LumberJocks

DIY Zero Clearanace Throat Plate: Riving Knife Slot for Dewalt 744XRS?

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by 5x10 posted 03-23-2013 02:49 PM 2907 views 0 times favorited 7 replies Add to Favorites Watch
View 5x10's profile

5x10

4 posts in 579 days


03-23-2013 02:49 PM

Topic tags/keywords: question tablesaw

I’m working on making my first zero clearance throat plate for my first table saw. (Dewalt 744XRS) I’m a total noob; didn’t even know what/why these were for until the other day.

I’m running into two issues so far:

1. The blade won’t retract far down enough to allow me to drop the new insert in at all. Do I need to buy a smaller blade to start the cut, or is there another way?

2. I’d love to continue using the riving knife and blade guard assembly; is there a trick to cutting the slot further back to allow the riving knife through? (I’m considering flipping it over to extend the length of the cut w/o cutting all the way back.)

My progress so far:

-- Safety Third!


7 replies so far

View Mark's profile

Mark

423 posts in 626 days


#1 posted 03-23-2013 04:03 PM

I took the blade of my circ saw (7 1/4” blade). Installed it and lowered it, put my insert in place. Slid my fence over the plywood insert. Started the saw and raised the blade. Be real careful where you put the fence. You don’t want the blade to come up into the fence. As far as the riving knife is concerned. Figure out how much extra length you need on the slot to accept the knife and cut that out with a jig saw. Hope this helps.

-- Mark

View 5x10's profile

5x10

4 posts in 579 days


#2 posted 03-24-2013 03:25 AM

Thanks Mark, I went to the BORG and bought a cheap 7 1/4” blade, placed the fence as you suggested (carefully) and raised the blade as far as it would go to get the kerf slot started. That worked great.

I was able to use a jigsaw to extend the slot for the riving knife, but I wound up having to cut all the way through it, since the thru-cut position on the riving knife needed the full clearance in the back when fully raised.

Since this is only plywood, I’m now concerned about structural integrity and binding on the blade, but will do some careful testing.

I think maybe I now know why the Leecraft aftermarket throat plates for the DW744 and 745 have a disclaimer re: the Dewalt factory splitter/guards as being incompatible with these plates.

http://www.forrestsawbladesonline.com/product_630_Leecraft_ZeroClearance_Table_Saw_Insert_139_16L_x_33_4W_DeW.html

-- Safety Third!

View Mark's profile

Mark

423 posts in 626 days


#3 posted 03-24-2013 03:05 PM

5×10. I’m thinkin’ if you’ve cut all the way through on one end you can’t have much strength in that insert. You don’t want to be any where around there if that plywood breaks and catches the blade. If there is a PROPER after market insert, spend the money. Safety first. Saving a buck second.

-- Mark

View huff's profile

huff

2804 posts in 1937 days


#4 posted 03-24-2013 03:32 PM

5×10,

How often do you have to raise the blade to it’s fullest height? I found that when I made my zero clearance insert, I made the slot long enough that I could raise my blade and riving knife at least 1 1/2” and that left plenty of stock left at the end of my insert for strength.

I found I really don’t cut stock that thick that I need to raise my blade to it’s fullest height, but when I do, I simply switch back to my regular insert.

-- John @ http://www.thehuffordfurnituregroup.com

View 5x10's profile

5x10

4 posts in 579 days


#5 posted 03-24-2013 09:15 PM

@Mark, I needed to hear that. Tossing that one in the scrap pile and starting over. I made a few more blanks last night, but I may buy at least one after market insert for comparison.

@huff, #headsmack! I can’t believe I didn’t see that, great point! I haven’t made enough cuts on the saw yet to have really thought that through; sounds obvious now that you’ve spelled it out for me. Thanks so much for pointing that out.

-- Safety Third!

View Mark Davisson's profile

Mark Davisson

493 posts in 1969 days


#6 posted 03-25-2013 12:16 AM

5X10, here’s an alternative that you may or may not like: http://www.microjig.com/products/mj-splitter/

-- I'm selfless because it feels so good!

View Quanter50's profile

Quanter50

157 posts in 948 days


#7 posted 03-25-2013 01:14 AM

Here is a riving knife I made for my homemade zero clearance insert. I used a piece of walnut and a piece of aluminum road sign. I made this to use with the thin kerf blade. Works great.
:

Have your say...

You must be signed in to reply.

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

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase