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Did WM come out with a new tooth design or am I being punked?

Started by jimbarry, December 02, 2020, 05:00:12 PM

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jimbarry

Customer dropped off 10 blades to be sharpened. 6 I did before. 4 are first time in the shop. REALLY deep gullet. The profile guide doesn't match the 7º or 10º. The rest of the profiles aren't even close. Customer says the blades were bought new from WM, first time being sharpened.

What are they?

10º profile comparison


 

7º profile comparison



 

terrifictimbersllc

It looks like 7/39.5 (7 turbo). Anyway yes that one's gullet is deeper than either of those two gauge profiles.

If I could see it with the teeth pointing the other way which is the way I usually look at a blade,  I'd be more sure whether it's 7/39 or the new 7/47 but it still doesnt look like the latter to me.
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

jimbarry


terrifictimbersllc

Sure looks like 7/39.5 (7 turbo) to me.  Top picture right two teeth look like they have a negative face angle, maybe its just distortion in the photo.  We saw whole batches of blades with that feature when JB and I visited Liberia. 

I dont know how to crack that serial number code but maybe woodmizer would. 
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Magicman

Here is a picture that I just took showing the 7° gauge and a section of 7/39, (Turbo 7) blade.


 
That should answer your question.  ;D
98 Wood-Mizer LT40 SuperHydraulic    WM Million BF Club

Two: First Place Wood-Mizer Personal Best Awards
The First: Wood-Mizer People's Choice Award

It's Weird being the same age as Old People

Never allow your Need to make money
To exceed your Desire to provide Quality Service

Stephen1

IDRY Vacum Kiln, LT40HDWide, BMS250 sharpener/setter 742b Bobcat, TCM forklift, Sthil 026,038, 461. 1952 TEA Fergusan Tractor

YellowHammer

Its a Turbo, the deep gullet is why they perform better than the standard 7 in wide cuts.
YellowHammerisms:

Take steps to save steps.

If it won't roll, its not a log; it's still a tree.  Sawmills cut logs, not trees.

Kiln drying wood: When the cookies are burned, they're burned, and you can't fix them.

Sawing is fun for the first couple million boards.

Be smarter than the sawdust

jimbarry

Sure looks the same. Thanks for taking the time Magicman to snap a pic. 

So these Turbo 7's, best used for hardwood wide cuts? The local WM dealer sold the customer the blades. Customer cuts spruce, pine and hemlock, 6-15 inch diameter, using a LT40.  Would a 9º or 10º  perform better? 

Magicman

Not for me.  I never had but one trial 9° blade and phased out my 10° blades several years ago.  I only use T7° blades, although I do have a box of 4° blades at Resharp now.
98 Wood-Mizer LT40 SuperHydraulic    WM Million BF Club

Two: First Place Wood-Mizer Personal Best Awards
The First: Wood-Mizer People's Choice Award

It's Weird being the same age as Old People

Never allow your Need to make money
To exceed your Desire to provide Quality Service

terrifictimbersllc

I used turbo 7 on Lt40 42HP 158" 045/1-1/4 for 4-5 years moving on to these from 9/10 degree, and T7 only in 055/1-1/2/195" with 55 HP.   T7 is more general for high performing in all wood vs the other two and excellent cutting  pine and hemlock.  Knotty spruce is the only place it isn't perfect but once you break down to narrow widths it is fine.
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Stephen1

I mainly used 10's on the old 24 onan lt40hd, when i picked up the new lt40hdwide with the 38, I took a box of 10's. what a nightmare. I was sawing semi frozen EWP and nothing but waves, I spent a few days of frustatation adjusting the mill in cold snowy weather trying to figure out the new mill. Brian at WM sent me some sample 7's and  7T's and 7carbide. Well the carbide worked like a charm, until i hit that 1st nail. The 7's were OK but the once I put on the 7/39T I haven't looked back. It is the only thing I run now in everything. I did upgrade to 7/39T BIMETAL in 1.25" and love them. I have thought about going to 1.5" but I do know they do not get as many sharpenings. Only so many revolutions around the wheels before they break.
IDRY Vacum Kiln, LT40HDWide, BMS250 sharpener/setter 742b Bobcat, TCM forklift, Sthil 026,038, 461. 1952 TEA Fergusan Tractor

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