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Tool Talk Discussion Forum

need this tool

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ROYBOY

03-18-2008 08:34:34




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I'm looking for a tool for finding the center on round stock to center punch and drill. Tks in advance.




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JoeK(WI)

03-18-2008 18:11:19




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
third party image

Yrs ago in shop class we made center finders for round stock as below,spot brazed together.Accuracy would depend on your skill and "fussiness".



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CH(upstate,NY)

03-18-2008 15:09:30




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
Take 2 1/2" dowels, drill 1/8th in hole 1/2" from 1 end of each and screw them together. Put a nail in the other end of one and cut the head off. Tape a pencil to the end of the other one. Now you have a compass. Measure the diameter of the circle and divide by 2 to get the radius. Set the distance from the nail point to the pencil point to the radius measurement. Set the nail on the edge and draw an arc across at several points around circle. Where the arcs intersect is the center.

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NC Wayne

03-18-2008 14:26:52




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
You didn"t specify if your looking for the center of the stock on the end or on the edge. If your looking to center the end you need a try square with a center head attachment. That will give you the end center of a piece of round stock by placing it in at least two different places around the circumference of the piece and drawing a line on the end at each point. The intersection of the lines will be the center of the end. If your laying the piece down and wanting the center of it that way to drill a hole for a keeper pin, etc then you need a different kind of center finder. I don"t think that tool has any specific name other than simply a center finder. Mcmaster carr calles it a "center finder for round bar and pipe. It"s on p 2227 of their online catalog at the bottom of the page. The item number is 22025A11. The easiest way to use it is to put your piece in a vice, chuck the finder in the drill and when you get the piece centered lock it down. Then remove the center finder and replace it with a bit and drill. If you can do it that way your assured of a straight hole through the middle of the piece. Hope this helps.

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Bernoulli/OZ

03-18-2008 14:04:59




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
If your stock is absolutely round (and not to big) and you have an X-Y table for your drill press, a Blake Co-Ax Indicator will help you set up an exact center to drill. I have a little over $100 in my used one.



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coloken

03-18-2008 12:20:44




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
I have one that is like a cone, about inch and a half diameter large end, center punch mounted in small end. While not perfect, it Works pretty good on shafts. Sorry no picture. OK, there must be two types..this is to find the center to drill talestock hole. Others to find center along the shaft.



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Centering tool

03-18-2008 10:33:56




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
There is such a tool. I think it's called a centering head or center finder. I'd check with a good industrial or machine shop tool supplier. They have them like a combination square but I think you can buy just a smaller seperate tool for finding centers.



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TimV

03-18-2008 09:35:46




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
As Tim B mentioned, a centering square (often as part of a combination square as shown below) is probably the most common method. Got the one below at home and it works fine if you don't need extreme accuracy.



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Tim B from MA

03-18-2008 09:08:24




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
They make centering squares. looks like an adjustable carpenter's square, but instead of the head being staight, perpendicular to the rule, it is a V, with one edge of the rule through the center of the V.

Find them anywhere fine tools (or cheap junky Chinese tools) are sold.



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No Genius

03-18-2008 08:52:13




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 Re: need this tool in reply to ROYBOY, 03-18-2008 08:34:34  
If you don't need it to be SUPER accurate, something like this might work for you, it works well to find center of stock for wood lathes.

http://www.rockler.com/product.cfm?page=688&filter=lather%20centering%20tool



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