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| vtsteam:
Freezers are handy things. If you ever need to drill rubber cleanly -- like a rubber stopper, freeze it first. |
| S. Heslop:
Got a bit done today. Leveled the lathe first, or got it more level than it was, which helped reduce the taper on the turned part. Then I made a camera boom similar to doubleboost's except... junkier. I'm still working out the problems. But it still helped get some good angles for recording. Finished the motor shaft after that. It's probably the most accurate thing i've produced yet, but that's not saying much. Y'know I trapped my finger every single time I put the motor together. I was trying to prevent the thing from snapping closed when the rotors got near the magnets, but there's really nowhere good to hold on to and those magnets are helluva strong. No blood blisters though fortunately, but it still hurt! To truly finish the shaft I need to put a keyway in for the gear. But, lacking a mill, i'm thinking about just carefully drilling a hole in and using a dowel pin to spline the gear to the shaft. |
| vtsteam:
A pin radially through the shaft would weaken it quite a bit. What about drilling the shaft axially with the gear mounted at the join line, to accept a solid round pin? That would act like a square key, only round. Maybe a drop of Loctite to hold it together while drilling. Center punch on the line, mount it solidly in a drill press, and step drill to final size. -or- Can you mount a woodruff cutter in your lathe, and mount the shaft in the tool holder at the right height, to cut a square groove in it? -or- If no woodruff cutter -- make something -- even a simple small fly cutter, and feed lightly? |
| S. Heslop:
I have sometimes seen people use their lathe like a shaper, with the part held in the chuck and the tool sideways, and cutting by moving the apron back and forth with the spindle locked. I just figure it'd be awkward to make a kind of 'blind groove' that way. One that doesn't run all the way along the bar to one side. My concern with the pinned shaft was the pin being more liable to shear than a keyway, but it couldn't be any worse than a set screw. The hole would only have to be drilled as deep as a regular keyway would too, so I don't see how that'd risk weakening the shaft any more than a keyway would. Thinking about it, I might be able to do the shaper thing by first drilling a hole and using that to start the cut in. With the part held in the toolpost and a cutter in the chuck, I could probably get away with using a regular slot drill with the part held in line with the cross-slide. The only problem is that i'd have to buy a slot drill! |
| RussellT:
You could make a tool to cut a slot using a bit of silver steel - or even a broken drill bit resharpened to give a flat end. Russell |
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