First Dado - Table Saw Miter Sled - Page 2 - Router Forums
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post #11 of 14 (permalink) Old 03-06-2019, 09:44 PM
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Pan head and truss head screws have a lower profile than typical round head type screws. Some screws will hold much better if you drill a pilot hole. Some don't need it as much. In particle board and mdf the pilot hole is close to being a necessity. The screws tear up the fiber so badly trying to get enough bite to keep threading that there isn't much material left to hold them by the time you finish sinking them.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #12 of 14 (permalink) Old 03-06-2019, 11:18 PM
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Quote:
Originally Posted by Nickp View Post
I would not use any screw that has a taper...it will expand the runner. Counterbore and flat bottom (truss, modified truss, pan, etc...). The more the merrier...
excellent...
but you forgot to tell him about the double stick tape, make a clearance hole for screw in the UHMW and that Fostner bits do the best counterbores...
Note:
Truss heads screws, (aka K lath) are large dia heads that also have a very low profile... pilot drill for them and yur golden..

and FWIW..



.
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

Last edited by Stick486; 03-06-2019 at 11:41 PM.
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post #13 of 14 (permalink) Old 03-07-2019, 06:04 AM Thread Starter
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Default Working Too Late, Too Tired

I was doing pretty well with this sled, until tonight.

I got the runners mounted. Counterbored the runners and used regular round screws because that is all that is available locally. Counterbore that I used is 12mm (0.472") so I will have to check to see if I can find truss/lath screws in Baker City. I wasn't planning on going but things conspire....




I did the runners and rear fence yesterday and earlier today. No problems, other than the sled is a touch snug in one spot. I think I need to open up the clearance hole in the UHMW runners so the screw isn't pushing the runner sideways at all.

I was up very late tonight (last night) with some worries about family matters and could not sleep. So, I figured I'd work on putting in the holes and threaded inserts for the front fence. It was all going well, getting it lined up (square with the saw kerf), pilot holes placed in the bases/fence.


And then I went to counterbore for the screw head relief holes. I forgot to turn the sled over. Counterbores were supposed to go on the bottom. But... I put them on the top.


I'll try plugging these holes/counterbores and then redilling/CBing from the right side. If that doesn't work, I'll just trim off an inch and try again. However, as things happen, I am not sure when I will get back to this.

Rick
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post #14 of 14 (permalink) Old 03-07-2019, 06:38 AM
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Quote:
No problems, other than the sled is a touch snug in one spot.
shoulder plane is the perfect fix for that...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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