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

Sorry - I should have used a more round number in that little joke. My
point was that the main thing you sacrifice with smaller motors is rapid
speed (because you have to use a higher reduction ratio to get the
torque, which is required for cutting and accelerating, while
sacrificing high end speed, which is desirable, but not strictly necessary).

- Steve

Jon Elson wrote:

>Stephen Wille Padnos wrote:
>
>
>
>>Hi there.
>>
>>I had considered these for my Bridgeport, but decided against them.
>>They're a little underpowered for a machine that size (unless you don't
>>mind 6 IPM rapids :).
>>
>>
>>
>What are you talking about? I am using 1/8 Hp (continuous) motors,
>which I have
>established a peak torque rating of about 9 In-Lb. I use a 2.5:1 belt
>reduction
>ratio to drive the leadscrew. I get rapid feeds of 120+ IPM on a series I
>Bridgeport. When I DO use these speeds, I invariably end up dodging bits of
>endmills and fixtures as they bounce off the walls, so I now try to keep
>my rapids
>and jog feeds to 60 IPM or less.
>
>
>
>>The 660 is only 176 in-oz continuous (11 in-lb). The motors I
>>eventually found (also from eBay) are from a CNC retrofit for a
>>Bridgeport, and they're 29 in-lb continuous. I checked Anilam's
>>website, and they only sell 31 or 41 in-lb motors for retrofits now.
>>
>>He (clangenf) also sells the E690 motor, which is twice the power - 22
>>in-lb. I think he wanted $40 more per motor for those. That would
>>definitely be worth it, IMO.
>>
>>
>>
>>
>Sure, if the larger motors are available, a little extra never hurts.
>But there's no
>WAY the E660 motor can only deliver 6 IPM!
>
>Jon
>