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Clock wheel cutter
raynerd:
Thank you John - I now understand perfectly and that has also cleared up what Darren said about the bolt and not a nut. Since the cutter is sitting on the plain diameter section true to the main body of the arbour, the bolt is just there to lock it on yet won`t effect it running true... :thumbup:
Thanks... that really helped. I`ll let you know how it goes...
Chris
bogstandard:
With a single point tool as you are contemplating using, and because you are only cutting thin material, even if the tool was wobbling about all over the place, it shouldn't really matter, because the tool will be in the same position in the short arc of rotation you are cutting in.
It only makes a real difference when you have multi point tools or long distances to cut, then everything should be running flat and concentric.
Bogs
John Rudd:
Chris,
Referring back to John's sketch, Do you recall how some of the cheap slit saw arbours work? They have a stepped series of shoulders for the differing size of hole in the blade, then use a recessed washer.....
raynerd:
--- Quote from: John Rudd on October 26, 2009, 04:20:48 PM ---Do you recall how some of the cheap slit saw arbours work? They have a stepped series of shoulders for the differing size of hole in the blade, then use a recessed washer.....
--- End quote ---
John, any day previous I would have said no but I was in RDG today and coincidently picked one up while browsing in their little pots of goddies. I don`t actually own a slitting saw, it is on my "to buy" list, so this is really my first use of an arbor of any sort. Infact, as you have tried to highlight, if I would have used a slitting saw in the past I think I would have had a better understanding.
Thanks again for your input...feel like I`m getting somewhere with all this.
raynerd:
Continuing with the clock wheel cutter, I`ve posted the rest of my progress in the pictures below. I do try and take the advice given to me (although perhaps misinterpreted) and I have remade the arbor and also used the same idea for the clock wheel arbor but using a 2MT soft steel blank. Now I was much happier with my cutter arbor but with the constant interrupted cut I decided I had room to fit a M3 screw off-centre so I have also included this in the new arbor. It makes it look more cluttered but in terms of functionality, at least there is no chance of the cutter slipping.
The conversation primarily with Stew has made me think about a few things in terms of the error transferred when moving the arbor from the lathe for cutting and truing to the rotary table for cutting the teeth. One option was to mount the wheel arbor in the chuck and use a MT chuck adaptor for the rotary table to simply shift the chuck from the lathe to the RT. My adaptor I made had bad run-out and although I was prepared to pay Chronos price of £35 for the Boxford adaptor or attempt to remake it I thought the method I have used would be equally as good with limited error. Also, my chucks are bulky and mounting a chuck on the rotary table reduces available space. What I did do is shown below, putting the 2MT wheel arbor in a 3MT sleeve and mounting directly in the boxford headstock. I used an open sleeve and my intention is to pull the arbor through with a long drawbar - unfortunately, I didn`t have anything long enough so for now I used live centre (probably not best as it was pushing on the bolt) but in actual fact, it was held solid and didn`t spin just in the MT alone.
The new cutter arbor and cutter:
The wheel arbour with a 2MT in a 3MT sleeve mounted in headstock. Proded to get it roughly to size and shape it into a wheel.
..and then taken down to size. It looked to be running true using the live centre but should be more accurate when using the draw bar:
Hummm, then wondered how the hell I was going to get it all out! I went to have a look in the box that came with the boxford and found this lying next to the collet draw bar - just the job!
So this is what I have so far ... now need to harden and fine tune the cutter and then mount the wheel arbour directly in the rotary table 2MT centre
Any advice or comments more than welcome. Have I overlooked where error is going to creep in with this method, in my mind this would be as accurate as moving the arbor mounted in the chuck and shifting the chuck from lathe to rotary table.
Cheers
Chris
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