Jump to content




Photo

The old Mabuchi endbell crack


  • Please log in to reply
11 replies to this topic

#1 havlicek

havlicek

    OCD Rewinder

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 9,014 posts
  • Joined: 20-August 07
  • Gender:Male
  • Location:NY

Posted 19 May 2017 - 05:45 AM

... at this point, it seems like most all of the endbells (including NOS) have the crack around the bushing... but... oddly, this seems to be far less frequent with the black ones.  

 

On the white ones, sometimes the crack doesn't show up at first, but putting a drop of oil on the bushing can highlight the crack by filling it with the oil color. At first I thought the black ones probably have the same issue, but it's just harder to see... because they're black, but the black ones really do seem to have fewer cracks.  

 

So... is it just that whatever they added to make the endbell black also made it less prone to cracking? The white and black ones sure seem to be made of the same material.


  • mike1972chev likes this
John Havlicek




#2 Jaeger Team

Jaeger Team

    Rookie Keyboard Racer

  • Full Member
  • Pip
  • 13 posts
  • Joined: 27-January 17
  • Gender:Male
  • Location:Palermo, Italy

Posted 19 May 2017 - 07:09 AM

Hi John,

 

In the very early days I used to solve that problem like this...

 

ebs.jpg


  • havlicek and C. J. Bupgoo like this
Maurizio Salerno

#3 Jaeger Team

Jaeger Team

    Rookie Keyboard Racer

  • Full Member
  • Pip
  • 13 posts
  • Joined: 27-January 17
  • Gender:Male
  • Location:Palermo, Italy

Posted 19 May 2017 - 07:12 AM

I remember cracks at the same rate in white and black ones.


Maurizio Salerno

#4 Samiam

Samiam

    Posting Leader

  • Subscriber
  • PipPipPipPipPipPipPip
  • 4,028 posts
  • Joined: 18-January 12
  • Gender:Male
  • Location:Long Island, NY

Posted 19 May 2017 - 07:34 AM

In the very early days I used to solve that problem like this...

 

Good save. I'm going to use that.


Sam Levitch
 
"If you have integrity, nothing else matters, and if you do not have integrity, nothing else matters."
Robert Mueller,special council.(2013)
 

#5 havlicek

havlicek

    OCD Rewinder

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 9,014 posts
  • Joined: 20-August 07
  • Gender:Male
  • Location:NY

Posted 19 May 2017 - 08:02 AM

Hi Maurizio,

 

I've done that myself, but by reaming a piece of tubing... and the first one I did, I pretty much ruined the endbell by making the ring too tight.  Just relieving the end that goes on first a little, and leaving a snug fit is key. I also made sure it wouldn't slip off by drilling a tiny hole on the endbell and applying a very small amount of epoxy before installing. It seemed to work fine... but of course, it will make modifying any bracket involved necessary. If it's a cast chassis like Dynamic, that can make things extra difficult.  

 

Anyway... good one!


John Havlicek

#6 Jaeger Team

Jaeger Team

    Rookie Keyboard Racer

  • Full Member
  • Pip
  • 13 posts
  • Joined: 27-January 17
  • Gender:Male
  • Location:Palermo, Italy

Posted 19 May 2017 - 08:56 AM

Sure best for can side mounting. I recall that "tightness," too. Heat (not too much) was another way.
Maurizio Salerno

#7 Ramcatlarry

Ramcatlarry

    Checkered Flag in Hand

  • Subscriber
  • PipPipPipPipPipPip
  • 1,769 posts
  • Joined: 08-March 06
  • Gender:Male
  • Location:St Charles, IL 60174

Posted 19 May 2017 - 09:35 AM

And another reason wndbell drive motors were a bad design to never be used.


