Flex 3401 vs. Festool RO 150FAQ anyone use both?

[Tru_Shine]

Wow! I wanted a Festool but now i'm kinda leaning to that makita BO6040

 

[Accumulator]

Now this is why I read threads here, great info and civil discussion..

Yeah, +1 :xyxthumbs



While I'm happy with my Flex 3401, I'm finding this discussion quite interesting.

 

[Tru_Shine]

I like my flex too. I'm just not a fan of the counter clockwise spin. It sometimes is a little tricky

 

[Todd@RUPES]

Your illustrations don't take into account the way the different machines achieve forced rotation. I'd agree if they both got there the same way, but when the outside edge of the pad is moving with the direction of movement there is more net movement at any give rpm. One direction, with forced rotation achieved by planetary gears adds movement while forced movement by interfacing with the backing plate adds less. Put them side by side and you'll see exactly what I'm talking about. The outside edge on the flex doesn't make full circles.

I agree with you that a similar direction orbit and rotation will produce (by a slight margin) a higher movement speed at the outer edge of the orbit/rotation when they are traveling in the same direction, but this is negated by the fact that on the opposite end (when they are traveling in opposing directions) the pad is moving the slowest.



On a machine such as the Flex, the rotation and oscillation are opposite, the outer edge of the pad will never reach the total speed of the former design, but it also never slows down as much.



As far as their being more net movement, this is not the case. If you take a 5/16th stroke and apply it (in either direction) 10x's per revolution the distance traveled is identical per RPM. As it relates to the direction of the rotation, the same direction orbit will reach a higher speed (for a few degrees per orbit) but will also walk backwards (away from the orbit) so that the speed is negative. If you plotted a point the same distance out on a fixed orbit da and charted the distance traveled with a string, you would get an identical distance traveled.



As far as putting them side by side, I understand your point and I agree, but you have to remember that an orbit is 360 degrees, so while the same direction will achieve a higher velocity for a few degrees, it also travels much slower (or backwards) on the other side of the orbit.

All this being said, I have no doubt other detailers are getting good, even great results using methods and materials different from mine. I've seen their work, (Hey Barry, Kevin, Eric etc.) So, for me, what this is about is just letting people know what I've figured out and to check my work and to learn from people who's experience is different from mine.



Robert

Truer words have never been spoken! :2thumbs:



I have worked with some very high quality, amazingly skilled detailers who achieve awesome results, and each has their own unique methods that work for them. The end result is the goal, but I enjoy the theoretical discussions that have little net effect on overall performance.

 

[Tru_Shine]

WOW! what a detailing Scientist! Nice Intel! Now I'm really lost! I'll just stick with my Flex or sell it and get a B06040.

 

[Junebug]

The main thing the BO6040 has over the Flex is the ability to do DA or just RO at the turn of a button. This feature alone is worth considering if anybody is on the fence. The Makita on-line store has a good deal, around 300 bucks with free shipping and a plastic case. I might have to let the PC or PCXP go and get a Makita, maybe get one and then decide, whatever!

 

[admac]

The Makita's a nice machine. I got one a long time ago and I enjoy it but honestly don't do much detailing on my family cars anymore (new kid). In any case, when the Makita came out I think the Festool came out shortly afterwards. For some reason everyone sort of latched onto the Festool as the better alternative even though I never really understood why, maybe just because Festool is a very good tool manufacturer and Makita is a little more consumer-oriented. The net of it was that people stopped talking about the Makita altogether and when the Flex came out everyone really only talked about the Festool and the Flex.

 

[imported_WhyteWizard]

Here are the specs for your comparison:



Flex XC 3401 VRG

Max. polishing pad diameter: 150 mm

Velcro pad: 6 in.

Speed without load:160-480 rpm

Power input: 900 Watts

Power output: 590 Watt

Orbit: 8 mm

Orbit Rate without load:3200-9600 rpm

Weight: 5.75 lbs.







Makita BO6040

Orbits per minute 1,600 - 5,800

No Load OPM 180 - 670

Orbit Diameter 7/32" 5.5563mm

AMPS 6.6

Size(L x W x H) 12-1/2" x 5-7/8" x 5-3/16"

Net Weight (lbs.) 5.9





You can see the Flex has a larger diameter orbit by 1.45mm and



The orbit on the flex accounts for 261888 mm of travel per minute at the center but uses part of that travel to force the rotation, while the orbits on the Makita account for 100166 mm of travel per minute and go in the direction of the rotation which is forced by the use of planetary gears.



The rpss of the Makita accounts for 315570 mm of travel while the rpms of the Flex accounts for 226080 mm of travel.



