My initial reaction is that 50% compression, or even 30% is way too much for these.
What plywood? Do you feel you need a wider lip for sealing or for strength?I decided on a 3/8" lip on the inner walls:
tony.latham wrote:What plywood? Do you feel you need a wider lip for sealing or for strength?I decided on a 3/8" lip on the inner walls:
Tony
tony.latham wrote:I just found this recommending a 25% compression for 1/2" Trimlock D-shaped seal. I'm sure that's for a flat surface compressing it.
https://www.trimlok.com/rubber-extrusion/epdm-seal/d-profile/101-series
Tony
First though, I think I'll try building a little jig and see how much compression of the seals ....
tony.latham wrote:First though, I think I'll try building a little jig and see how much compression of the seals ....
I ordered some 1/2" x 1/2" this morning and will stick in my mock-up and will let you know what I think.
Tony
KTM_Guy wrote:I think you are better with the foam type EDPM (Not open cell foam that will hold water) over the high density foam. I did my hatch a little different than the manual. Instead of using the 1/8" router bit (dangerous in my opinion) I used a 3/8" bit to give me a bigger gap which I use a 1/2" EDPM hard foam gasket on. This gives me another sealing gasket along with the normal one in the Fredricks manual. May main reason is not for water but dust. So far it seems to be working fine, I will at some point change the EDPM to the foam type. We have been having some cold wether (Don't laugh cold for us, I even wore long pants to work two days this week) around 30 degrees and that high density foam was like a rock. Very little compression or spring back.The low density or foam EDPM I had in the garage was much more squishier. Is that a word?
Todd
Nearly the same latitude, about 6200 ft difference in altitude!
tony.latham wrote:Nearly the same latitude, about 6200 ft difference in altitude!
Holy, smokes... I'm at 4,000 and 45º
tony.latham wrote:I just received a roll of 1/2" x 1/2" Trim-Lok D-Seal. I think this is what I'll go with
It'll work well with an 1/8" of compression.
Tony
I used a 3/8" bit to give me a bigger gap...
tony.latham wrote:I used a 3/8" bit to give me a bigger gap...
Todd:
A spiral upcut bit with a bushing and template? Carbide?
Tony
KTM_Guy wrote:tony.latham wrote:I used a 3/8" bit to give me a bigger gap...
Todd:
A spiral upcut bit with a bushing and template? Carbide?
Tony
Yes, yes and yes. Did a few passes. I’ve been real happy with the Whiteside bits from Amazon. Been replacing all my old bits with them when I need to replace.
Todd
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