re: hydraulic bed control
Posted by
Elliot Burke
on 2000-07-30 09:37:20 UTC
re the speed of control of valves, their were some loudspeaker horns which
used compressed air and an electrically activated valve. They could be
heard for miles, the point of which was to place the vehicle carrying said
loudspeaker out of small arm range.
Hydraulics is a bit different problem, though.
Elliot
Message: 1
Date: Sat, 29 Jul 2000 18:06:55 CDT
From: "Ejay Hire" <ejayhire@...>
Subject: Re: hydralic bed control
How complicated could these valves be?
You'd need one for each direction of travel (i.e. X+ and X-), but a more
creative person could probably combine the functions into one unit.
A double o-ringed piston moving in a honed cylinder with an input port on
the closed end. The ouput oriices are drilled in line, the more holes you
expose, the quicker the bed moves. The piston could be controlled by a
Stepper motor driving a screw.
There would also need to be a Spring loaded bypass port to prevent
over-pressure when the cylinder was closed. (These are available
comercially, Grainger)
The two units would be Mechanically or software interlocked to prevent both
ports (X+ and X-) open simultaneously.
----Original Message Follows----
From: dave engvall <dengvall@...>
Reply-To: CAD_CAM_EDM_DRO@egroups.com
To: CAD_CAM_EDM_DRO@egroups.com
Subject: Re: [CAD_CAM_EDM_DRO] hydralic bed control
Elliot Burke
HighTide Instruments
used compressed air and an electrically activated valve. They could be
heard for miles, the point of which was to place the vehicle carrying said
loudspeaker out of small arm range.
Hydraulics is a bit different problem, though.
Elliot
Message: 1
Date: Sat, 29 Jul 2000 18:06:55 CDT
From: "Ejay Hire" <ejayhire@...>
Subject: Re: hydralic bed control
How complicated could these valves be?
You'd need one for each direction of travel (i.e. X+ and X-), but a more
creative person could probably combine the functions into one unit.
A double o-ringed piston moving in a honed cylinder with an input port on
the closed end. The ouput oriices are drilled in line, the more holes you
expose, the quicker the bed moves. The piston could be controlled by a
Stepper motor driving a screw.
There would also need to be a Spring loaded bypass port to prevent
over-pressure when the cylinder was closed. (These are available
comercially, Grainger)
The two units would be Mechanically or software interlocked to prevent both
ports (X+ and X-) open simultaneously.
----Original Message Follows----
From: dave engvall <dengvall@...>
Reply-To: CAD_CAM_EDM_DRO@egroups.com
To: CAD_CAM_EDM_DRO@egroups.com
Subject: Re: [CAD_CAM_EDM_DRO] hydralic bed control
Elliot Burke
HighTide Instruments