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How To Make A Flat Bottom Hole
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12-13-2012, 12:19 PM
(12-13-2012, 11:33 AM)dallen Wrote: the way that's drawn, looks like to me that only one side of the clamp is going to actually do any clamping, or am I missing something. ? You're not missing anything. That's what I get for drawing something up hastily from memory. I drew it up quickly so it would help clarify my question. Obviously, it did the opposite.  I'll correct the drawing. Thanks, Ed 
12-13-2012, 01:07 PM
Grind a standard drill bit into a flat bottom one. I can't explain how to do it just google. If I can do it though, anyone can!
Arbalest, proud to be a member of MetalworkingFun since Sep 2012.
12-13-2012, 01:10 PM
I withdraw my question. After looking at my CAD drawing I do not need a flat bottom hole for this application. I don't know why I had it in my mind that I did need one. Anyway, thanks for all of the advise on making a flat bottom hole. I'm sure it'll come in handy some time.
Ed 
12-13-2012, 01:22 PM
Ed,
Just one thing to add take it slow and easy, with a slow spindle speed. To feel comfortable with the end mill - have a practice first on a bit of scrap.   DaveH 
12-13-2012, 01:59 PM
Sure, just as I finished hunting down this article for you. http://rick.sparber.org/emc.pdf Shows using a drill bit ground off as a counterbore.
Full of ideas, but slow to produce parts
12-13-2012, 02:39 PM
(12-13-2012, 09:19 AM)EdK Wrote:(12-13-2012, 08:30 AM)Sunset Machine Wrote: Luck out and find a counterbore that would fit? That is what I was thinking ... Christmas gift to yourself using the Enco 15% off ... http://www.use-enco.com/CGI/INPDF?PMAKA=...&PMCTLG=00 or for considerably less money http://www.shars.com/product_categories/...rbore_Sets. The interchangeable pilot sets have caught my eye lately.
12-13-2012, 02:41 PM
(12-13-2012, 01:10 PM)EdK Wrote: I withdraw my question. After looking at my CAD drawing I do not need a flat bottom hole for this application. I don't know why I had it in my mind that I did need one. Anyway, thanks for all of the advise on making a flat bottom hole. I'm sure it'll come in handy some time. I have also looked at your drawing and it cries out for a "I need to buy myself a Christmas present". But then again, you did just get a compressor so never mind. 
12-13-2012, 05:52 PM
I have a full set of flat ground drills for just such an occasion. Just drill the hole nearly to depth with a standard drill and finish to full depth with the flat bottom drill. They are super easy to make. Just grind them square on the belt sander and relieve them on the bench grinder.
Tom ![[Image: TomsTechLogo-Profile.png]](http://tomstechniques.com/wp-content/uploads/2013/11/TomsTechLogo-Profile.png)
12-13-2012, 06:05 PM
(12-13-2012, 02:39 PM)arvidj Wrote: That is what I was thinking ... Christmas gift to yourself using the Enco 15% off ... http://www.use-enco.com/CGI/INPDF?PMAKA=...&PMCTLG=00 or for considerably less money http://www.shars.com/product_categories/...rbore_Sets.  That first link is quite pricey. I think I'll purchase the individual counterbores as I need them. I have a number of projects lined up that will need counterbores so I better start my collection.Ed
12-13-2012, 06:07 PM
(12-13-2012, 02:41 PM)arvidj Wrote: I have also looked at your drawing and it cries out for a "I need to buy myself a Christmas present". Actually, I haven't bought the compressor yet. I'm still trying to figure out the logistics of getting it home and into the basement. I have until the 24th to get it at the sale price. Right now the Menards close to me is out of stock on the 60 gallon one that's on sale. Ed |
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