S-Splice Lams

[Watsonjay]

Another heads up on your CNC millwork. I see you are cutting the shelf out too. While this isn't a bad thing, I would be very careful on your depth using the CNC having a sharp 90 degree transition from the shelf to the strike plate section is not a good thing. Those risers can crack at the belly side of the shelf or even the back side unless that transition has a slight radius.  I would highly recommend cutting it an 1/8" shy of the finished depth cutting that shelf, then use your random orbital sander to finish shaping it. It will be much stronger getting rid of that sharp 90 degree cut line.   

Food for thought.


Another thought might be using a cutter bit with a slight chamfer at the tip, or a tiny round over. But I don't know how that would effect your other machine work...

Ya I always take a round file to the edge but that's a good idea, I can swith the bit to a bull nose when I go to cut the shelf to already start the rounding.

[Watsonjay]

Turned out okay for the first one. I need to work on the shape as distance in the middle isn't very even.

[Kirkll]

What kind of woods are those?    

[Watsonjay]

The brown is katalox and the middle is spectraply

[Kirkll]

That's a lot of work hand fitting footings of that shape. Hopefully you are not forcing those joints together with clamps. That can come back to haunt you down the road.  Just saying....   But they look pretty cool.

Once you get set up with a pattern sander, it takes all the sanding and fitting time out of footed risers. It's well worth the investment. .02 cents worth.

[Watsonjay]

It isn't that bad with the cnc. It is 1/8" bit so it creates the 1/8" gap. I grabbed 2x 1/16" materials. Warmed them up a little for more flexibility glued and clamped. Not really that much pressure as there is the perfect space for it.

[Kirkll]

It isn't that bad with the cnc. It is 1/8" bit so it creates the 1/8" gap. I grabbed 2x 1/16" materials. Warmed them up a little for more flexibility glued and clamped. Not really that much pressure as there is the perfect space for it.

Are you saying the two riser pictures above was done with a CNC ?

[Watsonjay]

Yes. I cut the footer with the cnc. Cut the footer then glued 2 different woods together then cut exterior and limb pads with cnc. Then all the shaping by hand.

[Kirkll]

Hmmmmm.....  Then why do the two of them look different side by side? And why does the shape of the footing have a wiggle, or difference in thickness in the center section?
Was that done purposely? 

[Watsonjay]

They are the same. One shows the lines in your design view and the other shows what the cuts look like in the material

[Kirkll]

Must be an optical allusion with the different colors in the spectra ply accent strips I'm seeing.

[Watsonjay]

Must be an optical allusion with the different colors in the spectra ply accent strips I'm seeing.

There was a little jog in my drawing that I fixes so it wont do that on the next job.

[Watsonjay]

I tweaked the design a little. The middle is a bit thicker now. Seems to be working out well.

[OldRawhide42]

How are you holding it to the table  ???

[Watsonjay]

I put painters tape to table then painters tape to back of riser. A bit of super glue on table tape and accelerator on riser line up quickly and press down. When done I use a card scraper to start then the tapes pull up easily after that.

[OldRawhide42]

Thanks

[Watsonjay]

Next thing to try is the lam splices.

[Kirkll]

I tweaked the design a little. The middle is a bit thicker now. Seems to be working out well.

I will be curious how the bow looks with limbs mounted on the riser. and how you finish the limb butts on the bottom with that J hook going up to the limb pad.

 That's a very unique design that may require some thought in the future using solid wood vs spectra ply. I see no issue with the spectra.   But An I - beam may be needed for limb pad strength on the bottom with the J hook design for solid wood and the exposed end grain....  Food for thought.   

[Watsonjay]

I tweaked the design a little. The middle is a bit thicker now. Seems to be working out well.

I will be curious how the bow looks with limbs mounted on the riser. and how you finish the limb butts on the bottom with that J hook going up to the limb pad.

 That's a very unique design that may require some thought in the future using solid wood vs spectra ply. I see no issue with the spectra.  But An I - beam may be needed for limb pad strength on the bottom with the J hook design for solid wood and the exposed end grain....  Food for thought. 

I actually got rid of a bit of the j-hook. I had to do that for room for the hand as it is only a 14" riser. Here is the current status. I still need to do final shaping but am currently gluing on limb tips and overlay then will do final shaping. Its a 52" and I did put a diamondwood I-beam

[Kirkll]

That's going to come out looking sweet!