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Boeing 737 Throttle Quadrant v3

This page is split into three main sections:

Parts Guide

Print Guide

Build Guide

The ultimate printer I can recommend is the Bambu Labs X1 carbon with AMS or P1P if you have deep pockets. ($1200). It's a massive leap forward in 3D printing, with excellent quality and impressive speeds. It's pretty much press print and go as the software and hardware do the calibration before each print. 

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737 SINGLE YOKE HEAD.jpg

This was the 3rd version of the 737 Throttle Quadrant designed for the 3D-printed SIM community. This third iteration is much improved, featuring a stronger, simpler and more cost-effective design. Instead of using a Leo Bodnar board, which can cost up to 25 Euros, an Arduino Micro Pro/Leobodnar interface board costing only 3-6 Euros can now be used. It took several weeks to perfect this design, and I showcased the final product in my YouTube video: https://youtu.be/aNPjT4M89KI

The unit boasts several features, including an operational speed brake lever, dual independent thrust levers, dual independent thrust reverser levers with potentiometers, a flap lever with gated guards, a bell cut-out switch, A/T Disengage switches, TOGO switches, an operational detente brake lever, a working park brake light, operational fuel cutoff levers, operational stab switches x 2, and friction brakes on the main levers.

This unit can be built on the Ender 3 build plate, which has a bed size of 220 x 220mm.

General Information:

Pilot Spanner.jpg

Build Guide

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

0.1

See the YouTube Build Video

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

1

Use a 3.0 TO 3.2 mm drill bit to ensure the ball bearing channel is the correct size and does not interfere with the ball bearing or spring.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

2

Take a black/white Loran rotary switch and remove the white back. Carefully obtain the two ball bearings and spring that fallout. Place the spring into the 3mm channel.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

3

Add the bearing on top of the spring, allow the bearing to sit flush in the channel

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

4

Press the 10K ohm pot into the rear spacer assembly. You may need to file down or remove the locating tang on the pot.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

5

Secure the pot with a nut on the forward side.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

6

Install the reverser arm on to the pot. Ensure the arm is centered on the pot rotational axis.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

7

Push the spring into the unit and compress it into the channel. Once compressed insert the spring plug.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

8

Add the push button into the spacer body, and tighten the nut

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

9

Add an M5 x 16mm countersunk screw. Ensure at this point, the screw doesn't protrude into the channel for the stem.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

10

Insert another push button into the handles. Attach the wires to the unit before insertion. Feed the wires through the cable channel.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

11

Place the throttle handle over the top of the spacer assembly, feed the wires through the channel.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

12

Allow the wires to sit in the channel and ensure the back plate is flush against the spacer.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

13

Completing the wiring install, then add the top plate. Secure with 4 screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

14

Add the thrust reverser knob to the lever. Secure with a screw.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

15

Place the spring into the upper lever assy, secure the upper spring attachment loop with a screw.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

16

Place the handle onto the lever and secure with a screw.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

17

Feed a piece of string around the lower bottom screw. Pull the string through the lower lever. Place the lower lever into the upper lever and secure the lower spring with a screw. Pull the sting out.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

18

Ensure the lever operates smoothly

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STEP:

19

Place the RV24YN B10K pot in to the flap bracket. Secure with locknut

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

20

Place the flap detent bracket on to the throttle body. Secure with screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

21

Feed the flap lever into the gap in the throttle body.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

22

Insert the flap bracket into the throttle body. Ensure the pot shaft goes through the lower flap lever assy. Tighten the screw onto the lower flap stem to tighten the unit onto the shaft.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

23

Secure the flap bracket to throttle body with screws.

