Is it easy to make Mortises? - Router Forums
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post #1 of 14 (permalink) Old 03-18-2009, 02:18 PM Thread Starter
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Default Is it easy to make Mortises?

Im practising with my router to make mortises on a thick stock but no mater how accurate I measure most of the times Im shy of been flat on both sides.

My problem is not keeping the router straight because I clamp my stock between two 4x 4 pieces and so I have a good surface to keep my router flat and vertical on the surface.

There must be a better way than measuring in order to find the center of the mortise.

Is there a trick, jig or tool that will center the router bit in a piece of lumber?

Thank you
Nicolas
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post #2 of 14 (permalink) Old 03-18-2009, 06:09 PM
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Hi Nicholas,

Oak Park has a simple plate with the mortise bearings that do a wonderful job. But, this can be done with any plate to be honest. I have to ask, are you sure it's the mortises that are off an not the tenons? Even an uneven edge or face could make them not flat.

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post #3 of 14 (permalink) Old 03-18-2009, 07:40 PM Thread Starter
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I found that its easier to do the tenons than the mortise and that is why I said the mortise. We are now talking of a very small difference like 1/32 or 1/64 but noticeable in a cabinet door. Of course it can be sanded down and no one will know the difference.

I know of a lot of jigs in the market for making these joints but they all depend on the user to have the measurements accurately.

My question again is basically if there is a trick, jig or tool to have both the tenon & mortise right on. If not, and its a matter of taking your measurements accurately, then I guess I will have to do just that.

Nicolas
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post #4 of 14 (permalink) Old 03-18-2009, 08:48 PM
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I have several of the Incra rules. Having worked extensively with precision measuring tools, I find them to be the most accurate of any I have used.

http://www.rockler.com/search_result...op+Accessories
http://www.woodcraft.com/family.aspx?FamilyID=443

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post #5 of 14 (permalink) Old 03-18-2009, 09:55 PM
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Nicolas, it might also help if you could describe your procedure in detail. There might be some element that is introducing an error. With a difference of 1/54 to 1/32, that could be as minor as a pencil line, as opposed to using a marking knife, for example. Plus, I'm assuming that you're verifying that all the stock is precisely the same thickness.

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post #6 of 14 (permalink) Old 03-18-2009, 10:08 PM
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Hi Nicolas
You can pick up a jig for 22.oo bucks or just make one that will put the bit right in the center every time..it's base on simple geometry no math needed or any type of pencil mark...

I made one see it below

http://www.rockler.com/product.cfm?p...filter=mortise
====
Plus the one below, it will do it all, out of all the jigs I have to do M & T ,I like this one ,below, the best.
it can be had off ebay and at a great price.. ▼

http://www.routerforums.com/show-n-t...h-m-t-jig.html

==========

Quote:
Originally Posted by kolias View Post
I’m practising with my router to make mortises on a ” thick stock but no mater how accurate I measure most of the times I’m shy of been flat on both sides.

My problem is not keeping the router straight because I clamp my stock between two 4”x 4” pieces and so I have a good surface to keep my router flat and vertical on the surface.

There must be a better way than measuring in order to find the center of the mortise.

Is there a trick, jig or tool that will center the router bit in a piece of lumber?

Thank you
Nicolas


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post #7 of 14 (permalink) Old 03-18-2009, 10:16 PM Thread Starter
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Hi Ralph

You are right Im using a sharp pencil for my markings and I guess, now that you mention it, this is wrong.

I should have used a marking knife or even better get what Mike suggests, an Incra rule.

Using a sharp pencil its difficult to be precise no matter how sharp the pencil is. Never clicked on me. And you are right; I do verify the stock thickness.

Thank you all
Nicolas
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post #8 of 14 (permalink) Old 03-19-2009, 12:32 AM
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This post may help
http://http://www.routerforums.com/jigs-fixtures/10340-base-plate-mortising-how-make-help.html
Worked for me after a few mistakes. I got better the more I made.
bj3 's advice will get you "squared away" then it just take some practice.

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post #9 of 14 (permalink) Old 03-19-2009, 03:57 AM
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You will find a post from me on my mortise cutting jig, which is easy to make and use, also my simple method for the cutting of tenons, pics. will be in my gallery. Try it!!!



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post #10 of 14 (permalink) Old 03-19-2009, 06:19 AM Thread Starter
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Wow, now thats what I call ingenuity......excellent information and what I was looking for...


Thank you all very much
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