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Hole saw for a big hole.
Posted: Sun Jun 04, 2017 9:45 am
by earlgo
Rather than trying to drill and bore out a 2 1/4in hole through 1/2" plate, I thought I'd try to use a 2 1/8in hole saw. It worked well, but I had to cut some chip clearance on the inside of the curve. This and a few boring bar passes and it was done. Saved quite a bit of time. Oh and I got to use the Sebastian and May lathe from the '80's.... 1880's that is. (The 4 jaw is newer, obviously.) Couldn't grip this plate in the ATLAS 6" chuck.
- 2 1/8 dia hole saw
--earlgo
OSHA would love this lathe...NO GUARDS ANYWHERE
Re: Hole saw for a big hole.
Posted: Sun Jun 04, 2017 11:32 am
by John Evans
Yep! Chip clearance holes are the answer when using a hole saw on anything thicker than a 1/8-3/16. Otherwise you spend lots on time retracting to clear chips.
Re: Hole saw for a big hole.
Posted: Sun Jun 04, 2017 11:34 am
by SteveHGraham
No annular cutter?
Re: Hole saw for a big hole.
Posted: Sun Jun 04, 2017 11:36 am
by John Evans
SteveHGraham wrote:No annular cutter?
You ever price one in that size??
Re: Hole saw for a big hole.
Posted: Sun Jun 04, 2017 11:41 am
by SteveHGraham
I thought everyone here but me was rich.
Re: Hole saw for a big hole.
Posted: Sun Jun 04, 2017 7:27 pm
by mcostello
Treplaining would also have worked.
Re: Hole saw for a big hole.
Posted: Mon Jun 05, 2017 1:27 pm
by Steggy
earlgo wrote:OSHA would love this lathe...NO GUARDS ANYWHERE
The machine was designed back when machinists knew where not to stick their fingers and other appendages.
Nowadays, the nanny state insists that we be protected from every possible thing that could ever go wrong, even things that have never happened. I'm surprised the OSHA people haven't mandated that cutting tools not have sharp edges.
Re: Hole saw for a big hole.
Posted: Wed Jun 14, 2017 3:48 pm
by whateg0
BigDumbDinosaur wrote:earlgo wrote:OSHA would love this lathe...NO GUARDS ANYWHERE
The machine was designed back when machinists knew where not to stick their fingers and other appendages. ...
To be fair, I've seen plenty of photos of machinists "back in the day" who apparently did not know where not to stick their appendages.
Dave
Re: Hole saw for a big hole.
Posted: Thu Jun 15, 2017 7:47 am
by liveaboard
I had need to bore a 90mm hole at a 45 degree angle through a large thick PVC tube [a round tank actually].
I couldn't find a 90mm holesaw; I did find one online but the postage they were asking was simply silly.
Besides, it wasn't deep enough to make the angle.
So, I made my own.
Re: Hole saw for a big hole.
Posted: Thu Jun 15, 2017 9:44 am
by earlgo
Nicely done. I like your holding fixture.
--earlgo
Re: Hole saw for a big hole.
Posted: Thu Jun 15, 2017 11:37 am
by whateg0
earlgo wrote:Nicely done. I like your holding fixture.
--earlgo
That was definitely creative! I've had some questionable setups on my mill table from time to time. But when you have a part to hold and it doesn't fit in the vise, what's a guy to do? There should be a thread somewhere of questionable setups. That's likely to be scary!
Re: Hole saw for a big hole.
Posted: Thu Jun 15, 2017 12:50 pm
by liveaboard
Well, it's only PVC... 10mm [3/8"] thick. it bounced around a little as the teeth hit but settled down as the groove progressed.
The tube I used for the saw is really thick, also about 10mm, but it was all I had to hand with the OD I needed. I brazed on used carbide inserts as cutting teeth.
I used a 25mm center shaft as I had one with an M2 taper on it already. Obviously, I drilled the guide hole first.