andrew whicker
03-19-2018, 1:16 PM
HI all,
I'm making the joint below and putting some 1/4" steel in the middle to help with strength. The joint is 5" wide. Is 5" over the cross grain short enough that I can use epoxy or do I have to consider a contact glue that allows growth differences between the two mediums?
Metal: 300 series stainless (high thermal expansion rate for metal)
Wood: Walnut
Wood grain: Will run at an angle along the elbow
What is the assumption for temperature changes in a house? 50 F very worst case scenario? When I use delT = 50 F, I get a change of ~.0025" (over 5 inches) for the stainless.
What is the assumption for humidity change in a house? (I live in N. Utah. It's already really dry here)
Below are some pics of what I'm trying to do (drawing not finished yet). The stainless flat stock will be sandwiched in the entire elbow, but attempting to show that in SketchUp just quickened my balding. You can see where I drew some lines to represent the stainless flat stock. Apparently not all radii are created equal even if they are the same value. Who knew? (Somebody offered me some quick "how to's". I need to take them up on this offer before I lose all my hair)
381853
381854
I'm making the joint below and putting some 1/4" steel in the middle to help with strength. The joint is 5" wide. Is 5" over the cross grain short enough that I can use epoxy or do I have to consider a contact glue that allows growth differences between the two mediums?
Metal: 300 series stainless (high thermal expansion rate for metal)
Wood: Walnut
Wood grain: Will run at an angle along the elbow
What is the assumption for temperature changes in a house? 50 F very worst case scenario? When I use delT = 50 F, I get a change of ~.0025" (over 5 inches) for the stainless.
What is the assumption for humidity change in a house? (I live in N. Utah. It's already really dry here)
Below are some pics of what I'm trying to do (drawing not finished yet). The stainless flat stock will be sandwiched in the entire elbow, but attempting to show that in SketchUp just quickened my balding. You can see where I drew some lines to represent the stainless flat stock. Apparently not all radii are created equal even if they are the same value. Who knew? (Somebody offered me some quick "how to's". I need to take them up on this offer before I lose all my hair)
381853
381854