Strange diamond shape scallops on wood (new shelix install)

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Forum topic by Tmanpdx posted 04-16-2019 10:09 PM 1650 views 0 times favorited 10 replies Add to Favorites Watch
View Tmanpdx's profile


26 posts in 452 days

04-16-2019 10:09 PM

I’m seeing this strange pattern across the wood and I was hoping someone had seen this before & could point me in the right adjustment direction.

It’s a 4 post 20” planer with new shelix head installed. See attached pictures for the diamond shaped scallops.

10 replies so far

View Richard Lee's profile

Richard Lee

293 posts in 1515 days

#1 posted 04-16-2019 11:58 PM

I have a Shelix head on my planer and its nothing like that.
Talk to Shelix, check the inserts and make sure they are all installed correctly.

View Aj2's profile


2981 posts in 2538 days

#2 posted 04-17-2019 12:07 AM

My Powermatic has 15hh or the bryd style head.
It does leave consistent texture they all do. But your looks inconsistent in your pic. :(

-- Aj

View bilyo's profile


1087 posts in 1843 days

#3 posted 04-17-2019 02:27 PM

The pattern seems to follow the grain of the wood. I think that the planer causing this irregular pattern would be unusual. To be sure, I suggest that you try planing a different species with closer grain like cherry, or poplar and see if the same thing happens.

View pottz's profile


9541 posts in 1725 days

#4 posted 04-17-2019 02:47 PM

i just put a shelix on my jointer last night and man it’s sandpaper richard said send these pic’s to shelix and they can instruct you on how to fix this issue.

-- sawdust the bigger the pile the bigger my smile-larry,so cal.

View CaptainKlutz's profile


3042 posts in 2235 days

#5 posted 04-17-2019 03:23 PM

+1 appears to follow grain pattern

What kind of wood was used?

Does wood have top coat applied, or is this straight from planer?

FWIW – Have seen similar hi/lo patterns on softwood (juniper and white pine) slabs with large grain direct from straight blade planer. Best way to smooth out softwood slabs is with wide belt sander due large soft early-wood spots. ROS or hand sanding doesn’t help level surface as it follows the early/late wood grain boundaries. Sharp hand plane is 2nd fastest way to smooth out softwood.

If that is softwood and grain is as large as it seems in that slab, will always have a texture issue. Early wood changes at different rate then late wood during environmental swings. Even a perfectly flat slab will show ridges under extreme humidity changes from when it was initially finished.
FWIW – Made some rustic slab tables for family hunting lodge many years ago; it was unnerving and amazing to witness texture difference across grain between winter and summer. Thought I had mistake, till I read up on stark differences between early and late wood.

If this is hardwood, have only seen ridges follow grain like that after sanding too aggressively?

Best Luck finding cause.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

View LesB's profile (online now)


2518 posts in 4183 days

#6 posted 04-17-2019 07:16 PM

I think CaptainKlutz may have a good idea about sanding. Did you sand it?
Whether it is that or the planer it is obvious that the soft wood is being removed faster than the hard grain.

-- Les B, Oregon

View pottz's profile


9541 posts in 1725 days

#7 posted 04-17-2019 09:25 PM


hey when you figure this out make sure and let us know the cause,im considering changing my 15” delta to shelix also and dont want to spend 700 bucks if it’s not gonna give me a big improvement.

-- sawdust the bigger the pile the bigger my smile-larry,so cal.

View LittleShaver's profile


661 posts in 1360 days

#8 posted 04-18-2019 12:39 PM

You may be on to something. Looks somewhat like the “hand scraped” flooring that seems to be the rage. You need to make it trendy and the public will beat a path to your door.

Sorry, but I can’t provide any advice on how to fix this. I just couldn’t help from making a snarky comment.

-- Sawdust Maker

View Tmanpdx's profile


26 posts in 452 days

#9 posted 04-19-2019 05:35 AM

I haven’t figured it out, but I’m still trying to research. It’s not happening on all boards. I ran through some curly maple today and it was fine.

I looked at the suspect board in the pics I posted again and it’s got a small cup and I wonder if that is having an impact. I need to find another board that is cupped and see if I can duplicate it.

I’m also in discussion with Tom Byrd and he’s been very helpful. He’s even offered to exchange the head if it’s out of balance. I’m not positive this is the case so I’m going to do some more research and plane some more boards.

View edapp's profile


340 posts in 2170 days

#10 posted 04-19-2019 12:38 PM

If the board is not jointed on the other side it may be moving under the cutterhead.

Looks like it is not flat and it has cracks in it which may mean parts of the board are moving while running through the planer causing this scallop? Does it do it on a smaller, jointed board?

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