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  #1  
Old 03-17-2011, 09:29 PM
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Default Lack of balls

Today started out grey and shitty with above freezing temp and lots of fluffy, wet, global warming.
This means it's warm enough in the old shop that the florescent lights will work.
I just made a new handle for my geardrive drill press in the last warm spell, and it needs balls on it.

And even little Charlie has a ball cutter attachment.

So I decided to get at it. I am basically adapting Steve Bedair's design, but it is too small so the measurements are my own. So I had to dig out the disk brake, and tram in the mill, turn up Walter Trout on the computer, and make chips.

#1&2 I had cut the pieces yesterday and my nose was running and I decided I was insane so I quit. Here is a piece of 5" and a 1.5" chunk of 3" stock.
#3 Today I did the machining. Here the base is faced off and the register for the pedestal is machined.
#4 the piece of 3" pedestal stock is cleaned up and dialled in on the mill.
#5 I mowed a slot .750 deep in the pedestal.
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  #2  
Old 03-17-2011, 09:42 PM
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#6 Finished the slot to .875 wide. It was going to be .75 wide, and then I found out my 3/4 plate is froze in under a snowbank somewhere, and I have a chunk of 1" hotrolled inside. Soooo....
#7 Cutting recesses for the setscrews...
#8 and recesses for the Allen head mount bolts.
#9 Completed to this point. It doesn't show in #9, but I recessed a 3/8x24 Allen head bolt in the center of the pedestal slot, and threaded it into a blind hole. By careful grinding of the bolt length, I got it to the point that the pedestal rotates snugly without binding, and the capscrew is tight.

Now manana, I will make the tool holder.
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__________________
Gerry
“After all, no one is stupid enough to prefer war to peace; in peace sons bury their fathers, and in war fathers bury their sons.”
Herodotus

Even duct tape can't fix stupid ... But it can muffle the sound. Attributed to Red Green
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  #3  
Old 03-17-2011, 09:51 PM
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looking good.

I found that Charlie's base is not big enough around to allow for cutting inside radii. The stock grabs the cutter and locks down.
That's why the handle on the grinder quick-release didn't get finished.
I think I need a 4 - 5 inch round to redo it.
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  #4  
Old 03-17-2011, 10:09 PM
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Quote:
Originally Posted by cutter View Post
looking good.

I found that Charlie's base is not big enough around to allow for cutting inside radii. The stock grabs the cutter and locks down.
That's why the handle on the grinder quick-release didn't get finished.
I think I need a 4 - 5 inch round to redo it.
The toolholder will be an L shaped piece of stock with a slot milled in it for the toolbit. I figure it will be able to cut a 3" ball...in case I get the urge to make a trailer ball
Reversing the toolholder in the slot will give me about a 6" radius.

I may have to rethink this, and machine another handle position for inside radius cutting.
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Gerry
“After all, no one is stupid enough to prefer war to peace; in peace sons bury their fathers, and in war fathers bury their sons.”
Herodotus

Even duct tape can't fix stupid ... But it can muffle the sound. Attributed to Red Green
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  #5  
Old 03-17-2011, 10:21 PM
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What is causing the problem I'm referring to, Gerry is when I reverse the cutter in the holder and turn the thing around, it multiplies the leverage because the L-shaped holder is facing in the opposite direction from ball turning.
So it lets the whole thing flex under the load, then the cutter falls below center; it grabs and the party's over.
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  #6  
Old 03-17-2011, 10:26 PM
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Rod, could you machine a keyway into the L shaped holder, and one in the pedestal, say 1/8 keyway and make it a press fit into the L piece, that would prevent it from leveraging down.
Or....use those setscrews with a round dowel tip that stick out past the thread, and have them engage the keyway in the L bracket and bottom in the bracket to hold it.
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“After all, no one is stupid enough to prefer war to peace; in peace sons bury their fathers, and in war fathers bury their sons.”
Herodotus

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  #7  
Old 03-18-2011, 06:38 PM
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Well, today was awesome sunny, and I got the mill fired up again. After thinking about what Cutter said, I decided to employ my suggestion of a keyed tool holder. I needed to cut a keyway .110 wide and .90 deep. I have a bunch of cheesy 1/8 shank 3/32" end mills, and no collet smaller than 1/4". I solved it by using an inch or so of 3/8" ground shafting I had, and drilling it on the lathe to 1/8," and then used locktite to hold the endmill into the sleeve. Then I could grab it in the 3/8 collet and cut the keyway.

#1 here is the roughed out tool holder
#2 the home made 1/8" adapter.
#3 the keyway
#4 How it fits the setscrews
#5 the finished product. It's as finished as it's going to get, because I lack the 1/2 rod to make a handle, and the 2 allen screws that hold the base to the lathe. Next time I go to the city I will pick up the goodies to complete this project.
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__________________
Gerry
“After all, no one is stupid enough to prefer war to peace; in peace sons bury their fathers, and in war fathers bury their sons.”
Herodotus

Even duct tape can't fix stupid ... But it can muffle the sound. Attributed to Red Green
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  #8  
Old 03-18-2011, 10:13 PM
wooleybooger
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looks good. what size lathe do you have? Im trying to size one "up" for a 14" because the plans Ive found are all for 6-10" lathes.
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  #9  
Old 03-18-2011, 10:26 PM
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Gerry,

Great post great title. Know a guy that works for a railroad. He had to do a presentation on trailer hitches for pickups for the company. The title, "Know your balls" did not pass the powers that be. "Know your hitch balls" did.

Scott
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  #10  
Old 03-18-2011, 10:32 PM
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Gerry, that was probably worth doing but I must have not made myself clear.
I think my problem is the footprint of the turret is too small.
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