Oh wow. On the contrary, ash is on the harder end of domestic hardwoods, and its elasticity means it tends to warp and cup pretty badly when drying out.
How long did you acclimate this wood to your shop before making that top? It may not have been long enough.
This top was made by someone else about 8 months ago and remained solid until recently.
I'm gonna check again soon to see if the C bars do anything. If not then removing the pith it is. It just doesn't feel comfortable jointing on site, gotta bring my No.7 plane, find something to hold it while planing...
Take the top off and rip the pith out. Tilt the base on its side and clamp the pieces on both ends just like you have in the picture, but extend the rough edge out the side (which is now facing upwards).
That should hold it just fine while you plane it. I realize it'll be a little skewed which will make getting 90 degrees harder, but the rip cut should already have you damn near 90 and you can pinch grip the toe of the plane while using the backside of your pointer finger as a reference against the board to try and anchor yourself to 90. You should only need really light passes.
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u/Morael 5d ago
Oh wow. On the contrary, ash is on the harder end of domestic hardwoods, and its elasticity means it tends to warp and cup pretty badly when drying out.
How long did you acclimate this wood to your shop before making that top? It may not have been long enough.