On 2010-08-21, Gunner Asch wrote:
On 21 Aug 2010 04:40:38 GMT, "DoN. Nichols"
wrote:
On 2010-08-21, Gunner Asch wrote:
[ ... ]
My OmniTurn lathes will cut at 300 ipm, but few materials allow that at
4000 rpm
Hmm ... that works out to 0.075" per revolution. Perhaps
cutting machinable wax -- if it won't blow up at 4000 RPM?
Enjoy,
DoN.
Actually..Ive seen it done with cyrolac and delrin and I think...filled
nylon.
The boys were using a nice .50 half round Microcentric carbide cutter.
Wierdest thing Ive ever seen. BANG and the part was done. They claimed
that anything else..and tolerences went to **** because the parts tended
to spring. They were cutting pullies for rescue gear.
:-)
I've made a pair of Delrin pullies -- black, because I made them
to be used out exposed to the sun's UV full time -- but the tolerances
were not that critical. I happened to have an insert cutter with round
inserts on the lathe which worked out well. These were for the setup to
allow me to lay down the pole for my weather station from the ground
when I needed to change batteries (RF link to the station).
Everything is either Delrin or PVC except for a few setscrews so
there is not a path to make it attractive to lightning.
In the past week we got a rather extreme amount of rain. Take
a look at:
http://www.d-and-d.com/Weather/weather-report-classic.html
and scroll down to the bottom where the hourly rainfall shows up for the
past seven days. Actually got about 5.45" of rain in the middle of the
night (Perhaps around 3:00 AM or so -- maybe as late as 5:00 AM.
Totally overflowed the "test tube" gauges up a ways. I had to spend
some time playing with the scale factor before I could see how much rain
actually arrived. :-)
I nodded politey and backed out of the door, with my hand over my wallet
and the other one hovering above my backup......
Perhaps they would like to use the backup for putting the hole
through the pulleys? :-)
Enjoy,
DoN.
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