Help......What Angle?
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DocHeb
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surfran
Platinum Member
Chim if I understand by looking at this picture, your 45 would actually need to come from the edge formed by the 90 in the angle iron. So mocking it up with a piece I have, then making some rough measurements, I think you want to cut a 35 degree cut on each of the sides (keeping the other side at a 90 so it is out of the way).
Give that a try and see if it works. It is too hard to explain how I came up with this, and I don't have a cad program on this computer to draw it.
Good luck,
Give that a try and see if it works. It is too hard to explain how I came up with this, and I don't have a cad program on this computer to draw it.
Good luck,
elmerinva
Member
Chim,surfran,
I think surfran is right if what you're trying to do is create a frame of angle iron so that the folded edge of the angle iron is furthest from the inside of the frame. The angle you're trying to find is what would be notched out if you were to bend the angle iron by 90 deg and then have the sides of the angle just meet at the folded corner. If you had a chop saw, you wouldn't have to do it the way you're doing, trying to calculate the angle to cut with a hack saw. Anyway, the angle is the arccotangent of 1.414 (sq root of 2) or 35 deg. Like surfran says, just lay out 35 deg and saw along the mark and it should fit fine. Next time, get a chop saw. Good luck.
I think surfran is right if what you're trying to do is create a frame of angle iron so that the folded edge of the angle iron is furthest from the inside of the frame. The angle you're trying to find is what would be notched out if you were to bend the angle iron by 90 deg and then have the sides of the angle just meet at the folded corner. If you had a chop saw, you wouldn't have to do it the way you're doing, trying to calculate the angle to cut with a hack saw. Anyway, the angle is the arccotangent of 1.414 (sq root of 2) or 35 deg. Like surfran says, just lay out 35 deg and saw along the mark and it should fit fine. Next time, get a chop saw. Good luck.
jmc
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If I understand fuzzy photo #2, your desired 45 degree angle projected onto either leg of the angle iron would be 54.74 degrees, measured from the long axis of the angle iron. Try it with some folded paper angle iron first.
John
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chim
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Everyone - Thanks for the input. I spent most of today at a gun show, so tomorrow is another day for this project. I had been trying to get one prototype of the assembly together in my "spare time" this weekend. I'll try to get it made up and post what I really wanted it to look like. Thanks again for your help...................chim
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<font color="blue"> I spent most of today at a gun show </font>
Sounds like something I would do.... cut a piece 5-10 times, get frustrated, buy a gun and shoot the sawzall! /forums/images/graemlins/tongue.gif
Sounds like something I would do.... cut a piece 5-10 times, get frustrated, buy a gun and shoot the sawzall! /forums/images/graemlins/tongue.gif
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chim
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Re: Help......What Angle? DONE!
I just assembled the prototype today. All my handwringing over the angles disappeared when the dad of a girl on our pistol team invited me to his machine shop. Among other tools, he has a nice heavy duty bandsaw (lube and all) that he volunteered. Heck, he even made the cuts (mebbe didn't trust me with his saw?).
Anyway, the first pic is the whole frame. The short stub on the top will fasten to the existing target-turning mechanism at the range. The frame is 21-1/2" wide X 24" high. It will have cardboard inserted in it, and targets will be stapled to the cardboard. The top horizontal piece of angle is rotated at 90 degrees from the rest, and set back so we can slide cardboard down into the frame from the top. Closeup to follow............chim
I just assembled the prototype today. All my handwringing over the angles disappeared when the dad of a girl on our pistol team invited me to his machine shop. Among other tools, he has a nice heavy duty bandsaw (lube and all) that he volunteered. Heck, he even made the cuts (mebbe didn't trust me with his saw?).
Anyway, the first pic is the whole frame. The short stub on the top will fasten to the existing target-turning mechanism at the range. The frame is 21-1/2" wide X 24" high. It will have cardboard inserted in it, and targets will be stapled to the cardboard. The top horizontal piece of angle is rotated at 90 degrees from the rest, and set back so we can slide cardboard down into the frame from the top. Closeup to follow............chim
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chim
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chim
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Re: Help......What Angle? DONE!
Here's a shot of the top. The angle iron on the top is rotated with the legs pointed to the right. It is fastened off-center (behind center) of the upright angle irons to keep an opening at the top of the frame to slide the cardboard in. All other angle iron has the legs pointed inward to form a "pocket" for the piece of cardboard. Shooters will stand to the left so any bullets hitting the frame will impact metal at a 45 degree angle.
Thanks to all who offered help with the project. Now I gotta make 13 more. They will go a lot quicker. More than half the time spent on this one was making up jigs. Paid off though. The prototype was nice and square, not racked or twisted thanks to a bunch of clamps.....................chim
Here's a shot of the top. The angle iron on the top is rotated with the legs pointed to the right. It is fastened off-center (behind center) of the upright angle irons to keep an opening at the top of the frame to slide the cardboard in. All other angle iron has the legs pointed inward to form a "pocket" for the piece of cardboard. Shooters will stand to the left so any bullets hitting the frame will impact metal at a 45 degree angle.
Thanks to all who offered help with the project. Now I gotta make 13 more. They will go a lot quicker. More than half the time spent on this one was making up jigs. Paid off though. The prototype was nice and square, not racked or twisted thanks to a bunch of clamps.....................chim
