Compound taper sled.

[Buemaker]

I wanted to have a lamination with a .003 taper going out from the riser and then at a certain point going into a .004 taper in the other direction, kind of like an incorporated tip wedge. I did not have either .003 or .004 tapered lams, but I had .002 and .0015 tapered lams from OMC.
I made an accurate base board from edge grain Jatoba, see picture. I then put the long .0015 lams together and the short .002 lams together and glued them to the base board with the thick ends butting. I used a small short haired roller to spread the glue. After pressing I sligthly rounded the apex of the butting lams with a sanding block and glued on a long strip of abrasive paper. The short .004 section I made 11" long, but I plan to start with a 8" long " tip wedge" in my 64-66" RD glass bows. How you cut the finished ground lams is up to yourself.
How thin you can go depends on the taper rate of the sled.
I made some tests and a 36" lamination with a 8" tip section came out as follows: Riser end .123"- thinnest part with  8" to go .038" and tip .069". This is very close to what I wanted. I was more concerned with the thickness from side to side and it came out right. I'll post some pics.
 

[Buemaker]

[Buemaker]

[Buemaker]

Thick ends of .004 and .003 lams butting, they have same end thickness.
 

[Buemaker]

Lam going into Square head grinder.
 

[Buemaker]

Finished Elm lamination with inch marks to check accuracy.
 

[Roy from Pa]

Pretty cool, Bue...

[Mad Max]

Let's see some better pictures of that Square head grinder Bue

[Roy from Pa]

How about a video of it Bue?

[Krasus]

That's crazy cool!

[monterey]

Very slick!

That would be a great way to grind for a static recurve.

[Buemaker]

Mark here some pictures of the Square Head Grinder. It do not have a motorized feed system, but it does have spring loaded pressure rollers. The massive aluminum drum is driven by a 3 horspower motor. With 60-36 grit cloth backed abrasive paper and the drum going 3000 rpm this thing really eats wood. 2000rpm would have been plenty fast, but 3000rpm is the lowest setting. I have learned to push the workpieces through at a steady pace. It is actually a shaper table with a 30mm spindle and is part of a combination machine that consists of jointer, planer, circular saw, shaper and a kind of router drill that fixes to the jointer arbor. I' ll post some pics.

[Buemaker]

[Buemaker]

Drum with pressure rollers and dusthood
 

[Buemaker]

[Buemaker]

Using miter slot to make sure there is no flex in the fence
 

[Buemaker]

Not exactly thousand of an inch, but it work allright.
 

[kennym]

Bue, that looks like a heavy duty rig! You can buy motorized feed rollers but they seem really high to me for what they are.

[Roy from Pa]

Sweet....