Emulator Knock off

from ali-express
this is closest size, should only need the ID enlarged and a slot so it conforms to the tube ID
15 x 25 x 3mm

Description​

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2mm 3mm Thick PTFE Sealing Ring ID 3mm-66mm PTFE O-ring Gaskets OD 8mm-75mm

Feature:
• Used for faucet pipe, hose bolt, valve, or other gardening maintenance or retrofit
• It can prevent the pipe from leaking and provide positive shut off, stop leaks to save energy
• Durable PTFE with wear-resisting, anti-corrosion, strong sealing, and can be insulated
• Hard material, high strength, not easy to damage, not easy to aging;
• Suitable for the temperature of -180℃-300℃ in a variety of corrosive media as gasket seal and lubrication seal, and in a variety of frequency use of electrical insulation materials.

Specification:
• Material: PTFE
• Temperature resistance: -180℃-300℃
• Color: White / Transparent
• Inner diameter: 3mm-66mm
• Outer diameter: 8mm-75mm
• Thicknesses: 2mm 3mm

The package includes: you choose. Select your requirement from the drop-down menu above.
S0dfea11d035b450fb797c9a7273ae6a85.jpg
 
I did miss remember. I put mine back together, to move the bike, and on the road. All my notes are home.

The rod is steel?
No, it's aluminum
The top hat is aluminum with hex nub?
No hex, just a couple flats
The 2 do not separate?
Yes they do - the cap is threaded.
Screws on the DR. Secured with split
pin. The 4 holes in the cap do suggest
fluid travel inside the rod.

IIRC, the damper rod ID is too small to accommodate the emulator lockout and allow oil flow. An adapter is needed to seat the emulator on the rod, and hold the emulator proud of the DR.

Additionally, the OD of Taiwan 35mm versions of the emulator are "tight" in the 34mm tube. Typical clearance is 1-2mm in the 35mm tube. I estimated .12mm.
Not sure how big an issue that is.
Gary could measure when he has time,
I had to estimate with feeler gauges.
 

Attachments

  • 20250104_163854.jpg
    20250104_163854.jpg
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Mine are phenolic, trimmed on a 6" mini lathe for ID and OD.
Soft stuff is really hard to hold dimensions.
Yes, soft plastics at least require really sharp HSS bits, high rpm and moderate cut/ feed rates to machine somewhat ok.
On the RaceTech emulator adapters for the 34 mm RD350 forks, the rings were white, and appeared to be quite soft, so that made me think PTFE
 
I suspect an o-ring will have more stiction than the plastic (?) ring. What about turning the right size on a lathe?
Late to the party so excuse if it's already been said, but any idea what the ring is made from.... nylon?
I’ve been following this thread with interest. Looking at prices, seems like one would save about $190 adapting the Mikes emulators vs Racetech. For me, with limited to no machining capability, I think the extra $200 would be the option for me for me, should I attempt a fork upgrade on my ‘76. That said, right now there are other things that I need to buy on my multi project budget so this mod will have to sit on the back burner.

I’ll be interested to see what the final outcome will be. Thanks to all for your sharing your R&D.
 
I did miss remember. I put mine back together, to move the bike, and on the road. All my notes are home.

The rod is steel?
No, it's aluminum
The top hat is aluminum with hex nub?
No hex, just a couple flats
The 2 do not separate?
Yes they do - the cap is threaded.
Screws on the DR. Secured with split
pin. The 4 holes in the cap do suggest
fluid travel inside the rod.

IIRC, the damper rod ID is too small to accommodate the emulator lockout and allow oil flow. An adapter is needed to seat the emulator on the rod, and hold the emulator proud of the DR.

Additionally, the OD of Taiwan 35mm versions of the emulator are "tight" in the 34mm tube. Typical clearance is 1-2mm in the 35mm tube. I estimated .12mm.
Not sure how big an issue that is.
Gary could measure when he has time,
I had to estimate with feeler gauges.
I did miss remember. I put mine back together, to move the bike, and on the road. All my notes are home.

The rod is steel?
No, it's aluminum
The top hat is aluminum with hex nub?
No hex, just a couple flats
The 2 do not separate?
Yes they do - the cap is threaded.
Screws on the DR. Secured with split
pin. The 4 holes in the cap do suggest
fluid travel inside the rod.

IIRC, the damper rod ID is too small to accommodate the emulator lockout and allow oil flow. An adapter is needed to seat the emulator on the rod, and hold the emulator proud of the DR.

Additionally, the OD of Taiwan 35mm versions of the emulator are "tight" in the 34mm tube. Typical clearance is 1-2mm in the 35mm tube. I estimated .12mm.
Not sure how big an issue that is.
Gary could measure when he has time,
I had to estimate with feeler gauges.
 

Attachments

  • 34YAM.jpg
    34YAM.jpg
    436.4 KB · Views: 18
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