R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 08-30-2010, 03:23 PM   #5506
Tech Addict
 
hana166's Avatar
 
Join Date: Jul 2004
Posts: 677
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by pcar951 View Post
Anyone noticed their Gear diffs leaking slightly?
Yeah what a total PITA...the fluid goes in the bearing and gums it up leading to unpredictable handling

Hopefully it will stop when the fluid levels go down enough

Also it was too tight, I made a gasket out of card to space out each side of the case to enable the bevel gears to move smoothly, its perfect now

Works well (at last) and at least its metal geared
hana166 is offline   Reply With Quote
Old 08-30-2010, 03:32 PM   #5507
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 25,181
Trader Rating: 140 (100%+)
Default

Quote:
Originally Posted by hana166 View Post
Yeah what a total PITA...the fluid goes in the bearing and gums it up leading to unpredictable handling

Hopefully it will stop when the fluid levels go down enough

Also it was too tight, I made a gasket out of card to space out each side of the case to enable the bevel gears to move smoothly, its perfect now

Works well (at last) and at least its metal geared
Really what type of fluid are you using ? Mine haven't leaked at all.
Marcos.J is offline   Reply With Quote
Old 08-30-2010, 04:03 PM   #5508
Tech Champion
 
stiltskin's Avatar
 
Join Date: Jun 2005
Location: Virginia Beach
Posts: 5,305
Trader Rating: 99 (100%+)
Default

Quote:
Originally Posted by Marcos.J View Post
Really what type of fluid are you using ? Mine haven't leaked at all.
No leaks here either. I've had excess oil seep out after a rebuild, but nothing more.

As for the TOP website, I really haven't looked at it for months. Once I dealt with Michael on the phone, I didn't have any reason to get back on the website. I realize that today most people would rather just point and click and see the package in a few days, but I like the personal attention. 2nd to none.
__________________
Tony Rumple
Team EAM // Gravity RC
stiltskin is offline   Reply With Quote
Old 08-30-2010, 04:56 PM   #5509
Tech Master
 
pcar951's Avatar
 
Join Date: Dec 2005
Location: Cow Town
Posts: 1,661
Trader Rating: 19 (100%+)
Default

Both my front and rear gear diffs are leaking slightly around the outdrive inserts. hana166 is right, it's getting in the outdrive bearings. I may have overfilled them though.... Is there a way of telling how much fluid is enough?
__________________
Jim Chapman
PM Hobbycraft | RCAmerica | Xray | Hudy | Reds Racing
pcar951 is offline   Reply With Quote
Old 08-30-2010, 07:35 PM   #5510
Tech Addict
 
paraletic's Avatar
 
Join Date: Apr 2009
Location: ADELAIDE
Posts: 553
Trader Rating: 13 (100%+)
Default Diff failure

Has anyone else had a get diff fail/die on them?

I was using a gear diff front n rear just this weekend gone in a large 4day event
car was great all through practice and the first heat
then part way into my second heat the front diff let go, I went from first place to last in the heat
the diff would lock up the rotate notchy like then lock up then freewheel a few rotations before locking up again
under braking the rear would oversteer badly and on acceleration from corners it would oversteer badly too
took another qualifier to work out what had happened

after opening the diff we found heaps of metal filings in the oil it was like a grey metalic grease
all the gears had the tops of the teeth "buzzed" off
after fully cleaning the diff I havnt found any cracked gears etc, but it almost looks like it was starved of lube?
The thrust washers were badly scored the pin was worn badly the backs of the gears was scored up and even looks like the plastic housing got hot and scored/melted a bit
maybe under load the diff fluid is forced out and can't get back in cos it's to thick??
anyone else had this problem?
I was running exceed 100,000 in the diff with a 17.5 and a hobbywing speedy
__________________
Losi XXX-S G+..................Tamiya M03.......................TOP Photon
Losi XXX-4 G+.................HoBao ST Pro electric........Losi Micro SCT
Losi XXX-CR....................Losi Mini Baja.....................Losi XX-4 W/E
ASSociated RC12L4
T.O.P PHOTON EX & Tamiya M05 - currently undergoing rigorous crash testing!
paraletic is offline   Reply With Quote
Old 08-30-2010, 07:51 PM   #5511
Tech Master
 
locked's Avatar
 
Join Date: Mar 2010
Location: Toronto
Posts: 1,758
Trader Rating: 1 (100%+)
Default

Who is buying crap peddled by spammers? Someone must be or it wouldn't be worthwhile for them to keep annoying everyone else.

