Tone Ring Half Assembly¶

• Tone Ring Half Assembly
  • Tools
  • Materials
  • Safety Issues
  • Product
  • Procedure
    • 1. Place Heat-Set Insert
    • 2. Place Initial Magnet
    • 3. Place Remaining Magnets
    • 4. Verify Magnet Placement
    • 5. Fix Cover to Base
    • 6. Verify Fit
  • References

Tools¶

• Holoseat Test Stand
• Magnetic Compass
• Soldering Iron with clean wide flat tip
• Heat proof matt
• Spacer TODO - get dimensions

Materials¶

• Instant/super glue (prefer Loctite Super Glue Ultragel Control)
• (1) 18PTR-01: Snap Fit 18 Pole Tone Ring Base
• (1) 18PTR-02: Snap Fit 18 Pole Tone Ring Cover
• (18) 18PTR-03: N52 3/16" x 3/16" Neodymium Cylinder Magnets
• (1) 18PTR-04: M3 x 0.5 mm Thread Size, 3.8 mm Installed Length Heat-Set Inserts for Plastics
• (2) HS-07: 18-8 Stainless Steel Flanged Button Head Screw, M3 x 0.5 mm Thread Size, 5 mm Long
• (1) HS-08: 49 mm 2mm Hex Tip Key L Wrench with short arm

Note: The final build requires (2) HS-03: 18 Pole Tone Ring Halves as detailed in Step 6.

Safety Issues¶

• Use safety glasses when working with small, high powered magnets to avoid eye injury from flying magnets
• Be sure to maintain physical control of magnets (those being placed and those already placed) to avoid flying magnets

Product¶

HS-03: 18 Pole Tone Ring Half

Procedure¶

1. Place Heat-Set Insert¶

1. Place the 18PTR-01: Snap Fit 18 Pole Tone Ring Base on heat proof mat with the spacer supporting the overhanging tab
   
2. Place 18PTR-04: M3 x 0.5 mm Thread Size, 3.8 mm Installed Length Heat-Set Inserts for Plastics face up into the the hole in the Tone Ring Base (when setting the insert, try press fitting it into place to seat it prior to later steps)
   
   
3. Set Soldering Iron to 350 Celsius and wait for it to reach temperature
4. Use the flat of the soldering iron tip to apply gentle pressure to the Heat-set Insert until it melts into the hole and sits flush. Take care not to twist or shift the insert.

2. Place Initial Magnet¶

1. Select 1 18PTR-03: N52 3/16" x 3/16" Neodymium Cylinder Magnet
2. Find the Magnet's south pole using the magnetic compass (this is the pole which attracts the north/red indicator - see references)
   
3. Align the Base so that the tab is closer to you than the slot
   
4. Apply super glue to the half magnet slot away from you and insert the magnet so that the south pole identified above faces out in the Tone Ring; take care that the Magnet is flat in its slot and hold it in place for 60 seconds
   
5. Wait 15 min

3. Place Remaining Magnets¶

1. Select another magnet and find its polarity by placing it along the outside edge so that it becomes attracted to the previous magnet
   
2. Rotate the magnet from the previous step 180 degrees (so that the pole attracted to the previous magnet is facing out to create a pole pair) and place it in the next slot in the base
   
3. Repeat the previous two steps until the tone ring is fully populated
   

4. Verify Magnet Placement¶

Note: You will need (2) in progress HS-03: 18 Pole Tone Ring Halves for testing

1. Set up the Holoseat Test Stand
   1. Ensure the calibrated sensor is attached to the sensor controller
   2. Ensure the power and USB connections are all configured according to the test stand operating instructions
   3. Join (2) in progress HS-03: 18 Pole Tone Ring Halves onto the tone ring adapter
      
2. Run tone ring test(s)
   
3. Remove the tone ring halves from the tone ring adapter

5. Fix Cover to Base¶

1. Apply super glue to the Base as shown below
   
2. Place 18PTR-02: Snap Fit 18 Pole Tone Ring Cover onto Base
3. Press the Top firmly onto the base for 1 minute
   
4. Wait 1 hour

6. Verify Fit¶

Note: You will need (2) in progress HS-03: 18 Pole Tone Ring Halves which going forward will be considered a complete set

1. Take 2 Tone Ring Halves, insert the tabs from each into the slots of the other, and push until they form a single disc (there may be a click as the exposed magnets seat into the other half)
2. Check the alignment of the screw hole on each half with the Heat-set Insert to verify the HS-07: 18-8 Stainless Steel Flanged Button Head Screw, M3 x 0.5 mm Thread Size, 5 mm Long will set properly
   1. If the alignment is good move on to the next step
      
   2. Otherwise, disassemble the 2 halves and use the soldering iron to correct the alignment (retest fit as necessary)
3. Use the HS-08: 49 mm 2mm Hex Tip Key L Wrench with short arm to screw in the two Screws to complete the tone ring assembly
   1. If the alignment is good the assembly is complete
      
   2. Otherwise, disassemble the 2 halves and use the soldering iron to correct the alignment (retest fit as necessary)

References¶

• What Are Magnetic Poles and How to Identify Them
• Reading a Compass