Difrrence between PC, orbital and dual-action.?
- Thread starter viper55os
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DrSauekraut
CIXELSYD
the other pc
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imported_Bence
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Where is the dual action orbital with forced rotation? :sign
the other pc
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:wall Dang, I knew leaving that out would come back and bite me!
It's a somewhat harder to draw (the little "spirograph" loops aren't just sections of circles) and I got lazy after finishing the rest. I really do need to go back and add it.
PC.
It's a somewhat harder to draw (the little "spirograph" loops aren't just sections of circles) and I got lazy after finishing the rest. I really do need to go back and add it.
PC.
White95Max
New member
Orbital refers to a motion of wobbling AND spinning, so it's expressed in orbits per minute (OPM) rather than revolutions per minute (RPM).
Dual action is the same thing...it refers to the actions of wobbling and spinning.
The PC is a dual-action orbital polisher.
Dual action is the same thing...it refers to the actions of wobbling and spinning.
The PC is a dual-action orbital polisher.
The orbital just wobbles and is specced in OPM. Used for woodwork and has a very high OPM. Works for paint polishing too.
The dual action both wobbles and spins by use of a weight. You can still stop the spin motion by holding it with your hand. Usually specced in RPM. The PC falls into this category.
Then there is the orbital with forced rotation. It wobbles and spins but you it is difficult to stop the spinning motion by hand. Usually you have specs in both OPM and RPM, plus the forced rotation can be turned off by a switch. Used for woodwork.
The dual action both wobbles and spins by use of a weight. You can still stop the spin motion by holding it with your hand. Usually specced in RPM. The PC falls into this category.
Then there is the orbital with forced rotation. It wobbles and spins but you it is difficult to stop the spinning motion by hand. Usually you have specs in both OPM and RPM, plus the forced rotation can be turned off by a switch. Used for woodwork.
White95Max
New member
aaron33 said:
If an orbital merely wobbled, with no spinning, it wouldn't orbit anything. It would be "wobbles per minute" or something. The moon orbits the Earth. Meaning that it moves in a circular/elliptical orbit around the Earth.
White95Max said:
Wobble per minute = Oscillations per minute = OPM. OPM is not orbits per minute.
Don't ask me why it is called a random orbital. It's just called that. In fact, if it did orbit in the same way like the moon orbits the earth, then it wouldn't be random anymore, right?
Just like a butterfly. It's not made of butter, but it flies.
My Bosch random ordit sander (now equipped with a soft backplate and foam pads) does the orbit thing AND rotates. It's most obvious after you turn it off and the orbit action stops fairly quick, but it takes longer to spin down to a stop. It definitely does both actions whenever it's on.
White95Max
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aaron33 said:Wobble per minute = Oscillations per minute = OPM. OPM is not orbits per minute.
But Porter-Cable states on their website, "Electronic variable speed 2,500-6,000 OPM" for the 7424, and the PC is a dual-action random orbital.
You are correct...OPM does not refer to orbits per minute. My mistake.
Just like a butterfly. It's not made of butter, but it flies.
lol, yes, to my knowledge this is true.
PC is different from a normal random orbital. It has a 6000opm rate because the rotating action also does some cutting.
My regular random orbital goes from 12000 to 25000opm, and even at a setting of 6 out of 10, it does not cut/damage/haze the paint, even with a yellow propel. For paint correction, PCs are better than random orbitals.
My regular random orbital goes from 12000 to 25000opm, and even at a setting of 6 out of 10, it does not cut/damage/haze the paint, even with a yellow propel. For paint correction, PCs are better than random orbitals.
My understanding is similar to Paul's...and not because we share the same name. DA is another way of expressing RO. Both describe a rotating backing plate with an eccentric offset. The reason a PC spins in a manifestly obvious manner is the same reason it cuts better than Aarons 25,000 opm polisher - it has an 8mm diameter throw. This enables it to cut aggressively and spin the pad, even under load. Most orbitals have 3 or at best 5mm orbits. The only other DA/RO polisher with an 8mm throw that I know of is the Flex in Germany - which is allied with Porter Cable and is a PC clone. Even the DeWalt only has a 5mm throw.
imported_Bence
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Paul, correct! (Actually 8.8 mm) The tool which does orbital motions coupled with strict rotation is the twin mode dual orbit sander/polisher such as the Makita BO6040 or the Bosch GEX150 Turbo (it has different name in the States). These machines act like a normal DA, but they can be locked in forced rotation mode, and in this mode the pad oscillates and rotates in the same time. Here the spinning is motor driven and won't stop under load while a normal DA stops and continues to jiggle.
The forced rotation mode is quite slow, @ around 550-750 RPM, but the rotation does more actual cutting, but it will finish as fine as a normal DA.
The forced rotation mode is quite slow, @ around 550-750 RPM, but the rotation does more actual cutting, but it will finish as fine as a normal DA.
imported_Bence
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Yep! :bigups
the other pc
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OPM, orbits per minute, oscillations per minute, po-tay-to, po-tah-to. They mean the same thing and are interchangeable. You see both used commonly.
Orbital means the any given point on the working surface moves in the same arc as any other point on the surface but each around it’s own center point. If you get a rock under your pad it will inscribe little squiggles that are, for all practical purposes, circular.
Dual Action is a particular type of orbital. Each point on the surface is driven move in an arc as any other but the entire surface is free to rotate as well. It is free to rotate but is not forced to rotate. That’s why is can be seen to rotate or stop varying under load.
Dual Action Orbital:
Regular (non-Dual Action) Orbital:
Makita, Bosch and Festo also make dual mode polishers that can operate as normal Dual Action polishers or in a forced orbit polishing mode. (I haven’t gotten around to drawing a diagram of that motion).
Dual Action Orbitals with forced orbit mode:
PC.
Orbital means the any given point on the working surface moves in the same arc as any other point on the surface but each around it’s own center point. If you get a rock under your pad it will inscribe little squiggles that are, for all practical purposes, circular.
Dual Action is a particular type of orbital. Each point on the surface is driven move in an arc as any other but the entire surface is free to rotate as well. It is free to rotate but is not forced to rotate. That’s why is can be seen to rotate or stop varying under load.
Dual Action Orbital:
Regular (non-Dual Action) Orbital:
Makita, Bosch and Festo also make dual mode polishers that can operate as normal Dual Action polishers or in a forced orbit polishing mode. (I haven’t gotten around to drawing a diagram of that motion).
Dual Action Orbitals with forced orbit mode:
PC.