kaizokuace
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| posted on 29/6/06 at 11:28 PM |
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cutting question :(
ok i know this might sound stupid but i am trying to cut LA and LB and i cut in one angle but cant figure out how to cut the second angle so the
pieces can be swept back. should i have cut it in one cut somehow or am i right in doing a compound cut? and how can i cut in the next angle in one
straight cut using a cutoff saw?
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AdamR
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| posted on 29/6/06 at 11:38 PM |
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Dunno about with a cutoff saw, but it is easy enough to do with a hacksaw. I just mark up each face with the correct angle and saw through each face
in turn. So instead of making two cuts, which it sounds like you are doing, I make 1 cut, but doing each face seperately.
In fact, I find working out the angles for each face harder than the sawing. 
[Edited on 29/6/06 by AdamR]
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James
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| posted on 29/6/06 at 11:58 PM |
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quote:
Originally posted by kaizokuace
and how can i cut in the next angle in one straight cut using a cutoff saw?
You don't!
You stop being a lazy fekker and get your hacksaw out! 
HTH,
JAmes
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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kaizokuace
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| posted on 30/6/06 at 12:08 AM |
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: ( but i am a lazy fekker!
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leto
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| posted on 30/6/06 at 05:31 AM |
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That's the spirit!  Power tools are made to be used.
You can do this by “rolling” the tube, I use a 3-cad program to get the angles. I think I have a drawing with the angles for the book tubes somewhere,
will have a look tonight.
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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birdii
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| posted on 30/6/06 at 09:41 AM |
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On the square section tubes I positioned them in the cut off saw at an angle from the base as well as the vice being set for the second part of the
angle. I used my digital spirit level to get the angle of inclination correct. Worked ok for me! Much easier and more accurate than cutting by
hand.
[Edited on 30/6/06 by birdii]
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Fred W B
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| posted on 30/6/06 at 11:25 AM |
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Amazing how often this comes up!
I find that once your abrasive cut off saw is set up dead square, it is too much trouble to keep resetting it when you want to cut miters.
So, what I do:
Quick, dirty, noisy and expensive way:
Mark tube on two adjacent sides,
Clamp tube in vice so you can see the two marked sides with the cut line horizontal and the tube angling away from you,
Push thin slitting disc on small grinder through tube, just above marked line. If you brace your lower hand on the vice you can cut quite
accurately.
Polish back to line and make cut face flat with a poly fan abrasive disc, checking by eye and or angle gauge.
Slow, clean, and cheap way:
Mark tube on four sides,
Clamp tube in vice.
Cut with hacksaw, turning tube over once you have cut the "top" and "front", so you can see the lines on the other faces .
Finish with file, checking with square and angle gauge.
Which method I use depends on the thickness of the material, time of day (noise factor) and if I have stock of discs.
What I find very useful is a carpenters angle gauge. This is a slotted block of plastic which has a pivoting steel blade secured with a wing nut. You
can hold it into the area where you want the part to fit to set the angle, or set it with a protractor, and then use it to mark the tube and check it
once cut. Stanly do a good one cheap.
Cheers
Fred WB
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leto
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| posted on 30/6/06 at 04:08 PM |
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Found it! As you can see on the date this one has been around before.
Make a wedge 25.4º, put it under the tube and cut it at 29.6º.
If you haven't noticed, LA and LB are identical.
The drawing is a full page print so I just give a link to it.
Cilck here for drawing
Cheers!
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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James
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| posted on 30/6/06 at 04:33 PM |
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quote:
Originally posted by birdii
On the square section tubes I positioned them in the cut off saw at an angle from the base as well as the vice being set for the second part of the
angle. I used my digital spirit level to get the angle of inclination correct. Worked ok for me! Much easier and more accurate than cutting by
hand.
[Edited on 30/6/06 by birdii]
Bet with a half decent hacksaw blade I can mark up the tube and cut all four faces quicker than you can set it up with your digital spirit level and
then cut it! 
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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leto
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| posted on 30/6/06 at 06:54 PM |
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quote:
Originally posted by James
Bet with a half decent hacksaw blade I can mark up the tube and cut all four faces quicker than you can set it up with your digital spirit level and
then cut it!
Cheers,
James
Bet with the drawing above and our homemade cutting table I can make two tubes and have a sip of tea before you finished your first tube, even with a
good blade in that hacksaw.
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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James
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| posted on 30/6/06 at 08:18 PM |
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------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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kaizokuace
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| posted on 30/6/06 at 10:49 PM |
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you guys should just grab some metal and a stopwatch and resolve this! btw thanx for the help guys finished up the L piece in no time!
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leto
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| posted on 1/7/06 at 08:09 AM |
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I have a better idea: James, when your car is ready, pack up your blades and come on over and we can have a sawdown (and a beer)
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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