Question for lathe operators

[the_digital_dentist]

Is there an easy way to turn a pair of identical symmetrically crowned pulleys about 3" wide and about 1-1.5" in diameter out of teflon and aluminum?  The crown is small- about 1/16" smaller diameter at the ends of the pulley than at the center.

These barrel shape would be used to keep the rubber belt centered on the pulleys in a Van de Graaff generator.

I am currently 3D printing the pulleys then covering them with metal tape and teflon tape.  The metal tape works OK, but the teflon tape gets torn up after a while.

[Sean Derby]

Just curious... it sounds like you would still be using telfon tape with the machined aluminums drums


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On Thu, 3/15/18, the_digital_dentist <mark.r...@gmail.com> wrote:

Subject: [MakerSpace] Question for lathe operators
To: "milwaukeemakerspace" <milwaukee...@googlegroups.com>
Date: Thursday, March 15, 2018, 8:39 AM

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[Have Blue]

I'd be inclined to stick a mandrel in the Tormach spindle that the raw pulleys can be secured to, then clamp a HSS lathe tool about 6 inches up off the bed.  Coming up with a simple Gcode program to jog the Z and X axes as appropriate should be reasonably straightforward.

[Tom Klein]

Marcus has a turntable with a lathe tool that mounts on the southbend lathe, tom k

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[the_digital_dentist]

Thanks, but an alternative solution has been found (I think).

https://www.ebay.com/itm/PTFE-Teflon-Tape-1-2in-x-33ft-180um-Thick-Adhesive-High-Temp-Fiberglass/142444709997?_trkparms=pageci%3A17e64cb6-287a-11e8-9049-74dbd18008a2%7Cparentrq%3A2acdbb171620aa4759e95ef8ffff1ef6%7Ciid%3A1&_trksid=p2481888.c100675.m4236

[the_digital_dentist]

The idea was to make a solid aluminum pulley and a solid teflon pulley.  Right now I use aluminum tape on one printed pulley and plumber's tape on the other.  The aluminum tape is OK, but the teflon tape tends to get torn up after a while.  The printed ABS or even PLA work, too, but they are not as high on the triboelectric series and teflon, so they don't generate as much current.

The tape I found on ebay has a teflon coating on a fiberglass base with adhesive.  I think it will probably hold up just fine.  We'll see.

[Sean Derby]

Very cool... make away!!

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On Thu, 3/15/18, the_digital_dentist <mark.r...@gmail.com> wrote:

Subject: Re: [MakerSpace] Question for lathe operators
To: "milwaukeemakerspace" <milwaukee...@googlegroups.com>
Date: Thursday, March 15, 2018, 12:28 PM

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