sommerfeld lock miter bit set up

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Forum topic by floridagramps posted 03-18-2011 03:32 PM 2564 views 0 times favorited 3 replies Add to Favorites Watch
View floridagramps's profile


23 posts in 2813 days

03-18-2011 03:32 PM

I am attending tampa woodworking show tomorrow and intend to buy Sommerfeld Tongue and groove, mini raised panel set and a lock miter bit. The Sommerfeld reviews in this forum are generally positive.

Will the bit setting jig sold by sommerfeld make it easy to dial in the lock miter bit for perfect miters on small boxes


-- florida/maine gramps

3 replies so far

View Richard's profile


1871 posts in 2111 days

#1 posted 05-03-2011 06:03 PM

I am a little late on this one but here goes any way. I got the 45 deg lockmiter bit from MCLS and also the setup block for it and just tried it this weekend. To make a long story short I went thru about 20” of poplar tring to get a good joint and still don’t have one.
After a bit of searching around and looking at several videos and other guides on useing the bit, I have kind of figured out that I most likely need a higher fence for the vertical cuts and also a near zero clearence plate for the bit on the router table to prevent any diping of the part as it goes thru the cutter and more backer board or other support for the parts when cutting them. One other thing I found is to make sure your parts are all exactly the same thickness or you are going to waste a lot of time and wood.
So I would advise looking at as many guides as you can on how to use the bit before trying it and get a good idea of what it is going to take to get good clean fitting cuts from it.
I am going to try to make the changes to my table this weekend and see if I can get it right.

View reggiek's profile


2240 posts in 2691 days

#2 posted 05-03-2011 06:29 PM

I have the lock mitre bit from MLCS without the setup block (was on backorder). I set mine up on a horizontal router table (can be purchased from MLCS or there are plans for one on Shop Notes/Woodsmith – I purchased mine as I didn’t have the material needed). The only way I have gotten this to work was with the horizontal router table….to try running accross the bit with the piece standing on the tall vertical was not only very unsafe….but caused so much tear out and chip out that the piece was unuseable – see Richards comments above. MLCS has a nice video showing how to use the bit – they doubleside tape a guiding piece to the project that is used as a guide while the piece goes into the bit) I spend a bit more time in setup….which I may get the setup jig for….but I have now made several nice boxes using that bit….it makes a very nice stable mitre…which can be splined for decoration (and for alignment).

-- Woodworking.....My small slice of heaven!

View TheDane's profile


4936 posts in 3084 days

#3 posted 05-03-2011 08:34 PM

I used the MLCS bit and setup block on a conventional router table to build my dovetail jig workstation. Click for details

I used a Rockler Double Featherboard ( ) and a sacrificial piece of stock taped to the work-piece for the vertical cuts, and another sacrificial piece taped to the work-piece for the horizontal cuts. Felt perfectly safe with both and had no tear-out problems.

It took a while for me to catch onto dialing it in. The test cuts actually produced enough usable material that I was able to make small box for jointer tools and knives.


-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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