The Makita loses in number of orbits by 4100, but those orbits go in the direction of the spin, which results in the edge of the pad traveling in a curlicue pattern.



The spin with the Flex is, again achieved by interfacing the pad with the housing and results in the edge of the pad traveling in a scalloped pattern, with the travel coming to a stop at the edge directly in line with the spindle and the housing at when the two are closest.



The Makita creates a lot more movement between the pad and the paint. The proof is in the heat generated when the two are run side by side with pad, pressure, product and paint held constant. The result was/is the Makita by a good margin. The difference is that the two motions orbit and rotation are added together with the Makita but one contributes to the other, rotation drives - therefore subtracts - on the Flex.





I'm going to get a friend of mine to bring his Flex over to the shop and we'll put a grease pen or something in the pads and run the machines against a surface to show the movement between the pad and the paint and then I'll post the pictures.







Robert

 

[Todd@RUPES]

The orbit on the flex accounts for 261888 mm of travel per minute at the center but uses part of that travel to force the rotation, while the orbits on the Makita account for 100166 mm of travel per minute and go in the direction of the rotation which is forced by the use of planetary gears.

To achieve the numbers you did, I assume you took the throw x pie x maximum OPM. The problem is that the Flex only achieves a maximum unloaded OPM of 4800, not the advertised 9600. This (not pad direction which is irrelevant when we discuss 360 degrees of movement) is likely why you have found the Makita to generate more power.



At a maximum speed of 4800 (10 orbits fixed per 1 revolution at a throw of 7.9375 mm) (7.9375 x 3.14 x 4800) would move a point on the pad about 119,634 mm per minute on the Flex.



At a maximum speed of 5800 (8.66 orbits fixed per 1 revolution at a throw of 5.563 mm) (5.5563 x 3.14 x 5800) would move a point on the pad about 101,191 mm per minute on the Makita.



At this point the Flex is producing more orbital movement in a given minute with out accounting for the additional movement provided by the rotation of the pad. The Makita produces only 84 as much movement.

The rpss of the Makita accounts for 315570 mm of travel while the rpms of the Flex accounts for 226080 mm of travel.

I am not sure how you achieve these numbers, as calculating the distance covered by the revolution requires knowing the distance covered during each revolution, which is dependant on pad size.



With out accounting for RPM’s, the Flex is in the lead. However the Makita has almost 40% more RPM, which gives the Makita more total movement by about 24% for a given time.

(40%-16%).

The Makita loses in number of orbits by 4100, but those orbits go in the direction of the spin, which results in the edge of the pad traveling in a curlicue pattern.

The direction of a 360 orbit has nothing to do with it. The Makita, by virtue of spinning faster (670 RPM vs. 480 RPM) moves the pad further on the paint per minute, even though it doesn’t move it as far per rotation.



At the edge of both machines produce a similar but inverse pattern.

The spin with the Flex is, again achieved by interfacing the pad with the housing and results in the edge of the pad traveling in a scalloped pattern, with the travel coming to a stop at the edge directly in line with the spindle and the housing at when the two are closest.

Correct. But it makes no difference because the total distance traveled is identical as illustrated in my rather terrible (scale) diagram below.

The Makita creates a lot more movement between the pad and the paint.

Yes it creates more movement at maximum RPM because it spins faster.

The proof is in the heat generated when the two are run side by side with pad, pressure, product and paint held constant. The result was/is the Makita by a good margin.

Bog aside (assuming both machines are able to overcome the friction between the pad and paint) the Makita should generate roughly 24% more corrective potential at full speed.

The difference is that the two motions orbit and rotation are added together with the Makita but one contributes to the other, rotation drives - therefore subtracts - on the Flex.

Because an orbit is 360 degrees both directions spend an equal time moving against the pad’s rotation and with the pad’s rotation.



I do agree that the drive system on the Flex takes more power to operate then the efficient planetary gears on the Makita (not to mention centripetal force will actual want to spin the pad in the same direction as the orbit) but much like race car, the amount of power used to drive the movement doesn’t matter, the amount of power that reaches the rear wheels does.



The Flex is a very hard machine to bog, even with an inefficient drive system, because it is so powerful. It’s like horsepower measured at the wheel, if you have enough to hit redline in top gear, more will not make you faster.



I would assume that the Makita (because of it’s more efficient direction that works with centrifugal force and gearing) is pretty bog resistant as well, although likely not as much as the Flex.



I love discussions such as this and appreciate anybody who takes the amount of time to think of such *trivial* things like I do. Open discussion, when kept respectful, and with a common goal (education) is great for everybody. Thanks Robert!

 

[imported_WCD]

Festool 6" Sander ETS150/5



Is this the model? There is one on CL for 239 with low hours and I need this or the Flex.



