R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 01-09-2007, 01:51 PM   #1
Tech Adept
 
OscarF1's Avatar
 
Join Date: Oct 2006
Posts: 103
Default Slipping Spool

Quote:
In Modified, spool is the way to go, no doubt!!
So I hear from al lot of top level drivers,
they also complain about the wear out of the drive shafts.

The forces ( dont underestimate the force ) building up
in for instance braking are enormous.

Some also tried a diff without balls,
but i think the pressure from the M2 bolt is not enough.

Has anyone tried to make an slightly slipping spool,
that let your axles live but gives the extra corner power
and braking possibility?
OscarF1 is offline   Reply With Quote
Old 01-09-2007, 01:53 PM   #2
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,219
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by OscarF1
So I hear from al lot of top level drivers,
they also complain about the wear out of the drive shafts.

The forces ( dont underestimate the force ) building up
in for instance braking are enormous.

Some also tried a diff without balls,
but i think the pressure from the M2 bolt is not enough.

Has anyone tried to make an slightly slipping spool,
that let your axles live but gives the extra corner power
and braking possibility?
thats when the diff with out diffballs comes in
Marcos.J is offline   Reply With Quote
Old 01-09-2007, 02:08 PM   #3
Tech Adept
 
OscarF1's Avatar
 
Join Date: Oct 2006
Posts: 103
Default

Refrase:

Did anyone try to build somthing a bit stronger ( stiffer ) than a diff without balls?
OscarF1 is offline   Reply With Quote
Old 01-09-2007, 02:17 PM   #4
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,219
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by OscarF1
Refrase:

Did anyone try to build somthing a bit stronger ( stiffer ) than a diff without balls?
AdrianM from Schumacher U.S.A can explain it alot better than I could !
Marcos.J is offline   Reply With Quote
Old 01-09-2007, 02:23 PM   #5
Tech Adept
 
OscarF1's Avatar
 
Join Date: Oct 2006
Posts: 103
Default

Quote:
Originally Posted by Marcos.J
AdrianM from Schumacher U.S.A can explain it alot better than I could !
Does he read this forum ?
OscarF1 is offline   Reply With Quote
Old 01-09-2007, 02:25 PM   #6
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,219
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by OscarF1
Does he read this forum ?
yes very often!!
Marcos.J is offline   Reply With Quote
Old 01-09-2007, 02:26 PM   #7
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,219
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by OscarF1
Does he read this forum ?
this is his sreen name AdrianM shot him a pm
Marcos.J is offline   Reply With Quote
Old 01-09-2007, 03:01 PM   #8
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,763
Default

Just tighten up a normal diff.

I think the guys are refering to the diff where you take the diff balls out, then use two cardboard (cereal packet type) shims betwen the diff rings and the plastic pulley.

Skiddins
__________________
Xray T4'18, T4'14 (Wet Car)
Xray X12 2018
Xray X1'16
wlrc.co.uk (West London Racing Centre)
RCDisco.co.uk
Skiddins is offline   Reply With Quote
Old 01-09-2007, 03:04 PM   #9
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

If you crash enough that you are too frequently damaging your spool you can build a slipper spool out of a front diff. I think Losi was the first to do this with their XXXS.

A slipper spool functions the same as a spool under normal racing conditions but if you crash the out drives can slip to prevent damage

To do this you will need a front ball diff. If your car uses diff out put blades on the drive shafts you can use alloy diff out puts. If your drive shafts use steel pins you need to use steel diff outputs.

This is how to make a slipper spool:

1. Disassemble your ball diff and remove the diff balls. Clean the diff pulley with motor spray untill all the diff lube is gone. Clean the diff rings the same way.

2. Glue card stock (header cars, business card, note card,...) to one side of each diff ring with CA. Cut out the rings so you end up with diff rings faced on ove side with card stock.

3. Re-assemble the diff without the diff balls and with the paper side of the diff rings toward the diff pully.

4. Tighter and adjust your new slipper spool like a ball diff. On a Schumacher we tighten the diff screw until it stops then back it off ~1/4 turn.

Thats it!

The card stock takes up the space the diff balls took up so the width of the diff remains correct. The paper also makes it harder to slip.

As long as you don't hit anything its a spool and it will not move. However, it will move if you crash and allow the energy of the crash to disperse before you blades, drive shafts or suspension gets damaged.

