Cylinder Square

I made this square from a piece of 2" Round 6" long 4140 Heat Treated round stock. I was over at my metal rack and noticed the piece of stock sitting there, I mark all my alloy steels for future references.
I wondered what could I make with it, So I took it to the table and sit there with it in my hand just turning and looking at it, Then it hit me, I'll make one of those cylinder squares !

I started out by sawing the stock down to 6.060" long, It was like 9", I then chucked it up, Faced both ends to about 6.015, Drilled a #5 Center drill in each end, Undercut each end .060" deep to a 1.500" Dia. Then put it in the milling machine and drilled and tapped a 1/4"-20 hole in one end for the drive, All those measurements are on the attached drawing.

Once that was all done I set up the #3 dead center in the tail stock of the lathe, I didn't remove the 3 jaw chuck because I have a hardened dead center I made for the chuck, I simply take a carbide bit and true up the 60 deg. center while it's chucked up in the lathe. Now both centers are as dead nuts as I'll ever get them. I screwed a 1/4" bolt into the drive hole of the square to act like a lathe dog and let it rest against one of the jaws of the chuck. Now I can turn the O.D. and machine both ends all at one time without removing the square from the lathe. Don't forget to grease the dead center in the tail stock.

I ground up a carbide turning tool with about a .125" nose radius and a very fine feed, Took about .005" cut to see how straight the lathe was cutting, Come to find out I had a .002" taper, So now comes the fun part ! I put a dial indicator on the tail stock and moved it .001" over and took another cut of .005", Check it and it was about .0007" out. I did this about 5 times before I finally got it to .0002". I didn't use any emery cloth or any abrasives to help true up the O.D. The large radius on the tool gave a beautiful finish and that's what I wanted, I then took a left and right carbide tool and machined each end only taking a couple .002: per pass until the ends were the same finish as the O.D.

Below are some photos
As always thanks for looking and happy machining

Doug

Click here for a free set of these plans http://www.homemadetools.net/forum/f...re-plans-46233


Attachment 3897

Attachment 3898

Attachment 3899

Attachment 3900

Attachment 3901

Attachment 3902

Click here for a free set of these plans http://www.homemadetools.net/forum/f...re-plans-46233

Hello Doug ...
Excellent workmanship and precision congratulations.
Please, what the dimensions of your granite stone.

Thanks.:hattip:

Great job Doug. That's one precise square you've got there.

Al

Doug,
This is very encouraging and proves it can be done. Now that you have an accurate cylinder square with nearly perfectly aligned centers, can you also use it to align the tailstock in addition to being a cylinder square?
Thanks for the great photos and detailed write up, Paul

Thanx Hotz

the plate measures 18" X 24"

Quote:

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Originally Posted by rossbotics

Thanx Hotz

the plate measures 18" X 24"

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Thanks Doug .. Please which is thickness?

:hattip:

Thanks Doug! I've added your Cylinder Square to our Measuring and Marking and Machining categories, as well as to your builder page: rossbotics' Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-cylinder-square"><img src="https://www.homemadetools.net/uploads/236946/homemade-cylinder-square.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-cylinder-square">Cylinder Square</a> <span> by <a href="/builder/rossbotics">rossbotics</a></span> </div> <div class="tags">tags: <a href="http://www.homemadetools.net/tag/machining">machining</a>, <a href="http://www.homemadetools.net/tag/square">square</a>, <a href="http://www.homemadetools.net/tag/cylinder">cylinder</a></div> </div> </div> </div>

This thread has been moved to the Must Read subforum. Congrats (and thanks) to Doug for making such a valuable contribution!

3" sorry Paul

Thanks Doug .. Good luck. :beer:

:hattip:

Very Cool Doug...never thought of making a cylinder standard at home but your skills and tenure makes it look easy! Liked the Dog idea too. May give this a try instead of spending bookoo bucks on one! :hattip:

~PJ

Take your time Pjs you can do it, patience is the key my friend