That would be one way to do it. I suppose I could just torch it out too. About a month ago I torched out a 32" circle out of plate using a bolt in the center and a wire attached to the torch. It worked OK, but was thinking there would be easier and cleaner ways to cut this 3" hole.
A lot of...
Btw, a couple people have mentioned having the hole plasma cut, slightly undersized, then finish it up myself. That would be the way to do it, but the customer already has the blank made and wants me to machine some various holes, some threading, a through slot, and a blind slot. I could take...
Thanks to all for your comments. Unless I've missed it, so far I've not seen any comments that someone has cut a 3" hole with an annular cutter on a Bridgeport. But I've read lots of warnings in this thread that it may not work, so I don't believe I'll try it.
Smaller annular cutters do cut...
I'm sorry I misspoke. I was trying to describe the tool holder, and didn't put a lot of thought in how to describe it, so described it incorrectly.
This is actually what I have.
I do have a Hougen R8/annular cutter adapter. That was also another reason I was strongly considering going with a Hougen annular cutter. It fits their cutters nicely and provides good tool holding.
I mentioned it briefly in my first post, probably pretty easy to miss that detail.
Thank you. I had read not to do pecks with annular cutters, but I guess it's different with hole saws. I'm thinking the easy machining of cast helped a lot with the hack. Very ingenious solution either way. Thank you taking the time to post.
The more I think about maybe I should just to buy...
Thank you. That's with a cheapo (relatively speaking) hole saw? How many relief holes did you drill, please? I'll admit I'm a bit hesitant to try the hole saw hack again after a bad experience, but it seems like several folks on the forum have used this successfully.
I've done the hole saw hack route for a big hole once. I only drilled one relief hole, but on the second big hole, all the teeth sheared off the hole saw in the partially cut hole. Not fun to get the sheared off teeth out of the partially cut hole. As I recall, I think that was also in 3/4"...
I dunno. I had assumed so because Hougen 12000 series cutters are designed for their portable mag drills. And the 3" cutters come with a puny 3/4" weldon arbor. But, I've never cut a hole that big, in thick material, so I honestly don't know.
I have a job coming up which, among other things, involves cutting a 3.250" hole in a 3/4" plate of 1018. I plan to cut the hole on a Bridgeport using an annular cutter. I have an R8 to 3/4" weldon adapter for it. But I'm not sure which cutter to buy, since I don't have anything near a 3"...
Thank you. I hadn't considered chlorine attacking ABS, or attacking a SS weld. I had planned to use 309L for the filler material, which I have on hand. I'm not able to find anything on the web whether or not it's susceptible to degradation from chlorine. Do you happen to know?
One of my...
"You sure you want a metal male fitting being threaded into a plastic female fitting??? I have seen too many failures of the female side in this situation, both hot and cold environments…"
That's a valid issue. I am aware plastics and chlorinated plastics have a radically different expansion...
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