Improving the Silver Dollar

This is your place to post your restoration from start to finish. Factory built cars only. All others go in the home brew section.
Post Reply
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Improving the Silver Dollar

Post by rc garage 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 Gear CAD.JPG
worm gear.jpg
gearhed
Newbie
Posts: 81
Joined: March 14th, 2006, 7:21 pm
Location: Kansas

Re: Improving the Silver Dollar

Post by gearhed »

I just wish the input shaft was bigger than 1/4".
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage berlin »

This is the next design fault and because of the flat area it´s in the end much smaller than 1/4".
Attachments
axis.JPG
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage 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.
Attachments
sample1.jpg
sample1.jpg (66.47 KiB) Viewed 5024 times
sample2.jpg
sample2.jpg (90.91 KiB) Viewed 5024 times
Kaye
1/4 scale GOD
Posts: 640
Joined: March 8th, 2015, 9:33 am

Re: Improving the Silver Dollar

Post by Kaye »

Very interesting and good to know. I am following high quality your work.
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage berlin »

...I found two new bearings that fit the Silver Dollar and make it possible to separate the axial and radial Forces.

Notice: The direction of the high axial force depends on the direction of Rotation.
Attachments
L1160866.JPG
L1160865.JPG
L1160864.JPG
Silver Dollar+text.jpg
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage berlin »

I added a few screws and two gaskets to fill the gearbox with oil.
Attachments
1160875-01-1500x1500.jpeg
1160874-01-1500x1500.jpeg
User avatar
Mike Casey
Legacy Member
Posts: 4181
Joined: December 28th, 2004, 9:28 pm
Location: Corona, CA
Contact:

Re: Improving the Silver Dollar

Post by Mike Casey »

This is some incredible work. Keep it up!
www.quarterscalelegends.com The Awesome history of 1/4 scale!!
Kaye
1/4 scale GOD
Posts: 640
Joined: March 8th, 2015, 9:33 am

Re: Improving the Silver Dollar

Post by Kaye »

rc garage berlin wrote:I added a few screws and two gaskets to fill the gearbox with oil.
Filling with oil is a good idea. I have a Skellenger that's been modified (not by me) and filled with oil.

Kaye
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage berlin »

I think oil is much better than grease in this case. Every Time I opened a gearbox filled with grease, the grease is everywhere but on the gears...
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage berlin »

some silver dollars seems to loose oil :-)
Attachments
7-01.jpeg
7-01.jpeg (29.57 KiB) Viewed 4469 times
User avatar
Emilio
1/4 Scale Legend!
Posts: 1254
Joined: March 20th, 2014, 12:13 am

Re: Improving the Silver Dollar

Post by Emilio »

Very nice,is that your car? Photo can't be enlarged, are you saying the line goes to an oil reserve or is it for a vent?
User avatar
rc garage berlin
1/4 scale guru
Posts: 302
Joined: August 24th, 2010, 4:57 am
Location: Berlin

Re: Improving the Silver Dollar

Post by rc garage berlin »

No, it is not my car. I found this picture and wondered why there is this tube running to the point where you normally refill oil to the gearbox. In my oppinion that only makes sense when you loose a lot of oil...
Post Reply