26816Re: [GrizHFMinimill] How would I machine a flat-bottomed hole with a boring head?
- Oct 24, 2013When you have bored out to the diameter you require,use a boring tool with a flat 90ground on the end,and then incrementally move out the tool to the same depth.Unless you have a DRO on the quill,you would want to use a some form of Z axis travel stop.I don't recommend you use the Z axis travel even with a DRO because you will need towind down the head against a resistance of the gib locks.You could end up with a backlashproblem,and if you are unlucky the head could come crashing down onto the ledge you are machining.Not popular in the US,but the Weiss mill has a DRO measuring the quill movement and a graduated dial that measures the Z axis travel.see link showing the DRO next to the fine feed knob.Also see boring head with facing facility.it's on my Xmas list.I used a Wohlaupter from Germany 25 years ago,when I was Jig Boring, just brilliant.Ideal for internal circlip grooves as well.see other linkThese tools from Arc are manufactured in China,but the price is 60% less thanthe German made models,and ideal for the hobbyist.Again Quality versus your wife's purse.JohnSpain
On Thursday, October 24, 2013 1:56 PM, "clevinski@..." <clevinski@...> wrote:
Several people have recommended that I buy a boring head for my mini-mill. I'm trying to visualize how I would use it, and come up with this question, which I'm sure you experienced machinists have resolved thousands of times.I understand how one would use a boring head in the mill if making a through-hole in a something. But what I don’t understand is how you would make a blind hole, or a hole with a lip at the bottom? If you did this on the lathe, you would, as a last step, “face” the bottom of the hole or lip to make it flat. But that doesn’t seem possible with a boring head.I could imagine doing this with a rotary table, using an end mill to machine the flat bottom surface, but only if the hole were shallow enough that the end mill could reach it.How is this operation typically done?Thanks,CharlieNJ, USA
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