Epoch Indoor Racer - epoch1-43.com

Go Back   epoch1-43.com Forums > General Discussion > Parts and Hop-Ups

Reply
 
Thread Tools Display Modes
  #1  
Old 03-23-2006, 07:03 AM
LBRC LBRC is offline
Senior Member
 
Join Date: Jul 2005
Posts: 178
Default Hairball Medicine 2, Front wheel bearings


The problem isn’t just that hair and lint gets in between the hub and knuckle it also works its way in between the axle and the hole it spins in.

When you slow the front wheels they slide while the rear wheels loose traction pushing on them so handling goes out the window. In a shallow turn the wheels don’t want to roll so they end up sliding as they get pushed forward “under-steer” but as you turn sharper they dig in with increased resistance while the rear wheels loose traction “over-steer” might as well stop and hack up another hairball, it’s a loose-loose situation in many ways even worse than having hair in your differential.

The fix of course is ball bearings.

The good news is that I finally came up with a relatively simple install that truly works, the bad is that the bearing hole has to be perfectly centered, and exactly the right depth. Even a standard drill press won’t work, and using a mill as a precision drill is iffy at best, you need a lathe with a center drill.
http://lbspd.com/v-web/gallery/album.../5_G.thumb.jpg
For the current batch of bearings I have a 5/32” drill bit is perfect, tight enough so that the bearing has to be pressed in so that it is held securely but can be removed if needed, for added security a very small drop of lock-tight on the outer bearing wall so that none gets on the sides will ensure that it will never accidentally come loose.
http://lbspd.com/v-web/gallery/album.../6_G.thumb.jpg
http://lbspd.com/v-web/gallery/album.../9_G.thumb.jpg
Unfortunately there’s another problem, the axle has to be precisely the right diameter to press tightly into the bearing without expanding the walls enough to do damage. For my current batch of bearings that exactly 0.060 inches, 0.059 inches is so loose that it just slips out while 0.0605” slows the bearing down and 0.061” damages the bearing enough that you can feel the roughness.
http://lbspd.com/v-web/gallery/album.../7_G.thumb.jpg
The good news is that you get to choose the knuckle to wheel spacing so it can be optimized for the tire/wheel width and the particular body you want to use. Again a simple drop of lock-tight or CA will insure it stays right where you want it.

Aside from the lathe, two tools that come in very handy are an inexpensive feeler gage set to accurately measure and set the hub-to-knuckle spacing, and a pinion puller which can be used to press the axle into the bearing and knuckle as well as remove them when needed.
Reply With Quote
  #2  
Old 03-31-2006, 08:14 AM
will3kgt will3kgt is offline
Newbie
 
Join Date: Nov 2005
Location: Grand Blanc
Posts: 17
Default

Hello LBRC,
I tested out the LiPo Epoch at the Ann Arbor races and once again I'm quite amazed. When you're ready to put them on the market I'll be one of the first to purchase one.
Reply With Quote
  #3  
Old 04-01-2006, 07:19 AM
LBRC LBRC is offline
Senior Member
 
Join Date: Jul 2005
Posts: 178
Default

Now that the anodizing process is working I’ve started to put a few together.

Sounds like you’ve only been using the LiPo pack in Ann Arbor, has anyone tried it with the Kan 180’s? I now have some new 10x18mm 195mah NiMH cells that are even an improvement on the Kan’s.

Still trying to get motor opinions, not so much on speed, so far everyone seems to agree that they are fast enough, more how people feel about the torque range, would more low end torque be an improvement?
Have they run the red motor car yet, or does it still have differential problems?
Reply With Quote
  #4  
Old 04-03-2006, 11:55 PM
arch2b arch2b is offline
Administrator
 
Join Date: Jul 2005
Location: Washington, DC
Posts: 317
Send a message via AIM to arch2b
Default

very impressive!
Reply With Quote
  #5  
Old 04-06-2010, 07:08 AM
leomartin6 leomartin6 is offline
Newbie
 
Join Date: Apr 2010
Posts: 1
Default

I'll definitely find them in the market.
__________________
The 156-215 and 156-215.70 is worldwide accredited certification that validates in ccna exam and 156-315 with the professional’s knowledge and skills of IT system security.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
wheel bearings? dog Parts and Hop-Ups 5 10-26-2011 05:56 PM
Hairball Medicine (Differential Fix) LBRC Parts and Hop-Ups 12 08-01-2005 05:25 PM


All times are GMT. The time now is 10:00 PM.

 


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.