760 Module Info

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760 Module Info

Postby vic7767 » April 22nd, 2011, 3:48 pm

After receiving the 760 from UPS (early today) as I opened the box the decision was made to perform a thorough inspection of the robot for possible damage. During the inspection several observations and compairisons were made between the 500 model modules and the new 760 modules. It appears that the 500 model modules like drive wheels, side brush and even the CHM are interchangable. I even went so far as to remove the 760 CHM and install a 500 model CHM inside it and everything fit and ran. Only for a few moments, because I wanted to check other things on this new model. The SCI port is now located under the right side of the top handle so no more popping the designer cover off to gain SCI access.

The new Gray CHM seems to be built very well but only some test runs will determine how effective the new design is. If there are still issues with this model CHM it is going to be VERY difficult to mod.
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Re: 760 Module Info

Postby vic7767 » April 22nd, 2011, 3:53 pm

Additional CHM photos.
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700_CHM_Gears.JPG
CHM_Compare.JPG
Last edited by vic7767 on April 22nd, 2011, 11:06 pm, edited 1 time in total.
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Re: 760 Module Info

Postby Fraggboy » April 22nd, 2011, 5:55 pm

Voided the warranty before you ran it!!! :D Thank You for sharing with us!! :clap:
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Re: 760 Module Info

Postby roboroomba » April 22nd, 2011, 7:12 pm

can you post some more pictures of how the chm goes together please, also why do you think it will be harder to mod?, and can you also take some pictures of the vacuum bin, and do a comparison with a 5xx bin.

as for the taking all apart before you even ran it, I did do that with my 440 to, before I even charged it up I took it all apart to see what was inside.
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Re: 760 Module Info

Postby TechGuy » April 22nd, 2011, 7:59 pm

vic7767 wrote:...
The new Gray CHM seems to be built very well but only some test runs will determine how effective the new design is. If there are still issues with this model CHM it is going to be VERY difficult to mod.

I see what you mean... The inside geometry will limit the OD of the ball bearings used for the mod. Let hope the new design solve the problem. But the new design is still not sealed!

even the CHM are interchangable. I even went so far as to remove the 760 CHM and install a 500 model CHM inside it and everything fit and ran.

So iRobot may discontinue the old CHM. If the new one does not live up with our expectation, the old CHM will be at premium price as the old CHM can be modified easily.
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Re: 760 Module Info

Postby vic7767 » April 22nd, 2011, 8:52 pm

Update on the Gray vs Green CHMs and the ability to swap them. It appears that although the two CHMs can be physically mounted into either model Roomba, the dust bins become an issue. Therefore I have to retract the statement about using the CHMs in either model.
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Re: 760 Module Info

Postby vic7767 » April 24th, 2011, 9:02 pm

The Aero-vac-2 gathers much debris into the bin but lots of hair still on the two cleaning brushes.

No improvement in the dust bunnies under the side brush either.
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760_side_brush.JPG
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Re: 760 Module Info

Postby Fraggboy » April 24th, 2011, 9:15 pm

Vic,

Are you thinking about trying the felt mod to keep the hair from wrapping around the ends?
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Re: 760 Module Info

Postby vic7767 » April 24th, 2011, 10:28 pm

That's a tough one to answer Chris, due to the difference in CHM design, I'm looking at how to adapt it for the 500 models then possibly further mods.
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Re: 760 Module Info

Postby Fraggboy » April 24th, 2011, 10:35 pm

Could you see any hair getting inside the gearbox, or close to it?
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Re: 760 Module Info

Postby vic7767 » April 24th, 2011, 10:49 pm

Those pictures are from the first run. No egress into the gear box assembly was noticed with just one run. Testing continues.
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Re: 760 Module Info

Postby Fraggboy » April 24th, 2011, 10:55 pm

Can you perform the bearing mod as easily as the 5xx CHM's, or is that area much different?
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Re: 760 Module Info

Postby vic7767 » April 24th, 2011, 11:00 pm

It would be like starting from scratch and also more difficult due to the new design of the brush gear that won't allow the individual gears to be filed down the same way the 500 gears are done.
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Re: 760 Module Info

Postby Fraggboy » April 24th, 2011, 11:02 pm

Well, then I HOPE iRobot took care of the debris entering the CHM then.. ;)

Time will tell. . .
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Re: 760 Module Info

Postby chipskittles » April 24th, 2011, 11:20 pm

If only iRobot would take notice, a lot of useful and free ideas show up on this forum...
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Re: 760 Module Info

Postby Xamindar » April 25th, 2011, 2:15 am

Thanks for the nice pictures Vic. Could you explain a little more of how the swapped CHM does not line up properly with the bin? I wonder why irobot would keep the new CHMs compatible with the old mounts if it wasn't swappable.
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Re: 760 Module Info

Postby mfortuna » April 25th, 2011, 6:27 am

Ed, it is hard to see. Is that some kind of sealing material in the gearbox for the large gear? I wonder why the small gear doesn't have it.
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Re: 760 Module Info

Postby Gordon » April 25th, 2011, 10:41 am

mfortuna wrote:Ed, it is hard to see. Is that some kind of sealing material in the gearbox for the large gear? I wonder why the small gear doesn't have it.
Mike, I think what you are seeing is an annular void surrounding the labyrinth "seal" structure (the female portion, seen as two circular 'walls', or ribs, forming a circular groove between them).

The "annular void" is the interior hollow, cylindrically shaped, volume omitted from what is (when viewed from the brush side) a new cylindrical shroud that surrounds the driven-end of the bristle brush. The shroud, in combination with the extended core of the brush, constitutes a semi-labyrinth seal on the brush-side of the gear case. That's about all there is to the 7XX-Roomba's brush deck sealing, IMHO.

Oh yeah; the reason for the "void" is to save material, and to minimize unsightly shrinkage depressions.
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Re: 760 Module Info

Postby bravelittleroomba » April 25th, 2011, 9:11 pm

Thanks for the reviews, Vic, and sacrificing your 760's warranty for the greater good. :)

Does it clean any better than the 5xx's?

To me it doesn't really appear all that different. It seems that there is a smaller margin of change and improvement with each generation of roomba. 2nd generation was a huge leap up from the 1st generation, 3rd gen {500's} a moderate improvement, 4th gen {700's} seems marginal, although if the CHM remains debris free {or nearly so} on its own, it cleans better, and lasts longer {gotta love those 9 beep errors...} it will IMO be worth investing in the 700s over the 500s. But they're making a big deal about, say, those touch screen buttons. Really? honestly it's a bad sign that that's one of the few things they're playing up about the 700s. A fancier set of...buttons.
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Re: 760 Module Info

Postby keigo » April 25th, 2011, 10:00 pm

Is the charger the same as 5xx series..?
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