  • olescratch likes this

Larry D. Kelley, MA
retired raceway owner... (for now)
race directing around Chicago-land

USRA 2017 member #404
USSCA  member

Host 2006 ISRA/USA
Great Lakes Slot Car Club member
60+ year pin Racing rail/slot cars in America


#8 Phil Hackett

Phil Hackett

    Posting Leader

  • Full Member
  • PipPipPipPipPipPipPip
  • 4,402 posts
  • Joined: 29-January 07
  • Gender:Male
  • Location:A Big Red Star on a Kremlin Map

Posted 19 May 2017 - 06:38 PM

I believe the black endbells might have a bit of carbon black added to the plastic. I do not think they're dyed.


  • havlicek likes this
Click HERE to contact Sonic Products. The messenger feature on my Slotblog account has been disabled.

Posted Image

#9 havlicek

havlicek

    OCD Rewinder

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 9,014 posts
  • Joined: 20-August 07
  • Gender:Male
  • Location:NY

Posted 20 May 2017 - 06:02 AM

Yes, this seems to be the case. I will sometimes sand the back of the endbell, and the black runs through the plastic on the Mabuchis. On say the Mura endbells, the color will come off when you sand them. The Tradeship endbells are made of an entirely different plastic, and there too, the color runs through the plastic. It could be that adding the black changes the plastic's characteristics... good one, Phil!

The Champion endbells don't seem to have the cracking issue, and even though the material looks like it might be the same as the Mabuchi, it's supposed to be different and a little more durable. Then again, the Champion endbells have a much larger, sturdier bearing pocket molded-in. On the Mabuchis, there isn't a heckuva lot there.
John Havlicek

#10 proptop

proptop

    On The Lead Lap

  • Full Member
  • PipPipPipPip
  • 421 posts
  • Joined: 17-February 06
  • Gender:Male
  • Location:Upstate NY

Posted 20 May 2017 - 08:10 AM

I'm not 100% sure on this, but IIRC the Mabuchi endbells are made of Delrin?

 

Once again going from an ever increasingly "iffy" memory...while working at a machine shop in the 80's I ran some parts made of both the black and the white Delrin...and maybe, (???) the black felt just a wee bit different from the white? (coulda been imagining things tho)

Just a quick look through the specs doesn't turn up anything to confirm, but then again, I haven't tried looking very hard either...

 

The Tradeship endbells are glass filled nylon...


  • havlicek likes this
Tom Hemmes
Insert witty phrase here...

#11 havlicek

havlicek

    OCD Rewinder

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 9,014 posts
  • Joined: 20-August 07
  • Gender:Male
  • Location:NY

Posted 20 May 2017 - 08:30 AM

I'm not 100% sure on this, but IIRC the Mabuchi endbells are made of Delrin?

 

Once again going from an ever increasingly "iffy" memory...while working at a machine shop in the 80's I ran some parts made of both the black and the white Delrin...and maybe, (???) the black felt just a wee bit different from the white? (coulda been imagining things tho)

Just a quick look through the specs doesn't turn up anything to confirm, but then again, I haven't tried looking very hard either...

 

The Tradeship endbells are glass filled nylon...

 

I seem to remember them being made from Delrin also Tom...but my memory is an incredibly untrustworthy thing!


John Havlicek

#12 proptop

proptop

    On The Lead Lap

  • Full Member
  • PipPipPipPip
  • 421 posts
  • Joined: 17-February 06
  • Gender:Male
  • Location:Upstate NY

Posted 20 May 2017 - 09:05 AM

Ah...so...between the two of us we can be a little more sure, or a little less un-sure... :)

 

The early Mura "A" can, dark gray, endbells are also glass filled nylon...(the ones that had / have the copper clones of the nickel plated Mabuchi brush hoods)

 

Then came the "unmeltable" or "uncoughable" (un-coughable?) off white ones...phenolic as PdL has mentioned...and I believe those are the type that have occasionally been dyed black?

 

Certus dyed some of theirs blue...FWIW

 

"A brief (amateur written) history of endbells...101" lol / LOL

 

Years of reading stuff posted here in Slotblog...some of it sticks...and some of it goes away like vapor...(or perhaps acrid burnt endbell smoke)


  • havlicek likes this
Tom Hemmes
Insert witty phrase here...





Electric Dreams Online Shop