centering rings

centering rings

Post by Jim Kern » Mon, 11 Oct 1999 04:00:00



Sorry, but I can't find the original post... but as I recall the
question was how to make centering rings without a drill press and do
they have to be plywood....

Why make centering rings? Just because Estes uses centering rings
doesn't mean that it's really the best way.

I would suggest just making strips of {balsa, cardboard, foamcore board
(H and under) or pine, plywood (for I and above)} that fit between the
motor mount and body tube. Much less work and stronger for a given
weight.

If you really need rings, cardboard or foamcore is more than strong
enough for anything under an H.

--
Jim K.       !When Great Britain changed to the Gregorian calendar in

--           !Sept. 14. Thinking that somehow they were being cheated
out of 11 days, people rioted. Slightly more than 248 years later,
people celebrated Jan. 1 2000 as the start of the new millennium.

 
 
 

centering rings

Post by Jim Kern » Tue, 12 Oct 1999 04:00:00


Quote:

> Sorry, but I can't find the original post... but as I recall the
> question was how to make centering rings without a drill press and do
> they have to be plywood....

Oh, I forgot. If you really want to make rings, the easy way is to take
a narrow strip of paper and wind it round and round the inside tube
'till it matches the size of the outside tube. Then, soak it with thin
CyA to make a solid ring.

Strong, E-Z and cheap.

--
Jim K.       !When Great Britain changed to the Gregorian calendar in

--           !Sept. 14. Thinking that somehow they were being cheated
out of 11 days, people rioted. Slightly more than 248 years later,
people celebrated Jan. 1 2000 as the start of the new millennium.

 
 
 

centering rings

Post by Gene » Thu, 14 Oct 1999 04:00:00


Jim, I'll tell you how I did it once. After roughing up the motor tube
and inside of the AF with some 100 grit, I mixed up some 30 min. epoxy
on a piece of mount board and spread it into a shallow puddle about, I
dunno, 8" in dia. I took 1" wide masking tape and would dip it lightly
into some epoxy a few inches at a time and wrapped it continuously
around the motor mount tube. I wrapped it until it fit snugly (took
about 10 minutes), added 2 add'l wraps, and set it aside to dry. After
setting, it was a solid, sandable, easily-bondable ring. The one inch
wide 'ring' also made for a good contact patch within the AF.