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| S. Heslop:
Tragically I don't have a boring bar, i've never had to bore anything too big and deep yet. Plus I feel a fly cutter would make a pretty wide 'scoop' that would remove material from where i'd rather keep it. I appreciate the suggestions though, but I feel the shaper thing would work best with what I have available right now. |
| vtsteam:
Well it will be cool to see you do it that way! :coffee: |
| tom osselton:
We did the shaper thing in school way back when on a external thread for jackstands it worked fine on a whole keyway, I would suggest a hole drilled at the start and end of the keyway otherwise the end will be a bitch to clean up the chips have no chance of breaking off clean if you don't. How hard is the shaft? |
| S. Heslop:
--- Quote from: tom osselton on June 26, 2014, 02:19:03 AM ---We did the shaper thing in school way back when on a external thread for jackstands it worked fine on a whole keyway, I would suggest a hole drilled at the start and end of the keyway otherwise the end will be a bitch to clean up the chips have no chance of breaking off clean if you don't. How hard is the shaft? --- End quote --- It's just EN1A steel. I've had trouble with silver steel fatiguing in the past so I thought i'd just try a more regular old steel for this one. |
| S. Heslop:
Alright! The shaper thing kind of worked. There were plenty of problems with the method though. For starters, the toolbit was digging in due to the backlash on the cross slide, which made the part slip in the chuck jaws a few times (it was held in without any shims to protect the finish since I find that tends to muck up the alignment). I had to use a 1mm thick tool shimmed to various heights to cut the full width. The two relief holes I drilled were also kind of small. I figured i'd need to drill holes wider than the slot, but I didn't drill them wide enough. This made it hard to get the cut started and the slot ended up being a slope. The results were messy but they seem to work. The key was filed from a round silver steel bar. It's pretty hard as is, and I'm not sure if it'd be worth trying to harden it further. The slot I cut was pretty shallow but hopefully it'll be enough. Can't be much worse than a pin would've been! I also built the world's laziest spindle lock to keep the spindle from rotating. It works terribly but it was enough to keep the chuck steady during this. |
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