Re: [CAD_CAM_EDM_DRO] Re: Is it possible to change the BP motor to eliminate shifting?

I use Flo-Tork units for Railway Applications (about 350 to date without
a failure) and have use the same setup to shift speed and direction on
Oil-Gear Hydraulic Units where speed and direction is controlled by a
rotary spool valve.

I would recommend looking at using the end proximity switches to
indicate when a shift is complete. If the proximity's are monitored by a
simple relay setup so that the run forward and run reverse inputs of the
VFD are inhibited whenever both proxies are low this should not allow
the motor to be started with an incomplete shift. The same relays could
be allowed to send a jog forward or jog reverse to the VFD until the
shift is complete. This is a "jog and rake" type shift but using a very
low jog preset on the VFD should minimize the rake.

You might look at:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=78187&item=7507207538&rd=1

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=78187&item=7506594396&rd=1

gary

Keith Clark wrote:

>Gary, I Googled and found below info at http://www.agi-
>automation.com/Rotary-Actuator-agr1.htm This has great
>possibilities with computer control of airflow. Any idea how that
>might be done? Thanks Keith
>
> Built-in adjustable hardstops on output flange stop against a dowel
>pin embedded in the body to prevent pinion breakage and give
>accurate specific rotation requirements.
>
> Two large bearings, one on either side of the pinion, provide for
>steady output flange with high loading capacity.
>
> Ultra high torque-to-weight ratio for faster cycle times.
>
> Compact body design to fit in tight space applications.
>
> Units are permanently lubricated for non-lube air operation,
>allowing for compliance with OSHA regulations.
>
> All rotary units have zero backlash at either end of rotation,
>keeping the output flange against the hardstop.
>
> Built-in adjustable flow controls allow for maximum cycle times and
>smooth deceleration.
>
> Proximity switches are available to monitor end of rotation.
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, gary <garyclick1@c...> wrote:
>
>
>>Excuse my $0.02 worth but a Rotary Actuator will index exactly 180
>>
>>
>Deg.
>
>
>>when energized. While most are very powerful the force may be
>>
>>
>reduced by
>
>
>>lowering the air pressure. I use these in several applications
>>
>>
>requiring
>
>
>>rotary motion.
>>
>>gary
>>
>>Keith Clark wrote:
>>
>>
>>
>>>Thanks Jon, I am installing a VFD and would like to figure out
>>>
>>>
>how to
>
>
>>>use pneumatic cylinders to shift. Do you know of this being done
>>>
>>>
>on
>
>
>>>the BP since the shift requires a 180 degree throw of the lever?
>>>
>>>
>I
>
>
>>>think someone suggested using a stepper motor to turn the shift...
>>>
>>>Keith
>>>
>>>
>>>
>>>
>>>
>>>>If you have a VFD, use the "jog" function and pneumatic
>>>>
>>>>
>cylinders to
>
>
>>>>operate the shift handle.
>>>>I use a VFD on my lathe, and the VFD's jog function works great
>>>>
>>>>
>for
>
>
>>>>shifting.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>Jon
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
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>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.
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