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I Hate Allen keys


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Extreme 3D
Extreme 3D


Joined: 27 Sep 2016
Posts: 573
Location: winnipeg

PostPosted: Tue Jan 10, 2017 10:01 pm
PostPost subject: I Hate Allen keys
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I finally had enough of it taking 20 minutes to remove and replace the four Allen head screws every time i needed to remove the blades on my Big Lama co axial. The Allen key would always become so rounded off I would wind up removing the screws with a pair of pliers one 1/2 turn at a time. Frustrating. So today i went out and bought 4 packs of Great Planes 2-56 x 1/2" Socket Head Screws that will fit my 5/64 screw driver. The screws are a little wider and longer than the stock screws so i will have to grind off an 1/8 inch. Maybe there is a better way? The blade grips are plastic and are also a real nuisance to remove. If i had an electric grinder i could just have bought a box of allen keys, when they round off and start slipping. I have never had a 2-56 socket head screw slip or strip. Kevin.
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tombo242
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Joined: 04 Nov 2008
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Wed Jan 11, 2017 6:24 am
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Sounds like you were using cheap 'far east' allen keys there Kevin. I use an allen driver head in my screw driver and have never had a problem. I think the screw sockets would round out first.

Tom.
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Extreme 3D
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PostPosted: Wed Jan 11, 2017 7:40 am
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That's another pit fall I've noticed, soft screws.
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tombo242
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PostPosted: Fri Jan 13, 2017 4:59 am
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Gotta be careful with these small screws Kevin! Sad
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Extreme 3D
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PostPosted: Fri Jan 13, 2017 5:17 am
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IN particular its the prop and blade grip screws. I am now using 2-56 socket head screws.
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tombo242
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Fri Jan 13, 2017 4:55 pm
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The blade grips should NEVER be tight Kevin, if you are stripping screws/tools then that's too tight. If you hold the heli on its side with the blades parallel to the ground and give it a slight jerk; the blades should fall to the same angle. (a few degrees of of vertical.)

This slight flex is needed so that the blades will centralise when spun up, this action is very necessary.

Tom.
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Extreme 3D
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PostPosted: Fri Jan 13, 2017 7:51 pm
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Hi Tom. Thanks for the reminder. I set up my blades as you described, but the issue was the the holes in the plastic blade grips being to small, making the screw very difficult to remove or install without stripping the head or rounding the allen key. Also i have to remove the blades to lift the cabin every time i work on it which is often. These 2-56 screws will make life easier. Kevin.
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tombo242
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Sat Jan 14, 2017 8:56 pm
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I'm all in favour of "what makes life easier" Kevin, I think that I would have enlarged the blade hole slightly though rather than change the bolts.

Tom.
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Extreme 3D
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PostPosted: Sun Jan 15, 2017 11:26 am
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You must have a better allen key than me. I have always found the need to constantly file them. If you ever removed the 2 allen screws from the plastic Big Lama blade grips, you will see. Larger head is better =more torque, less stripping Very Happy
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Burgess
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Joined: 27 Mar 2012
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PostPosted: Sun Jan 15, 2017 3:22 pm
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Kevin the problem might have been the screws are metric and the hex sockets are metric. As your hex driver is 5/64" (imperial) and the socket in the screw head being metric 2.0mm.
5/64 = 1.9844 the fit would be imprecise just enough play for one or the other to round off.


I have four hex L keys supposed to be 1.5mm, however, they range from 1.54, 1.47, 1.46, 1.43.

So I try to select a set of screws all with identical hex sockets and the key with the tightest fit.

Burgess
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tombo242
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PostPosted: Mon Jan 16, 2017 5:29 pm
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Dead right as usual Burgess - I hadn't thought of Imperial verses Metric, seems odd that the States are still using English measurements despite the war of independence!

Tom.
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Burgess
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PostPosted: Mon Jan 16, 2017 9:08 pm
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since the 70s I've been using imperial for one foot upwards but metric of anything less than one foot.
Plywood comes in the metric equivalent of 8x4ft and 4x8ft the first digit direction of the grain, so I'll get an 8'x4'x4mm Smile





Burgess
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