(WOODWEB Member) :
Our smaller Holz-Her 1310 has been having trouble cutting 3mm PVC tape lately. We have sharpened the knives and that did not help. I have checked the guillotine - it is free and working well. We keep the tape at about 65-70 degrees, turn the air pressure up to about 6.5-7 bar on the guillotine, and still it won't cut through the 3mm PVC tape. Has anyone else had trouble? Right now we are cutting pieces to length and that is a pain. I will call Holz-Her and our supplier to see if I can find anything out.
From contributor L:
Is your oiler working? Did you open up the cylinder to see if the seal has gone bad?
1) Disconnect air pressure from the machine and see if you can slide the guillotine knife back and forth freely. If not you may have some burrs on the back of the guillotine that you'll need to knock down with a knife sharpening stone.
2) You likely have a problem with the fast exhaust valve at the front of the guillotine cylinder. It could be full of debris, or like a previous poster mentioned, the port filter could be clogged.
About a month it galled up and would not slide easily, so I cleaned it up and then when I assembled it I lubed it with grease (too much, as I was afraid it would repeat again). The other day when I checked to see if it slid freely with the air off the machine had been running for some time and everything was warm/hot and it slid freely. Today when I checked again, it was cold and sure enough it was a gummy mess and would not slide.
I cleaned everything up and wiped a light coat of 3n1 oil as I was told to use. When I tightened the screw up on the bronze piece that the knife slides on I noticed I could tighten it down enough and it would cause the knife to bind up when reaching the end of its cut. So I backed it off just a bit and used the nut on the other side to lock it down and hold it in place. Now it moves free and there is a very slight movement in the knife. Now it cuts the 3mm at 4 bar just fine. I also checked the bumper inside the air cylinder (cushions the end of the stroke) and it looked like new. I was told this was another area to look as these will break up and cause problems with air exhaust and delivery.
Missing things like this is caused by me being in a hurry and not thinking things through. I should have checked it for sliding freely more than once!
As a side note - regarding the lube for the guillotine knife, I would suggest a light film of fresh Gleitmo 805 (Holz-Her track grease) on the back side of the knife. Fresh Gleitmo 805 is the right consistency to hang in place and provide excellent lubrication for the life of the guillotine knife edge.