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Author Topic: Blades for wide cut  (Read 766 times)

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Offline Pabene

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Blades for wide cut
« on: May 13, 2018, 03:07:48 PM »
 
I have a log band saw and have cut boards during 15 years. The mill is designed for 1 blades. The motor is a 7,5 kW three phase. When I start to cut a log, about 30 diameter, I would like to have blades with a pitch of 1.25 1.5.  I can not find 1 blades with more than 1 pitch on the market. IMO, the blades with 7/8 or 1 pitch, has to small gullets to make a wide cut.
When I am lifting a board, 10 wide, I can see the blade with 7/8 pitch, starts to leave sawdust already after 8 in the cut.
In all other cases of sawing, cold saws for metal, vertical band saws, circular saws and so, you have to select a blade with suitable gullets for the thickness of the material you are going to cut.
I want to ask here on the forum if someone know why we not can order 1 blades wit larger pitch.
 


Offline MartyParsons

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Re: Blades for wide cut
« Reply #1 on: May 13, 2018, 09:00:04 PM »
Hello,
  I assume "Pitch" is the space between the tooth?  1 1/8" is available through WM.
  7.5 KW = 10 hp? Is this correct? Electric motor hp is a little different than engine hp?  There is not a torque curve on a electric motor like a gas or diesel motor would have.
10 electric is close to a 25 hp gas engine. ?

Here is my opinion.
     10 hp is not much in relation to using a wide tooth spacing blade.
     I would try a 7 degree with the 29 degree back angle blade. 7/39   7/8 tooth spacing  1.25 width.  WM name is the Turbo blade.
     You could also try a smaller gullet witch would used less hp. 9/29  ( this goes against your theory)
     Other things to think about.   Blade speed, WM likes 1 mile a min or 5200 SFM
                                                Feed rate would also effect the saw dust size, slower makes fine dust
                                                Many band saws use a narrow band in tough sawing conditions ( Frozen) with great results 1.25" widths.
                                                Bi Metal, Carbide etc will stay sharp longer may help.

Hope this helps.
Marty
A pessimist sees difficulty in every opportunity; an optimist sees opportunity in every difficulty. -Winston Churchill

Online Skipper11A

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Re: Blades for wide cut
« Reply #2 on: May 14, 2018, 12:23:54 AM »
When I am lifting a board, 10 wide, I can see the blade with 7/8 pitch, starts to leave sawdust already after 8 in the cut.
Pabene, the only problem that I hear is that you are leaving sawdust between the boards.  I'm not sure that this is a problem.  I haven't heard you mention a real problem yet.  Are your cuts flat or are they wavy?  If your cuts are wavy, that's a problem.  If your cuts are flat, then you have no problem.

Offline Pabene

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Re: Blades for wide cut
« Reply #3 on: May 16, 2018, 04:12:10 PM »
Skipper11A, I have no real problem but I miss 1 1/2" blades with tooth space of about 1 1/4". For us with lower hp I am sure it would be good. (It can be good for all). I have performed a test with a blade as I had cut away every second teeth. That way I know it is in the "right direction" to go for wide cut.
I am not good enough in English to explain all details. Maybe some here can tell why the blade maufactory just make maximum 1 1/8 tooth space.


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