Mechanics and Construction > Mechanics and Construction
How to secure shafts?
Gertlex:
Seems like shaft collars would be a good bet for this as long as you don't get the absolute cheapest ones you can find. Nylon tipped set screws, or a flat on the shaft (for the set screw to sit in) seem like a good approach. Ebay has a good selection of not-horribly priced shaft collars.
If you have the capability to do threaded ends of the shaft, that's a good way, too, but almost certainly overkill.
jwatte:
--- Quote ---If you have the capability to do threaded ends of the shaft, that's a good way, too, but almost certainly overkill.
--- End quote ---
I have the option of trying a tap and die set on stainless steel, or figuring out the single-point-threading settings on the lathe... something I've never done before.
So, if "it's a bother to put threads on there" is the only reason not to do it, then probably I'll try that :-) If that doesn't work, I'll look for shaft collars and clips as options.
waltr:
Since you do have a lath available, cutting grooves for 'C' clips would be easy.
I think 'C' clips for this would work well.
jwatte:
AAAH!!!
I cut the shafts to length, and ground the edges with a millimeter of 45 degree taper.
I tried hand-cutting threads by clamping a dire to a drill press table and fixing the shaft in the drill chuck and then turning the drill by hand (with pliers to get leverage) while putting a little weight on the handle of the drill. Using SafeTap cutting oil/esther.
After 10 minutes, I had about 2 threads' worth of progress on one side of the first shaft. Man, that's tough going in 303 stainless! (I usually work with aluminum ;-)
So, yeah. Lathe. This will be my first time single-point threading, and if that also doesn't work, I'll do the groove/clips. Either way, it'll be done! (I prefer threads/nuts because I can adjust the amount of holding force/position.)
waltr:
Ok on the progress report.
Yea, SS is much tougher than just low carbon steel and many times tougher than aluminum.
Hint on cutting the threads on a lath.
Turn the thread tool upside down an run the lath in reverse.
This way the thread is cut from the smooth part of the shaft off the end of the shaft and allows time to disengage the power feed.
The normal rotation the thread tool is moving towards the chuck and if you don't disengage in time it crashes into the chuck, jams or moves the shaft in the chuck loosing the index.
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