Scarab Roll Gimbal User manual

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version 2.0.4 SCARAB Gimbal assembly 14 Feb 2013 www.MultiCopterPilot.com
SCARAB
Roll Gimbal
Build guide VERSION 2.0.4
Assembly - Read document fully rst
1. Check the boom/shaft is within tolerance
12.00-12.08mmCarbonF ; 12.00-12.15 Aluminium
2. The bearing are held in place by press-t on the booms
achieved in this instance by tap-tting with soft impact.
they can also be removed this way.
3. Place the circular collar (red ring ) onto the shaft and
Use a 1.5mm hex driver - secure with 4 M3*3 grub
screws using loctite - only a small force is required for
the grub screws to be effective. Overtightening the grub
screws will damage the shaft.
4. The two bearings are now tapped onto the 12.00mm
Ø shaft with a plastic-mallet (left). Be sure to position
the bearings in a softjaw aluminium vice with a gap of
12.50mm to support the inner race of the bearing. Tap
lightly with the plastic hammer.
5. Separate the bearings by 28.01mm measured on the
inside gap between the two bearing
6. Slide the pitch-change-collar arm over the shaft - do
NOT secure yet.This is important because when the
SCARABGoPro mount (or the tray mount) is inserted
inside the shaft the grub screws effectively bite down
on this part. If these screws are tightened to early - the
insert will not go inside later :(
7. Place the shaft assembly into one of the boom-holder
halves and check the alignment (below left) - it’s
important to understand that the bearing are ultimately
held in place by compression of the two halves pressing
down vertically on the outer bearing races ush with
the ends of the casing - the inner race of the bearings
must NOT touch the innersides of the bearings. There
should be a 0.5mm gap on each inside face.
8. The minimum distance of the Pivot mount for GoPro is
20mm to allow the goPro to be tilted up to 5° degrees
downward and still clear the servo arm at full roll.A
longer arm can be used but will effect CofG.
9. Align the pitch-change-collar at 0° degrees to vertical
and secure with 4 grub screws. The grubscrews will
effectly lock the c pitch-change-collar/boom/insert
together in the 0° position and hold it there
10. Link-Rod - Assemble the link rod - always push ball ends
plastic
mallet only
28.01mm
1.5mm
tool
ush
ush
0.5mm gap
on inner sides
20mm
72-80mm 0° degrees
alignment
12.5mm
gap
in vice
soft jaw
tap

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version 2.0.4 SCARAB Gimbal assembly 14 Feb 2013 www.MultiCopterPilot.com
thru the open side - marked with a small ring/
ridge on the black plastic. Use ball link pliers
(Align K10338A)
11. Screw the two ends together until the gap is
approx 13mm. Take care not to damage the rod
ends. Use your hands/ngers to install.
12. Screw one ball into the outer hole of the Red
collar arm
13. There are three tray sizes - 23mmL ; 26mmL
and 29mmL which can be ordered for the
gimbal to suit various common servos.
14. The suplied servo uses the 26mmL CF plate
15. Servo - trim the servo ange with side cutters
to allow the pan heads to sit ush to the servo.
Bolt the Servo to the plate with 2 screws and
2 washers/nuts M3. Orientate the servo as
shown. so the pivot is furtherest away from the
boom
16. Screw one of the ball ends into the centre hole
(drill 1.5mm) of servo arm from the bottom
side
17. Use a servo tester to set the servo to mid
point 1500uSec and attach the servo arm so it
sits at 90° when at Rc Tx/Rx midpoint of 1500
uSecs - all angles should be 90°
18. Tighten down the top half of the gimbal main
assembly (temporarily) with 2 M2*6 screws
- then attach the servo plate to the assembly
with 2 M3 screws. Remove the M2 screws now.
19. Add a servo extension lead now if necessary
to reach your PARIS Cm2 pin. Complete the
remainer of mid deck electronics steps for
SCARAB - then close the two main frames
20. MultiwiiCopter Software 1.9 - In the GUI
activate the three boxes for CAMSTAB (below)
and press WRITE. In the Arduino code (below-
left) uncomment # dene servo tilt - set TILT_
ROLL_PROP to 20 (left).A setting of 16->22 is
usually OK. 16 for smoother centre.
21. There should be no play in the linkage drive
train - if assembled correctly. With the rod-link
OFF - check the gimbal for smooth movement
- the two red collars must be ush. The Servo
must NOT collide with anything at full travel -
use a servo tester to check clearances.
22. Balance all props dynamically - wishing a prop is
balanced just wont cut the mustard - you HAVE
to balance it for smooth video !!!
open side closed side
18.
16.
09.
09. 10.
15.
15.
17.
overlap
90° degrees
alignment at
1500uSec
arduino code to activate PARIS
40mm