SeaPerch Remotely Operated Vehicle, Руководство по монтажу

Страница: 65 / 110

OPTIONAL PROCEDURE 2.7
– NO-ADHESIVE PROPELLER MOUNTING
SeaPerch ROV Construction Manual
– Version 2010-04NW
2.7-1
Procedure 2.7 – Mount the Propellers Onto the Motors’ Shafts
Tools:
5/64” Drill Bit
Sandpaper (or Steel Wool)
Locking Thin-Nosed Pliers
Materials:
3 Potted Motors
3 Propellers
3 3/8 inch (10 mm) Long,
1/8 inch (3.2 mm) Diam.,
Styrene Plastic Bushings
Paper Towels
Rubbing Alcohol
Figure 2.7-1:
Propeller Mounted on a Motor’s Shaft
NOTE: Various propeller types may be used on SeaPerch ROVs. This vehicle will use
small boat (underwater) propellers. They fit onto the shafts of the thruster motors, as
shown in Figure 2.7-1.
A 1/8” diameter plastic bushing will be used to match the size of
the hole in the propeller to the diameter of the motor shaft. Due to the tight fit of the
bushing and propeller, no adhesive is needed for the propeller to be held onto the shaft.
Construction Steps:
1. Wipe the shafts of each of the three motors using a paper towel and rubbing
alcohol to remove any tape residue, excess wax, or petroleum jelly that may
be left after the potting process.
2. Use a small piece of sandpaper (or steel wool) to roughen the surface of each
of the motor shafts. Then wipe them again with alcohol and a clean paper
towel (not the one used to remove wax above).
3. Use the cutting
end of a 5/64” drill bit, twisting it by hand (do not use a drill motor)
slowly back and forth, to gently ream out the inside of the three plastic bushings.
Ream them from both ends. The drill bit should just emerge from the opposite
end of the bushing when it is reamed sufficiently
. STOP reaming when the bit
first emerges so as not to overly enlarge the inside of the bushing .
IMPORTANT: Some pieces of styrene plastic bushing material may have a large enough
inside diameter to be used without reaming (Step 3) . If the inside diameter of the
bushing is enlarged too much, the propeller may later slip and spin slowly in use, or even
fall off, so it is essential that the bushings be very tight on the motor shafts.
SKIP TO
STEP 4 AND 5 NOW to try pushing a bushing onto a motor shaft without reaming it first. If
it slides on (while being pushed with very firm pressure), continue to Step 6 . IF THE
BUSHING IS TOO TIGHT TO FIT ON, PERFORM STEP 3 BELOW and then continue.