SOHC.co.uk Forums > CB750
Speedo damping?
AshimotoK0:
There is a tube attached to the top, fixed bridge of the gauge. The upturned cup with viscous oil in it is attached to the shaft of the gauge and rotates. Therefore,as the cup rotates, there is drag between itself and the fixed tube,caused by the oil, which gives damping to the needle. Just really a classic 'spring & dashpot' damper arrangement but of the rotary variety.
Arch stanton:
Hello Ash.
Thanks for your prompt response.
But there is no tube or upturned cup.
There is only what appears to be a solid cylindrical slug of steel which the needle shaft runs through. They are fixed together.
This is a ND F1 speedo.
AshimotoK0:
--- Quote from: Arch stanton on September 09, 2018, 08:46:10 AM ---Hello Ash.
Thanks for your prompt response.
But there is no tube or upturned cup.
There is only what appears to be a solid cylindrical slug of steel which the needle shaft runs through. They are fixed together.
This is a ND F1 speedo.
--- End quote ---
Kent400 will know ...If not I do have an F1 gauge somewhere I can take look at but I bet the principle will be the same as the earlier gauges.
kent400:
Here is an F1 speedo showing the damper, I'm assuming the face i the same as you have with the km/h marking on the dial face. You can see the aluminium damper, you can see where I drilled it and subsequently re-filled it. The dark spot on it where the hole is sealed.
Arch stanton:
Hello Kent.
Yes that is the same as my Speedo.
But what difference can the oil make if its in a cylinder
That moves with the needle shaft?
If the shaft moved through a fixed cylinder of oil, them there may be some resistance thus damping.
But surely. If the shaft +oil+cylinder all rotate in unison.
Then the result would be the same. Oil or not.
Wouldnt it?
Like i said. Sorry if i appear dense. But i dont get it.
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