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RE: VPI SDS or This?

Mark-

Thanks for the kind words. I've followed some of your threads for quite some time and have always admired your depth of knowledge.

FWIW, I originally did a dual phase output version of the Falcon, but because of the small size, I couldn't dissipate the heat. The other problem for a commercial offering (as you noted) is cabling and having to modify the motor wiring. Also raises some compliance issues. It is an interesting design for DIYers but I saw too many headaches with a commercial version.

I also noted that reducing the voltage output once the platter was up to speed had more of an effect on reducing vibration than phase adjustment did (the Falcon does the voltage reduction after ~3 sec). Also, the standard output is 60Hz for 33.3 RPM and 81 Hz for 45. Most of the other offerings run 60Hz for 45 RPM and 44.4444Hz for 33.3 RPM, but the motors really cog alot more at 44 Hz. So running the motors at the higher RPM also reduces vibration and at 33.3 RPM, the phase cap is still correct (60Hz).

This is all front panel selectable on the Falcon (you can run 44.4Hz/60Hz if you want to) as you can select 50/60Hz and Small/Large spindle to match your pulley arrangement.

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  • RE: VPI SDS or This? - phoenixengr 05/14/1414:06:40 05/14/14 (3)
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