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Comparison Test - DA vs. Rotary vs. Forced DA, Which Burns Thru First? #5420210 05/03/20 07:09 PM
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The Critic Offline OP
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https://www.youtube.com/watch?v=Vyz6P9XeYrw

I thought this was an interesting test and the results were a bit surprising. The DA used in the test looked like a Zentool 21 (similar to a Rupes 21), which is a large-stroke DA with a 21mm orbit. The rotary appears to be a Rupes Rotary set between speeds 2-3 (which should be 800-900 rpm).

If the rotary speed was set higher (1200 rpm), the results may have been a bit different. In my experience, I rarely exceed speed 3.5 (out of 6) on my large-stroke DA for any correction or finishing work; it can deliver results similar to running a rotary at 1200 rpm.

Point is: DA's (forced or large-stroke) are not necessarily safer than a rotary.


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Re: Comparison Test - DA vs. Rotary vs. Forced DA, Which Burns Thru First? [Re: The Critic] #5423446 05/07/20 02:13 PM
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Rotary with foam is very safe......but very hard to master a haze free shine. Hence why DA is so popular.

Short throw however (9mm or less) with foam is very safe. They were using long throw.


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Re: Comparison Test - DA vs. Rotary vs. Forced DA, Which Burns Thru First? [Re: Fordiesel69] #5423450 05/07/20 02:17 PM
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The Critic Offline OP
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Originally Posted by Fordiesel69
Rotary with foam is very safe......but very hard to master a haze free shine. Hence why DA is so popular.


With a polishing or finishing foam pad, yes.

But with a cutting foam pad, you can generate a lot of heat. I am using this Meguiar’s Burgundy foam rotary pad at 1200rpm with TLC and the amount of heat it is generating is shocking. Wool is generally a safer (and more usable) choice for compounding on a rotary, imo.

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