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Drill bit question.

EVILDR235EVILDR235 Member Posts: 4,398 ✭✭
edited January 2017 in General Discussion
I was moving a tool box and found some drill bits i bought some time in the past. The bits are five inches long. They have a small tip and then down the shank the cutting flutes double in size. They appear to be some type of countersink drill bit. The only marks on the shank besides the size is the letters PTD, USA and HSS for high speed steel. On the end that fits in the chuck there is six dimples drilled around the shank. There is a very slight gold color to the bits. I found some similar ones on the net, but not the same. Help please.

EvilDr235
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Comments

  • montanajoemontanajoe Forums Admins, Member, Moderator Posts: 60,193 ******
    edited November -1
    Pocket Hole drill bit???


    https://www.kregtool.com/store/c26/pocket-hole-machinery/p322/foreman-pocket-hole-machine/
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  • montanajoemontanajoe Forums Admins, Member, Moderator Posts: 60,193 ******
    edited November -1
    or a 'step drill bit',,

    7145445-23.jpg
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  • AlpineAlpine Member Posts: 15,092 ✭✭✭✭
    edited November -1
    Step Drill.

    Different uses. Some made for Allen bolts (head clearance and Major diameter.
    ?The problem with socialism is that you eventually run out of other people's money.?
    Margaret Thatcher

    "There are three kinds of lies: lies, damned lies and statistics."
    Mark Twain
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  • EVILDR235EVILDR235 Member Posts: 4,398 ✭✭
    edited November -1
    I thought is was a countersink bit, but the dimples around the drive end had me wondering why they were there. The reduced area at the point is only about 3/8 of a inch long before the shank gets larger. All the picture i see here, the reduced area is much longer. Thank you all.

    EvilDr235
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  • montanajoemontanajoe Forums Admins, Member, Moderator Posts: 60,193 ******
    edited November -1
    Can you post a picture of what you got?
    Got me curious now too,,
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  • LesWVaLesWVa Member Posts: 10,490 ✭✭
    edited November -1
    Step drill bits or may be for drywall. Used for installing round type push in anchors.

    I have a 6 piece set that came with an anchor kit I bought. The point is for pericing the drywall to keep the bit from wondering.
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  • CaptFunCaptFun Member Posts: 16,678 ✭✭✭
    edited November -1
    Post a picture. Sounds like a pocket hole bit. (love them and my Kreg gig set) I have a set of tapered bits that don't have that step. They just gradually increase , but I bought them special for a canoe gunwale repair....
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  • EVILDR235EVILDR235 Member Posts: 4,398 ✭✭
    edited November -1
    Where do i find information here on posting pictures ? Me and my computer smart grand daughter were unable to find out how to do it.

    EvilDr235
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  • nononsensenononsense Member Posts: 10,928 ✭✭✭✭
    edited November -1
    EVILDR235,

    Here is the link found on Ask the Experts which I wrote several years ago:

    https://forums.GunBroker.com/topic.asp?TOPIC_ID=259294

    If you have any other questions just post or send me an e-mail:

    lr1000accuracy (at) gmail.com

    Replace the 'at' and no spaces.

    Best.
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  • AzAfshinAzAfshin Member Posts: 2,985 ✭✭
    edited November -1
    I have a set of bits that fit the description you give minus the dimples. I was told they were good for drilling sheet metal and such. They have a smaller tip to start the drilling and then the main shank is thicker to get the hole size you actually need. This way you don't have to use multiple bits to step up to the size you need.
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  • Mr. PerfectMr. Perfect Member, Moderator Posts: 66,438 ******
    edited November -1
    Like this?

    26150636ja_01_psd.jpg

    These are used for drilling dowel pin holes. The tip is a centering tip
    Some will die in hot pursuit
    And fiery auto crashes
    Some will die in hot pursuit
    While sifting through my ashes
    Some will fall in love with life
    And drink it from a fountain
    That is pouring like an avalanche
    Coming down the mountain
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  • Mr. PerfectMr. Perfect Member, Moderator Posts: 66,438 ******
    edited November -1
    The only other kind I can think of that would be 5 inches long and be at all like you describe is a wood boring bit, that has a centering tip:

    61DBk03ESML._SL1500_.jpg
    Some will die in hot pursuit
    And fiery auto crashes
    Some will die in hot pursuit
    While sifting through my ashes
    Some will fall in love with life
    And drink it from a fountain
    That is pouring like an avalanche
    Coming down the mountain
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  • iceracerxiceracerx Member Posts: 8,860 ✭✭✭
    edited November -1
    quote:Originally posted by Mr. Perfect
    Like this?

    26150636ja_01_psd.jpg

    These are used for drilling dowel pin holes. The tip is a centering tip


    Those bits, sir, are called 'Brad Point Drill Bits' and are used for drilling holes in wood.
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  • wiplashwiplash Member Posts: 7,145 ✭✭
    edited November -1
    Or like this?

    drill%20bit_zpsldjebho4.jpg
    There is no such thing as Liberal Men, only Liberal Women with Penises.'
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  • AlpineAlpine Member Posts: 15,092 ✭✭✭✭
    edited November -1
    quote:Originally posted by Mr. Perfect
    The only other kind I can think of that would be 5 inches long and be at all like you describe is a wood boring bit, that has a centering tip:

    61DBk03ESML._SL1500_.jpg


    That is a Bell Hangers Bit.
    ?The problem with socialism is that you eventually run out of other people's money.?
    Margaret Thatcher

    "There are three kinds of lies: lies, damned lies and statistics."
    Mark Twain
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  • AlpineAlpine Member Posts: 15,092 ✭✭✭✭
    edited November -1
    quote:Originally posted by wiplash
    Or like this?

    drill%20bit_zpsldjebho4.jpg


    That is a step drill. Many variations on the theme for various purposes. Blind fasteners (Cory), Kreg fixtures use step drills.
    ?The problem with socialism is that you eventually run out of other people's money.?
    Margaret Thatcher

    "There are three kinds of lies: lies, damned lies and statistics."
    Mark Twain
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  • EVILDR235EVILDR235 Member Posts: 4,398 ✭✭
    edited November -1
    Alpine and wiplash that is the one. I use to work with a guy that once worked for Boeing Aircraft. I may have gotten the bits from him along with several hundred new aircraft related nuts and bolts.

    EvilDr235
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  • merlinnmerlinn Member Posts: 1,549 ✭✭✭✭✭
    edited November -1
    quote:Originally posted by EVILDR235
    Alpine that is the one.

    EvilDr235


    Yes, step drill. The holes on the end are for a quick-change chuck
    and are used in the aircraft building business.
    I have lots of them. Used to get them at Boeing Surplus store in Kent WA..
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