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Router Slab Flattening Jig

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Project by doubleDD posted 10-13-2021 08:05 PM 1839 views 7 times favorited 44 comments Add to Favorites Watch

My new flattening jig came about when I bought this ball bearing CNC like set up a guy was selling down the street for 20-25 bucks. I knew immediately this would work well for slab flattening.
I used a old 36’’ wide standard door and cut it down to 60’’. The router holding plate is 3/8’’ plywood and screwed to the 4 sliding blocks. I cut a 2 1/2’’ hole for the router bit.


I got to use some of my old bandsaw bearings for the sideways movement.They are held in place with a 3/8’’ bolt and washer and I made 4 wood knobs and used a wood threader to tighten the bolts.


I screwed the bar guides to the bearing set up and slid them on the 7/8’’ bar. This bar has no flex and with the unique bearings in the 4 blocks and the bandsaw bearings it slides around like butter. Up, down, sideways, even a circular motion can be achieved. The best part is only a hand sanding is needed after planing. Maybe because of the smoothness?
I already did 5 slabs and have a few more to go. This jig is for a couple projects coming up.
My old flattening jig which was all wood with wood sliding on wood worked fine but this one makes it look like a antique now and works much smoother.
My total cost for this was 20-25 dolllars. Everything else was scraps or things I had on hand.
Thanks for looking. I’ll be glad to answer any questions.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.





44 comments so far

View recycle1943's profile

recycle1943

5853 posts in 2865 days


#1 posted 10-13-2021 08:24 PM

that really looks to be the cats meow – do you have a heigth adjustment on the rig or do you adjust the slab ?

-- Dick, Malvern Ohio - my biggest fear is that when I die, my wife sells my toys for what I told her I paid for them

View pottz's profile

pottz

20663 posts in 2227 days


#2 posted 10-13-2021 08:29 PM



that really looks to be the cats meow – do you have a heigth adjustment on the rig or do you adjust the slab ?

- recycle1943


thats a good question dick.i dont see a way to do that ?

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View Redoak49's profile

Redoak49

5390 posts in 3232 days


#3 posted 10-13-2021 08:37 PM

very well done.

I assume that he just adjusts the height of the router bit with the router.

What router bit are you using? What would those parts cost for the slides?

View pottz's profile

pottz

20663 posts in 2227 days


#4 posted 10-13-2021 08:38 PM



very well done.

I assume that he just adjusts the height of the router bit with the router.

What router bit are you using? What would those parts cost for the slides?

- Redoak49


true but that is very limited.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View gdaveg's profile

gdaveg

363 posts in 445 days


#5 posted 10-13-2021 08:40 PM

I have had a use for that device a couple of times. I guess you adjust the height of the router in its mounting base to get the bit to the correct height.

Way cool.

-- Dave, Vancouver, WA & Tucson, AZ

View Cliff 's profile

Cliff

2032 posts in 2967 days


#6 posted 10-13-2021 09:07 PM

Hi Dave ….Very well thought out and should be a great asset for your Shop.
Regards…....Cliff

-- Cliff Australia : Snoring is good. It blows away all the Sawdust.

View doubleDD's profile

doubleDD

10703 posts in 3286 days


#7 posted 10-13-2021 09:22 PM

Redoak49 I’m using a Sugelary planing bit from Amazon for $18. The bar and blocks with bearings and the ends are there also. There’s a big variety there depending on how long you want the bars. I chose 42’’ bars which is wide enough for my tables.

Pottz you have a unlimited height limit depending on the wood side rails.

Thanks gdaveg. It’s such a pleasure to use I want more slabs. LOL

Thanks Cliff. It will make a big difference in the shop. Best of all I can store it back in the garage where the old door was sitting for years being used as a table in emergency. hahaha

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View Rich1955's profile

Rich1955

384 posts in 634 days


#8 posted 10-13-2021 09:36 PM

This is great Dave, I’ve been thinking of making one of these for my router, but with your ideas I think I’ll have a change of plans on how to make it. Thanks Dave, this idea is genius.

-- Rich

View John's profile

John

2107 posts in 2513 days


#9 posted 10-13-2021 09:55 PM

That should do a good job for you Dave. Good work!

-- John, Sunshine Coast, BC, Canada.

View Jim Jakosh's profile

Jim Jakosh

26786 posts in 4349 days


#10 posted 10-13-2021 10:07 PM

Excellent jig, Dave, That is definitely TOP SHELF!!!!!!!!!!! I love those bearings. I have a set on my duplicator and they are so smooth.

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View splintergroup's profile

splintergroup

5863 posts in 2465 days


#11 posted 10-13-2021 10:39 PM

Great way to take advantage of those now cheap and available linear bearings, ground shafts, and hardware!

I made something similar as a guide for my wife’s glass cutting jig (1/2” shaft), no more trying to keep the cutter square to the glass.

Now the firewood pile will look more like your future project lumber stash.

View mafe's profile

mafe

13341 posts in 4332 days


#12 posted 10-13-2021 10:49 PM

Love the ultra hightech meeting recycle and scrap.
Cool jig, it must be a joy to operate, with those bearings.
Best thoughts,
Mads

-- MAD F, the fanatical rhykenologist and vintage architect.

View doubleDD's profile

doubleDD

10703 posts in 3286 days


#13 posted 10-13-2021 11:52 PM

Hi Rich. Certainly nothing wrong with the many traditional ways of making these but this one is a pleasure to use. Almost as if it’s a automatic and not a stick shift. Here’s a tip. I have a solid door and 2 hollow core doors and I chose to use a hollow core one. Works just as good and a heck of a lot easier to move around.

Thanks John. The results are worth it.

Thanks Jim. I agree these bearings are the beast. I may consider using these in future jigs. I bet that duplicator jig works like a charm.

Thanks Splint. Sounds like you’re familiar with these rail slides. I bet you can cut glass with your eyes closed now using these set ups. I’ll be keeping these in mind from now on.

Thanks Mads. Yep high tech and old recycling scrap. Old and new make things go smooth. LOL.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View therealSteveN's profile

therealSteveN

8858 posts in 1817 days


#14 posted 10-13-2021 11:59 PM

Pretty sure one of those high dollar premade ones won’t get you any flatter. So if it works, the only thing is, if it’s trouble free to use, sounds like winner winner chicken dinner time. :-) Nice build Dave.

-- Think safe, be safe

View GR8HUNTER's profile

GR8HUNTER

8982 posts in 1956 days


#15 posted 10-14-2021 12:05 AM

im curious what holds the boards in place ? :<))))) LOVE the bearing idea thou

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN :<))

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