Experimental Vibration Analysis of a WM280 Lathe

[SillyOldDufferModerator @sillyoldduffer]

Posted by Michael Gilligan on 01/08/2020 09:17:51:

Good to see you progressing with this, Dave … but:

May I suggest that you re-engineer your loudspeaking shaker ?

The actual modification would depend upon the donor loudspeaker, but in essence you should replace the cone with a ‘spider’ … this keeps things nicely linear, and filters-out most of the irrelevant noise.

MichaelG.

.

Hint:

Yes, please do suggest re-engineering the shaker, and thanks for the patent drawing. Deciding how to make the cloverleaf will keep me amused for a while, and as for replacing the cone? Now where's my Stanley Knife…

Hi-Fi Buffs look away. At the moment the speaker is glued directly to the biscuit tin with no consideration of efficiency or acoustics. As a speaker enclosure, nought out of ten.

This is how engineering projects spiral out of control. To find a suitable accelerometer, I have to develop a Vibration Table / Shaker, which is yet more technology I don't understand…

Dave

[Michael GilliganParticipant @michaelgilligan61133]

LDS actually kept the cone in that one … cunningly stifling its Audio output by gluing stuff to it.

**LINK**

https://worldwide.espacenet.com/patent/search?q=pn%3DUS5641910A

MichaelG.

[duncan webster 1Participant @duncanwebster1]

How about a sawtooth wheel driven by a motor with a spike on the tin lid hitting the teeth? I think that's how klaxon's work, that should give you a dominant frequency with lots of noise (literally as well as electrically). I suspect ripsaw teeth are the way to go, but no evidence.

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