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Old 04-26-2020, 01:16 AM
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Default making a spade bit

I had a need to make a spade bit to cut holes into tree stumps to rid them on the place.

I happened along on this video, got a few ideas from it etc,

All was good until he got to the part of grinding the cutting faces, then it turned to crap. lol
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Old 04-26-2020, 02:57 AM
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Plunge cuts with a chainsaw?
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Old 04-26-2020, 08:23 AM
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It doesn't look too hard. The cutting edge,I mean! Did you notice the cutting center point fold up like a wet noodle under use?

It is about as tough as peanut paste! Perhaps think about using a chunk of old flat file as the cutter edge.Quench quickly after the weld and you should be ok. For what you are doing it should not need the full anneal and heat treat route. Maybe use a a Grd 8 bolt of around 3/8"for better compatibility

Then take a look at the marking out.The sharpee mark out was as rough as guts and then it was hacked out with the grinder. It made it out of balance and vibrated like buggery ,no wonder it cut so poorly.

A bit of care and finesse would see a better balanced cutting tool.

That's what I picked out of it. Others may see more.

Oz
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Old 04-26-2020, 09:08 AM
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There is someone who does not understand drills. Has he made a video of sharpening twist drills yet?
What sized holes do you need, and how deep? A stick of powder is 8 inches.
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Old 04-26-2020, 09:55 AM
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I guess there are tools that I have never thought about making, but if you have a need for a certain size hole in wood, this is possible. And some of us are able to do this, and make it better. If you only have one hole, then you do not need super hard steel. Just a little time, and steel, which most of us have.

Now, some of us have more $ than time, so those are the ones that will go out and buy one, or pay someone else to make the hole, but the challenge of making my own appeals to me. Sometime I will try it when needed.


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Old 04-26-2020, 10:18 AM
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Do you suppose that guy ever heard of a file ?? :-)
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Old 04-26-2020, 02:12 PM
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I suppose it would work in a pinch if a person wasn’t too particular about the work he did. Maybe he’s going for the “rat chewed” look with his holes. ;-)
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Old 04-26-2020, 04:15 PM
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Wow. Not sure if he wasted more time making that, or if I did by watching it....

I guess the difference is that, even with the knowledge and equipment to make something like that, I would either buy a spade drill for $5, or use a $10 hole saw. Something special like the custom countersink I made a bit ago and posted on here is a little different story.


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Old 04-26-2020, 05:02 PM
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Both bevels on the same side? One rubbing and one scraping!!! Might be OK as a trepanning tool for thin wood if you want a beaver finish, though their teeth are sharper.

I'll bet that insert was mild steel. If not, it wasn't heated hot enough before the quench.

No clue.

For stumps, get a really long twist drill (2 foot) like you would use to drill holes when nailing up a retaining wall using 4 x 4s and using the long nail spikes. Then put that stump rot stuff in there. (potassium nitrate?) Many small holes = few big holes.
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Old 04-28-2020, 04:11 AM
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[QUOTEBoth bevels on the same side? One rubbing and one scraping!!!][/QUOTE]

I'm glad someone else saw this. lol

My only point.
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I never thought I'd live long enough to become a grumpy old bastard. Here I am, killing it!
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