Tech Model Products L.L.C. •800 Village Walk # 172 •Guilford CT 06437 •www.techmodelproducts.com
Rev B 4/03/10
1. Front Frame - Assembly
Parts: Qty: Description:
TW-100-L 1 Front left main frame side plate
TW-100-R 1 Front right main frame side plate
TW-108 2 Main shaft bearing blocks
TW-109 1 Driveshaft bearing block w/M2x6 mounting screw
TW-111 1 Anti-rotation bracket w/screws (Align 1082 or 1236 modified)
TW-500 2 Main shaft bearings - 5x11x5mm (T-HS1028)
TW-501 1 One-way bearing - HFO-612 (T-HS1229) - Assembled into main gear
TW-502 1 Driveshaft block bearing - 5x10x4 flanged
TW-301 1 Miter gear
TW-302 1 Miter gear aluminum sleeve
TW-304 1 Front main shaft
TW-305 1 Main shaft locking collar w/setscrew.
TW-306 1 Main drive gear (Align 1057 or 1218)
TW-307 1 Front main shaft ring (T-HB6003)
TW-308 1 Front one-way shaft (Align HZ026)
TW-311 1 M2x20 SH SS Miter gear mounting screw w/M2 locknut
TW-312 1 M2x10 SH Main gear mounting screw w/M2 locknut
TW-200-1 4 M2.5 x 20mm frame spacer
TW-200-2 8 M2.5 x 5 slotted screw
TW-200-5 6 M2.5 x 30 slotted screw
TW-200-6 11 M2.5 SS washer
TW-200-7 5 M2.5 locknut
1. Attach the four frame spacers to the front right frame side (TW-100-R) with four M2.5 x 5 screws. Use
thread locker. See Figure 1a.
2. Attach the front left frame side (TW-100-L) to the right side assembly with four M2.5 x 5 screws. Use
thread locker. See Figure 1b.
3. Add the two main shaft bearing blocks (TW-108) with four M2.5 x 30 slotted screws. The bearings
face outwards (top bearing faces up and bottom bearing faces down). Use three M2.5 locknuts and
six M2.5 washers. Be sure the bearing blocks are parallel to the top of the frame sides and to each
other. Leave the bottom block rear screw without a nut and washers for now. Insert the two bearings
(TW-500). See Figure 1c.
The top front block screw must be trimmed so approximately 1mm of threads extend past the locknut.
This is for clearance with the servo linkage . See Figure 1d.
4. Add the driveshaft bearing block (TW-109) with two M2.5 x 30 slotted screws. The bearing faces
towards the front. Use two M2.5 locknuts and four M2.5 washers.
Secure the bearing (TW-502) with the M2x6 machine screw. Apply some thin CA to the threads to
lock into place.
5. Slide the miter gear aluminum sleeve (TW-302) into the miter gear (TW-301) so the mounting holes
line up. Insert the M2x20 mounting screw to keep them aligned. Apply a small amount of thin CA to
lock them together. Allow to cure. Keep the M2x20 mounting screw in place without the nut for now.
6. Slide the front main shaft (TW-304) through the top bearing and through miter gear/sleeve assembly.
The gear teeth face downward. Continue sliding the shaft through the bottom bearing, through the
shaft ring (TW-307), and finally through the main gear/one-way assembly (TW-306, TW-308, TW-
501). Attach the main gear to the shaft with the M2x10 screw and locknut. Be sure the inside of the
shaft ring is sitting on the outside of the one-way shaft.
Leave the miter gear unfastened for now. The screw will be added after the rotors timing is set.