Thanks for those that know, Rob

 

[imported_WCD]

I also have the dynabrade attachment for my makita, but it adds up to about 13 lbs. so not big on the weight after a few hours of work.

 

[imported_WhyteWizard]

THOOO1,





From your post. "Because an orbit is 360 degrees both directions spend an equal time moving against the pad’s rotation and with the pad’s rotation."





Robert: Thank you for correcting something I got wrong. I was looking at the way the Flex achieved rotation and seeing that it resulted in a scalloped shape movement, that the a point on the pad would come to a complete stop where the orbit at the center came closest to the housing and reverse direction. In any case, there would be a scallop shape with the arc to the inside. I was thinking this wouldn't happen that the shape of the movement would be different on the Makita, more of a waveform, because of the drive of the planetary gears. I think I got that wrong, so, good work!



Also, I was thinking that at the center, the orbit would result in movement that totaled the opms times the circumference, I still think that's true about the flex because it's that's movement that creates all the drive, it would happen with or without the interface between the backing plate and the housing but it only happens right in the center, so it can't be added to the total directly. Again, nice work on your part.







THOOO1: "I do agree that the drive system on the Flex takes more power to operate then the efficient planetary gears on the Makita (not to mention centripetal force will actual want to spin the pad in the same direction as the orbit) but much like race car, the amount of power used to drive the movement doesn’t matter, the amount of power that reaches the rear wheels does.



The Flex is a very hard machine to bog, even with an inefficient drive system, because it is so powerful. It’s like horsepower measured at the wheel, if you have enough to hit redline in top gear, more will not make you faster.



I would assume that the Makita (because of it’s more efficient direction that works with centrifugal force and gearing) is pretty bog resistant as well, although likely not as much as the Flex."



Robert: The Flex only draws .1 amps more than the Makita and I doubt seriously putting enough pressure on either one to cause any bogging at all would be a good idea. You'd be warping the panels on a lot of cars. So, while it may be a factor in determining which machine is under less stress most the time and considering how each will hold up over time, bogging isn't something I'd suggest you even try.







THOOO1 "I love discussions such as this and appreciate anybody who takes the amount of time to think of such *trivial* things like I do. Open discussion, when kept respectful, and with a common goal (education) is great for everybody. Thanks Robert!"





Robert: I couldn't agree more. I'm pretty sure you're used to being the smartest person in the room, it's been a pleasure talking with you.



BTW, I still think driving the orbit in the direction of the spin creates more movement between the pad and the paint but only because the arc is further from the center more of the time, not because of the over all shape of the movement.

 

[Accumulator]

Any ideas regarding how the planetary gear system of the Makita would hold up to applied pressure?



I'm merely curious; I don't want to overemphasize applying pressure, and IMO applying too much pressure is likely to lead to issues with the Flex....but with all the Flex-user talk about backing plate-to-housing contact/lubing the felt ring/ etc. I get the impression that some people do lean on it pretty hard.

 

[gmblack3]

Festool 6" Sander ETS150/5



Is this the model? There is one on CL for 239 with low hours and I need this or the Flex.



Thanks for those that know, Rob

The festool I have is the 150 FEQ.

 

[imported_WhyteWizard]

Any ideas regarding how the planetary gear system of the Makita would hold up to applied pressure?



I'm merely curious; I don't want to overemphasize applying pressure, and IMO applying too much pressure is likely to lead to issues with the Flex....but with all the Flex-user talk about backing plate-to-housing contact/lubing the felt ring/ etc. I get the impression that some people do lean on it pretty hard.

It holds up very well.



Robert

 

[Accumulator]

WhyteWizard- Ah, OK, roger that.

 

[Junebug]

Damn it - now I want a BO6040, well, my 51st B-day is only 4 months away and ....

 

[imported_WhyteWizard]

Damn it - now I want a BO6040, well, my 51st B-day is only 4 months away and ....

By that time I hope to have a decent video up showing exactly how I run it. Notice I didn't say, "How to use it." That's because someone else might have a better technique and if they do, I'll change.



Robert

 

[Junebug]

Well, the wife and my mom got together and bought a nice electric power washer from Northern Tool this Saturday, and with the little air compressor I got from work bonus points - things are looking up. It takes time to get your shop just the way you want it, and even more time to become good at the tools/products/technique - but it's an interesting ride!

 

[Woob]

Great informative discussion

Well, the wife and my mom got together and bought a nice electric power washer from Northern Tool this Saturday, and with the little air compressor I got from work bonus points - things are looking up. It takes time to get your shop just the way you want it, and even more time to become good at the tools/products/technique - but it's an interesting ride!

Off Topic a little: Which power washer setup did you get?