Re: [CAD_CAM_EDM_DRO] Re: nema 34 motors on BP series 1 conversion

jlsmith269 <jlsmith269@...> wrote:
Ron,
~40 lb/in is ~600 oz/in, if i did the math right....

/// thats 600 oz/in continuous. Mariss calculated them at 2hp with a 2.5 :1 reduction they are delivering 5 hp at the screw. These motors are 4 in dia X 17 inches long. I think what the some Ebay'ers claim for torque is really stretching it.

I am doing a bp convo with amtek 600+ oz in, 40v/14a... and a 2:1 on
the x/y and a 3:1 on the knee... and if it's a problem, i'll be
adding a gas sturt.

good to hear that's about what's done...

if i get 30 IPM, i would be overly pleased... 20 will be happy, 10
will work...

/// I'm not that patient....lol

jeffe


--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers
wrote:

> Hi
>
> Nema 34's on b/port are a bit small. They would probably be ok

for X and Y with some of higher torque. I've looked at alot of
b/port conversions and most of them have Nema 42 29lb/in or greater.

>
> I retrofitted a Bridgeport and here is the basic configuration:

40lb/in DC brush servos on X,Y and Z with US digital E5S-200 encoders
retrofitted rated at 40v/k 2500 Rpm making them 100volt and 13.7 amps
stall torque 29 amps. The Geckos will not handle 100 volts so I'm
running them at a lesser voltage sacrificing a bit of speed but still
have the torque because I can still supply the amperage. Mach 2
software. Sound Logic Mach2 breakout board for interface which makes
it all work together very well. It will easily maintain rapids of 120
ipm on X and Y and 60 ipm rapids on Z as I am driving the knee.

>
> I've been using it for 14 months on a daily basis and have had

zero problems with it. The only complaint I have is chips get in the
keyboard. Now I'm starting to change the wiring a bit so the PC has
to be on before the servo control will start for safety concerns and
I hate to mess with it because it runs perfectly. Never lost a step.

>
>
> Ron
>
> feck123 wrote:
> Hi...was hoping to get some opinions /advice on whether it is worth
> it to use these motors from e-bay-thay are nema 34 mount-or keep
> trying to find some others/bigger ones ?I do not know where to find
> any other reasonably priced motors for my bridgeport cnc
> conversion...also,what would you recommend for the drives? rutex or
> the geckos? IF there is anybody that sells a whole setup that would
> be awesome but ANY help is greatly appreciated!! thanx Mike
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?
> ViewItem&category=71400&item=3841702374&rd=1&ssPageName=WDVW
>
>
>
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