Re: nema 34 motors on BP series 1 conversion

You need to consider more than just the torque rating of the motor.
Most of the Bridgeport conversions are designed to use the existing
pulleys from the old stepper motors. These were usually 1:1 or 2:1 on
the BOSS 6. What you really need to consider is the continuous HP of
the motor in conjunction with the feasability of proper gear
reduction for the operating range required of the machine. You should
also take into account the performance goal and other machine
attributes such as lead screw efficiency, etc. in deciding what is
necessary.

~petev
--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
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 <feck123@a...> 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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