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HelicopterHIROBOOther › Setting up Push-Pull on EVO 50
01-27-2007 11:01 AM  10 years agoPost 21
Paul Woodcock

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Dubai - United Arab Emirates

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Guys, to be exact, the offset is different for the two servos. The length of the pushrods changes the angle.....

What you need, is the angle to be exactly 90 deg.

Paul

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01-27-2007 05:00 PM  10 years agoPost 22
behemoth

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Gloucestershire - UK

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Hey,

Great to see my thread quoted on this!!

I had the same questions when I built mine 2 months ago and the guys pictures are spot on. It must be as the book or the linkages will ever so slightly bind and load the battery.

I used a thin clear plastic sheet (4cmm inch 13cm) and scribed a line along its middle and one at 90 deg perpendicluar to it at one end.

At the line intersection I drilled a small pilot hole (1.5mm). ON the perpendicular line, I drilled a hole that would fit snuggly on the servo horn screw at the 9.5mm dimension (for that servo).

Screwed the template to the servo (over the top of the servo horn/wheel) and then held the X arm in position with blue tak - (this is only to set the radius about right at the X arm end).

Then the long scribed line is aligned with the relevant X arm ball end and the 1.5mm hole is where hole should be drilled for the ball end on the servo wheel.

Flip the template over for the other hole and repeat for other servos with another servo screw hole at 12.5mm etc in the template)

Job done and all at 90 deg.

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01-28-2007 06:43 PM  10 years agoPost 23
Paul Woodcock

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Dubai - United Arab Emirates

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Hey Behemoth

That is such a cool idea to use plastic. And to flip it over, well brilliant. I would like to have thought of that. No offset.

I wanted to make one out of a bit of ali or steel. I had thought of using a steel ruler or something. but i was too much like hard work, esp to line up the centre, I would have had to cut a slot or something.

I am going to make one with the different holes for the 50 and 90.

Well done dude

Paul

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01-30-2007 01:41 AM  10 years agoPost 24
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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OK now I've done the math (Trig)........

Well my drawing was way off!

For 2 degress, at 9.5mm away from center, the ball would be 0.33mm offset from the normal 90 deg position. I challenge everybody to measure and drill the hole 0.33mm offset!

At 11mm away from center (I believe the other servo horn is supposed to have the ball at 11mm away from center), the offset is not much more at 0.38mm.

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01-30-2007 01:47 AM  10 years agoPost 25
hootowl

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Garnet Valley, Pa.

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We're talking .013" Not worth the effort from my perspective.

Wolves don't lose sleep over the opinions of sheep

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01-30-2007 06:42 PM  10 years agoPost 26
behemoth

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Gloucestershire - UK

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I did mine under high magnification using brand new drill bits turning by hand to keep the center as close as possible through the cross lines on the template so each hole was a visually as central as could be seen with an eye glass. Then used this "inspected" template to drill with when held securely to the servo wheel etc, so although it may be "a few thou" off, it is definitely better than not bothering and having them in a straight line.

Dave

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01-31-2007 05:57 AM  10 years agoPost 27
X34

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Singapore

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Here is how I do mine.

9.5 mm, the offset is 0.9 mm. the drilling guide holes are 1.8 mm. On the Futaba round horns there are sector lines. To get 0.9mm offset. I simply align the edge of the guide hole to the sector line. And do the same for the other side. Make sure the orientation is correct.

For the 11.5 mm the offset is 1.3mm, I align it to the outer edge of the guide hole brass insert.

Hope it helps.

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HelicopterHIROBOOther › Setting up Push-Pull on EVO 50
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