Re: Star Blast bearing failure

Hi Greg,
Well, Orion just might send you a new one, but then will the new one repeat the failure is the question?
If you were to replace it yourself, then a ball bearing will work fine. A ball bearing will take load forces in two directions and a needle bearing is made to take just pressure from the top, but it hold more uniformly to the track.
Either one will work, but the scope is light so a ball bearing might be the better choice.

Hi Greg,
I would think the Nylon would make it very smooth and perhaps not to prone to rolling away on you. Nylon is very durable and resists wear. Not sure why they would only offer them that way though.
I would say you did the right thing ordering both bearings, that way you have options.

Greg, was the part number 6655K16? If so, all the bearing surfaces are hardened steel. The bearing is actually three separate parts, unlike a standard radial ball bearing. There are two flat washers which are the bearing races. Between them are the balls, which are contained in a small nylon disc. The balls are free to rotate, but they cannot fall out of the disc. The nylon disc does not bear any load, so it will last forever in this application (the bearing is rated for 33 lbs at 2500 rpm). You said you also ordered a needle thrust bearing. Did you also get the two bearing washers with it. They are sold separately for this part (the 6655K16 bearing includes the washers). Neither bearing can be used without the washers. If you have both complete sets, try each one and use the one that,s smoothest. If it's a toss up, use the needle. Post some picks of the alt assembly if you can.
Joe P.