price they charge you!

May save a whole bunch of time and possible physical injury.

The right tool for the job...

I recently made a 1-3/8 hole in 1/2 plate and wore out one hole saw, had to buy another, had drill press issues. $$ and time ++... Machine shop $20 and time to drop off and pick up