The Shop > Tools
My ideal solution
bogstandard:
Thanks Don.
I have now got a bit of a dilemma, my new four jaw is twice the size of my old one, so the holding fixtures will need to be twice as big. The one shown wasn't that shape for any other reason than that it was the first bit that I grabbed from the recycle bin, that was big enough to do the job.
Drill a hole the same size as the bit you want to hold, put a hacksaw cut into the side, so that it grips the part tighter as you tighten the jaws, maybe a spot of superglue as well, to stop the part moving when you are handling the holding jig, job done.
John
Darren:
Thanks John,
Really appreciate these "how to" posts.
Bet that 4 jaw took a bit to set up "just right" with such as small pin, esp with it doing the clamping as well.....
bogstandard:
Darren,
I didn't really mean to turn it into a how to post, I had been doing that on another site for over a year, and didn't really want to repeat what I have already shown elsewhere.
This group has a lot more potential than being turned into another model engineering site.
John
Darren:
I understand John, but it's the method that has value here.
I mean, the principle can be scaled up or down for various other applications, not just models.
Lets say someone had a fine finish on a part that they didn't want to damage by holding in the chuck, maybe even a milling knee shaft repair this would work just dandy.
Darren
bogstandard:
Darren,
Remember your visit, and the brass shimstock.
That is perfect to prevent jaw bruising, as is ali drinks cans cut up with a pair of scissors, but neither will prevent bruising if you give the chuck a white knuckle tightening. That is the time to make a holding fixture.
I remember when I was asked to refurbish a Mamiya/Manix surface mount machine. So I duly ordered 100 very small high precision vacuum pick up nozzles to be made (at very high cost), from a local 'high precision' machine shop. They were absolutely perfect on size and finish, except for three bruise marks on the tail end of each one, where they must have let the apprentice use a 3 jaw instead of a collet for the final hand finishing. Of course they were all remade perfectly, at no charge.
John
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