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Split Top Roubo Bench Build #10: Mounting the Criss-Cross

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Blog entry by ic3ss posted 03-23-2015 01:05 AM 1711 reads 0 times favorited 4 comments Add to Favorites Watch
« Part 9: Finishing up the tail vise Part 10 of Split Top Roubo Bench Build series Part 11: A chop is born »

Yesterday I picked up a 1 – 1/4” forester bit and a 3/8” x 10” long brad point bit at Woodcraft. The forstner bit is for drilling the hole through the chop and leg for the leg vise. The bit is too short to make it all of the way through the leg so I also need to get a forstner bit extension. The 3/8” bit is for the pins that hang the Criss-Cross on the chop and leg. The chop is 9” wide so this was barely able to make it through. I didn’t want to hassle with drilling from each end and the inherent inaccuracy that I’m sure would show up, the pin is a beefy one and not able to do a zig-zag very easily.

First thing was to hog out the mortise that will hold the Criss-Cross. I used a 1 – 1/2” forstner bit. I also had to sharpen it when I started cutting into the hard maple.

My first time assembling the Criss-Cross. I had it in backwards, evidenced by the fact that it wouldn’t go down into the mortise. I had to push the pin out and turn it over.

Much better.

After getting them together, I realized that there was no toe-in as described in the instructions. Had to take it apart and put in the bearing plates on each side. After those were in I had a toe-in exactly what it said I should have. Just a bit less than 3/8” at the bottom.

The 10” long bit was $16 at woodcraft. Fairly expensive but I know it saved me some heartache today.

So then I centered up the mounting plate over the hole and center marked the screw holes with a brad point bit in my hand. Then drilled them out and tapped the threads. I had to test this on a piece of scrap, as I’ve never tapped threads for a machine screw in wood before. I got the screw in and I found that it will hold a lot of torque. I was really pulling on it and was not able to get the threads to strip. Ok, I’m impressed.

So that’s it for today. Tomorrow I’ll get a piece of MDF and trace a side profile for the chop and cut it out. Not sure how it will look exactly, but I have an image in my mind.

Thanks for reading, and have a great day.

Wayne

-- "I am endeavoring, ma'am, to construct a mnemonic memory circuit using stone knives and bear skins."



4 comments so far

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LJackson

295 posts in 1061 days


#1 posted 03-23-2015 04:16 PM

That reminds me, I need to find out the diameter of the pieces of my “cabinet maker’s vise” to make sure I get the correct bit.

I’m making a router sled to flatten my bench’s top, and the simple sled uses two pipes as the runners, but I do not have a bit 1 5/64” in diameter. It’s 3/4” pipe, but I forgot to check it’s outside diameter. I see that 1 1/16” Silver and Deming bits are really expensive, at $35-40 each, but I can get a forstner for under $10.

View ic3ss's profile

ic3ss

387 posts in 2244 days


#2 posted 03-23-2015 05:41 PM

Do you have some pictures? I’d like to see what your sled setup looks like, I need ideas for mine.

Wayne

-- "I am endeavoring, ma'am, to construct a mnemonic memory circuit using stone knives and bear skins."

View LJackson's profile

LJackson

295 posts in 1061 days


#3 posted 03-23-2015 06:59 PM

I’ll try to post some tonight.

View LJackson's profile

LJackson

295 posts in 1061 days


#4 posted 03-24-2015 03:12 AM

Here is a blog entry that I hope explains what I will attempt to do: My blog

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