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 Post subject: Improving the Silver Dollar
 Post Posted: November 16th, 2017, 4:25 am 
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1/4 scale guru
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Joined: August 24th, 2010, 4:57 am
Posts: 120
Location: Berlin
Hallo friends of the Silver Dollar.

I just bought one. The gears were in perfect condition.
One bearing was totally destroyed. I ask myself why?

In my oppinion, the original bearing "NICE 1602 DC" is
not the right one for this application.

In an worm gear you have high axial forces espacially if you run them in Dragsters.

To handle these forces you need a Thrust bearing or a spherical roller thrust bearing
(like you can see in the third picture).

I build the Silver Dollar in CAD so lets see if we find a soultion for that problem.

Is there someone who made the same experiences or got any idea?


Michael


Attachments:
worm.jpg
worm.jpg [ 205.97 KiB | Viewed 233 times ]
Worm Gear CAD.JPG
Worm Gear CAD.JPG [ 81.15 KiB | Viewed 233 times ]
worm gear.jpg
worm gear.jpg [ 180.44 KiB | Viewed 233 times ]
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 Post subject: Re: Improving the Silver Dollar
 Post Posted: November 16th, 2017, 7:45 pm 
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Joined: March 14th, 2006, 7:21 pm
Posts: 79
Location: Kansas
I just wish the input shaft was bigger than 1/4".


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 Post subject: Re: Improving the Silver Dollar
 Post Posted: November 17th, 2017, 12:17 am 
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Joined: August 24th, 2010, 4:57 am
Posts: 120
Location: Berlin
This is the next design fault and because of the flat area it´s in the end much smaller than 1/4".


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axis.JPG
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 Post subject: Re: Improving the Silver Dollar
 Post Posted: November 17th, 2017, 12:45 am 
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Joined: August 24th, 2010, 4:57 am
Posts: 120
Location: Berlin
These are two samples what happens to this area in case of high Forces...
It is very important to use two large Allen Screws with flat end for mounting.


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sample1.jpg
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sample2.jpg
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 Post subject: Re: Improving the Silver Dollar
 Post Posted: November 17th, 2017, 1:37 pm 
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Joined: March 8th, 2015, 9:33 am
Posts: 192
Very interesting and good to know. I am following high quality your work.


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