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Edge quality off of edgebander3/29/15
How many of you are adding additional processing (such as hand scraping) to your finished parts off of your edgebander?
We have a very large job in house with ALOT of edgebanded parts. Our edgebander has scraping and buffing capabilities. When dialed in the edgeband looks very good to my eye right off the machine. However, my thumb can feel a very slight ridge; the banding is proud of the part by a whisker (0.2mm maybe).
If we hand scrape as part of our "wipe down and put on pallet" process, it adds about 30 seconds to each part, which adds up very very fast on a large job
So, would you guys run right off the bander? As far as the customer is concerned, I really think they'd be fine with it. We have ran parts right off the bander for them before and they haven't mentioned it. Pricing has already been negotiated, so I'm hesitant to bring it up. I'm interested in your opinions...
We have a Cehisa ep-9. It will band standard PVC tape without any touch up as long as glue line is kept to just right and we are running 3/4" material. When we switch to 2mm pvc,we change the cutters on screen to position 2 and it still does a great job. The textured 1mm tapes are in between and do need a slight scraping with a blunt blade as the radius cutter is 2mm. The end trim is rarely perfect, but wearers small shop and would probably need a to have a Bander in the 50k range or higher to do a flawless job. We use allot of high gloss acrylic in white within matching 1mm tape and it looks quite good, but the sheets have a thin blue plastic protective film and we always have to touch the edges with a file or knife to get them almost invisible. The new laser banders are not in our financial range and there are not a lot of tapes available for them. Harold.
A large job gives you the opportunity to tweak until the parts are perfect. My experience was the cause was often not where I thought. You do not mention banding thickness. I used primarily 1 mm tape, and after much angst, learn the problem was due to variation in banding thickness. So each roll was miked and the trimmers set accordingly. The thicknesses would be marked on the inside of each roll to allow resetting when changing colors or thicknesses. My machine had digital readouts to allow easy resetting. This resolved most of my issues after that. I also learned it was worth having the local tech come in annually to tweak the machine back to baseline settings. He had the patience to fine tune where I did not.
PVC banding does vary in thickness, sometimes even with in a roll. So tweaking the machine a bit is part of the process. We can get a near perfect flush and as long as the banding stays uniform the machine will maintain it's settings. We run mostly 2mm. We try to run a thin glue line. I've noticed when it is too thick a little will rise up after trimming. We've got 4 motor end radius trims but get some glue squeeze out on the trailing end. Some times near perfect, sometimes not. We don't have a return so the off bearer checks the parts as he sorts them.