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STEP:

24

Place the decal onto the unit and secure with Qty 3 screws

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

25

Place the push button into the throttle body and secure with the supplied lock nut.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

26

Insert the pot in to the throttle base brackets. Secure with supplied lock nut.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

27

Insert the grub screw into the throttle stems. Ensure it does not protrude into the shaft entrance yet.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

28

Place the throttle stems onto the pot shaft, ensuring the Pot is free to move in both directions. If the pot shaft doesnt fit. Drill the internal hole out to the required size. To aid cohesion of the two parts. File a small flat spot on to the shaft of the pot where the grub screw sits. DO NOT OVERTIGHTEN the grub screw.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

29

Before fitting the brake, cover the internal surface with hot glue. Place the brake into position.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

30

Turn the unit over and secure the brake with a screw. Do not overtighten the screw so that the brake starts to bind on the bracket.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

31

Inset the screw, this set the tension of the throttle. I would suggest setting the tension at the end when the unit is fully built.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

32

This is the designed wiring route for the throttle brackets

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

33

Place the cover onto the unit and secure with screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

34

Complete both throttle brackets following the previous steps.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

35

Place the #2 throttle bracket into the unit. Please remember, you must feed the throttle handle wiring into the slot of the throttle body, then through the bracket. As you push the bracket into the unit, Pull the wires through the loom maintenance hole.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

36

Insert the #1 throttle bracket in the same way as described for the #2 throttle bracket.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

37

Place all the screws into the throttle body to the throttle brackets.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

38

Insert the aluminium bars to support the throttle handles

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

39

Place the throttle heads onto the bars. Secure the throttle levers with the screw at the base in the spacer body.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

40

Repeat for the #1 throttle

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

41

Place the speed brake decal onto the unit and secure with screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

43

Place the HQ pot into the LH Body assembly.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

44

Secure with locking nut

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

45

Place the speed brake handle on to the lever with two screws

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

46

Insert the spring into the unit and secure the upper end with a screw.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

47

Place the stem on to the shaft.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

48

Insert the grub screw, Do not overtighten.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

49

Place the lower lever into the upper handle, pull the spring down with cord like the flap unit. Secure with a screw. The unit should slide freely in and out of the unit.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

50

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

51

Place the lever Assy into the stem. Secure with a screw.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

52

Place the spd brk brake into the bracket

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

53

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

54

Place the speed brake bracket on the left hand body assy.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

55

Place the speed brake stop in to position and secure with screws

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

56

Secure the parts with the stated screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

58

Place the microswitch on the brake bracket

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

59

Turn over the unit, and fit a second microswitch

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

60

Place the cap onto the bracket. secure with stated screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

61

Place the brake unit into the left hand body assy

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

62

Fasten with screws

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

63

Insert the brake lever, secure the forward end with a screw

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

64

This step can not be achieved until the Brake assy is in the case. The step demonstrates how the unit is assembled internally. The M3 screw inserts through the activation cap and secures to the brake lever. See Step 64.1

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

65

Place the panel light into the unit. If you have a 12v led light, remove the red cap by unscrewing it, remove the led and resistor unit. Use a resistor suitable for 3 Leds in series with 5v.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

66

Place the decal onto the unit. Secure with super glue.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

67

Place the microswitch into the unit and secure with screws.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

68

Place the lever on to the unit, and secure with screws. Don't overtighten. The lever needs to be free to move

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

69

Place the spring over the two screws. Ensure free movement.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

70

Place and secure the fuel cut-off handles

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

71

Repeat for the #2 side

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

72

Place the decal on to the centre unit and use glue to secure.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

73

Feed the threaded rods through the LH body and the light unit.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

74

Place the #1 cutoff lever on to the unit and continue to feed the threaded rods through the unit

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

75

Repeat with the centre unit body

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

76

Repeat for the #2 cut-off lever

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

77

Place the right and body onto the unit. Feed the 6mm threaded rods all the way through.

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

79

Secure with 6mm nuts

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

80

Secure the opposite end with nuts on the threaded bars

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

81

Place the end cap onto the unit. Secure with screws

737_YOKE_CONTROL_HEAD_single_2020-Oct-31
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STEP:

82

Place the LH end cap and secure with screws.

Build Guide

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Email:           HelenWatersClarke@Hotmail.com

Postal Address:

Karl & Helen Clarke

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TR6 0AP

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