Scarab Roll Gimbal Build Manual

Roll Gimbal
plastic
mallet only
12.5mm
gap
in vice
soft jaw
28.01mm
1.5mm
tool
flush
72-80mm
version 2.0.4 SCARAB Gimbal assembly 14 Feb 2013
SCARAB
Build guide
VERSION 2.0.4
tap
0.5mm gap
on inner sides
flush
20mm
0° degrees
alignment
Assembly - Read document fully first
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-fit on the booms
achieved in this instance by tap-fitting 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 flush 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
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