GyroDec blog

Patent pending?

My dc motor is mounted on a metal plate and connected to my Gorbe's acrylic base by a long M6 bolt. I have been looking at cheap ways to separate it from the acrylic by having a freestanding base sitting on the shelf and giving a stable mount for the motor above. It needs to be cheap, easy to fabricate/adapt and look reasonable when done.

My assumption is that the benefit would be from isolating the motor from the Gorbe so no vibration can get to the arm/platter via the bolt as it could now. To check if it will make a difference I may set up a quick test with an old electrical back box with some weights inside sitting on the wooden shelf and attached to a longer bolt to reach the height needed for the motor bracket.

Previously on Hifi Man Shed...

That's worth thinking about and may help under the three spikes/cones of the Gorbe. With the motor I'm probably dealing with horizontal rather than vertical movement. I'm moving from an M6 bolt attached to the base of acrylic box which the original mk 2 motor housing was joined to, to a heavy box (1.5kg) that sits on the wooden shelf below. The practical issue in my ideas today and in practice is to handle any rotational pulsing of the motor and resist the horizontal force pulling the motor box stack across - the belt tension. I decided that sticktion keeping it in place relative to the spindle was more important than friction i.e. energy loss between the base weight and wooden shelf. I think I can absorb any motor vibration within the motor/column/base.

I must post some pictures to make things clearer. There are lots of examples of hanging motors off the turntable chassis or platter or on the supporting shelf but away from the main platter/arm sub-chassis, aimed  to absorb motor vibration whilst ensuring any movement remaining does not alter belt tension and bring wow and flutter to platter speed. I'm just DIY'ing what Michell did with their freestanding motor pod twenty years ago.



Edited by Fatmangolf - 20 May 2017 at 9:48pm

Close up showing how Lead weights and junction box are clamped by vertical bolt leading to the motor. It is a Rega double pulley secured by a little superglue.