Originally Posted by ira-k
Hey it's looking good!..
..Your right if you keep the lower part shallow it should up the velocity a little.
Can you not get a little piece of Delrin there to make a top? It machines really nicely. HDPE might work to though, all I've ever done with it is drill and use files to shape it, but it didn't burn with a drill bit so maybe a mill will work to.
Delrin is 4 times the price of HDPE here .. so it's completely unrealistic when i have to buy it by the square meter.
HDPE is an "engineering" plastic and can be machined.
im gonna see if i can make an acrylic top for this thing now. as i would really like to beable to see the inner workings of the block .. Im sure this will be a bad idea though cos of how flexible acrylic is .... so im sure im wasting my time.... it's all learning for me though