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| DaveH:
Nick, Coming along nicely, :thumbup: :clap: Nothing wrong with making a few design changes whilst making it. :beer: DaveH |
| Fergus OMore:
--- Quote from: MadNick on December 29, 2011, 01:16:59 PM ---Made a ballsup though and cut it a couple of mm too wide, should have paid more attention during maths at school. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- There's another question. sorry but there is! Were you using an end mill to do the slot? If you were- don't blame your maths! You should have used a slot drill ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ @Fergus, thanks for your comments. I do have a boring head and would be interested to learn how to use that to do this job. I did find a website last night where someone made a radius cutter to go on the boring bar but the pictures werent clear enough for me to see how to do it. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- All you need is to is to use a boring bar but take care to have a cutter which cuts on the outside of the curve to do a convex cut and an inside one to do the concave stuff. One of the big mistakes is forget that you are making a single tooth cutter which follows the shape of a hole saw and that the flanks of the tooth/bit must follow the circle- and give clearance. Often the best way to see what you are doing is to draw the job out on paper at full scale. Really, it is dead simple- the second time! Good Luck --- End quote --- |
| Divided he ad:
Nick, Just my thoughts on it. If you remake the toolpost I'd use the steel personally. Could lose the job and other stuff if the thread/material gives way!? Ali isn't the strongest material to thread into. The forces on the cutting tip can be quite considerable... Everytime the cutter contacts it pulls down on it a little... Over time it may work loose? I made my round tipped cutter from steel screwed together. That worked fine. (but cutting force only 1mm off the edge of the post. Not like 6-8mm on the diamond tips) I'm just not too sure on ali holding up? Fergus, Doesn't it take a bit of heavy lifting and a fiddly set up to use a dividing head/rotary table to cut a sphere? I'm sure I've seen it shown in pictures on another forum and I know I'd have had the ball made in the time it took to lift/fit and set the job up in the dividing head. I'll gladly watch a video of it if you have or know of one? Always wondered about the exact procedure for doing it with one of them? Every little bit of knowledge helps you make something else :thumbup: Ralph. |
| Fergus OMore:
--- Quote from: Divided he ad on December 29, 2011, 06:49:05 PM --- Fergus, Doesn't it take a bit of heavy lifting and a fiddly set up to use a dividing head/rotary table to cut a sphere? I'm sure I've seen it shown in pictures on another forum and I know I'd have had the ball made in the time it took to lift/fit and set the job up in the dividing head. I'll gladly watch a video of it if you have or know of one? Always wondered about the exact procedure for doing it with one of them? Every little bit of knowledge helps you make something else :thumbup: Ralph. --- End quote --- I'm all of 81+ and lifting things is an out of question thing! Consequently, I have a small dividing head( a George Thomas, from a Hemingway casting), a Vertex BSO which takes Myford collets and ER32 and a Myford set of chucks and a small GHT boring head- made from scrap, which goes onto the Myford and the mill/drill. There is nothing BIG. I have a bigger rotary table( somewhere) Actually, the even tinier rotary table on the homemade Quorn will do a hell of a lot of things. But, and this is important- Chaddock used a file which he softened and re-tempered and did all his ball handles. All in the books Cheers |
| MadNick:
Thanks fellas, Will keep you posted on how I proceed :) Nick |
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