Sprocket sleeve question

what type of material for the shaft collar can we use so that the spocket does not move on the gear shaft

As in a spacer? As long as it is not explicitly disallowed, your choice. (And I can’t find any type of metal or plastic that isn’t allowed, provided that it doesn’t cost too much.)

Yeah, as a spacer. So you could just use a piece of plastic tubing or something of the sort? (*As long as it isn’t disallowed…)

Yep. Got PVC? If so, you can use it. Or some metal tubing if you wanted.

Yes! Metal tubing might be a bit out of our league, so we’ll stick with the PVC. Thanks for the help!

with the new kit, the sprocket fits the shaft and just needs a key. if you need a spacer – called a collar, I recommend metal tubing. measure your ID and OD to get your total difference, divide it by two to get the collar wall thickness. find the proper tube thickness or make it, then cut a slice out of the tube to make your ID match you shaft then assemble.

Yes, we have the key, but we’re a little worried it won’t hold, so better safe than sorry. What are the pro’s for the meal tubing as opposed to plastic? As a rookie team, we really want to consider all our options. Excuse me, but what are ID and OD, please? (As I said before, we represent the word ‘rookie’ in all of it’s forms!)

if the outside diameter (OD) of the shaft is the same size as the inner diameter (ID) of the sprocket, then there is no room for a collor or sleeve to fit in-between the two. The key fits into both and locks them from turning relative to each other. This is by far the best way to make the two mate together without slipping. if you need to make the sleeve, use metal on a drive spocket. the plastic will undergo to much force and will deform, fail, and slip. You can use a plastic sleeve if it is just a wheel to an axel or something.

good luck.

Oh, ok. Thank you for the help!

I just found your post on metal sleeve being out of you legue. Don’t give up without a fight. you must be able to do this type of thing – pick a guy and assign him to it.

We’re a little nervous, but if we’re going at this full speed ahead, we’d better try it out. Again, thanks!

ID is Inside Diameter, OD is Outside Diameter. (For example, a ringer has an ID of 13 inches.)

My former team (1293) used metal spacers (of unknown origin) on the kit frame at the axles and PVC at the output shaft of the older kit transmissions*. Really, I didn’t notice any particular advantage of one over the other. The metal tube we used was smaller and probably lighter than PVC, but PVC’s cheaper and leaps and bounds easier to cut. Basically, use whatever’s handier for you.

*I’m not sure what the recommended practice is for this year’s transmissions.

So basically, it’s all a matter of what sort of resources you have to draw from and of your personal preferences. Cheap would be a preference for us, though. Thanks Billfred

Metal spacers are actually not too pricey. Just go to your local home improvement store and buy some metal tubing that fits. It can be cut with a tube cutter, hacksaw, a miter saw, and many other tools. However, I wouldn’t recommend using a hacksaw, it is too easy to make a inaccurate, angled cut. We used aluminum pipe from Home Depot cut on a miter saw along with some plastic washers to hold our wheels in place in '06 and they held up fine as well as being pretty easy to make. We’ll probably do the same thing this year.

We’ve used anything from plastic pipe to bronze thrust washers or bushings (cheap) to shaft collars. One time, a plastic cigar tube happened to be the perfect fit. At the end of a shaft, or for precise positioning, shaft collars work nicely. They are relatively inexpensive at MSC, and are available in aluminum or steel in one- or two-piece designs. I highly recommend having some around.

MSC shaft collars (starts on page 3817) http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=3817&PARTPG=N2DRVSH&PMT4NO=16579804&PMITEM=87856829&PMCTLG=00&PMT4TP=*LTIP

various bushings and washers (starts on page 3772) http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=3772&PARTPG=N2DRVSH&PMT4NO=16580157&PMITEM=35375088&PMCTLG=00&PMT4TP=*LTIP