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How to use the mortising attachment on a Kity Planer?

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John Baddeley09/03/2014 20:37:18
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I have owned a 439 for a while now, and always wondered about the attachment for mortising. I can't find any info on using one.
Anyway I called NMA and rashly ordered one from them. Having received it I can see no way you can use a normal powered mortise chisel (as used in a powered mortising machine) with it - am I right?
If so I assume you use a milling bit and finish with a round ended mortise, as if it were done with a router.
Would some kind soul confirm this, or put me right, please?

(Obviously, it came with no instructions; if any are available, please point me to them.)

Thanks, John.

Mailee09/03/2014 22:10:13
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1048 forum posts
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Yes John you are correct in your assumption, there are special cutters for it. I have not used one myself but have seen one in use. If I remember correctly it consists of a small table that bolts on to the side of the machine. This table can be moved horizontally by means of a handle to plunge into the cutter and then moved from side to side to cut the mortice. The cutter screws onto the end of the cutter block spindle. I am afraid I can't help with any instructions though sorry.

John Baddeley10/03/2014 00:40:06
53 forum posts
2 photos

Thanks Mailee, you're right - two levers move the table (to plunge and move sideways).

Mine came with a chuck (just like on a drill). Presumably an end-cutting spiral cutter would suit.

Does anyone else have any info/experience, please?

John F10/03/2014 22:59:15
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John,

I have one of these and yes they do/did come with a spiral cutter to make the mortise, they work reasonably well with a little care but of course you need to clean out the corners with a chisel.

If you PM me with your email I think I have a PDF of some instructions for these units.

John F

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