Hi all, I just stumbled across this subreddit and hope you all will be able to help me out. I'm primarily a woodworker, but I have a project where I need to drill out four quarter of an inch holes into hardened steel. As I've never really worked with metal before I don't have any drill bits that are suited for it. Is there a type of bit or brand that would be recommended? Also at what speed should my drill press be set? I purchased some blue cutting fluid from home depot, but that's about it. Any advice would be much appriecated. Thanks!

Tap and Drill Size Chart ; 5/8-11 .5312, 17/32 ; 3/4-10 .6562, 21/32 ; 7/8-9 .7656, 49/64 ; 1″-8 .8750, 7/8.

Diamond Inserts. In general, diamond inserts is PCD Inserts.you can choose using pcd tools if the material of your workpieces is Aluminum, Aluminum Alloy,Copper ...

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HSS Single Flute TMX Countersink, 82° angle, 1/2" diameter x 1/4" shank diameter X 1" shank length x 2" overall length (OAL). Single flute provides smooth ...

Michigan Drill 401 21.00 General Purpose Taper Length Drill, 21 mm Drill - Metric, 0.8268 in Drill - Decimal Inch, 10 in OAL, HSS, Black Oxide.

Insert wear · Smeary material · Cutting speed too low · Intermittent machining with coolant · Coating too thick.

DRILLING WITH HIGH PRECISION · Speed helix design for three times faster drilling than standard bits · Last 50% longer than high-speed steel · Easier drilling, ...

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... SFM. Slower speeds should be used to mill harder materials like Steel, Cast Iron, Tool Steels and Nickel based alloys such as Stainless Steel and Inconel.

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