Monday, October 14, 2013

How to Drill the Mortise on a Moulding / Molding Plane

UPDATE: SEE MY NEW METHOD HERE!

That title should probably be "What to use to drill a mortise on a moulding plane" but the "how to" must start out with the right tool. The wide mortises are easy. There are several different options to choose from in a typical shop but what about those really narrow mortises. Like the number one to four sizes. Basically anything 3/16" and under.

I have done the gimlet bit thing. They are great if you can first of all find the narrow ones and they are not all beat up and crooked and dull. That is difficult to find and I never found a narrow one that cut correctly as is. If you do find them they have many times been attempted to be cleaned up to make look nice for sale on eBay and thus dulled even further or someone tried to sharpen them and might as well have ruined it. I wish they were easy to sharpen but it is about as hard to sharpen as is sharpening a spoon bit. Once they are messed with too much in the wrong way then it is a nightmare to get them back to right. Well, at least it is for me.

So now that I have scared you off from trying to drill your mortise with a gimlet (sorry) let me tell you what I use.


I stumbled upon these little auger bits made in Japan by Star-M. They are a real jewel. Unlike a gimlet bit you don't have to constantly remove them from the hole to clear the shavings expect right near the very end. They cut through at the bottom cleanly. Once you get them tracking straight they will keep on that path. That is a plus but also a downside where as the gimlet lets you steer them if you need to correct your path. But on the other hand that is the downside to a gimlet. You have to constantly keep them on course. They tend to drift if left to their own. They also will over heat easily and dull or even suddenly break off in the mortise which has happened to me. Ouch!


Ok so where to buy these little guys. I bought mine from a supplier in Germany. www.fine-tools.com. They are reasonably price but the shipping is costly, as you would expect. They sell a small bit brace that fits the hex shanked bits that I use. It is decent but I am going to make one eventually that is more suited to me. Of course you can use your standard two jaw brace and use an adapter or these bits can be used in a power drill, according to the manufacturer. I have not tried this myself.

I use the 3mm for the smallest wedges, the 4mm and 5mm for most everything else. If I had to suggest one it would be the 4mm since it tends to be one that I use the most.

Hope that helps you out in making those narrow mortises!

7 comments:

  1. I Just picked up a couple of these bits for about $10/each from a shop in CA (www.hidatool.com). The shipping was steep at $10, but it is better then shipping form Germany.

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    1. I use a different drill now but at the time I ordered these Hida didn't have the long ones. They only had the short ones which wouldn't quite reach far enough for a moulding plane.

      Thanks

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  2. Yes, I realized that after I bought some. It's good you put this comment here in case others follow the path that I did. For future reference, they have them in three different sizes now. I got the regular (ie not short, or long) ones and it was totally adequate for drilling a mortise for a rabbet plane.

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    1. Yes I think mine are actually the medium length but again for anyone that is reading this... I placed a link to an updated post on how I do my drilling by hand now. It is different and much more accurate and efficient.

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  3. The brace is pretty neat, what make is it? It looks like it will fit hex or quick release bits

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    1. It is called Kuri Kuri but it is made by Star M just like the bits. It does accept hex bits.

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  4. Very nice, thanks. I've been looking for something to use all my hex bits that isn't an egg beater

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