Question 1

how long are those?

Accepted Answer

Thanks for your question. We just measured all the bits. 
Length of Dia. 6.5mm drill bit: 100mm
Length of Dia. 6mm drill bit: 92mm
Length of Dia. 5.5mm drill bit: 93mm
Length of Dia. 5mm drill bit: 86mm
Length of Dia. 4.8mm drill bit: 86mm
Length of Dia. 4.5mm drill bit: 79mm
Length of Dia. 4mm drill bit: 74mm
Length of Dia. 3.5mm drill bit: 69mm
Length of Dia. 3.2mm drill bit: 65mm
Length of Dia. 3mm drill bit: 62mm
Length of Dia. 2.5mm drill bit: 55mm
Length of Dia. 2mm drill bit: 48mm
Length of Dia. 1.5mm drill bit: 39mm

Question 2

I need to cut through 3/16" heat treated high carbon steel. Think these can handle it?

Accepted Answer

Carbide bits are suitable for heat treated high carbon steel and hardened steel.

Question 3

Can these drill through cheddar or provolone without breaking?

Accepted Answer

Keep the speed very low or you risk burning the medium. You can go as low as 1RMM or even less. Or just chuck up a pit and poke at 0RPM. It works surprisingly well! If you wish to minimize the likelihood of burning, use a full-fat cheese for extra lubrication. Avoid drilling Swiss cheese if possible. The Swiss have used a clever proprietary blind hole drilling process during the manufacturing of their cheese and those pre-drilled holes definitely cause the bit to wander off course if the cheese is subsequently drilled outside of the factory setting. I learned that the hard way. Getting back to your original question, if you drill perpendicular to the face and slowly, you should be ok. I haven't tried it any other way tho, to be honest. By the nature of your question, I presume you are in Wisconsin. Go Packers!

Question 4

Why do drill bits sometimes break when drilling?

Accepted Answer

1. Poor quality of bit. 
2. Too much pressure on the drill and it either heats up and snaps or the point grabs and the bit twists and breaks. 
3. Not going straight through and pushing sidewise on the bit.
If you believe that you operate properly but the the bits break, please contact us for a few replacement. 
You can always buy with confidence from Migiwata.

Hymnorq Metric 1mm to 10 mm Straight Shank M35 Grade Cobalt Steel Jobber Length Twist Drill Bits Set of 19pcs for Metals, Packed in Indexed Metal Case

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