Re: [CAD_CAM_EDM_DRO] Re: Newbie Questions

What is a "prony brake"? I have a pair of servo motors but they do not
seem to provide any resistance with the power off. I want to be able to
use the machine for manual machining as well as CNC...

--C.S.

>The caveat on using a ballscrew feed in a manual mill is
>because the ballscrew provides virtually no friction,
>compared to an acme screw feed. You'd want a small prony
>brake, or some kind of damper to keep the table from moving
>when you took your hand off the crank. Best bet is to
>couple the ballscrews to either a servo or stepper (in that
>order of preference) as they would effectively hold
>position at the end of each move, assuming that they are
>controlled by a CNC system.
>
>RayHex
>
>----------
>> From: C.S. Mo <cs@...>
>>
>> To bring back a question that has been recently discussed
>with Ballscrews
>> but not Acme rod..
>>
>> I have roughly .015" backlash in my X and Y travels. I've
>heard talk
>> about "double-nutting" in order to reduce backlash. Has
>anyone done this
>> to one of the little Mill/Drills? Any advice on how to go
>about doing it?
>> I've considered going to ball screws but my
>understanding is that ball
>> screws make it so that the machine can not be used for
>manual milling -
>> is that correct?
>
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