Note that this works better on cars with stout M3 diff screws like Schumachers and Xrays. If you have a small diff screw it may snap. In that case run a normal spool and learn not to crash
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 01-09-2007, 04:19 PM   #10
Tech Adept
 
OscarF1's Avatar
 
Join Date: Oct 2006
Posts: 103
Default

Quote:
Note that this works better on cars with stout M3 diff screws like Schumachers and Xrays. If you have a small diff screw it may snap. In that case run a normal spool and learn not to crash
Verry clear

Thanks AdrianM !

I will try it with some thin epoxy plate rings in the diff pully.

Also find a way to make a strong M3 diff screw fit.

I assume its okay to leave the spring out but do i need the thrust bearing ?
OscarF1 is offline   Reply With Quote
Old 01-09-2007, 05:17 PM   #11
Tech Elite
 
2-Bad's Avatar
 
Join Date: Jan 2003
Location: Australia
Posts: 2,725
Trader Rating: 24 (100%+)
Default

In the original XXXS the spool pads weren't very good. I used them in my JRX-S and they would come loose after about 3 race meetings. Losi have new ones out now but I don't know how there fairing.
http://www.teamlosi.com/newprod/index.htm

When I was running the JRX-S, I used these;
http://www2.towerhobbies.com/cgi-bin...?&I=LXC590&P=7

Just drilled out a hole for the centre bearing, face the grit side to the diff ring (paper side to the pulley) and tighten up. The OD was a perfect fit for the Losi pulley, I ran them for over 6 months without it slipping too much and only had normal wear of the outdrives.
Good luck....


Regards,
Peter
__________________
Yokomo * G Force * Sanwa * SMC * ProSpec
2-Bad is offline   Reply With Quote
Old 01-09-2007, 06:43 PM   #12
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

You guys are missing the point. Epoxy and sand paper will make it solid and it will break just like a machined one piece spool.

Besides, if you want a diff all you need to do is replace the diff rings and add diff balls.

The slipper diffs I have run never wear out. Eventually a big enough hit can break an outdrive but the paper and diff pulley never wear out. Like I said the only time it slips is during crashes.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 01-09-2007, 07:43 PM   #13
Tech Elite
 
2-Bad's Avatar
 
Join Date: Jan 2003
Location: Australia
Posts: 2,725
Trader Rating: 24 (100%+)
Default

Quote:
Originally Posted by AdrianM
You guys are missing the point. Epoxy and sand paper will make it solid and it will break just like a machined one piece spool.

Besides, if you want a diff all you need to do is replace the diff rings and add diff balls.

The slipper diffs I have run never wear out. Eventually a big enough hit can break an outdrive but the paper and diff pulley never wear out. Like I said the only time it slips is during crashes.
Adrian... is it OK if I share my experiences thou....

I could never get the original Losi spool pads to stay tight... I also never broke an outdrive with the sandpaper pads either... But ultimately it comes down to what Oscar wants... so try the "business card" if it works Great. Problem solved. If it doesn't... then there are a few options
__________________
Yokomo * G Force * Sanwa * SMC * ProSpec

Last edited by 2-Bad; 01-09-2007 at 07:55 PM.
2-Bad is offline   Reply With Quote
Old 01-10-2007, 08:14 AM   #14
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by 2-Bad
Adrian... is it OK if I share my experiences thou....
Sorry, ...I didn't mean it that way. My post is more about offering novice drivers an alternative to a fixed spool so their cars dont get torn up.

You are absolutly right about the XXXS. I know a few Losi Pros drivers and they said the same thing when they ran it.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 01-10-2007, 08:30 AM   #15
Tech Elite
 
Yeti35's Avatar
 
Join Date: Sep 2004
Location: SL, UT
Posts: 2,804
Trader Rating: 5 (100%+)
Default

Not that this is going to help the OP, but I run a JRXS and use the Losi Spool Diff gears they put out now and really like it. It will offer some slip in a hard crash in the sense you are not tearing up outdrives but is solid other wise. I tried the sand disc as well and still have a new set in my box never to be used but the new Spool Gears are nice. Just my couple of cents worth.
__________________
JRXS Type R, I have four of them!! ;) ( Yes, I still have them!!)And racing one of them again!!
22 3.0SR
22T 2.0 w/ Exotech chassis
Yeti35 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help w/Slipping PLEASE "Spanky Electric Off-Road 11 07-14-2008 08:41 PM
Gears slipping mischa Nitro On-Road 13 07-07-2008 03:08 AM
Diff slipping 16skyline Electric On-Road 4 05-12-2008 06:49 PM
Starter Slipping... rok.my.sox Electric Off-Road 6 01-20-2007 01:48 AM
X-ray evo 2 diff is slipping dontfeelcold Australian Racing 6 11-09-2003 04:47 AM



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 04:13 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net