Re: [CAD_CAM_EDM_DRO] Re: Max feedrate of ball screws?

Hi guys;

One solution would be to measure the OD of the threaded end of the ball nut,
and getting an appropriate timing belt pulley, (cog wheel), with an ID a smidge
smaller, and thread it to match the nut. You'd likely want to add a lock nut,
and stake it in several places, or do some sort of lock screw/Woodruf key. Add
a couple bearings on either end and a block with a couple, "ears", to hold the
assembly in place with the screw going through the, "ears". Attach the block
to the moving part, (table or gantry), and all that's left, is affixing the
ends of the screw to something solid, and driving the cog wheel with an
appropriate motor. Using some sort of hollow spindle jahotcho might work, too.

Bill

On Thu Dec 5 03:19:48 2002, dgmachinist, <scsm@...> wrote:

>--- In CAD_CAM_EDM_DRO@y..., "dgmachinist" <scsm@m...> wrote:
>> --- In CAD_CAM_EDM_DRO@y..., "Robert Campbell" <bob@c...> wrote:
>> > Seth,
>> >
>> > The current trend is to go to a rotating nut. The ball screw is
>> then fixed
>> > at both ends. Some machine go up to about 3,000 inches per
>minute.
>> >
>> > Bob Campbell
>>
>>
>> Bob,
>>
>> How in the good lord's name do I make a rotating nut? It's a
>> moving gantry..... Any ideas? Why is it different when the nut
>> rotates? Vibration?
>>
>> > Seth
>
> Guys,
>
> Other than a rotating nut, (which I may end up going with)
>what other method is there to acheive high travel speeds (300+ IPM)
>I really like the idea of a rotating nut, but unless someone has
>already built one and is willing to release the design...
>It looks like it will be a complex engineering progect, and rather
>expensive to machine...
>
>
> Seth

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