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Spade drill holder

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  • jdedmon91
    replied
    On my lathe I’m not going really big in size. Probably the largest spade drill bit I was gifted will be as large as I can go. I may pick up an 1 1/2 spade bit if one comes around inexpensive enough. But with the power I have that would be all I’d be comfortable with.


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  • jdedmon91
    replied
    Originally posted by plunger View Post
    What kind of finish do you get off a spade drill.?
    Similar to a twist drill.


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  • plunger
    replied
    What kind of finish do you get off a spade drill.?

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  • Bented
    replied
    Spade drills are the way to go if you have the power.
    3" spade through 6 1/8" of annealed 4140 hr, took about 45 minutes, it got a bit steamy however.


    Part with the lathe work finished, it took 9 1/2 hours of drilling and setup to remove 75% of the material in a 15" CNC lathe (not nearly a large enough machine), the finished major diameter is 10 3/8", the bore is 5.625" +- .005", also 2 retaining ring grooves on the OD, .125" wide by .187" deep. It now goes into a mill where eight equally spaced 1.531" holes are drilled between the retaining ring grooves, to make it more fun the holes are angled at 5 Degrees in the X axis.

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  • jdedmon91
    replied
    I’m releasing the videos on the machining process of the drills and improvements to the process as I went along. Parts 1 and 2 will be the first drill. Part 3 is finishing the rest of the set of 4. Here is part 1
    https://youtu.be/POXeivAV1rY


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  • jdedmon91
    replied
    Originally posted by bob308 View Post
    we always made our own. no big deal. justmake shore the bit is centered on the shaft.
    Yes the project wasn’t that difficult, just not having a one to use as a guide was a challenge. I used a photo and machined one complete first. Then machining the last 3 as a group


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  • jdedmon91
    replied
    Originally posted by 754 View Post
    Maybe trim your brass hammer...
    I don't feel like retelling the story about the guy next door getting a piece lodged in his nutsack.. ..
    Actually the hammer isn’t mushroomed. This hammer was a coated one that the coating fell off of. I made up a Delrin handle for it, and it hasn’t been used that much. In fact I was stamping the sizes on the drill bodies


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  • bob308
    replied
    we always made our own. no big deal. justmake shore the bit is centered on the shaft.

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  • 754
    replied
    Maybe trim your brass hammer...
    I don't feel like retelling the story about the guy next door getting a piece lodged in his nutsack.. ..

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  • jdedmon91
    replied
    The finished product on its wall mount.


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  • jdedmon91
    replied
    Spade drill holder

    I’m working on the rest of the spade drills the other 3 are 90% complete. Still need to mill the reliefs and blue them with cold blue. There was 6 spades given to me. The two smaller ones are duplicates, so I will only have 4 drills made up. To make it easier for me I’m stamping the spade size on the drill body so I can ID it quickly.

    The first drill was a 1 3/64 drill and I did test it on a piece of steel that had a 1/2 drill hole in it. The spade drill performed like it was supposed to. If I do any more it will be to give me some options up to 1 1/2 inches. My lathe won’t be able to handle much larger drills than that.

    I’m working on the video for my channel however I thought I’d post an updated photo


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  • jdedmon91
    replied
    Originally posted by 754 View Post
    You are going to make more without trying this one to see how it works ?
    My lathe has 7 hp, and I can bog it with my bigger drills..
    I’ve already tried the first drill. It was an 1 3/64 spade. It was the largest. It worked ok. I’d be concerned if it was an 2 inch or larger.


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  • 754
    replied
    You are going to make more without trying this one to see how it works ?
    My lathe has 7 hp, and I can bog it with my bigger drills..

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  • jdedmon91
    replied
    I could do that, however I want the convenience of grabbing the drill size I want. So I’ll just machine up the set.


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  • 754
    replied
    Just make one with the slot for the thickest spade, the shim the rest.
    Making a holder for each is completely against the reason to use spade drills.

    You mY not eve like them, your machine may not willingly make use of them.
    So try one out. In steel..

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