06-06-2013, 01:05 PM
I guess I missed most of the fun, but I'd do it in the mill, with a 1.000" end mill. Yes, I know they're not perfectly "flat", but he did say "roughly" .050 deep.
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How To Counter Bore?
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06-06-2013, 01:14 PM
(06-06-2013, 01:05 PM)Tony Wells Wrote: I guess I missed most of the fun, but I'd do it in the mill, with a 1.000" end mill. Yes, I know they're not perfectly "flat", but he did say "roughly" .050 deep. Plunge cutting with an end mill scares the hell out of me. I know, I know, wuss! In actuality it needs to be 1.005" in diameter but I just thew out the 1" diameter because when boring the counter bore it can be sized to what's needed. By "roughly" I meant the depth could be roughly to the desired dimension but I do want it to be a fairly consistent depth throughout the full dimension. I'm trying to get lighting figured out for recording the boring process. All I have is a cheap LED video light and I'm having to do some trial and error to find the right place to put the light and get reasonable coverage with it. Ed
06-06-2013, 01:27 PM
Well, end mills are usually flat ended within a couple, anyway. But to get 1.050, you do need to bore it. Unless that is, you can interpolate with your CNC mill, or have a rotary table handy.
By far the lathe is the most straightforward and predictable method. Thanks given by: EdK
06-06-2013, 06:16 PM
Got'r done!
Crappy video included. I know, the RPMs are way too low and the video is boring (pun intended).  Ed 
06-07-2013, 05:43 AM
The end result is all that matters Ed - well done.
So - what is it for?
Hunting American dentists since 2015.
Thanks given by: EdK
06-07-2013, 09:47 AM
06-07-2013, 01:53 PM
Nice job Ed.....keep up the good work!
What did you end up using to make the c'bore? Thanks given by: EdK
06-07-2013, 04:18 PM
(06-07-2013, 01:53 PM)wrustle Wrote: What did you end up using to make the c'bore? The smallest insert boring bar I have.  http://www.maritool.com/Indexable-Toolin..._info.html I didn't think there would be enough clearance but there was and it worked just fine. The diameter is right on and the depth is within .003" so good enough for Ed. Ed 
06-07-2013, 05:44 PM
well dun
krv3000, proud to be a member of MetalworkingFun Forum since Feb 2012.
Thanks given by: EdK
Ed,
Perfect, the RPM are not too slow, rarely are rpm too slow nearly always too fast. That is one great job and there is nothing wrong with the video either. (It's not crappy)   DaveH Thanks given by: EdK
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