On Fri, 17 Dec 2010 16:00:30 -0600, Ignoramus30138
Just a comment. I run my machines at lower RPM and way more feed.
Looks good. I think it was about a year ago you wondered if a CNC was
something worth having and maybe you wouldn't use it enough to be
worthwhile. What do you think now?
On Fri, 17 Dec 2010 19:37:07 -0600, Ignoramus30138
If you decide to re-visit the collet plate in the future, instead of a
twist dril, try a trepan drill.
Not sure if that's what they are really called, but I've been using
them for years and calling them that, so I'll stick with it.
What is it, you ask?
...get a chunk of O-1 or A-2 or D-2 or some other flame hardenable
tool steel of a size that you have a collet for, say 1/2" dia or so...
...Turn one end to the size of hole you wish to create and drill a
hole about .100" to .125" UNDER that size...feel free to bore it iif
you like, but it's not needed to do so.
...Fire up the torch and harden the end you just worked on.
...Now, to the grinder...Grind half of the end you just hardened away.
Kinda like a tube that you sliced lengthwise. Now grind some clearance
behind ONE edge...just like a drill bit, but with just one flute.
If you want to get fancy, and you have a LOT of holes to drill, you
can put a spring loaded plunger in the center to pop the slug out.
play with it to learn just what angle you need and how deep to make
it, but it is a very useful little drill for something like your
By the way, I made a similar storage thing for ER 16 collets last
night. This time I bored each hole with a small end mill, like Jon
suggested. It worked like a charm, actually a very fast and gentle
process. No mess with stringy chips. Just 12 minutes machining time.
It was a grid of 0.64" ID holes, 3 by 5 holes, for the total of 15
Here's the code:
#<xc> = #1
#<yc> = #2
#<safez> = #3
#<milld> = 0.2310
#<frate> = 10
#<diameter> = 0.64
O<circulargroove> call [#<xc>] [#<yc>] [#<safez>] [-1/8-0.02] [#<diameter>/2]
S1 M3 M8
O<apply_to_a_grid> call [0.5] [0.5] [0.9] [0.9]   [0.02] 
One thing you might consider with this kind of project is your choice
of tool. A fly cutter or hole saw turn less material into chips, so
therfore it tends to go faster and you have less of a job cleaning
up. Also, since less pressure is required your bending problem would
be less of an issue.
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