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- Path: sparky!uunet!news.claremont.edu!nntp-server.caltech.edu!ccsf.caltech.edu!jack
- From: jack@ccsf.caltech.edu (Jack Stewart)
- Newsgroups: rec.woodworking
- Subject: Re: Anyone cut metal with a circular saw? (WARNING)
- Date: 26 Jan 1993 01:30:19 GMT
- Organization: CCSF Caltech, Pasadena, CA
- Lines: 80
- Distribution: world
- Message-ID: <1k247bINNkds@gap.caltech.edu>
- References: <14340021@hp-ptp.ptp.hp.com> <16B5E12A88.EPLUS17@vmd.cso.uiuc.edu>
- NNTP-Posting-Host: laguna.ccsf.caltech.edu
-
- In article <14340021@hp-ptp.ptp.hp.com>
- keith@hp-ptp.ptp.hp.com (Keith Millar) writes:
-
- >I have this great idea that I can put a particle metal cutting blade in my
- >circular saw and cut metal pipe and box steel and sheet steel ( <= 1/4 inch )
- >
- >Is there any reason why I shouldn't? Are regular circular saws (mine is a
- >black and decker trade 1/4 hp) able to handle the job? I was thinking that
- >perhaps the hot sparks or wrong speed might be a factor.
- >
-
- I am distrubed with the direction that this thread is taking so I
- thought that I ought to put in my $0.02 worth.
-
- It is NEVER a good idea to use a tool for a purpose that it wasn't
- intended or designed for. Most (i.e. average quality) circular saws
- are designed only for wood (some are really only adequate for soft
- wood). The RPM, torque, and HP power on the average circular saw are
- wrong for metal. Using the wrong tool for the job is what causes a
- lot of accidents.
-
- I have never used a circular saw for cutting metal. The thought never
- crossed my mind. I have done a lot of metal work (Mill, lathe,
- grinders, etc.). Most Mills and Lathes using carbide steel to cut
- with and have very low RPM's depending on the material (400-1500RPM).
- Most of the Grinders that I have worked with run at 10000-12000 RPM
- and do an adequate job of cutting metal (especially with the correct
- blade). I have also worked with Tile Saws and I would expect the
- design of a good metal cutting saw to be similar (i.e. water cooled).
- By comparison, a circular saw is poorly designed for cutting metal.
- The blade guard only gets in the way of cutting. The circular saw
- doesn't cool the blade (or the saw itself) fast enough. And the
- bottom plate isn't right for keeping the blade at the correct depth
- (Metal particle blades wear out fast).
-
- Having said all of this, I should also add that the metal particle
- blade is probably one of the safest on the planet. I have never seen
- one shatter and there is not a lot of damage that a metal particle
- blade could do if it does shatter. The blade on a Tile saw, which is
- very similar to a metal particle blade (expect that it is a diamond
- particle and a little wider), is so safe that you can put you finger
- up to it while it is spinning a full speed. If you still want to cut
- with a circular saw - check with your saw's manufacturer. They (or
- their lawyers) should be able to tell you if their tool is up to the
- job. Some of the better quality circular saws *might* do an adequate
- job.
-
- Also look at what sort of metal you are cutting and how much you are
- cutting. If you do a lot it might be worth investing in (or renting)
- specialized equipment. Otherwise there are a number of hand tools
- that do a reasonable job (i.e. Hacksaw, Tin Snips, Pipe Cutter). BTW,
- with a Hacksaw, you job will go a lot faster if you have the right
- sort of blade in it (and it is sharp).
-
- In article <16B5E12A88.EPLUS17@vmd.cso.uiuc.edu>, EPLUS17@vmd.cso.uiuc.edu (Richard Engelbrecht-Wiggans) writes:
- > Since then, I have invested in a more expensive
- > (Milwaukee) saw and it cuts through that angle
- > stock as if it were butter. I am however concerned
- > about the possibility that all the particles
- > created by my metal cutting might have an adverse
- > affect on the saw's bearings etc; does anyone know?
-
- A good quality saw (such as a Milwaukee) should have sealed bearings
- so the damage shouldn't be too bad. However does the air intake on
- the saw have filters? If is doesn't then you could be spraying metal
- particles all over the motor. Metal particles can also do a number on
- your lungs. Most masks will do a reasonable job of protecting your
- lungs. Ear Protection is also really good idea when cutting metal
- (Grinders are LOUD).
-
- This is just my $0.02 worth. I thought I should inject a note of
- caution.
-
- ---Jack
-
- --
- Jack Stewart E-Mail: jack@CCSF.Caltech.EDU
- Caltech Concurrent Supercomputing Facilities, Phone: 818-356-2153
- Mail Code # 158-79, 391 S. Holliston,
- Pasadena, CA 91125. #include <std.disclaimer>
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