Record clamp/weight and turntable speed


Hey all. So today I thought for the first time if having a substantial weight or clamp on the spindle affects the platter rotation speed. It doesn't for me, as far as I can tell, but if not, why would that be so?
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Because all turntables are designed to run at a set constant speed. Adding mass to the platter will cause it to take longer to accelerate up to speed, but will not cause that speed to be lower.
Thank you both for your answers, topical and metaphorical both. they both help out, especially the one about the turntable platter getting up to speed, no matter what the weight.