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

Jon Elson <elson@...> wrote:
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
>
>
>
>

Bigger??? You mean 110 In-Lb (1760 In-Oz) is not enough?

/// Where did 110 in/lb come from? I read the ad and it is misleading. The motors are listed for 5 amps continuous. Then it goes on to report what they would do at 10 amps. My pickups' speedometer goes to 100 mph, the salesman never mentioned how it handled at 200. Some of these ads that sell these motors like to throw the big torque stats around. What some dont say is if taken to the required amperage to achieve the claimed torque they'd be a pile of ashes at the ends of your leads. One cannot design and intend to use a servo at stall torque or above. They are rated at 65v/k rpm and a speed rating of 1750 which means on a Gecko the motor will turn just a bit over 1000 rpm. with a 5:1 screw and a 2.5:1 reduction that is still about 80 ipm. Which is plenty. Who knows about the torque? Thats why accurate torque ratings should be listed then we would have real numbers to work with. I've looked at these motors for a future project and the claims make me leary.

Ron

////

Are you intending
to use the machine as a sideways arbor press? I think you can buckle your
leadscrews with this motor! Do you really apply 36 Lbs of force on the
handles on your machine when cutting? If so, use a 2:1 or 3:1 belt
reduction
drive and you can't possibly not have enough torque.

Jon



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