Question
I build furniture and added a Timberking 1220 mill to my arsenal last year. I've cut seasoned white oak, sweet gum, pine, cedar, and some 40" DIB red oak since I've had it. It's been a good mill and cuts great. I've never had problems cutting any of the above (unless the blade got dull). It has smooth consistent cuts with plenty of power.
Now I'm cutting some fresh SYP - small diameter (6-12") and I’m having problems. I've had to slow my feed rate way down due to the blade stalling (not the engine), and can easily stop the blade if I don't just creep along. The blade stops while the drive belt keeps turning (no slippage from the drive belt). I've increased tension on the blade but it doesn't help.
My conclusion is that the tires (really belts) are worn out and allowing the band to slip. What do you think? I've never replaced them. They are not glazed over, and stick up around 3/64-1/16" above the wheels, but that's the only thing I can think of. I've also tried two new blades, and the back of the blade doesn't even hit the thrust bearing when it stalls, so I don't the blade is the issue. I feel pretty confident the tires are the issue, but wanted to get a second opinion before ordering replacements. How do you all determine when to replace them? I plan to try Urethane (from Suffolk). Any opinions on them?
Forum Responses
(Sawing and Drying Forum)
From contributor A:
I use belts on my WM and have to change them about every three months, but I cut a lot. Do you know the set of the blades you are using? SYP will grab the blade if the set is not wide enough. Also the sap in SYP will cause the blade to slip. Use water that has about two shot glasses of Pinesol per 5 gallons of water to cool and lube the blade. It just needs to drip on there.
If the belts are not glazed then they are not most likely the problem. It does not hurt to change them as new belts will grab better and are taller. How do you measure tension on the blade? It could be a bit low which will allow the band to slip on the belts.
Also one other thing, I have never had this problem like your describing, but possibly your blade lube in conjunction with your belts could be causing this issue. I cut SYP all the time and my mill just cuts right through it. I have no opinion on the Urethane belts, I just know what works and is tuff.
I am using water/Pinesol for a coolant/lubricant as you recommend. I run a small stream onto the blade. One thing I noticed was that I have more sawdust sticking to the tires (under the blade) than I normally do. I'm not sure if this would allow slippage or not.
The mill uses a compressed coil spring for tension. There is a red line that the manufacturer recommends tensioning to. When I first tried TW blades I ran their recommended flutter test and the tension setting was just shy of the red line. I've been running at the red line normally. This morning I went past the line to see if it helped (it made no difference). The tension spring is in good shape and there is no binding in the mechanism.
Contributor R - you are correct about the tires being V-belts on 19" sheaves; however, they are very tight on the wheels. There is no slack or slop in them. Thanks for the info on the NAPA belts.
Contributor W - thanks for your honest feedback. I am surprised about the vibration problem but am now glad I asked before ordering.
After thinking about it I plan to mark the tires with white paint in a spot and run the mill, stalling the blade. As soon as it stops I'll peek in the guards and see if the tire is still moving; that should verify if the tires are the problem. Any more ideas/recommendations?
Contributor A, thanks again for the help. Since the belts are not glazed I'm thinking they may be slipping as you mention (that's why I plan to try marking the belts to see if they're spinning with the wheel or slipping). I didn't have a chance to check anything today, but hopefully will get back on the problem tomorrow.
I had assumed (I know, I know) that the drive belt was not slipping since there was no squeal in the belt, but I assumed wrong. Opening the guard (again, don't do this!) allowed me to see what was really going on in there. I tensioned the belt and everything is working great again.
Contributor A, there's always a good side to everything! As you mentioned, I now know more than I did so it was a good day. When I stop learning I guess I'll quit! Three blades for 4k walnut isn't too bad. Most of them I've seen have a lot of metal in them (usually from a yard though).
