LumberJocks

Shop Built Table Saw Overarm Blade Guard with Dust Collection

  • Advertise with us
Project by Marv88 posted 01-20-2022 03:23 PM 5413 views 10 times favorited 22 comments Add to Favorites Watch

Finished up the overarm blade guard/dust hood for my Unisaw. I previously had a Biesemeyer overarm but didn’t like the hood so I made my own. That worked out better however as with most of the guards I’ve used/seen in action the pivoting assembly was sloppy as well as difficult to reposition on the blade so I decided to address these issues.

First I installed a short section of T track with a shop made sliding assembly made from HDPE plastic/2 pieces of 12mm Baltic Birch glued together so I could easily move it from side to side or remove the entire assembly quickly to change blades/set blade angle etc (the Wood magazine design I got inspiration from used a slot which looked like it would be a pain to remove). I used a toilet bolt for the T track and added a piece of slick strip uhmw plastic to make it slide easily.

To address the sloppiness in the pivoting arms I used 1/4”x1” aluminum flat bars with nylon flange bushings and self locking nuts so there is minimal play while still moving freely.

I noticed that the height adjustment for different thickness of wood on many designs was in the rear which made no sense to me so I designed/made one for the front from HDPE plastic, threaded rod and a plastic wing nut. I tapped threads into the lower piece so when you turn the knob it raises/lowers the hood using the upper pivot arms.

The hood is made from 12mm Baltic Birch and 3/16” Lexan with a viewing window on the front. After mocking it up I realized that if I turned the angled dust fitting to the left it moved the hose completely out of the way for any operation.

The overarm is made from 3 lengths of 18mm Baltic Birch glued together as was the original support for the arm. I immediately noticed the weak link was the support for the arm (it twisted easily) so I made a torsion box from 12mm and 18mm Baltic Birch for that which stiffened it up considerably. I also added the 1/4” aluminum plates for a little extra support just in case.

The Wood Magazine design used a hinge on the back with a draw hasp on the front so the arm could swing away which I tried but didn’t care for. After some thought I figured since I could easily remove the hood assembly I ended up making a simple wood hinge with a 1/4” bolt on top to flip it up out of the way when not needed for certain operations and used adjustable toggle latch clamps front rear to hold it securely. Almost forgot, for a counter balance I am going to add a spring like on the Biesemeyer.

Here is the link to my original design which I realized was over 13 years ago!

https://www.woodworkingtalk.com/threads/shop-built-table-saw-overarm-dust-collection-hood.45394/

-- "Post count on a forum does not denote level of knowldege, skill nor experience"





22 comments so far

View Marv88's profile

Marv88

183 posts in 3358 days


#1 posted 01-20-2022 03:25 PM

Hood with easy height adjustment..

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#2 posted 01-20-2022 03:26 PM

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#3 posted 01-20-2022 03:26 PM

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#4 posted 01-20-2022 03:29 PM

Nylon flange bushings…

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#5 posted 01-20-2022 03:31 PM

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#6 posted 01-20-2022 03:33 PM

Overarm…

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#7 posted 01-20-2022 03:35 PM

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#8 posted 01-20-2022 03:40 PM

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#9 posted 01-20-2022 03:42 PM

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#10 posted 01-20-2022 03:47 PM

Torsion box arm support..

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Marv88's profile

Marv88

183 posts in 3358 days


#11 posted 01-20-2022 05:03 PM

I wasn’t sure if my little wood hinge would support the hood when flipped out of the way but it seems to work fine.

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Northwest29's profile

Northwest29

1720 posts in 3949 days


#12 posted 01-20-2022 08:25 PM

Wow, excellent job! Great photos for reference too. I’m going to redesign my over arm setup now that I’ve seen yours’s. What are you using for the dust extraction? Big thanks for sharing.

-- Ron, "Curiosity is a terrible thing to waste."

View Marv88's profile

Marv88

183 posts in 3358 days


#13 posted 01-20-2022 08:57 PM

Thanks and glad I could provide some inspiration! I’m using a Delta 50-760 with a Super Dust Deputy, 5” primary duct, 4” to lower saw port and 2 1/4” shop vac hose to the hood. I have separate blast gates for top and bottom so I can dial in suction at either point as necessary (it works best with the 4” port on the bottom partially closed)


Wow, excellent job! Great photos for reference too. I m going to redesign my over arm setup now that I ve seen yours s. What are you using for the dust extraction? Big thanks for sharing.

- Northwest29


-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View oldrivers's profile

oldrivers

3111 posts in 3025 days


#14 posted 01-20-2022 09:07 PM

Looks great may be just what I need seeing I have planes to build a guard soon. Thanks for posting and the pictures were super.

-- Soli Deo gloria!

View Marv88's profile

Marv88

183 posts in 3358 days


#15 posted 01-20-2022 09:27 PM

Thanks and you’re welcome!


Looks great may be just what I need seeing I have planes to build a guard soon. Thanks for posting and the pictures were super.

- oldrivers


-- "Post count on a forum does not denote level of knowldege, skill nor experience"

showing 1 through 15 of 22 comments

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com