Printed motor mount.

[Perry Rose]

What glue is best for attaching the printed electric motor mount to balsa and plywood?

[Steve Berry]

I would use 10 minute epoxy. Even 5 minute would work well.

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[Jim Hoffman]

I used Slow Epoxy (Zap 30-minute Z-Poxy) to bond the 3-D printed motor mount from Okie Air (formerly Tom Morris) to maple.  I also put shallow notches with a jigsaw into the maple surface to give some added mechanical bite.  The faster epoxies are more brittle and less strong, I don’t use them anywhere strength is needed.  70 flights to date, no issues

[Perry Rose]

Thanks for the replies.

[Paul Wescott]

…The faster epoxies are more brittle and less strong, I don’t use them anywhere strength is needed.

Jim - I’ve always found 5-min epoxy to be the opposite of brittle.  It always turns out rubbery and/or flexible when cured, which is why I stopped using it.  Can you please expand on “brittle”?

Paul W.

[Jim Hoffman]

Can you please expand on “brittle”?

Paul W.

Paul you are right.  I had not used 5-minute epoxy in so many years I forgot.  I just mixed up some 5-minute Zap epoxy.  An hour later I could bend the puddle without cracking.

[Ken Culbertson]

I used Slow Epoxy (Zap 30-minute Z-Poxy) to bond the 3-D printed motor mount from Okie Air (formerly Tom Morris) to maple.  I also put shallow notches with a jigsaw into the maple surface to give some added mechanical bite.  The faster epoxies are more brittle and less strong, I don’t use them anywhere strength is needed.  70 flights to date, no issues

I drill 4 holes (1/8" or so through the mount.  Two on top, two on bottom and plug them with a wooden dowel.  That puppy isn't going anywhere.  You can do the same for a full body but I don't use these for full body opting instead for the "through the firewall" design.

ken