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  1. #11
    Registered Member Merlin's Avatar
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    Re: OPM speed settings for the DA polisher?

    Quote Originally Posted by xuyuan88st View Post
    M105 with a DA will do the job but it's a little finicky to work with. I put a little UC on the pad along with a little M105 and it gets the job done.
    I have found a similar but different combo I use...two dime size drops of D300 with two dime size drops of M105.
    Great cut, much long working time and no drying or mess.

  2. #12
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    Re: OPM speed settings for the DA polisher?

    This post should be a sticky. I was going to use my 5" microfiber system for the first time today. I could not find RPM speed on my 7242.

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    Re: OPM speed settings for the DA polisher?

    (thread bump)
    I've searched, but just can't seem to find a clear definition of "opm", as it relates to the rpm of the machine. What EXACTLY does "opm" mean? My DA, which is a very low end sander (400W, 5mm throw, with a backing plate a bit under 5") from a hardware store, has a no load RPM range of 4500 to 13000. The specs also give the no load "oscillation rate", which is 9000 - 26000, which is obviously exactly double the RPM. So, if we simplify it and assume that the pad is stalled (no free rotation), the whole pad is rotating around the forced-rotation axis at between 4500 to 13000 rpm, and if we consider each semi-circle of these rotations as an "oscillation", is that why it's exactly double?

  4. #14
    Registered Member Joe Dragon's Avatar
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    Re: OPM speed settings for the DA polisher?

    As I recall, OPM means orbits per minute, like RPM means revolutions per minute. I think you're being generous calling your sander a DA; different machines for different uses. Here are some links that may be helpful in discussing speeds:

    http://detailingworld.co.uk/forum/sh....php?p=3012954

    http://www.meguiarsonline.com/forums...0UmxpitS4cp.97

    https://www.autogeekonline.net/forum...problem-5.html

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    Re: OPM speed settings for the DA polisher?

    Thanks Joe. So, what is an "orbit"? Is that one revolution of the pad around the forced rotation spindle?

  6. #16
    Registered Member Merlin's Avatar
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    Re: OPM speed settings for the DA polisher?

    IIRC
    RPM applies to a fixed single rotation direct drive rotary polisher.
    OPM applies to a Dual Action (DA) Polisher. A DA rotates and oscillates.


  7. #17
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    Re: OPM speed settings for the DA polisher?

    Merlin: I'm well aware of that. What exactly does "OPM" mean? I ask again - is the OPM equivalent to the RPM of the motorised spindle? I.e - if a DA is spinning at a rate of 1000 OPM, does that mean that the motorised spindle is rotating at 1000 RPM? (leaving the free spinning spindle out of the discussion at the moment) "RPM" means "rotations per minute" and definitely can be used in the context of a DA, when referring to its motor, which turns a spindle on a fixed axis. (I know it is attached to an off centre backplate which is on a separate free spinning spindle, leaving forced rotation devices out at the moment).

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    Re: OPM speed settings for the DA polisher?

    Quote Originally Posted by me View Post
    Merlin: I'm well aware of that. What exactly does "OPM" mean? I ask again - is the OPM equivalent to the RPM of the motorised spindle? I.e - if a DA is spinning at a rate of 1000 OPM, does that mean that the motorised spindle is rotating at 1000 RPM? (leaving the free spinning spindle out of the discussion at the moment) "RPM" means "rotations per minute" and definitely can be used in the context of a DA, when referring to its motor, which turns a spindle on a fixed axis. (I know it is attached to an off centre backplate which is on a separate free spinning spindle, leaving forced rotation devices out at the moment).
    To answer my own question - YES - that is exactly what an "orbit" is. Quoting from https://www.autogeekonline.net/forum...rformance.html
    If the machine's driveshaft is rotated once, the backing plate shaft will travel around the driveshaft axis once, creating a perfect circular pattern. This motion is referred to as an orbit. Machine manufacturers often refer to operating speeds using "Orbits Per Minute" or an "OPM" rating. Some manufacturers refer to operating speeds using a "Revolutions Per Minute" or "RPM" rating. This is completely accurate, but can cause confusion because this rating is sometimes thought of as referring to the backing plate's rotational speed. Since the backing plate rotates independently of the machine's driveshaft (and does so at a random rate), an RPM rating can be confusing.
    Now I'll move on to the "oscillation". I think it must simply be half of an orbit, though. Each half of the orbit is considered a "stroke" or an "oscillation", and that's why the oscillation rate for my machine is exactly twice the orbit/rpm rate.

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    Re: OPM speed settings for the DA polisher?

    Interestingly, Flex do NOT appear to be using the same definition for an "orbit" as Kevin Brown did in the aforementioned link. Look at the specs for their XFE 7-15:
    https://www.flex-tools.com/en/produc...-15-150-set-2/ (the link to standalone polisher is dead so I've linked to the kit)
    Orbit rate - no load: 2900 - 8600
    No load speed: 1500 - 4500 rpm

    So, assuming that the "no load speed" refers to the speed at which the motor is spinning, Flex's "orbit" appears to be roughly the same as an "oscillation" in the specs for my machine. (which btw is a Bosch PEX 400 AE sander)
    It's interesting how the orbit rate is ALMOST but not quite double the RPM.

    I have contacted Porter Cable to see how they define an "orbit" and shall be contacting Flex as well.

    In Forensic Detailing Channel's review of the Flex, they show a table, comparing it to two other polishers. In that table, the Flex appears to be a standout with regards to OPM rate, however I suspect that Flex's RPM spec should have been used for comparison purposes, not it's OPM speed. Go to time 20:33 here: https://www.youtube.com/watch?v=-uu3xBaTWRg&t=20m33s Elsewhere in that review, I recall them being a bit confused about the Flex's speed - it didn't SEEM to be as fast as the spec suggested. (sorry I can't remember where they made that comment)

    EDIT: Actually this whole issue is being discussed in the comments under that video.

  10. #20
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    Re: OPM speed settings for the DA polisher?

    So what is the recommend speed for the Fles XFE? Around 3-4 is good enough for cutting?

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