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Roubo Workbench #5: Flattening the tops, mostly.

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Blog entry by Holbs posted 03-11-2019 01:03 AM 530 reads 1 time favorited 5 comments Add to Favorites Watch
« Part 4: Glue and clamp of the 2 slabs of 12" wide x 4 3/8" thick x 7'2" long Part 5 of Roubo Workbench series no next part

Started with my #5 1/2 to get the glue off and do a rough flattening of the top. Will fine tune flatness upon sitting on base structure. Quickly realized, going way too slow. Out comes #40 scrub plane. Much much faster! Finished with #7. Took roughly 3-4 hours using #5 1/2. When I swapped to scrub, took an hour. Lessons learned.
This leaves me with 4 1/8” or maybe 4 1/16” thick of both slabs.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"



5 comments so far

View EarlS's profile (online now)

EarlS

2569 posts in 2648 days


#1 posted 03-11-2019 11:41 AM

As I was browsing through the comments on your previous post I was wondering if you were going to hand plane the top or run it through the planer in 12” wide sections. I suppose these sections could be run through a planer, though I wonder if a DeWalt 735 has enough power to pull something this heavy through the cutter? Since one of these is in my future, looks like I should learn how to use a hand plane.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View Holbs's profile

Holbs

2174 posts in 2329 days


#2 posted 03-11-2019 03:09 PM



As I was browsing through the comments on your previous post I was wondering if you were going to hand plane the top or run it through the planer in 12” wide sections. I suppose these sections could be run through a planer, though I wonder if a DeWalt 735 has enough power to pull something this heavy through the cutter? Since one of these is in my future, looks like I should learn how to use a hand plane.

- EarlS

Earl…after glue up of the lamination boards, you have to contest with all the dried glue squeeze out and the fact that the boards are not flat. If I had simply tossed them into a planer, they would be no where near co-planer. You have to at least flatten one side. And then, decide if you want to run the slab through the planer with the topside glue squeeze out present (not kind to planer blades). Some do… I choose not to. Scrub plane and a little #7 hand plane took longer but end result is the same.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View Holbs's profile

Holbs

2174 posts in 2329 days


#3 posted 03-11-2019 04:17 PM

Earl… I should add, once all dried glue is gone from both sides and having rough flattening, I do plan to stick each slab through my 15” Jet planer to make them the same height.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View DrTebi's profile

DrTebi

282 posts in 3567 days


#4 posted 03-16-2019 07:56 PM

Just a little note:
I was reading the classic roubo bench notes from Benchcrafted, and when they describe the glue-up of the top (which is done vertically), they advise to take off the clamps of one side only after about 15 minutes (when the glue starts to harden) in order to scrape off the glue. Then put the clamps back on and do the same on the other side.

I find that idea intriguing. It might help a lot, since you won’t have to deal with all that hardened glue.

But then again.. your top is already glued up :)

View stefang's profile

stefang

16580 posts in 3634 days


#5 posted 03-17-2019 04:25 PM

I get tired just thinking about all the hand planing I did on my bench top and it was pine. I think its better to eliminate the glue before it gets too stiff and then use a planer, at least for us old guys.

-- Mike, an American living in Norway.

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