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We use a Leuco hollow ground blade for cutting on a Holzher panel saw. My question is 2 parts. 1. How many panels should we expect to cut clean (on the grid side) before a blade change (3/4" melamine), and how many sharpenings should we expect to get out of each blade? Thanks
I think It depends on the material core, pine being easier to cut than fir. Sometimes we get two hours on a blade and sometimes a week. Cutting anything other than melamine with the blade seems to reduce the melamine cut. We always change the blade when changing material. I usually have several hollow ground blades in service at the same time. The newest one for cuts that matter two sides and a more used blade for cuts that only one side matters. I have a Striebig and changing blades isn't all that tough. I think the hardest thing about hollow ground blades is getting them serviced correctly.
Thank you Bruce. I appreciate your response.
I have had very poor results with Leuco and other hollow ground and blades on a Striebig Compact (250 mm blades). They are expensive to buy, expensive to sharpen and don’t last very long. If I could get a dozen sheets of melamine chip free on the frame side, that would be a lot. And I don’t have to tell you, but once you have chipping on that side, the blade is done for melamine. I added scoring and now use triple chip blades and get much better blade life and no chipping on the frame side after dozens of sheets.
I can confirm what Bruce said about getting them serviced and what to cut. I have been told that not everyone can sharpen them correctly. I sent mine to Forrest Manufacturing and assumed that they knew what they were doing. Also, never cut anything other than melamine until they start chipping on the frame side.
I hope this helps.
Thanks Mark. All these responses are helpful as I think our shop is a "victim" of a salesman's false promises. We have a new Holzher panel saw (8 months old) in a shop with little manufacturing experience. Their expectations (as told by the salesman as recently as 2 weeks ago) was they should be able to cut 50 to 100 sheets of melamine and get a clean cut on the frame side even with a dull blade! Exact words. I thought that was insane and as I get more responses to my question, it confirms what I thought. Hollow promises. I will try a triple chip to see if we get a better result.
No way possible, at least in my experience and I am very careful in the set-up and maintenance of my equipment.
I have wondered if the diameter of the blade plays a roll in their longevity and that is why I mentioned the size of my saw blades. Smaller size = bad results ------ larger size = good results???
Which Holz-Her saw did you get and what is the blade size? I am assuming that it is a vertical panel saw because I don't think that I have ever heard of someone using hollow ground blades on a sliding panel saw.
I have to check, but I think that Leuco was what shipped on the Striebig as well. The weird thing was that while it was chipping on the frame side the exit side of the blade was clean. It was very frustrating….
I seem to recall someone saying that they were getting good life out of the hollow ground blades but I think they were using an Elcon vertical with 300mm blades, hence my statement about the size maybe making a difference. Different geometry, more teeth, runs cooler, angle of attack,etc. I don’t know… Maybe Bruce will chime in and let us know what size blades he is using.
The triple chip with reverse scoring for the odd piece or dropping the scoring blade when cutting a lot of important parts solved the problem for me, so I never researched it further.
Can you add the pre-scoring blades to you saw if you are not getting the results you desire?
Although my experience with melamine is limited, I've ran a vertical saw for almost 30 years, cutting veneer core ply. I know PB core melamine will dull the blades faster than ply. I used those hollow ground blades in the beginning, but they do not stay sharp because of the fine point at the corners of the tips. They cannot disperse the heat created at the fine tips, thus they dull quickly.
I have had good luck with a high angle ATB with a 0 to -5 deg hook angle. I ran a Putch saw for years that had a 250mm blade. I think the tooth count was 80 for that blade. They lasted a long time cutting ply with no scoring. Triple chip blades do not work well with veneer core ply.
I am use 300mm blade. I usually up score cut about a 1/6" deep before making the full plunge on the down stroke. On a Striebig you can set the riving knife to control the up cut depth.
i have many customers that use a tcp or a atb grind with 2-5 deg. neg. hook works well cuts well TCP grind stays sharp the longest
I can't seem to find a TCG in a 250mm dia. / 30mm bore for the Holzher. Any help?
Lots of manufacturers to choose from. My Striebig takes that blade size (with two additional pin holes) and I have never had a problem finding blades.
Call your local reputable saw blade dealer/sharpener.