Common Lumber Name | A | B | C |
Hardwoods | |||
Alder, Red | 9.9 | 19.2 | 2506 |
Apple | 10.9 | 31.7 | 4132 |
Ash, Black | 9.3 | 23.4 | 4132 |
Ash, Green | 14.3 | 27.6 | 3590 |
Aspen, Bigtooth | 10.3 | 18.7 | 2439 |
Aspen, Quaking | 10.3 | 18.2 | 2373 |
Basswood | 6.2 | 16.6 | 2174 |
Beech, American | 8.9 | 29.1 | 3793 |
Birch, Paper | 8.8 | 25.0 | 3260 |
Birch, Sweet | 11.9 | 31.2 | 4065 |
Birch, Yellow | 9.2 | 28.6 | 3723 |
Buckeye | 8.9 | 17.2 | 2235 |
Butternut | 11.3 | 18.7 | 2440 |
Cherry | 13.8 | 24.4 | 3184 |
Chesnut, American | 11.6 | 20.8 | 2708 |
Cottonwood | 8.5 | 16.1 | 2102 |
Dogwood | 6.8 | 33.3 | 4331 |
Elm, American | 10.2 | 23.9 | 3116 |
Elm, Rock | 12.2 | 29.6 | 3860 |
Elm, slippery | 11.5 | 25.0 | 3251 |
Hackberry | 11.8 | 25.5 | 3319 |
Hickory, Bitternut (Pecan) | 14.7 | 31.2 | 4062 |
Hickory (True) | |||
Hickory, Mockernut | 9.1 | 33.3 | 4332 |
Hickory, Pignut | 9.3 | 34.3 | 4332 |
Hickory, Shagbark | 10.9 | 33.3 | 4333 |
Hickory, Shellbark | 6.6 | 32.2 | 4195 |
Holly, American | 8.3 | 26.0 | 3387 |
Hophornbeam, Eastern | 7.9 | 32.8 | 4266 |
Laurel, California | 15.1 | 26.5 | 3456 |
Locust, Black | 21.2 | 34.3 | 4470 |
Madrone, Pacific | 7.8 | 30.2 | 3925 |
Maple (Soft) | |||
Maple, Bigleaf | 12.8 | 22.9 | 2980 |
Maple, Red | 13.1 | 25.5 | 3318 |
Maple, Silver | 12.4 | 22.9 | 2981 |
Maple (Hard) | |||
Maple, Black | 12.3 | 27.0 | 3523 |
Maple, Sugar | 12.3 | 29.1 | 3793 |
Oak (Red) | |||
Oak, Black | 11.7 | 29.1 | 3792 |
Oak, California black | 16.4 | 26.5 | 3455 |
Oak, Laurel | 6.3 | 29.1 | 3791 |
Oak, Northern red | 13.6 | 29.1 | 3793 |
Oak, Pin | 13.0 | 30.2 | 3928 |
Oak, Scarlet | 13.2 | 31.2 | 4065 |
Oak, Southern red | 9.6 | 27.0 | 3520 |
Oak, Water | 10.4 | 29.1 | 3793 |
Oak, Willow | 6.4 | 29.1 | 3790 |
Oak (White) | |||
Oak, Bur | 15.4 | 30.2 | 3928 |
Oak, Chestnut | 10.1 | 29.6 | 3858 |
Oak, Live | 17.5 | 41.6 | 5417 |
Oak, Overcup | 10.7 | 29.6 | 3860 |
Oak, Post | 11.0 | 31.2 | 4063 |
Oak, Swamp chestnut | 10.7 | 31.2 | 4063 |
Oak, White | 10.8 | 31.2 | 4062 |
Persimmon | 7.0 | 33.3 | 4332 |
Sweetgum | 8.9 | 23.9 | 3115 |
Sycamore | 10.7 | 23.9 | 3115 |
Tanoak | 9.0 | 30.2 | 3926 |
Tupelo, Black | 10.4 | 23.9 | 3116 |
Tupelo, Water | 12.4 | 23.9 | 3115 |
Walnut | 13.4 | 26.5 | 3454 |
Willow, Black | 8.6 | 18.7 | 2438 |
Yellow-poplar | 10.6 | 20.8 | 2708 |
Common Lumber Name | A | B | C |
Softwoods | |||
Baldcypress | 13.2 | 21.9 | 2844 |
Cedar, Alaska | 14.4 | 21.9 | 2844 |
Cedar, Atlantic white | 10.9 | 16.1 | 2100 |
Cedar, eastern red | 16.4 | 22.9 | 2981 |
Cedar, Incense | 13.1 | 18.2 | 2371 |
Cedar, Northern white | 11.1 | 15.1 | 1964 |
Cedar, Port-Orford | 12.6 | 20.2 | 2641 |
Cedar, Western red | 12.2 | 16.1 | 2100 |
Douglas-fir, Coast type | 12.3 | 23.4 | 3049 |
Douglas-fir, Interior west | 13.2 | 23.9 | 3116 |
Douglas-fir, Interior north | 14.0 | 23.4 | 3048 |
Fir, Balsam | 9.9 | 17.2 | 2236 |
Fir, California red | 10.6 | 18.7 | 2437 |
Fir, Grand | 10.7 | 18.2 | 2371 |
Fir, Noble | 10.1 | 19.2 | 2507 |
Fir, Pacific silver | 10.4 | 20.8 | 2711 |
Fir, Subalpine | 10.5 | 16.1 | 2101 |
Fir, White | 12.2 | 19.2 | 2506 |
Hemlock, Eastern | 12.6 | 19.8 | 2573 |
Hemlock, Western | 11.5 | 21.8 | 2847 |
Larch, Western | 11.3 | 25.0 | 3251 |
Pine, Eastern white | 12.3 | 17.7 | 2303 |
Pine, Lodgepole | 11.5 | 19.8 | 2576 |
Pine, Ponderosa | 12.6 | 19.8 | 2573 |
Pine, Red | 12.2 | 21.3 | 2777 |
Southern yellow group | |||
Pine, Loblolly | 12.9 | 24.4 | 3183 |
Pine, Longleaf | 15.0 | 28.1 | 3658 |
Pine, Shortleaf | 12.9 | 24.4 | 3183 |
Pine, Sugar | 12.6 | 17.7 | 2302 |
Pine, Western white | 10.0 | 18.2 | 2370 |
Redwood, Old growth | 14.9 | 19.8 | 2573 |
Redwood, Second growth | 13.2 | 17.7 | 2302 |
Spruce, Black | 11.3 | 19.8 | 2575 |
Spruce, Engelmann | 10.0 | 17.2 | 2234 |
Spruce, Red | 10.6 | 19.2 | 2506 |
Spruce, Sitka | 10.8 | 19.2 | 2506 |
Tamarack | 12.0 | 25.5 | 3318 |