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best bits for drilling through 1/2 inch steel beam?

This topic contains 75 replies, has 34 voices, and was last updated by  theamcguy 1 year, 4 months ago.

Viewing 20 posts - 21 through 40 (of 76 total)
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  • #259416

    slow and steady, with plenty of oil.

    Thanks for the info. I’ve always been running the bits fast. Just got a set of cobalts and I’ll slow it down and use oil in the future.

    #259608

    theamcguy
    Pro
    Fayetteville, NC

    slow and steady, with plenty of oil.

    Most guys use too high a speed when drilling and instead of drilling they burn the hole through even in wood. That smoke you see coming off your bit is not good, means the tip is overheated and losing its edge. In metal you need oil, WD-40 or something. It acts as much like a coolant as a lubricant.

    Automotive Pro
    Fayetteville, NC

    #259696

    slow and steady, with plenty of oil.

    Most guys use too high a speed when drilling and instead of drilling they burn the hole through even in wood. That smoke you see coming off your bit is not good, means the tip is overheated and losing its edge. In metal you need oil, WD-40 or something. It acts as much like a coolant as a lubricant.

    I was trying to drill some stainless. Not a thick piece but I burnt a bit. Actual tip turned black. Now I use oil but didn’t expect that to happen.

    #300420

    rylim
    Pro
    Missouri City, Texas

    Recently I on a project that I need to drill 7/32″ drill bit. Besides that, the drill bit has to be 12″ long as we need to drill it through floor sip.

    Could anyone give me a suggestion which drill bit should I get ?

    #300426

    theamcguy
    Pro
    Fayetteville, NC

    Recently I on a project that I need to drill 7/32″ drill bit. Besides that, the drill bit has to be 12″ long as we need to drill it through floor sip.

    Could anyone give me a suggestion which drill bit should I get ?

    The aircraft industry uses bits like that. Here is an example:

    http://drillsandcutters.com/7-32-x-12-hss-aircraft-extension-drill-bit-drill-america/?gclid=CjwKEAjw0LmoBRDHuo7UkaKXhn8SJADmDTG0-HBrFtGEuDDWGmdDE-MwiAKgpWL7cMFLz3zJqt7v_RoCpfbw_wcB

    Automotive Pro
    Fayetteville, NC

    #300435

    rylim
    Pro
    Missouri City, Texas

    Recently I on a project that I need to drill 7/32″ drill bit. Besides that, the drill bit has to be 12″ long as we need to drill it through floor sip.

    Could anyone give me a suggestion which drill bit should I get ?

    The aircraft industry uses bits like that. Here is an example:

    http://drillsandcutters.com/7-32-x-12-hss-aircraft-extension-drill-bit-drill-america/?gclid=CjwKEAjw0LmoBRDHuo7UkaKXhn8SJADmDTG0-HBrFtGEuDDWGmdDE-MwiAKgpWL7cMFLz3zJqt7v_RoCpfbw_wcB

    Thanks for the link. Actually I paid $10 for this drill bit and it only lasted me for 30 holes before it broke.

    I am looking for a drill bit that better than this one

    #300652

    kswiss
    Pro
    edmonton, AB

    I still love the norseman bits, very nice quality. I’m not sure if they make a 12 inch bit though

    #300702

    rylim
    Pro
    Missouri City, Texas

    @kswiss.

    I will give it a shot as they listed on catalog that 12 inches of drill bit is available

    #300721

    Sprokitz
    Pro
    Easton, Pa
    #300778

    kswiss
    Pro
    edmonton, AB

    That’s an awesome chart thanks for sharing

    #342466

    sergey061478
    Blocked

    cobalt drill bits, slow speed and cutting oil will do the trick

    #342524

    rylim
    Pro
    Missouri City, Texas

    @sprokitz Thanks for the useful chart

    #342551

    TonyG
    Pro
    Colorado Springs, CO

    I try to always use cutting oil I have a little tub of it that I keep in one of my tool boxes. It makes your bits last.

    #342570

    whitehill
    Pro
    Ottawa, ON

    Great chart! Printing one to go by the drill press and one to go in the toolbox.

    #342762

    DirtyWhiteBoy
    Pro
    Honolulu,, Hi.

    Thanks for the link. Actually I paid $10 for this drill bit and it only lasted me for 30 holes before it broke.

    The key here is as has been said,,, Slow and oily so the bit is cutting and not spinning and getting too hot. It’s the heat the dulls the tip. Once the tip is dull the bit heats up and snaps. I’m really good at snapping bits.

    Dirty

    A Working Pro since 1988!

    Member since January 26, 2013.

    #342772

    r-ice
    Pro
    Durham region, ON

    I prefer HSS bits, when they dull you just sharpen them up again. Also cutting fluid will help or if you can and this is with a drill press, make a pump for coolant.

    #343543

    sergey061478
    Blocked

    thanks for the chart! this is definitely a very helpful reference.

    #343773

    rylim
    Pro
    Missouri City, Texas

    Thanks for the link. Actually I paid $10 for this drill bit and it only lasted me for 30 holes before it broke.

    The key here is as has been said,,, Slow and oily so the bit is cutting and not spinning and getting too hot. It’s the heat the dulls the tip. Once the tip is dull the bit heats up and snaps. I’m really good at snapping bits.

    Any tips on sharpening the dull drill bit ?

    #343909

    theamcguy
    Pro
    Fayetteville, NC

    Any tips on sharpening the dull drill bit ?

    I use a Drill Doctor. I like it. I get a bunch of broken bits saved up, break out the Drill Doctor set it all up and go to town. It works. Not quite as easy as they make it seem but it gives you a nice accurate point.

    Automotive Pro
    Fayetteville, NC

    #343912

    kswiss
    Pro
    edmonton, AB

    Any tips on sharpening the dull drill bit ?

    I use a Drill Doctor. I like it. I get a bunch of broken bits saved up, break out the Drill Doctor set it all up and go to town. It works. Not quite as easy as they make it seem but it gives you a nice accurate point.

    Do you sharpen to 135?

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