Re: Tannewitz PH 32¡± Bandsaw Blade tension questions
¿ªÔÆÌåÓýI don¡¯t have a good way to measure the stiffness.? The new outer and the old spring wire is the same dimension and the same number of turns.? The new inners is not nearly as stiff as it¡¯s a lot smaller wire. ? From: [email protected] <[email protected]>
On Behalf Of David Kumm
Sent: Wednesday, June 2, 2021 4:46 PM To: [email protected] Subject: Re: [FOG] Tannewitz PH 32¡± Bandsaw Blade tension questions ? Joe, is the new spring more or less stiff than the old one?? My oliver 217 will tension a trimaster but I didn't see the spring when it was off so I don't know the dimensions.? My Yates 20" spring was very weak and i put a new $20 one from Iturra on it.? I have experimented with various settings and a Trimaster will saw decently at lower tension but 25K is the sweet spot when resawing wide stock.? What are the inner, outer, and length dimensions?? Dave ? From:
[email protected] <[email protected]> on behalf of Joe Jensen <joe.jensen@...> ? The original spring was a single spring.? The new one is two springs. An outer one the same size as the original and a smaller diameter one wound from square wire that fits inside the old spring.? Later I will put a dial indicator on the arm to see how much deflection I get.? I also wound if my Starrett is accurate but it¡¯s a really simple device, two clamps and a dial indicators so I don¡¯t know how it could go out of calibration. ? From: [email protected] <[email protected]>
On Behalf Of David Luckensmeyer ? Hi Joe: ? I don¡¯t have a tension gauge but have set up many bandsaws over the years, often with the Trimaster blade you reference. I¡¯m sure you set up many yourself as well.? ? I find that while the Trimaster will resaw adequately at lower tensions (eg. at the appropriate 25mm tension on the inbuilt gauge of my Felder FB540), it resaws significantly smoother and faster when I ramp up the tension (eg. so tight the Felder gauge becomes completely unusable as it goes well beyond the highest setting). I¡¯ve done the same with an FB510 and an FB600 and my old Wadkin DR36, among others. The saw and blade performs demonstrably better at high tensions, whatever those tensions may be.? ? It is interesting that the new spring maxes out. The spring on my Wadkin is way too weak as well and I need something much stiffer - I just haven¡¯t gotten around to it. This begs the question: perhaps the carbide modern blades are beyond the tension-ability of the springs on older saws? Your tannewitz advice may be true for older, non carbide bands? I wonder. David K or Mac, any insights here? ? Warm regards, David Lucky ?
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Joe Jensen