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End Grain NIP Tear Out (Read 295 times)
 
Steve Doerr
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End Grain NIP Tear Out
Oct 30th, 2018 at 8:42pm
 
I have a large bowl that I have turned from a piece of end grain NIP. The problem is that I am getting some tear out in some of the growth rings. I've tried a lot of different tools, sharping frequently, and have found the best results with a traditional ground bottom gouge. I've also tried using shellac to help firm up the end grain, but it has not been totally effective.

So, how do all of you that turn end grain NIP keep from getting tear out? Since I cored this piece and have three other bowls yet to turn, any help you could give me would be greatly appreciated.
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Ed Weber
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Re: End Grain NIP Tear Out
Reply #1 - Oct 31st, 2018 at 9:45am
 
You may need to shellac, skip the gouge and move straight to sanding.
Depending on what your final finishing product is and whether or not the shellac is tonally sanded away, you may need to flood the area with a thinned version to achieve the same thing. I have seen NIP totally submerged in danish oil or other concoction before final turning and/or sanding,
You must have some weak fibers in that one area that will most likely be present in the other two cores
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robo_hippy
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Re: End Grain NIP Tear Out
Reply #2 - Oct 31st, 2018 at 10:48am
 
Ron Kent, of Hawaii, used the LDD (liquid dishwashing degergent) soak, specifically for the NIP, to prevent resin build up on the abrasives. He also soaked it in Deft Danish oil so that the wood would be totally penetrated with the oil. This improved the translucent features of this wood.

Cutting with the grain in this is probably part of the problem. You are cutting end grain, so on the outside, push cut from rim to base, and on the inside, pull cut with shear scraper from bottom to rim, exact opposite from standard bowl grain orientation.

robo hippy
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Arlin Eastman
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Re: End Grain NIP Tear Out
Reply #3 - Nov 2nd, 2018 at 4:14pm
 
robo_hippy wrote on Oct 31st, 2018 at 10:48am:
Ron Kent, of Hawaii, used the LDD (liquid dishwashing degergent) soak, specifically for the NIP, to prevent resin build up on the abrasives. He also soaked it in Deft Danish oil so that the wood would be totally penetrated with the oil. This improved the translucent features of this wood.

Cutting with the grain in this is probably part of the problem. You are cutting end grain, so on the outside, push cut from rim to base, and on the inside, pull cut with shear scraper from bottom to rim, exact opposite from standard bowl grain orientation.

robo hippy



I have done 3 and still have another 8 NIP to do.  What Robo said is the way and best way to do so.  My very first one was way worse then that and set it aside for 3 years until I learned more on turning.

They no longer sell deft but I still have a gallon of it since I love the stuff and way better then the other Danish oil.  I do do extra sanding with 80 grit to start and even then not a heavy hand or it can tear out sometimes to.  It never fails now that shear scrapping does the trick.
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Jay Pugsley
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Re: End Grain NIP Tear Out
Reply #4 - Nov 14th, 2018 at 7:37pm
 
What is NIP?
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Ed Weber
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Re: End Grain NIP Tear Out
Reply #5 - Nov 14th, 2018 at 8:04pm
 
Norfolk Island Pine
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Jay Pugsley
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Re: End Grain NIP Tear Out
Reply #6 - Nov 15th, 2018 at 3:31am
 
Thank you!  I even googled it, but the results were not what I expected!   Sad
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Don Stephan
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Re: End Grain NIP Tear Out
Reply #7 - Nov 15th, 2018 at 2:05pm
 
Is there a document on the forum with common abbreviations, Ed?
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