Last edited by locked; 08-30-2010 at 07:54 PM. Reason: post i was referring to was deleted..carry on :)
locked is offline   Reply With Quote
Old 08-30-2010, 07:56 PM   #5512
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 25,181
Trader Rating: 140 (100%+)
Default

Quote:
Originally Posted by locked View Post
Who is buying crap peddled by spammers? Someone must be or it wouldn't be worthwhile for them to keep annoying everyone else.
sorry i had to delete and ban the spammer
Marcos.J is offline   Reply With Quote
Old 08-30-2010, 08:04 PM   #5513
Tech Addict
 
paraletic's Avatar
 
Join Date: Apr 2009
Location: ADELAIDE
Posts: 553
Trader Rating: 13 (100%+)
Default

Ok so looking further into my diff failure

when I bought the diff it had no intstructions etc, as they all seem to
I hav also got my hands on a maintenance kit which does have instructions, so looking through them and my original diff, I noticed that it came from the factory one shim less than the instructions state???

Without the extra shim this would allow the gears to move an therefore not mesh correctly hence causing premature failure- surely

so did I just get a dud ?? Or does someone else have the same with there diff?
Perhaps this is why no instructions are included??
__________________
Losi XXX-S G+..................Tamiya M03.......................TOP Photon
Losi XXX-4 G+.................HoBao ST Pro electric........Losi Micro SCT
Losi XXX-CR....................Losi Mini Baja.....................Losi XX-4 W/E
ASSociated RC12L4
T.O.P PHOTON EX & Tamiya M05 - currently undergoing rigorous crash testing!
paraletic is offline   Reply With Quote
Old 08-30-2010, 08:19 PM   #5514
Tech Master
 
pcar951's Avatar
 
Join Date: Dec 2005
Location: Cow Town
Posts: 1,661
Trader Rating: 19 (100%+)
Default

My diffs haven't failed in fact, they're getting smoother with each run, just leaking a little. Too bad you had one crap out! It's not the 20 bucks that rips ya, it's the DNF, right.
__________________
Jim Chapman
PM Hobbycraft | RCAmerica | Xray | Hudy | Reds Racing
pcar951 is offline   Reply With Quote
Old 08-30-2010, 08:31 PM   #5515
Tech Addict
 
paraletic's Avatar
 
Join Date: Apr 2009
Location: ADELAIDE
Posts: 553
Trader Rating: 13 (100%+)
Default

Yea pretty much
I just don't want it happening again
so trying to work out how make sure it doesn't
and if it was just a dud unit- therefore a correct rebuild will fix the problem- or it's something else
__________________
Losi XXX-S G+..................Tamiya M03.......................TOP Photon
Losi XXX-4 G+.................HoBao ST Pro electric........Losi Micro SCT
Losi XXX-CR....................Losi Mini Baja.....................Losi XX-4 W/E
ASSociated RC12L4
T.O.P PHOTON EX & Tamiya M05 - currently undergoing rigorous crash testing!
paraletic is offline   Reply With Quote
Old 08-31-2010, 01:42 AM   #5516
Tech Adept
 
Join Date: Oct 2007
Posts: 125
Trader Rating: 2 (100%+)
Default Wheel Hex

Photon Lovers.

Anyone else had problems with the wheel hex from the kit or the optional 6.2mm?

With the Kit versions, they deformed when the holding screw was screwed in..
and
the 6.2mm i've got 2 out of the 4 with difference in the depth (on each side) to where the pin sits.. creating a wobble in the wheel..

I'm thinking of trying an alternative: here for a cough, ahem blue car

These look very similar, Can anyone recommend an alternative that they have used successfully.

am i alone?

To troubleshoot I simply used brand new wheels, and moved the hex and wheel to various corners of the car to identify which hex's are bad.
Then using a digital caliper i've measured the depth to where the pin sits and found a 0.06mm difference..


I'm approaching the retailer(s) for an exchange/solution I'll let you know of the outcome.
anthony_ling is offline   Reply With Quote
Old 08-31-2010, 01:55 AM   #5517
RBR
Tech Initiate
 
Join Date: Jun 2010
Posts: 31
Trader Rating: 3 (100%+)
Default

mine also deform a bit. how bad is the wheel wobble?

no wheel is perfect, there will definately be some wobbling during rotation.
RBR is offline   Reply With Quote
Old 08-31-2010, 02:37 AM   #5518
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,811
Default

Quote:
Originally Posted by anthony_ling View Post
Photon Lovers.

