RE(OANDP-L)VARIABLE SPEED RESPONSES PART 2

RE(OANDP-L)VARIABLE SPEED RESPONSES PART 2

ANDREW COX

6/10/2001

And this same question applies to vacuums. Why would anyone choose the low
setting on a vacuum? If you are going to expend the energy to vacuum,
wouldn't you want the full power of the suck? :) Good question. I can't
recall the last time I used the low speed on either the trautman or my
vacuum!

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A slower speed is beneficial for grinding some types of thermoplastics.
Less heat build-up and molten material created. Also, buffing the same
material with a felt cone works better at the slower speed
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I have used both variable (in the past) and fixed speed (present) and can
tell you that I like the variable speed a lot more. The adjustable speeds can
save give you more control, and slow down the speed to stop some of the temp.
sensitive plastics from melting. Buffing edges also benefit from slower
speeds. These are my perceived benefits, but I can tell you I am working well
without the added feature.
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I find that the variable speed is very useful when working with softer
plastics hat have a lower melting point. If you are only working with
lamanates I dont think that there is any advantage
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We find that varying the speed on our Cascade Prolines and the Cascade
Dayton allows our technicians to get the best finish on the diverse
materials we use in our devices. Different materials finish better at
different speeds with either the tycro cones or felt cones that we use.
That's what works for us. Hope this helps.
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Perplexing Answer to Your Question:

PP and PE tend to melt when the speed (peripheral velocity) is too high.

This only bothers with polishing.

We just put a variable speed control to use on a German router.
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When using felt cone for finishing copoly or polypro low speed keeps
plastic from melting and sticking.
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Coxy,
Down here in the big city most people have variable speed for ease of
cleaning up plastic. The slow speed generates less heat and makes buffing
plastic (esp low temp) easier
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We have the student's slow the trautman for buffing of polyprop.
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While grinding some of the softer or flexable plastics that we use today, a
lower speed and gentle preasure is less likely to cause the plastic to melt
and can make the job go much faster and have a better finish.
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The need to vary the speed clearly depends on the variety of materials you are working with. I do not vary the speed between polypropylene and the copolymers for example. However, when working with Orthoplast I have found the smoothing process to be much quicker with a slower speed. Kt

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 I agree that one speed works for us. It may be that variable speed is
offered because it is possible and more expensive...