You can get the drawing I built this from in
PDF
format.
You'll need Acrobat 4 or later to print it. It is sized for
A4 paper and should print just about real size on any Laser printer.
It's not all that critical as you adjust the fingers to suite the work anyway.
There is also the original TurboCAD V5 for Windows version. I tried exporting to DXF but TurboCAd doesn't do that usefully. Don't just click, RIGHT click and select 'save as' to save the file to your harddrive. |
I have a few projects planned that require long thin rods to be turned and threaded. Not having got a travelling steady with the lathe, I had to design one. (Yes I know Myford still sell one, they're in England, I'm in South Africa, and the UKP costs me far too much with our Monopoly money value (15.8 Rand to the UKP 24 April 2002) After looking around the web I came up with a basic shape and after looking in my scrap box I came up with materials (well actually my father came up with the ali plate). The frame is half inch aluminum plate and the fingers are 9x50mm brass bar of which I have a short piece (seems to be extruded).
The preliminary fotos below show the plate having been cut on the bandsaw shown and then filed to a nice-ish finish.
23 Apr 2002
It is now complete and the fotos 5 to 8 show the final stages. I did not have the
camera handy for the slotting operations, sorry, but the setup is much like that
shown on the 'toolpost' page
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The steady and the waste cutoff with the bandsaw. The pattern was made using TurboCAD and printed on an inkjet, then cut and glued using 3M fotomount spray. I found that the usual wood or paper glue makes the paper stretch too much and comes loose too soon. The fotomount is pretty good but the paraffin (kerosene) I used on the file has made the edges come loose a bit. Last edited February 20 2013 09:55:58.
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Showing the filed curve of the steady and the bandsaw cut on one of the scrap pieces. Last edited February 20 2013 09:56:00.
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Showing the bandsaw used. This is an eastern copy (but an old one) of a Rockwell Delta design. I have seen the original Rockwell Delta and that's how I know. I put on a new blade prior to cutting the ali as the old one was kinked when a bit of wood grabbed. No speed control, no special blade, but I did 'lube' the blade with beeswax rubbed on each side. It cuts the ali smoothly and easily. The only issue was the inner curve of the steady as it makes a narrower kerf than in wood. Last edited February 20 2013 09:56:00.
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A closeup of the retaining bolt, 1/4BSF or 1/4-26tpi if you like. You can see some of the remaining thread from the 8mm bolt it was made from. I used the bolt so that I already had the hex head as I don't have any hex stock and filing 6 flats seemd like too much effort at the time. Factory made bolts are in no way 'centered' and so the vestiges remain on one side. Also visible is the 'tooth' I filed in the first thread so that it self cleans the mounting hole. That hole is exactly where it will get the most crud in it from normal turning operations! I might make a short 'bolt' with a thin flat head to keep it covered. Last edited February 20 2013 09:56:03.
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Showing a finger slot 'milled' using a Ryobi woodworking router. Bit was a 6mm tungsten carbide running at 26000rpm. Last edited February 20 2013 09:56:03.
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This shows the routing table edge on with the router (blue) underneath it. Last edited February 20 2013 09:56:04.
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The Final Form. I turned a bit of 3/4" aluminum so the end would fit the drillpress chuck, then glued a piece of plastic sponge (weatherstripping type stuff, 1/2" thick) to the end, and then a piece of 400 grit wet or dry paper to that. Ran it fairly fast, dry (but maybe wet with kero would be better). To do the surface I found I had to first run over the whole surface with a light pressure just to clean the surface up, and only after that could I put the decorative spots on. In doing that I notice that the center tended to make ridges rather than smooth swirls and then foudn that if I moved the material around, sort of a wobble of 1/32 to 1/16" it would then make a clean whirl right to the center. Of course, wobbling it like that was not so easy to get right each time so there is some variation in the whirls. Also, next time I will shape the sponge so it exerts more pressure in the center where the speed is lower. I think that will help. Last edited February 20 2013 09:56:05.
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These images were taken with a Sony Mavica FD73 and are not as good as I would wish.
I'm still learning the cameras requirements and of course it's not a patch on the
FD95 I've used previously. First off I'll need some sort of flood light as the
workshop lights are just not enough it seems.
(and I need to make a support for
the flood light too! at the rate I'm finding new things to make I'll have to retire
at 40 to get them all done before I'm 120)
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As thy days, so shall thy strength be Deuteronomy 33:25
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