Anyone else had problems with the wheel hex from the kit or the optional 6.2mm?

With the Kit versions, they deformed when the holding screw was screwed in..
and
the 6.2mm i've got 2 out of the 4 with difference in the depth (on each side) to where the pin sits.. creating a wobble in the wheel..

I'm thinking of trying an alternative: here for a cough, ahem blue car

These look very similar, Can anyone recommend an alternative that they have used successfully.

am i alone?

To troubleshoot I simply used brand new wheels, and moved the hex and wheel to various corners of the car to identify which hex's are bad.
Then using a digital caliper i've measured the depth to where the pin sits and found a 0.06mm difference..


I'm approaching the retailer(s) for an exchange/solution I'll let you know of the outcome.
You are fuming over a 0.06mm tolerance in the part, measured with a caliper with a likely claimed tolerance of 0.02mm itself? No offence, but I think your expectations of how accurate these parts should be is too high, especially if this is a used part you are measuring. You are talking about the size of a grain of sand.

There are many problems that I can see with the clamp design hub, but it applies to all manufacturers. I've always preferred the captive pin style of hub (a la older Yokomo's), but Tamiya do the clamp hub so that is probably why everyone else has copied it! I very much doubt the 3Racing hubs would have tighter tolerances than the TOP parts.
sosidge is offline   Reply With Quote
Old 08-31-2010, 03:15 AM   #5519
Tech Adept
 
Join Date: Oct 2007
Posts: 125
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by sosidge View Post
You are fuming over a 0.06mm tolerance in the part, measured with a caliper with a likely claimed tolerance of 0.02mm itself? No offence, but I think your expectations of how accurate these parts should be is too high, especially if this is a used part you are measuring. You are talking about the size of a grain of sand.
The end result is a 1.5-2mm wobble at the tread, would you be happy with that? Maybe i've used the wrong icon,... is there one for frustrated?
I've been running nitro (foams) for years and haven't seen the problem before. I have 2 wheels that have some wobble, and I accept that... the other two with the bad hex, I don't accept, i'm not sure that the 0.06 difference is the cause, but i know the hex is the problem.

Quote:
Originally Posted by sosidge View Post
There are many problems that I can see with the clamp design hub, but it applies to all manufacturers. I've always preferred the captive pin style of hub (a la older Yokomo's), but Tamiya do the clamp hub so that is probably why everyone else has copied it! I very much doubt the 3Racing hubs would have tighter tolerances than the TOP parts.
agreed, hence why i'm asking for suggestions..

Last edited by anthony_ling; 08-31-2010 at 03:49 AM.
anthony_ling is offline   Reply With Quote
Old 08-31-2010, 04:46 AM   #5520
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,811
Default

Quote:
Originally Posted by anthony_ling View Post
The end result is a 1.5-2mm wobble at the tread, would you be happy with that? Maybe i've used the wrong icon,... is there one for frustrated?
I've been running nitro (foams) for years and haven't seen the problem before. I have 2 wheels that have some wobble, and I accept that... the other two with the bad hex, I don't accept, i'm not sure that the 0.06 difference is the cause, but i know the hex is the problem.



agreed, hence why i'm asking for suggestions..
Well, I've done a few calculations and measurements, and even with 0.06mm difference in the hex right at the point where the axle goes through, you would still get only 0.75mm difference at the wheel rim. I personally was unable to measure the depth of the pin groove in my cars hexes as my caliper will not fit in there or find a reliable flat to use as a reference plane.

But, regardless of that, I don't doubt that you are getting 1.5-2mm difference at the rim, and no I wouldn't be happy about it.

But there are a great number of factors beyond just the machining of the hex that can cause this - buckled wheels, bent axles, bent pins, all of which are possible on a car that has been run. Or is this car brand new out of the box and exhibiting these problems on the first build?

Either way, 0.06mm would likely be within the machining tolerance of the part, you could try exchanging parts until you get two more that are correct but it might be a long process.

As far as the hexes go, the clamp type puts a stress on the hex in the direction it is supposed to be driving the wheels... not good. And sometimes they tighten in such a way that the originally flat hex surface is slightly distorted. Captive pin types (made by Yokomo but anodised red) were use on the early Scythes - 3146R-SET2 should be the part number for a pair, if you can find them. Or get them from an old Yokomo. I've just test fitted one on my Photon and they go on fine, albeit with a slightly different offset, approaching 1mm wider than the standard 5.2mm Photon hex.
sosidge is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 04:15 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net

SEO by vBSEO 3.5.0