Re: [CAD_CAM_EDM_DRO] Re: z axis drive question

The servo disc motor is a completely different animal. More info here:

http://www.motionvillage.com/products/motors/pancake/servodisc/
design.html

My company uses these with both analog and digital servo circuits. They
are real work horses,
cutting fabric up to 7.5 cm high, and dry hauling up to 1200 ipm. They
run for years with no problem.

One word of caution, don't push or pull on the shaft, or bang on the
motor.

Regards,
JJ

On Wednesday, November 12, 2003, at 09:33 PM, Dave Fisher wrote:

> I can see the calculation gives 0.0005", which I am sure would be fine
> for
> my
> needs, but I can't seem to visualise how the DC servo motor can move
> such a
> SMALL amount - is the motor not governed by its commutators and
> magnetic
> pole
> pieces ?
>
> Dave
> ----- Original Message -----
> From: "turbulatordude" <davemucha@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, November 13, 2003 2:03 AM
> Subject: [CAD_CAM_EDM_DRO] Re: z axis drive question
>
>
>> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dave Fisher" <dave@d...>
>> wrote:
>>> I am in the process of building a Z axis for an X Y table I am
>> converting into
>>> a CNC router. I plan to use Artsoft mach2 software with Rutex
>> servo amps to drive the system.
>>>
>>> Can anyone give me any more info on the following:
>>>
>>> I have a quality 25 mm thick ball nut screw cut to 5 tpi - I have a
>> choice of rotary
>>> encoders from 400 to 2000 steps per rev. I intend to drive the
>> screw
>>> direct from my DC servo motor shaft.
>>>
>>> Not being that familiar with servo systems (the amps haven't
>> arrived yet !) I am concerned
>>> that when I turn the ball screw by hand, a mere fraction of a turn
>> seems to move the ball nut a long way !
>>> Can a DC servo system with my proposed setup resolve enough
>> resolution to move the ball a few thou,
>>> typically for fine, milling depth cuts for finishing etc.
>>>
>>> Any info would be most appreciated
>>>
>>> Rgds
>>>
>>> Dave Fisher
>>>
>>>
>>>
>>> [Non-text portions of this message have been removed]
>>
>>
>> Hi Dave,
>>
>> the simple starting point is that 5 TPI means 0.2" per revolution.
>> An encoder that output 400 points per revolution would resolve that
>> to 0.0005"
>>
>> how fine of a resolution do you want or need ?
>>
>>
>> Dave
>>
>>
>>
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> Moderator: pentam@... indigo_red@... [Moderators]
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach
> it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be
> a sister site to the CCED group, as many of the same members are
> there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
> THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>