LoCorun
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| posted on 31/12/05 at 02:13 AM |
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How do I cut accurate angles?
Well, I've got the tube and atleast some of it is cut to length. How on earth to I get cut the angles? I was originally thinking using a
protractor and marking a line... But all protractors are too big.
I don't have a mitre box and I'd rather not get one unless I have to. The book doesn't say you need one (though it doesn't say
how to cut the angles either...).
What have you guys done and what should I do? :-)
Also, how accurate do the angles really need to be?
Thanks.
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Alan B
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| posted on 31/12/05 at 03:11 AM |
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You need a proper engineering protractor....here is an example...click here.....then enter 2061 in the search box
and then scroll down to the protractor.
As for accuracy, set it as close as you can with the naked eye and should be close enough. In reality you can possibly be a couple of degrees out
before you have a gap too big at the joint, but aim for the best you can.
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bigdaddyadd
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| posted on 31/12/05 at 07:55 AM |
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I would mark each part by hand if you are only planning to build the one chassis and cut with a very thin disc on a 4.5" grinder. The reason for
this is that several of the tubes have double splays and if you are fairly new to welding having a touch on edge but a big gap for the other 3 will
leave you struggling to fill gaps. The easiet way is with a square and a steel rule. calculate angles from given dimensional lengths and lengths from
given angles with trig. All the calcs you need can be found in the back of zues pocket book. (get one from tool suppliers)or if you are struggling I
could send you a copy with a few pointers.
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caber
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| posted on 31/12/05 at 09:10 AM |
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Print out Mc Sorely plans preferably on A3 paper and lay the tubes over the plan to scribe the angles. Don't trust a chop off saw to give
accurate angles :-( guess how I found out! Cut tubes with angle grinder and finish to the scribe line with a flat file if you want dead accurate
alignment otherwise you will end up filling gaps with weld!
Caber
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Hugh Paterson
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| posted on 31/12/05 at 09:47 AM |
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Protractor and adjustable bevel gauge, two 4 1/2" grinders one with a thin disc cut off blade one with a ali/zirconium buffing disc to take to
the scribe line. Flat files are for blacksmiths
Shug.
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907
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| posted on 31/12/05 at 10:05 AM |
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Machine Mart do a very nice combination set.
Cast Iron, not cheapo ally.
Not up to Moore & Wright or Mitotoyo (speeling), but then it's not £200.
A sliding square makes a great backmark.
Paul G
(The top pic is their protractor, I havn't got one of these.)
How do you do a Link?
[Edited on 31/12/05 by 907]
 
Rescued attachment protractor-combination-set.jpg
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rash
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| posted on 31/12/05 at 10:29 AM |
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"Flat files are for blacksmiths"
flat files are for engineers grinders are for lazy gits
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907
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| posted on 31/12/05 at 11:31 AM |
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quote:
Originally posted by rash
"Flat files are for blacksmiths"
flat files are for engineers grinders are for lazy gits
And band saws are for engineers who are lazy gits.
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andyps
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| posted on 31/12/05 at 12:17 PM |
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I'm using a "variable" set square which I made at school (many years ago) - I knew it would come in useful one day! The McSorley
plans on A4 are accurate enough for me to line up the square, set its angle and then scribe it on the tube. Then I have to try and guide the hacksaw
accurately. All my gaps should be weldable
Andy
An expert is someone who knows more and more about less and less
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Gav
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| posted on 31/12/05 at 12:28 PM |
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I did mine with a combination set and its resonably accurate.
The worst bit was marking/cutting the compound angles on the "L" section and the two diagonals for the section behind the seats.
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mangogrooveworkshop
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| posted on 31/12/05 at 12:34 PM |
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quote:
Originally posted by 907
quote:
Originally posted by rash
"Flat files are for blacksmiths"
flat files are for engineers grinders are for lazy gits
And band saws are for engineers who are lazy gits.
And what about a fluid cooled bandsaw.........
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Wadders
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| posted on 31/12/05 at 12:39 PM |
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Theyr'e for rich engineers who are lazy
Originally posted by mangogrooveworkshop
quote:
Originally posted by 907
quote:
Originally posted by rash
"Flat files are for blacksmiths"
flat files are for engineers grinders are for lazy gits
And band saws are for engineers who are lazy gits.
And what about a fluid cooled bandsaw.........
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JoelP
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| posted on 31/12/05 at 12:44 PM |
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im disillusioned with band saws, mine just wont cut perfect even after some fiddling. Plus it derails itself now and again, which wastes more time
than using a grinder would. Id love to get a bigger band saw, but cant bear the risk that it would still be crap.
plus it cant do compound angles or extreme angles.
[Edited on 31/12/05 by JoelP]
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907
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| posted on 31/12/05 at 01:02 PM |
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quote:
Originally posted by JoelP
plus it cant do compound angles
Waddayamean?
Say 30 sloping @ 10 deg....
Set vice at 30. tip up 10.
job done.
(mine was £175 by the way. Less than a dishwasher)
Paul G
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JoelP
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| posted on 31/12/05 at 04:28 PM |
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ok, so you can wedge it to compound angles! mine was about 200 from machine mart, i think a large work support would make it better.
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Hugh Paterson
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| posted on 31/12/05 at 05:48 PM |
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Compound angles eh, that would be my nice German tungsten tipped dry chop saw that cost squat when the blacksmith next door went bust, now if I could
only find the bluddy blade fer it. He got it from an auction and it lay the corner of his workshop for so long it ended up covered in offcuts. 
Shug
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emsfactory
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| posted on 31/12/05 at 05:55 PM |
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ive got the 200 odd quid clarke job too. Very happy with its accuracy. Much better than pissing about with a grinder. The belt can pop off if you
dont have it tight enough or if the piece your cutting is not supported properly. They can pinch towardes the end of a cut.
Having a crap blade doesn't help either.
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emsfactory
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| posted on 31/12/05 at 06:00 PM |
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Got this for my lathe. Works well for the bandsaw too.
http://www.axminster.co.uk/name/coolant/sfile/1/jump/0/product-Axminster-Coolant-System-21084.htm
If you cant spring to that a wee squirt with lusol or WD40 on the blade as you start to cut makes it run nice and smooth.
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LoCorun
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| posted on 31/12/05 at 06:42 PM |
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Went down to B & Q Today. I got this cool protratory thing, basically it's like a set square but it allows you to set the angle. It looks
perfect for the job. I hope to have a rolling chassis by March. *crosses fingers*.
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David Jenkins
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| posted on 31/12/05 at 08:37 PM |
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I've got a good hacksaw...
2 factors in its favour:-
1. Cheaper than a grinder or a band saw
2. Really quiet when working late at night in the garage.
Bonus factor - gave me a work-out every time I did some cutting!
It did help having a good hacksaw frame, and good blades.
I'm sure that I wasn't much slower doing it by hand, when compared to the time needed to set up a machine.
David
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Hugh Paterson
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| posted on 31/12/05 at 08:43 PM |
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David.
IMHO hacksaws are usefull for developing barmaids Biceps and nowt else
Shug.
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Simon
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| posted on 1/1/06 at 12:40 AM |
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I cut out all my chassis tubes with a hacksaw (in two days) - by the time you get to the last few tubes, you'll be cutting perfect angles
without measuring them
ATB
Simon
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