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Mortise or Tenon for Resin Bowl (Read 169 times)
 
Chris Fontana
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Mortise or Tenon for Resin Bowl
Mar 31st, 2021 at 4:40pm
 
I am thinking of trying to turn a resin bowl.  Most of the videos I have seen use a mortise.  I usually use a tenon and was wondering if a tenon was possible with resin.
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Rusty Nesmith
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Re: Mortise or Tenon for Resin Bowl
Reply #1 - Mar 31st, 2021 at 6:28pm
 
I watch a lot of Nick Zametti videos on YouTube and he uses a tenon with acrylic. What he does though is add a piece of wood sticking out to make the tenon from. He doesn’t make the tenon out of acrylic.
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Steve nix
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Re: Mortise or Tenon for Resin Bowl
Reply #2 - Apr 1st, 2021 at 7:13am
 
I’ve only do tenon and only use straight jaws on my one way chuck. Tapered jaws tighten too tight will have a tendency to pinch off acrylic tenons.
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Ed Weber
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Re: Mortise or Tenon for Resin Bowl
Reply #3 - Apr 1st, 2021 at 8:40am
 
Steve mentioned what I was thinking.
Not knowing all the physical/mechanical properties of "resins' I wouldn't treat them the same as wood.
I would look for a holding solution that doesn't rely on the strength of the resin without knowing what it's capable of.
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robo_hippy
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Re: Mortise or Tenon for Resin Bowl
Reply #4 - Apr 1st, 2021 at 10:21am
 
Well, I don't know resin at all. That being said, my main concerns would be how tight of a bond does the resin have on the wood. If there was resin in the tenon or recess, I would be cautious, making sure to take small cuts and make sure to have the tenon or recess snug, but not tight. I would also make sure to stand out of the line of fire at all times. Overtightening is a common problem that can cause failures with both tenon and recess. A big piece would require more caution than a small piece. Perhaps turn the outside of the bowl, and leave a very shallow recess, 1/16 or less, then glue a waste block to the bottom and the waste block has a tenon to match the recess in the blank. That gives a better grip, and makes it easier to center.

robo hippy
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Chris Fontana
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Re: Mortise or Tenon for Resin Bowl
Reply #5 - Apr 2nd, 2021 at 5:53pm
 
Thank you all for you answers.  Have watched a lot of videos and the mortise seems to be the preferred way.  Either way I would think resin is not as strong as wood.
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robo_hippy
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Re: Mortise or Tenon for Resin Bowl
Reply #6 - Apr 3rd, 2021 at 11:26am
 
Most important part of using a mortice is having enough shoulder to back up expanding pressures. I do cover that in a video I did 'Mounting things on the lathe', here in the video section, or on You Tube.

robo hippy
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Ed Weber
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Re: Mortise or Tenon for Resin Bowl
Reply #7 - Apr 5th, 2021 at 11:14am
 
Chris Fontana wrote on Apr 2nd, 2021 at 5:53pm:
Either way I would think resin is not as strong as wood.


That may be a dangerous assumption.
Resin may have equal or greater than the strength of your wood in one way but not another
Just as some species will bend without breaking, others are brittle and will crack readily. Add that to the point about the resin to wood adhesion that Reed mentioned and there is enough evidence to be cautious
i hope it works for you, I just mention this for everyone to be safe.
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