Wanted – pressure vessel

Readers of this blog will know that it is unusual for me to admit defeat. Usually, I will doggedly pursue an idea until everyone has pretty much drifted off to cat videos, except for a few readers who check back to shake their heads and mutter such things as “he had so much promise.” However, after two containers and countless attempts at creating gaskets to … Continue reading Wanted – pressure vessel

A good effort at pressure

I’m still grappling with the problem of bubbles in my castings. The accepted wisdom indicates that you want to set polyurethane castings under pressure so the bubbles become very small. I think the Smooth-on site suggests 60 psi (413 Kia). Not having anything that holds pressure, and not wanting to spend a lot of money, I took a trip down to the local Sally Ann … Continue reading A good effort at pressure

Using OnShape to create etching patterns in InkScape

I’ve been experimenting with OnShape sheet metal models to produce patterns for etching parts.  Being designed for ordinary bending processes, OnShape is not directly applicable, but I think it is close enough for my purposes. Here are the sheet metal model parameters that I have found work in OnShape to produce drawings that match the recommendations for etching. Thickness = material thickness Bend radius .0004″ … Continue reading Using OnShape to create etching patterns in InkScape