[TowerTalk] [Bulk] Re: [Bulk] Re: Grinding hole in thick steel plate?
Roger (K8RI) on TT
K8RI-on-TowerTalk at tm.net
Thu Sep 10 13:00:43 EDT 2015
They cut the deadbolt holes in our steel doors too small. I was able to
cut a plug that just fit. The center hole worked for the larger hole as
well although I'd use aluminum for the plug in solid steel. Cut one a
bit over size and trim on a lathe if possible. I think the hole saw in
3/4" steel will be slow going. Lots of lube!
73
Roger (K8RI)
On 9/9/2015 12:19 PM, Grant Saviers wrote:
> Charlie,
>
> The proposed "move the hole 0.25"" application of a hole saw would
> have it cutting only on one circular segment of the work, so the
> center stub on the hole saw is undergoing a +/- something stress
> reversal of bending every rotation. In my segment sawing try the hub
> fatigued and broke, which was a very logical result in retrospect. I
> was using a high quality US brand bi-metal saw about 3" in diameter.
> For a smaller diameter saw the peak to peak stress cycle would be less
> so the saw hub might not fail from fatigue. For a full circle cut,
> there should be no bending of the hub when using a drill press.
>
> Another way to manage the chip buildup in a 360 degree hole saw slot
> is to drill 2 to 4 thru holes just inside the od of the saw kerf so
> the chips can be pushed out to the backside of the work, so it needs
> to be clear. For sawing a segment that is not needed as the swarf
> will mostly clear itself.
>
> Grant KZ1W
<snip>
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