Re: [CAD_CAM_EDM_DRO] servo vs stepper

Hi Keith

I have not been following this thread that closely but having done a fair
number of retros including series I and series II BP's I would encourage
you to hang in there a little longer before giving up or scrapping what you
have and going with servos. I spent a lot of time (being as how I had time
but no $$) playing with steppers before I got a good handle on them.

I think the geckos should work very well. Just a couple of other
thoughts/questions that may have already been mentioned but here goes-are
you using ball screws? How much friction in your ways, are you getting good
lube flow? I see you mention that your motors are high-inductance,
generally that's not that desirable it probably would be better to rewire.
How is the motor coupled to the leadscrew? My series I used lovejoy
couplings with rubber inserts and I think it helped quite a bit. Had to
change the rubber twice a year or so.

The learning curve can be frustrating but having the CNC is worth the
effort.

Bob

----- Original Message -----
From: "Keith Clark" <mail@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 02, 2004 6:47 AM
Subject: [CAD_CAM_EDM_DRO] servo vs stepper


> As many have read, I have been having a bad time making stepper
> motors work using Gecko drives. Several have recommended switching
> to servos but I have been fearful of tuning the motors etc. Is it
> really that difficult and that much more expensive? At this point I
> have spent $550 on each motor. I am also concerned about the
> difficulty of selecting the correct servo motors since I have had so
> much trouble with the stepper motors. I guess I would appreciate
> some encouragement or discouragement at this point especially from
> those of you that have done it with a Bridgeport. My machine is a
> Boss 6 Bridgeport.
>
> Thanks
> Keith Clark
>
>
>
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