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1/2” steel ball source?


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#1 Swarfmonger

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Posted 25 July 2020 - 07:31 PM

Hello all, has anyone by any chance found a source for machinable half inch steel balls to make the elevation screw with per print? The only ones I have found so far that claim they are machinable are 60RC when you read the fine print, yikes! If I can’t find any I suppose I will switch to Plan B and get out the ball turning attachment. Thanks!

#2 bruski

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Posted 26 July 2020 - 12:22 AM

I used the brass ones from MSC Co.

 

bruski


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#3 Sparky_NY

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Posted 26 July 2020 - 05:08 PM

I used the brass ones from MSC Co.

 

bruski

I heard the rumor that Bruski had brass balls, but now its confirmed.


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#4 bruski

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Posted 27 July 2020 - 02:45 AM

Mine are quite a bit bigger though. :-P

 

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#5 rayhawk

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Posted 27 July 2020 - 01:54 PM

I bought the hardened steel one from mcmaster-carr, and just reamed the acme rod for a press fit.


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#6 brk

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Posted 28 July 2020 - 11:51 PM

I used a 1/2" construction ball, Carr Lane has them, Jergens probably too.

 

I drilled and reamed the elevating screws for the 1/4 shank and silver brazed it in.

 

Here is a snip from Carr Lane's web site

 

 

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#7 brk

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Posted 29 July 2020 - 12:01 AM

I also added a slot down the length of the acme screw and made a brass finger to engage it to keep it from turning.  Here are a couple photos, one with a flash to help show the groove.

 

I have a thrust bearing under the brass piece that is under the finger.

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#8 Swarfmonger

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Posted 29 July 2020 - 06:26 PM

Thanks for the pics brk! I like the tooling ball idea and I’m betting I’ve got one already that would work well in my stash of them.

#9 Larryx

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Posted 01 August 2020 - 11:46 PM

I apologize for being the stupid one here but if the finger keeps the shaft from turning how does the up/down thing work?



#10 Swarfmonger

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Posted 02 August 2020 - 03:11 AM

I apologize for being the stupid one here but if the finger keeps the shaft from turning how does the up/down thing work?


The wheel and the threaded bushing both rotate and the screw remains stationary.

#11 Larryx

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Posted 02 August 2020 - 08:07 PM

Got it. Thank you.






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