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Front Spindle Taper


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#1 Timehunter OFFLINE  

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Posted August 21, 2014 - 06:26 AM

I am rebuilding a Jim Dandy PK 1612.

I am putting different tires and hubs on the front and have to turn down (make) some

   new spindles.

The taper on the spindles where they go into the "steering legs?" is what I am having

   a problem with.

The old spindles look to be around 3 degrees taper and the holes in the legs look to be around

   5 or so degrees taper.

Something is not right somewhere.. "usually me!" .....So......

Does anybody know what the degrees of taper on the spindles and legs are really

   supposed to be????



#2 Username OFFLINE  

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Posted August 21, 2014 - 07:57 AM

They could be hogged out if they became loose and were run for very long.They also had problems from the factory with using worn tooling.



#3 LilysDad ONLINE  

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Posted August 21, 2014 - 09:51 AM

I agree with Username, it sounds as though it wore that way. I would think if they were made tapered like a Morse Taper on a drill bit that it would stick/seize together.

 

I would suggest boring the axle out and bushing it back to standard. A needle thrust bearing installed between the spindle and the underside of the axle bore will improve steering effort.

http://www.mcmaster....earings/=tdkwcy


Edited by LilysDad, August 21, 2014 - 09:57 AM.


#4 Timehunter OFFLINE  

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Posted August 21, 2014 - 01:05 PM

What I called the "steering legs" could be called the king pins.

Those and their bushings are o/k along with their thrust bearings.

The spindles that your front wheel hubs fit on is what I am making.

They do come with a tapered fit into the "king pins", or "steering legs"...

They are bolted to them .

Where they are bolted...the spindle tapers down from 3/4" to 1/2".

Guess I will have to look up the formula or..???...because the way I am measuring

   the taper......something doesn't work out between the two..



#5 Bill 76 ONLINE  

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Posted August 21, 2014 - 03:14 PM

I don't know what taper they used,But if your machining new spindles just find a taper you like such as a 7 degree ball joint reamer and ream steering leg to that size and machine your new spindles at 7 degrees to match.

 Taper is measured by taper per foot in inches------7 degrees taper is 1 and 1/2 inches per foot.    


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#6 Timehunter OFFLINE  

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Posted August 26, 2014 - 05:26 AM

Finally got em done!

Here are a couple formulas for future reference if anyone needs them...

To find taper...Take the large diameter and subtract the small diameter from it,

   take that number and divide it by the length of the taper,..then multiply the

   quotient by 12.

To find angle in taper per foot....

   Divide taper in inches per foot by 24, then find angle corresponding to the

   quotient, in a table of tangents, (sine,cosine,tangent),

   then double this angle....

Made my head hurt!!!


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#7 Alc ONLINE  

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Posted August 26, 2014 - 05:33 AM

Glad to hear you got them figured out , will be looking forward to pictures of them






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