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Ball Turner
bogstandard:
Hi Spin,
I am just half way thru making one, about the same size as yours, but I can't really finish it off yet, until I sort out my cross slide. I don't have t-slots like you lucky gents have, so I am contemplating whether I should hack into my closs slide or not. At the moment it is designed to fit onto where the toolpost sits, but it is a PITA to remove the toolpost to fit the BT on.
Bogs
Divided he ad:
There is no competition here Bernd.... The best one wins!! :lol:
Nice sturdy looking ball carver you have there Scott....
Do you know what it's largest dia ball is?
Mine seemed ok with the 50mm hemisphere for my punch off the aeolipile project... But I think that's about it's limit!
That also produced some of the most vivid blue and gold swirls when cutting and the finished hemisphere was far too hot to hold in bare hands.... or even gloves for too long! :bugeye:
I don't know if you get these issues with yours... But I cut a very shallow groove into both sides of the tool holder where the clamping screws leave there mark... This was due to forever removing burrs to get the thing to slide to the next radius setting....
Like that.
I didn't make much of an effort to spruce this one up. I was just so happy that it was finished and worked :)
I'm looking forward to seeing some of your works Scott.... I like this wording...
--- Quote ---I know there are sites with people building all sorts of thigns for a living, using high dollar machines, and ripping out incredibly complex items from a CNC machine. But honestly.. I "play" with the tools for the artisan factor. An thats what Im teaching my boys as they actually still want to hang out with me. Its not about ripping out a part. Its about crafting something. And I see this forum seems to be tailored for people who are crafting things.. not just ripping out a load of parts for an order.
--- End quote ---
I would also like to be able to live upto such a philosophy....I like one off's. I'm slowly getting there, just a few tollerance and presision bugs to work out of my system and I should be able to make things that look nice and work correctly!! :dremel:
Good to see more people posting there works.... Even if after 2 days it takes me an hour to read up and get up to date!! :jaw:
See you around the forum...
Ralph.
SPiN Racing:
Thanks guys!
I need to go see about the score marks. I have only turned a few things sofar, but it adjusts very easily sofar.
Im not sure of the type of metal my bit holder is, but its some form of rustable steel. It machined rather nicely, but I dont know about score marks. I will check after tonight's Santa Duties.
The groove is a good idea. :D
The only issue I was worried about when I made it was the torrington bearing I used. It was a thrust bearing from the front of the eccentric shaft in a Mazda 13B rotary. (I have wayy too many rotaries here) A machinist acquaintance said it would be better to simply make them fit smoothly together and loose the bearings.
I had already machined them for the bearings etc, and as it turns out I was able to stand on the thing with my 210 pounds, and spin easily on the center of it.
I used a good dose of Redline high impact grease in the bearings, and around the whole thing, and at this point it still turns very smoothly.
When under load, I was thinking.. with the rotation of the lathe, it was loading the bearing directly from above, and any angular force was going to be minimal. The load is a vertical load, not horizontal. From my eye LOL.
If I remember correctly... hmm Ok getting up my CAD drawings...
3.354" ball :D
Its 1.67 inches from the centerline of the lathe to the surface of the turner.
Actually I just popped out some Pics of the CAD drawings. I will upload em and make a post with em. :D
Thanks for the kind words everyone. My first "real" project with the lathe :clap:
SPiN Racing:
OK some cad drawings for you all.
Of course your own dimensions will vary.
Making mine, I basically went to Steve Bedair's Ball turner section, and browsed around looking at all the different designs, as well as did a lot of Google research on ball turners.. then sorta.. did what you do. Got a mental picture, and started. (I still have the first turner base part that I didnt use cause I bored it too big. :scratch:
Here are the CAD pics.
This is the base
Here is the turner
Tool holder
Complete drawing....including Crossslide (its light gray.. sorry)
Bernd:
--- Quote from: SPiN Racing on December 24, 2008, 08:47:53 PM ---I had already machined them for the bearings etc, and as it turns out I was able to stand on the thing with my 210 pounds, and spin easily on the center of it.
--- End quote ---
Now that I would have liked to see. :D
Bernd
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