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HomeAircraftHelicopterMain Discussion › 3D printing Heli blade inserts
12-20-2017 11:44 AM  8 months agoPost 1
Jamovich

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Bangalore, India

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Hi guys

I realized after moving to a FBL head on my eagle 3 the new blade bolts are now 5mm instead of 4. This is a problem as I have a set of perfectly good blades that have 4mm brass blade inserts.

The good news is that the inserts are removable. Would it be possible to safely replace them with inserts made out of for example ABS plastic that is commonly used by a 3D printer? Thanks in advance!

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12-31-2017 10:07 PM  7 months agoPost 2
AirWolfRC

rrProfessor

42½ N, 83½ W

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Plastic inserts in blades for the blade bolt ?
. . . . I don't think so . . . the plastic will get crushed.

They need to be metal, brass most likely.

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01-01-2018 12:09 AM  7 months agoPost 3
getsuyoubi

rrApprentice

Queens, NY - USA

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You can get 5mm inserts here: https://spinblades.com/Spacer-6mm-5mm

I'm not sure though whether that seems like a good idea. These are meant to be inserted into existing brass bushings, instead of drilling a 6mm hole into the blade root.

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01-01-2018 02:45 AM  7 months agoPost 4
ICUR1-2

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Ottawa, Ontario

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Shim with metal not plastic .
Depending on the application you will need a medium of equal hardness to fill the void .

Failure to do so will result in fatigue of the medium .

spending time, paying attention

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01-01-2018 04:36 AM  7 months agoPost 5
R.J.

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SF bay area, CA USA

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What size is the hole in the blade root once you remove the 4mm insert? Usually after you remove the insert, it is a 5mm hole.

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01-01-2018 04:32 PM  7 months agoPost 6
BillK

rrNovice

CA

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If you still have your E3 FB head, simply remove the blade grip bolt inserts and install them in your FBL head. They should be interchangeable.

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01-01-2018 04:37 PM  7 months agoPost 7
Jamovich

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Bangalore, India

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Thanks that’s a good idea but I found someone to make new brass sleeves

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01-01-2018 05:28 PM  7 months agoPost 8
Four Stroker

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Atlanta

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I have made several sets of blade inserts on my toy lathe. Brass is a piece of cake. To get the 5 mm hole centered I use these micro boring bars

https://www.mcmaster.com/#boring-bars/=1axu3yr

Down the page a little - Small-Diameter Solid-Carbide
Boring Lathe Tools

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01-01-2018 05:56 PM  7 months agoPost 9
AirWolfRC

rrProfessor

42½ N, 83½ W

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You could go to the local hobby shop and look for the K & S box with assorted brass tubing. Look for the 5mm tubing and cut to length.

Note, the K&S stuff is .002" over size on the ID to allow one size to fit inside the next size up.

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01-06-2018 04:12 AM  7 months agoPost 10
drdot

rrElite Veteran

So. California, Orange County.

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Hi...

I USED A FATIGUED MEDIUM ONCE, ALL THE GHOSTS WENT TO SLEEP.....

(....sorry....long day...

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