Rolling ball bump tool

I originally made mine as a bump tool that could be used to bump o/d's & faces true on a centre lathe. It was suggested that I try it as a burnishing tool so I gave it a go. I intend to make a video where it burnishes a complex form - if it works..

Burnishing video, sorry about the video quality & music.

https://youtu.be/C8Smu026128?si=Kw81yawgK7CriW6E

Bump tool video, the ball is supported by much smaller ones in a spherical cup & can roll in any direction.

https://youtu.be/YJ73vtAV320?si=0q9tiuT1YEqYkTFl

Usually I am bored with the detailed how I made it videos. But I'd like to see how you captured the ball.

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Originally Posted by Ralphxyz

Usually I am bored with the detailed how I made it videos. But I'd like to see how you captured the ball.

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I used a ball transfer unit.

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Thanks Mook! We've added your Rolling Ball Bump Tool to our Lathe Accessories category,
as well as to your builder page: Mook's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-rolling-ball-bump-tool"> <img src="/uploads/261165/homemade-rolling-ball-bump-tool.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-rolling-ball-bump-tool">Rolling Ball Bump Tool</a> <span> by <a href="https://www.homemadetools.net/builder/Mook">Mook</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/lathe'>lathe</a> </div> </div> </div> </div>
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Could you please share the specific ball transfer unit that you used? I'd like to make a bump tool like yours, and I'm having trouble finding a ball transfer with that same or similar geometry - most have a much wider flange diameter and wouldn't work in this application.

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Originally Posted by flyfr8rs

Could you please share the specific ball transfer unit that you used? I'd like to make a bump tool like yours, and I'm having trouble finding a ball transfer with that same or similar geometry - most have a much wider flange diameter and wouldn't work in this application.

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This is the unit I used.

https://www.bearingboys.co.uk/Heavy-...-Unit--47775-p

If you want the tool drawing I can upload it to get a shareable link.

Congratulations Mook - your Rolling Ball Bump Tool is the Homemade Tool of the Week!

We've seen many of these lathe bump tools before, but the rolling ball adds versatility, and the burnishing capability is another nice feature.

Some more good builds from this week:

Cross Slide Linear Ball Rail Conversion by tonyfoale
Fire Hose Roller by Cypriot90
Countersink Gauge by Mook
Tuyere and Ash Gate by Frank S
Wire Forming Tool by rgsparber
Ball Turner by albertq
Pipe Clamp by orioncons36
Holdfast by Philip Davies
Charge Air Cooler Pressure Test Cap by Frank S
Rewlestone Plumb Level by Philip Davies
Forge Hood by Frank S


Mook - you'll be receiving a $100 cash prize, in your choice of Amazon, PayPal, or bitcoin. Please PM me your current email address and prize choice and I'll get it sent over right away.

More importantly - this is your 3rd Homemade Tool of the Week win!

You join these other 3-Time Homemade Tool of the Week winners: rgsparber, rossbotics, mr95gst, Paul Jones, Christophe Mineau, Captainleeward, immortalx, scorch, Brendon, Frank S, morsa, mklotz, Philip Davies, Vyacheslav.Nevolya, brianhw, kess, LMMasterMariner, Don42, jjr2001, Tuomas, olderdan, tonyfoale, bobs409, dgbreggin, Mikhandmaker, thehomeengineer, old_toolmaker, celsoari, Bellevue Woodshop, Stevohdee, Dr.Al, Kovanca Polock, Dimitris Polychronis, warsztatOdZera, Kwandotechnic, Mark Presling, Crusty, winkys workshop, orioncons36, diy creative crafts, AB-SHOP, Occasional machinist, and My MiniCrafts.

You'll notice the 3-Time Homemade Tool of the Week award trophy graphic in your postbit beneath your avatar.

https://www.homemadetools.net/forum/...OfTheWeek3.pnghttps://www.homemadetools.net/forum/...eWeekIcon3.png

Here are all three of your Homemade Tool of the Week winning tools. Congrats again :thumbsup:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/forum/blanking-shapes-rubber-die-98749#post229297"> <img src="/uploads/260562/homemade-forming-die.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/forum/blanking-shapes-rubber-die-98749#post229297">Forming Die</a> <span> by <a href="https://www.homemadetools.net/builder/Mook">Mook</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/punch'>punch</a>, <a href='https://www.homemadetools.net/tag/die'>die</a> </div> </div> </div> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/forum/milling-vice-inserts-round-material-99141#post230424"> <img src="/uploads/260782/homemade-mill-vise-inserts.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/forum/milling-vice-inserts-round-material-99141#post230424">Mill Vise Inserts</a> <span> by <a href="https://www.homemadetools.net/builder/Mook">Mook</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/vise'>vise</a> </div> </div> </div> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/forum/rolling-ball-bump-tool-99798#post232224"> <img src="/uploads/261165/homemade-rolling-ball-bump-tool.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/forum/rolling-ball-bump-tool-99798#post232224">Rolling Ball Bump Tool</a> <span> by <a href="https://www.homemadetools.net/builder/Mook">Mook</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/lathe'>lathe</a> </div> </div> </div> </div>

The tool drawing would be appreciated, thanks!

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Originally Posted by flyfr8rs

The tool drawing would be appreciated, thanks!

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Here is a link to a .DWG file - https://drive.google.com/file/d/1xEM...usp=drive_link

Tried some pattern burnishing with the tool today on this years festive candlesticks.
https://youtu.be/srBk8jEbaOE?si=SPj-HyLdNZScZ2NU

Made a 2 ball burnishing tool for the mill today.
https://youtu.be/PZ7XHXsY_no?si=Ycuw-mM-uJB83HoR

Here is part 3 of the pattern burnishing series using a single ball on a mill.

https://youtu.be/X_St-JSrBQw?si=I2BfyZe-vWtmL4Y4