Museum quality seams usually refers to water clear bonds with little on no bubbling in the seam. The edge preparation that is best for this is a proper cut right off the CNC machine. You cannot get quite the same edge quality using hand routers and route tables. The feed and speed control of a CNC router is so much more consistent than any hand operation. That said I built most of the aquariums with hand operations over 30 years. The current technology is so much better with a CNC machine!Question for Lowell Lemon and Tenecor...when it comes to seems on acrylic aquariums . Do you recommended hand polished museum quality seems or solvent welded regular seems?
You know there are new technologies that allow the CNC to cut a polished edge. But in my humble opinion the largest majority of tank builders in the past flame polished. I did for close to 30 years and I had very few problems. Hand polishing is going to be more expensive in terms of labor and materials. Polishing by hand or with a flame creates induced heating of the acrylic surface. Flame polishing can create more heat if you do not move the torch quickly. The torch is Hydrogen and Oxygen and creates a flame at about 6300 degrees Fahrenheit, if I recall correctly. Just a brief exposure to the flame "glazes" the surface and should not heat a large section of the edge. If you move to slow the edge can catch on fire! Oops, in that case you might increase the chance of crazing (micro cracking) in the future. Exposure to alcohol or petroleum distillates seems to increase the possibility of crazing. I cleaned the surface of new aquariums with water and a few drops of dawn diswashing liquid in a spray bottle before packaging for shipping.
Anytime you polish acrylic the sheet manufacturers used to recommend heat annealing the entire assembly after the final polish. No one to my knowledge ever did that except a DOD manufacturer I provided polished acrylic chassis for in the 90's and 2000's. I did offer it to customers but they balked at the price. I even offered it when I built a couple 16' long aquariums for a customer and I would have been renting a 40 plus foot autoclave for the 24 hour heat cycle.
So, to answer your question I give the customer what they want. So I do hand polish sometimes but at a higher price due to the added expense. It does not make economic sense to hand polish large numbers of production aquariums due to the pressure to deliver large quantities at a reasonable price.
I have not received the custom router bit that polishes yet. But soon I will be experimenting with it.
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