Joe Gwinn <
joeg...@comcast.net> fired this volley in
news:250620161042383981%joeg...@comcast.net:
> I wouldn't assume defeat without looking. The interfaces of VFDs are
> pretty similar. And they may be using the 0-10 Volt interface with
> polarity, or the like, to command motor speed, as part of the position
> loop.
>
> Joe Gwinn
Joe, the VFD turns out to be no more expensive (at retail) than the more
'generic' ones, and ALSO HAS the more generic interface lines... it's
just that the control for this stupid ShopSabre unit uses the proprietary
methods. I can use this same VFD in a more 'compatible' way when I re-
fit the system.
The ShopSabre folks want $600 MORE for the same VFD! They're crooks.
Besides that, there are all sorts of unprotected ways and linear
bearings, exposed screws without any defense against particulates
contamination -- just all SORTS of _fundamental_design_defects_ which CAN
be cured with careful attention.
Heck, they even mounted the VFD RIGHT IN the chips stream! There's 40
sq. ft. of area under the table, and they put the thing right where chips
fall into it on every job (except, I installed a sheet metal shield over
it to prevent that. When the new one gets here Tuesday, I'm mounting it
on a stand under the table!
So... after "the season" (fireworks, remember?), I'm going to rip this
thing down to bones and re-do the whole affair... probably with Mach3
(just because it's so _available_ and well-used... so a lot of assistance
out there for tuning and tweaks). Ehh... maybe I'll go with LinuxCNC,
but I haven't yet studied the issues enough to be sure.
Lloyd