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need roll pin for K&B - 7/22/2012 10:24 PM   
summerwind


 

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From: fresno, CA, USA
Status: offline 		any good sources for roll pins?

< Message edited by summerwind -- 7/22/2012 11:34 PM >

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RE: need roll pin for K&B - 7/23/2012 12:13 AM   
spaceworm


 

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Status: offline 		Although I have an early .35 rc and a couple of the early .40's with the roll pin secured prop driver, I have never taken one apart and don't know the size. Very likely it is SAE, not metric. MECOA will likely have them, as well as McMaster Carr. My True Value hardware store has some, but I don't know if they have the right size. Good luck.

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RE: need roll pin for K&B - 7/23/2012 12:16 AM   
djlyon



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Status: offline 		A good hardware store . Of course they don't exist anymore. There used to be several in the LA area. Try the net. You should be able to get one that way for about 9 bucks. 5 cents for the roll pin and 8.95 for shipping and handling.
Sorry I was no help and sorry for the sour grapes

Denis

< Message edited by djlyon -- 7/23/2012 5:13 AM >

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RE: need roll pin for K&B - 7/23/2012 12:43 AM   
summerwind


 

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Status: offline 		haha....9.95 for shipping

no sour grapes on my table.......you both pointed me to good direction...........thank you

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RE: need roll pin for K&B - 7/23/2012 1:13 PM   
coralcape


 

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Status: offline 		I have used drill bits as a substitute. Mic. yours and visit you local hardware. Good luck, red

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RE: need roll pin for K&B - 7/23/2012 4:54 PM   
earlwb


 

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Status: offline 		Yeah right now K&B is in the process of moving from their old location to a new one. So getting parts will be taking a while as most everything is boxed up and on pallets enroute to their new location.

I would suggest old drill bits, piano wire, etc as a good source to make one.

If you have a ACE hardware store in your area, they usually still have some small pins that you might be able to use.




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RE: need roll pin for K&B - 7/23/2012 6:12 PM   
spaceworm


 

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quote:

ORIGINAL: earlwb

...I would suggest old drill bits, piano wire, etc as a good source to make one.

If you have a ACE hardware store in your area, they usually still have some small pins that you might be able to use.






Roll pins are also known as spring pins and depend on radial tension to keep them in place. Unless you have another means to retain the drill bits/piano wire then they likely will fall out under operating conditions. Just my two cents worth. Good luck.

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RE: need roll pin for K&B - 7/23/2012 7:52 PM   
earlwb


 

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quote:

ORIGINAL: spaceworm
quote:

ORIGINAL: earlwb
...I would suggest old drill bits, piano wire, etc as a good source to make one.
If you have a ACE hardware store in your area, they usually still have some small pins that you might be able to use.


Roll pins are also known as spring pins and depend on radial tension to keep them in place. Unless you have another means to retain the drill bits/piano wire then they likely will fall out under operating conditions. Just my two cents worth. Good luck.


Yes you care correct, but I think the OP was talking about the small pin used on the drive washer for a engine like the old stype small front bearing K&B .40 engine. In that case the pressure on the pin from the prop beining tightened against it should keep it from moving any.  I was also trying to remember if the pin was covered up or not as well, but I forget at the moment.

update:
I stand corrected. I dug out my old K&B 40 engine and the roll pin is exposed and open so one wants a good fit for the pin so it doesn't come out. If possible one wants to find a roll pin for this engine then.




< Message edited by earlwb -- 7/24/2012 1:23 PM >

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RE: need roll pin for K&B - 7/25/2012 12:53 AM   
summerwind


 

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Status: offline 		the 3/32" roll pin as used on the K&B 40-S is/was easy to find.
the trick is to drill thru the driveplate/crankshaft.........
i'll upload a pic later tonight.

this one is of but a very few that John Brodbeck did up for a select few...the one i have is from Joe Bridi's collection that John gave him.


i really appreciate all the input from you guys.
nothing more fun than to BS about engines.

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RE: need roll pin for K&B - 7/25/2012 3:46 PM   
summerwind


 

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Status: offline 		a couple internal differences as well..........rotor is supported by a bearing, rod is machined instead of the cast that were used in the production series.

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RE: need roll pin for K&B - 7/26/2012 2:50 PM   
Four Stroker


 

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Status: offline 		http://www.mcmaster.com/#roll-pins/=iko21q



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RE: need roll pin for K&B - 7/31/2012 3:48 AM   
earlwb


 

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Status: offline 		When I first saw the thread I was thinking about this engine here that I have. It uses a small roll pin and a set screw on the drive washer. I had forgotten about the rear intake engines you depicted.





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RE: need roll pin for K&B - 8/1/2012 3:42 AM   
summerwind


 

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quote:

ORIGINAL: earlwb

When I first saw the thread I was thinking about this engine here that I have. It uses a small roll pin and a set screw on the drive washer. I had forgotten about the rear intake engines you depicted.






yes they did use the smaller pin............bearing changes are tricky with the way K&B did the front ends, and the 40S is no different except they went to a larger pin since the shaft became 3/8" OD from rear to front.

i also have several of these 40RR's which are going to become popular with FF events in the "slow gas" event.
same pin as your FR...........

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