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Author Topic: Printed motor mounts.  (Read 888 times)

Offline Perry Rose

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Printed motor mounts.
« on: October 25, 2023, 06:58:07 AM »
I had one of the legs break at a contest this past weekend, 10/22. The lower leg held things in place, somewhat, until I noticed the break. At home I removed the motor and drilled through the mount portion into the leg and put a screw in to hold it from letting go again. I CyA'd the part also before installing the screw. I drilled and screwed the good leg also. I flew it the next day and it's ready for El Dorado.
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Online Ken Culbertson

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Re: Printed motor mounts.
« Reply #1 on: October 25, 2023, 07:23:00 AM »
Quote from: Perry Rose on October 25, 2023, 06:58:07 AM
I had one of the legs break at a contest this past weekend, 10/22. The lower leg held things in place, somewhat, until I noticed the break. At home I removed the motor and drilled through the mount portion into the leg and put a screw in to hold it from letting go again. I CyA'd the part also before installing the screw. I drilled and screwed the good leg also. I flew it the next day and it's ready for El Dorado.
I had one break in a high speed inverted landing with the motor running.  I fixed it the same way and have had no problems since.
Ken


 
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Offline Paul Taylor

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Re: Printed motor mounts.
« Reply #2 on: November 02, 2023, 05:29:02 PM »
When drilling PLA run the drill motor in reverse and melt through the plastic. If you go forward it rips the layers apart. Melted plastic seals the layers.
Good luck.
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Online Ken Culbertson

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Re: Printed motor mounts.
« Reply #3 on: November 02, 2023, 08:51:29 PM »
Quote from: Paul Taylor on November 02, 2023, 05:29:02 PM
When drilling PLA run the drill motor in reverse and melt through the plastic. If you go forward it rips the layers apart. Melted plastic seals the layers.
Good luck.
Speaking of melting, I have had two of the printed mounts soften with heat from the motor around the hole bushings and stretch loosening the motor.  My solution was to cut a 1mm piece of CF sheet and put it on either side of the printed mount matching the cutouts and bolt holes.  Keeps things in place when it gets soft.  Surgery replacing the canard drive shaft exposed it.  Similar one on the front.

Ken
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Offline Paul Taylor

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Re: Printed motor mounts.
« Reply #4 on: November 09, 2023, 07:22:40 PM »
Quote from: Ken Culbertson on November 02, 2023, 08:51:29 PM
Speaking of melting, I have had two of the printed mounts soften with heat from the motor around the hole bushings and stretch loosening the motor.  My solution was to cut a 1mm piece of CF sheet and put it on either side of the printed mount matching the cutouts and bolt holes.  Keeps things in place when it gets soft.  Surgery replacing the canard drive shaft exposed it.  Similar one on the front.

Ken

The Okie Air mounts are printed with PLA.
There is a more heat resistant material called PETG.
I also use a modified version that uses the aluminum plate mount that comes with every motor. Dissipates heat better and allows for better cooling.
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Paul
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