WC

iTrader: (28)

ok, you know motor brushes are not Square in cross-section.
They have 1 side which is longer than it is wide.


In the old days, brushes were all mounted with their longer side
parallel to the armature's shaft. These are known as "stand up".

In recent years, some motors have the brushes mounted 90degs,
these are called "laydown".

Because new brushes usually come with the "C" curved end
already cut into them, you need different brushes for each type
so the brush contacts the comm properly.


Dunno re LR, SR...?


Brushes also come in different materials. Usually its a combination
of copper and silver; silver is better for passing current but it is
harsher on your comm and will chew comms up faster.

davioh

LR and SR are the specific type of Yokomo motors...laydown and stand up are the type of brush...laydown is flat (ish) and standup is standing up

Disney

LR and SR are the specific type of Yokomo motors...laydown and stand up are the type of brush...laydown is flat (ish) and standup is standing up

blixelX

which 1 is better?? laydown or stand up??

blixelX

hi... seems like my previous question is too stupid, coz no one wanna spend time to answer me...

anyway, i hav another question here... i found out that my car is not going in straight line... it will side abit to right when i had a right turn and side abit to left when had a left turn... what i did is after a right turn, i will turn a bit to left to make the steering straight... am i confusing u guys???

will this be the servo problem? or my car's setup got problem???

WC

iTrader: (28)

That's because you asked a "how long is a piece of string" question!

There is no 100% "better" way to sit your brush, best try both.
There are pros & cons with both styles.
However its usually not possible to back-to-back testing with the
same model of motor unless you change the brush hoods etc with
another different type motor.

On top of that, there are now "fat comms" to play with too!
(commutators which are Big Berthas compared to normal)

I think you have got wear in your steering.

Rebuild your steering, checking for freeplay in all the linkage.
Usually the ballcups would have worn a bit, and the arms etc
have a bit of shake. You can either space them better with
washers etc and pack some teflon plumbers tape on the
balljoints.

blixelX

thz wc... will try to re-assemble again... anyway, i had a spare servo (used with msc) which come with the remote control, and i tried it, its seems better...

yah... i had lost a ball bearing, can i replace it by a bushing (plastic)?? its at the wheel axle there... any1 know is there any place in s'pore got sell ball bearing seperately? means just few pieces?? thz...

WC

iTrader: (28)

Any hobbyshop in S'pore should be able to sell you a loose 1150
bearing (OD 11mm, ID 5mm) as its a commonest Tamiya size.

Don't pay more than S$5 per piece!!



Where did you get the plastic bushing from??
Its harder to buy these (spare), and to find loose 1150s.

Ya you can use them temporarily, for some performance loss.
I usually carry some in my toolbox just in case I lose/destroy a
bearing at the track then at least its better than nothing.

blixelX

hey man, the plastic bushing is fr my fren's tl01... so does the s'wan at orchard plaza selling seperately?? told by some ppl that those ball bearing will only sell in whole set... and its not cheap...

WC

iTrader: (28)

Haha, yes S'wan should sell them loose; try ask at the counter.

Just buy any no-name metal-shielded ones, don't need "original"
Tamiya ones. Anything that fits the hole will work fine.

I don't know what is usual price for loose ones, probably around
$2-4 is reasonable. Maybe even up to $5 for single ones if you
only want 1pc... you'll spend more $$ travelling elsewhere, rite?

blixelX

thz man.... hope she will not sell me at very expensive price... haha...

blixelX

hi... i hav a question regarding the gearing... the gear ratio may same when having bigger spur or smaller pinion... which 1 is better? ok... just for example, having a 78T spur with 30T pinion will hav almost the same gear rayio with having 88T spur with 34T pinion... which 1 should we choose??

WC

iTrader: (28)

imho, really makes no difference.

(there's another thread that's just appeared on this, asking if 2 big spur/pinion is better than 2 small spur/pinion with the same ratio... but honestly speaking, one should have better things to worry about in life than that.)

Same like on your "21 speed" bicycle... there's 21 different possible ratios, a few of which are pretty much "same" ratio as another combination. You really only use about 5-6 combinations of those gears in general riding anyway.

blixelX

yah... saw that thread too... thought hav diff thats y spoke out...

1 more doubt is regarding the battery... i am using Ni-mh battery... do i need to use the batt till flat then charge or i can just charge it when the performance hav dropped??

KiwiKid

Hey Blixelx,

I noticed that most of your queries are tending to cover pretty general topics. You might want to check out the 'rookie zone' threads as I'm pretty sure most of your answers can be found there.

Cheers.