Knots and Blades

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Forum topic by DaveH posted 04-03-2008 03:09 PM 1506 views 0 times favorited 9 replies Add to Favorites Watch
View DaveH's profile


400 posts in 3775 days

04-03-2008 03:09 PM

Topic tags/keywords: knots blades sharp jointer planner

How has your experience been with jointer and planner blades hitting knots in Douglas Fir on Yellow Pine? Do the blades get nicked? Go dull a lot faster? I have some project that 2×4’s would be a great solution for. I’m just wondering how much damage I’ll do to my equipment.

-- DaveH - Boise, Idaho - “How hard can it be? It's only wood!”

9 replies so far

View Dadoo's profile


1789 posts in 3987 days

#1 posted 04-03-2008 03:53 PM

I haven’t had any problem planing pine with the exception of some occasional tearout in the area of the knots. What really has caused trouble is this 100+ year old reclaimed maple flooring I have. That stuff is so hard it’s dulling the planer blades!

-- Bob Vila would be so proud of you!

View Peter Oxley's profile

Peter Oxley

1426 posts in 3871 days

#2 posted 04-03-2008 04:05 PM

I’ve run a bit of DF through the jointer and planer. I think the knots are probably not as hard as most hardwoods. The issue I have is that Fir and Pine tend to be pretty full of pitch, especially studs which are often sold pretty green. The pitch builds up on the blades which makes them behave as if they were dull. But clean them off and they’re ready to go again.

-- -- --

View ChasHutch's profile


56 posts in 3712 days

#3 posted 04-03-2008 06:09 PM

I just used my jointer to flatten and square 24 yellow pine 2×4s. Seemed to work as expected. The boards are flat, which was the goal.

-- Hutch - North Dallas, Tx - Safety First

View rikkor's profile


11295 posts in 3871 days

#4 posted 04-03-2008 10:28 PM

I have not had a problem with occasional knots. I don’t know if a lot of knots would make a difference.

View motthunter's profile


2141 posts in 3796 days

#5 posted 04-03-2008 10:42 PM

never seen damage from it and I have done it often.

-- making sawdust....

View Scott Bryan's profile

Scott Bryan

27250 posts in 3818 days

#6 posted 04-03-2008 11:11 PM

I haven’t had any problems either. I have run 2×4 studs though to make cauls and other shop pieces. As Dadoo said the knots can lead to tearout in the wood.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

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Thos. Angle

4444 posts in 3959 days

#7 posted 04-04-2008 01:07 AM

I’ve run a lot of knotty Alder with no problems. Never noticed a problem with Pine or Doug Fir.

-- Thos. Angle, Jordan Valley, Oregon

View GaryK's profile


10262 posts in 3985 days

#8 posted 04-04-2008 07:40 AM

I would think that the knots being basically end grain would for sure dull the blade to some degree.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View 8iowa's profile


1580 posts in 3758 days

#9 posted 04-04-2008 03:52 PM

I have little difficulty with knots in pine, unless they are loose! That gets exciting!

Not all planers are the same. Some are best at “hoging down” hundreds of board feet of wood for production requirements, and others are designed to produce a fine finish at the individual project level. My planer can be slowed down to a feed rate of only 7 ft. per minute, and I can sharpen the blades myself to the point where they can shave off the hairs on the back of your hand.

Use sharp knives, light cuts and a low feed rate.

-- "Heaven is North of the Bridge"

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