[Spridgets] Handbrake rods

[WeslakeMonza1330 at aol.com]

OK thanks.  I had planned to buy an M6 stainless steel Clevis jaw (?)  to 
replace the steel one on the steel rod.  However, the M6 threaded Clevis  jaw 
also has an M6 hole and I need the hole for the linkage on the brake drum  
handbrake to be 5/16 (about 8mm).
 
So, it appears I either need to make a Clevis jaw or find someone else to  
make me one or a combination of both.
 
The problem with my making the part is that I don't have a pillar drill let 
 alone a lathe so drilling a hole centrally and straight into a 16mm piece 
of  square stainless steel bar so I can tap it M6 will be a challenge.   
Likewise drilling a hole 5/16 for the clevis pin will also be a challenge.   
Now that I have to make/get someone to make the Clevis jaw I regret going the  
metric route which I went down because it enabled me to buy an off the 
shelf  clevis jaw - duhh.
 
I might drop my local jobbing machine shop next Friday morning to see if I  
can get the bar drilled as a quick and cheap cash job or failing that 
re-visit  my 'budget plan' to see if I can buy a pillar drill and clamp which I 
guess  won't be the full floor to standing height drill I really wanted.
 
Regards
 
 
Daniel
 
 
In a message dated 16/12/2016 21:34:29 GMT Standard Time,  
spridgets at autox.team.net writes:

Daniel-Assuming a yield strength of 35ksi (typical for  304SS,18-8SS), The 
approximate yield point of load application is around 1100  lbs/in of 
thread. I'm referencing some work that I just did on #10-32 threads  which are a 
bit smaller than M6. Assuming that you have a 10" lever arm on the  handbrake 
handle (guessing here), that would require ~110 lbs of upward force  
applied to the handle. This assumes no drag and no additional leverages (which  
there are of both). Cold rolled steel ( your average steel for such things)  
has a yield strength of 45-65 ksi, which means the cold rolled will yield 
with  ~130lbs of upward force, therefore, if you increase your engaged, 
threaded  length of SS rod by 30+% over the stock CR steel, you should be fine.


 
Mark  Haynes

It only goes one way-Pay It Forward  




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