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Arniep;<br><br>We will be testing 5 sets of vanes made from various engineering plastic materials within a couple of weeks. <br><br>The pump is designed to run dry. <p>Bob Kennedy<br><a href=mailto:BobK@tdsdesign.com>BobK@tdsdesign.com</a><br><a href=http://www.tdsdesign.com>Turnkey Design...

Can anybody tell me the definition of Cyclic Modulus? <p>Bob Kennedy<br><a href=mailto:BobK@tdsdesign.com>BobK@tdsdesign.com</a><br><a href=http://www.tdsdesign.com>Turnkey Design Services</a><br>Visit our web site for "How to design a gear pump" tips!

Can anybody tell me the definition of Cyclic Modulus? <p>Bob Kennedy<br><a href=mailto:BobK@tdsdesign.com>BobK@tdsdesign.com</a><br><a href=http://www.tdsdesign.com>Turnkey Design Services</a><br>Visit our web site for "How to design a gear pump" tips!

I know how to calcaulate the required torque.&nbsp;&nbsp;My question is,&nbsp;&nbsp;what friction coefficient should I use? The screw is steel and the nut is bronze. <p>Bob Kennedy<br><a href=mailto:BobK@tdsdesign.com>BobK@tdsdesign.com</a><br><a href=http://www.tdsdesign.com>Turnkey Design...

Does anybody have any friction data for acme screw threads? I have a 1/4-16 double lead screw thread and want to compute the torque required to move the screw.

This is a very low flow rate (.002 gpm).&nbsp;&nbsp;Your leakage at 500 psi will be higher than your delivered flow.&nbsp;&nbsp;Is leakage a concern? <br>Your best bet is a gear or a swash-plate piston pump.&nbsp;&nbsp;Do have any other options besides 316SS for the pumping elements? I would not...

We are designing a rotary vane pump that will be pumping pure oxygen.&nbsp;&nbsp;&nbsp;There is a concern about using carbon based materials from an ignition standpoint.&nbsp;&nbsp;With that in mind we are looking to use non-metallic vanes.&nbsp;&nbsp;The vane material is Torlon 4301 which is...

We are designing a rotary vane pump that will be pumping pure oxygen. There is a concern about using carbon based materials from an ignition standpoint.&nbsp;&nbsp;With that in mind we are looking to use non-metallic vanes.&nbsp;&nbsp;The vane material is Torlon 4301 which is 12% graphite powder...