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Unread 04-27-2011, 12:04 AM   #1
krazymatt
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Question About Plasma Cam and Bumper Fab

I plan on fabbing a front bumper out of 3/16" Plate steel. I like the XRC Style of bumpers but I want to create my own version. My friend has a plasma cam cutting system and he said he'll do the cutting for a small fee. Now I know most of the time in these situations you start off with cardboard patterns then you transfer them on to steel. When using a plasma cam system, how do you get the cardboard patterns onto the computer for the plasma cam?

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Unread 04-27-2011, 01:41 AM   #2
KMD
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Scanner I believe.
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Unread 04-27-2011, 05:28 AM   #3
BESRK
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Either measure them out and enter the dimensions..

or take a digital pic from above, import the JPEG into the CAD, trace it out and scale it to size. That's usually pretty quick..
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Unread 04-27-2011, 06:41 AM   #4
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Thanks. That should be pretty simple then. Is there any advice I should follow as far as building this style of bumper nice and strong? I know the easiest way to make a tough bumper is to use a piece of 2x5" rectangular tubing, but that's to plain for my tastes. I know it will be a bit tougher to make a strong bumper out of plate steel. Any advice is welcome. THanks...
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Unread 04-27-2011, 07:56 PM   #5
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Steel plate bumpers can be stronger that tubing bumpers Depends on the design and how well the welds are. remember The more triangulation you have the stronger it will be.
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Unread 04-27-2011, 08:35 PM   #6
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Just make sure to run a flap disk along the plasma cut edges to remove all traces of the plasma dross. Otherwise, you'll run into porousity pinholes when you start grinding the welds down... ask me how I know..
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Unread 04-28-2011, 12:08 AM   #7
krazymatt
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Quote:
Originally Posted by BESRK
Just make sure to run a flap disk along the plasma cut edges to remove all traces of the plasma dross. Otherwise, you'll run into porousity pinholes when you start grinding the welds down... ask me how I know..
I haven't decided for sure if i'll use the pc to cut the metal. My friend was telling me about some f the isues. I might be better off using the grinder or cutoff wheel. I'll see.
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Unread 04-28-2011, 05:39 AM   #8
BESRK
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I've got a plasma table.. if given the choice, I'd use it to cut everything.. everytime. It is that much better.
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Unread 04-28-2011, 08:36 AM   #9
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Quote:
Originally Posted by krazymatt View Post
I haven't decided for sure if i'll use the pc to cut the metal. My friend was telling me about some f the isues. I might be better off using the grinder or cutoff wheel. I'll see.
As BESRK said, absolutely no way! You will not get a better, straighter, more accurate cut then the CNC.
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Unread 04-28-2011, 02:44 PM   #10
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I have a plasma cam table and the easiest way for you would be to grab deminsions from each piece and design it manually in the system. Pictures, tracing, and correct size gets really tough with the pcam software.
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Unread 05-01-2011, 09:47 AM   #11
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I started laying out some cardboard to get an idea for my front bumper, and man it's tough to get the cardboard to stay the way you want it. It's getting discouraging real fast especially when this is all new to me. I've used cardboard patterns to reinforce a frame but building a cardboard bumper is another story.
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Unread 05-01-2011, 02:48 PM   #12
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You need the thin single layer cardboard not the coragated stuff.
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