PDA

View Full Version : Quick Ball turning tool idea



tbadger
11-08-2010, 02:45 PM
I needed a few small balls turned for a project and couldn't wait for something to be ordered and sent at great expense. The balls were only 1/2", so having looked at all the possibilities, I came up with a quick solution using my small 3" rotary table.

I removed the cross slide on my HF 7x10, and drilled and tapped a hole for mounting the rotary table.

I quickly machined a crude insert holder and mounted it on the rotary table. From there, it was about 8 min. to a finish ball. For the most part, I'm pretty happy with the finished product, and when time permits, I plan on building a better mouse trap...


http://www.mefixitmyself.com/pics/TAB_8474.JPG

http://www.mefixitmyself.com/pics/TAB_8475.JPG


http://www.mefixitmyself.com/pics/TAB_8486.JPG


http://www.mefixitmyself.com/pics/TAB_8491.JPG

brozier
11-08-2010, 03:14 PM
Brilliant! That is so elegant. :D

Cheers
Bryan

lynnl
11-08-2010, 03:21 PM
Brilliant! That is so elegant. :D



Absolutely agree!

I salute you tbadger.

dockrat
11-08-2010, 04:45 PM
Now thats thinking outside the box!!! Good on ya!!!

Edit to add......Welcome to the zoo

Alistair Hosie
11-08-2010, 05:07 PM
Brilliant sometimes the most obvious simple things are the hardest to imagine, well done.Alistair

Bill Pace
11-08-2010, 05:11 PM
Well, it quite obvious that you just ignore all the nay-sayers that run on about the little bench top lathes - and go ahead and create neat stuff anyway...

There must be dozens of ball turning gizmos, but theres always another way to do it, as you have just shown us! As the Aussies say "good on ya"

2ManyHobbies
11-08-2010, 05:15 PM
Nice work. If I did that, I'd be looking at the tool in 6 months wondering if I had attempted an internal threading tool. :D

Gravy
11-08-2010, 06:02 PM
Another vote for "Brilliant"!

And welcome to the forum! Great first post. (Ya know you've set the bar pretty high for your follow-up, right?)

Walter
11-08-2010, 06:03 PM
Love a great way to deal with a situation. excellent way to do it too it!

Oldbrock
11-08-2010, 08:44 PM
See. I told you on another post that the day is lost if you don't learn something new. Good idea. Peter

Your Old Dog
11-08-2010, 09:41 PM
Great idea and great first post and with pictures too !

welcome to the board, keep your camera batteries charged !!

tbadger
11-08-2010, 10:48 PM
Well, it quite obvious that you just ignore all the nay-sayers that run on about the little bench top lathes - and go ahead and create neat stuff anyway...

There must be dozens of ball turning gizmos, but theres always another way to do it, as you have just shown us! As the Aussies say "good on ya"

I've been waiting for an atlas or south bend to drop out of the sky, and so while I wait, I do what I can do with what I have, and continue to ignore the nay-sayers, and avoid having to ask my wife for more :D

tbadger
11-08-2010, 10:52 PM
Another vote for "Brilliant"!

And welcome to the forum! Great first post. (Ya know you've set the bar pretty high for your follow-up, right?)


Unfortunately yes :( - I'm sure that I could have started a little (s)lower with a good question or two - there are plenty of pretty sharp people here to learn from.

gr8life
11-09-2010, 12:39 AM
Nice job. Just thought I would post some pix of a modification I made a few days ago. I made this ball turner last year, I think the plans were in HSM. I have a number of ball turners that I use for various jobs. I like this one but it was not robust enough to take big cuts on things like 1 1/2 in. or larger stock and I often need to round the end of a shaft, not make a full ball. So I had some round carbide inserts that I made a holder for and they work great.
thanks
ed
http://i461.photobucket.com/albums/qq336/gr8lifeLV/Ball%20Turner/100_0412.jpg
http://i461.photobucket.com/albums/qq336/gr8lifeLV/Ball%20Turner/100_0410.jpg
more pix next post

gr8life
11-09-2010, 12:41 AM
More pix
http://i461.photobucket.com/albums/qq336/gr8lifeLV/Ball%20Turner/100_0413.jpg
http://i461.photobucket.com/albums/qq336/gr8lifeLV/Ball%20Turner/100_0414.jpg

tbadger
11-09-2010, 01:07 AM
Nice job on the up and over style ball turning jig. Of all of the various designs, I like this style the most, particularly one that can be used on a QTP and quickly exchanged for other tools.

Since I've made my own QTP, I'm looking to build an up and over style ball turning jig that offers a greater range of ball size. I'll probably use a standard boring tool as the cutting bit, as I have plenty of them to use.

IanPendle
11-09-2010, 01:24 AM
Hello gr8life,

I like your ball turning attachment and the clever use of the round insert. Can you tell me the function of the two knurled brass screws on the top surface of the QCTP holder block? They look as though they are for clamping - but I can't quite work out why you would want to clamp - maybe I'm just being dim?

Rgds. Ian.

gearedloco
11-09-2010, 01:29 AM
I've been wondering if one couldn't simply loosen the compound and manually swing it to turn a ball. I've been thinking of trying it, but I fear I may get an arm ripped off, destroy my lathe and the garage it lives in, cause the Earth's Magnetic field to flip, or maybe make our universe invert into a black hole. Or worse!:eek:



Like, if something that simple would work, why haven't we heard of someone doing it?:confused:

Thoughts?

-bill

S_J_H
11-09-2010, 08:43 AM
Bill,
that idea has been used for many many years.
Set it up right and it works very good. There may be some lathes that it won't work on though.

Steve

gr8life
11-09-2010, 02:16 PM
Ian the knurled brass knobs are threaded in and allow me to keep the shaft oiled. I should have used oil caps but had none on hand so these will keep the chips out.
thanks
ed

IanPendle
11-11-2010, 12:50 AM
Hello gr8life,
Thanks for your reply. A couple more questions. What is the diameter of the shaft which runs through the QCTP block (the one that you made provision to oil)? Would the inclusion of some sort of stop(s) to limit rotation be useful, or are they not necessary? Thinking of making one and your experience would be helpful.
Ian.

Black_Moons
11-11-2010, 01:22 AM
Hmmmm I wonder if my rotary table might fit behind the work on the cross slide verticaly.

TGTool
11-11-2010, 10:18 AM
Just thought I would post some pix of a modification I made a few days ago. I made this ball turner last year, I think the plans were in HSM. I have a number of ball turners that I use for various jobs. I like this one but it was not robust enough to take big cuts on things like 1 1/2 in. or larger stock and I often need to round the end of a shaft, not make a full ball. So I had some round carbide inserts that I made a holder for and they work great.
thanks
ed


Great idea and nice implementation. It's nice to see ideas extended and improved.

gary350
11-11-2010, 10:58 AM
I like this idea a radius cutter is something I have been needing for many years.

How do you get it set for the correct radius?

If you need to take another .005" off the part how do you do small adjustments like that?

TGTool
11-11-2010, 11:51 AM
IanPendle, the original design has provision for two stops, one for centerline and the other for the limit on the other side. The rotating shaft is 3/4" diameter.

Gary350, There's a screw and dial for setting the amount of cut being taken off. To set a precise diamter you'd turn a cylinder to the size needed, crank the cutting tool down to touch the surface and make note of that number, then back off to start whittling down and stop at the noted position. That's assuming at least a hemisphere. If doing only a partial radius to a precise size you could use the same process in two steps with a little introduced uncertainty for swaps and setup changes.