Cafe Racer Forum banner
1 - 20 of 45 Posts

·
Registered
Joined
·
26 Posts
Discussion Starter · #1 ·
I have been cutting out these motorcycle shapes with my home-made CNC plasma table, I thought I would share them here. They are approximately 19" long and cut from 1/8" thick (11 gauge) mild steel. I have identified the bikes in the pictures, although hopefully they are sufficiently detailed for that to be unnecessary. Please note that this was done totally for my own enjoyment, and I have no intention of selling them.

Tire Wheel Land vehicle Motorcycle Motor vehicle


Wheel Tire Fuel tank Automotive fuel system Vehicle


Tire Fuel tank Wheel Automotive tire Motorcycle


Tire Wheel Land vehicle Property Shelf


Wheel Picture frame Tire White Vehicle


Wood Gas Cooking Machine Machine tool
 

·
Registered
Joined
·
77 Posts
Man that's awesome, I actually just got my crossfire pro CNC machine and am in the midst of building it. You just inspired me to make a cut out of my CB200. I like your table by the way
 

·
Registered
Joined
·
26 Posts
Discussion Starter · #7 ·
How do you do it? Trace a stencil in Photoshop and use CAD to convert it to G-code?
I import a photo of a bike into CorelDraw, and then trace the significant lines and shapes. After deleting the photo I export the drawing as a dxf file. My CNC software converts the dxf file into G-code and cuts the shape.

This is Clem Johnsons "Barn Job" 96 c.i. Vincent fuel drag bike.

Tire Wheel Fuel tank Motorcycle Automotive tire


Automotive design Automotive exterior Font Motor vehicle Automotive lighting


Wheel Tire Fuel tank Vehicle Automotive tire
 

·
Registered
Joined
·
77 Posts
Do you trace it on computer with a mouse or on a tablet with a pen? I just got my table assembled and I'd love to do a 67' Yamaha 305 big bear scrambler for my dad for his birthday
Tire Fuel tank Automotive fuel system Wheel Vehicle

Musical instrument Electronic instrument Musical instrument accessory Keyboard Table
 

·
Registered
Joined
·
26 Posts
Discussion Starter · #11 ·
Do you trace it on computer with a mouse or on a tablet with a pen?

I do it on a computer with the mouse. If your CNC system will import a dxf file, I recommend that you pick up a copy of CorelDraw. Versions a couple of years old can be found on eBay at reasonable prices. In doing my bikes, manually tracing the lines precisely would be almost an impossibility. With CorelDraw, you can do almost anything once you learn to use the node editing tools. You can easily follow a curved line with any contour exactly by manipulating two or three nodes. I can't begin to list all its functionality.

If you are just doing simpler stuff, like cutting brackets, you probably don't need the same capability. Learn how to use CorelDraw, and the sky's the limit. Your CNC software must be able to handle the standard tasks, such as automatically cutting inside shapes first, compensating for the kerf, cutting holes and other internal shapes counter-clockwise and external shapes clockwise, etc.

Here's another one I did today. This involved planning and drawing it, cutting it out, cleaning off the dross, prepping for paint, and painting. This is an early Harley XR-750 flat tracker.

Tire Fuel tank Motorcycle Wheel Vehicle
 

·
Registered
Joined
·
77 Posts
Ahh perfect. You have just resolved many questions I had in one response. I can import dxf files, and I made sure to remember to do all the innermost contours first before cutting the outside last as well as setting the kerf specs. I'll look around for a copy of coreldraw. Much appreciated but one last thing, what's the importance of cutting counter-clockwise to clockwise?
 

·
Registered
Joined
·
26 Posts
Discussion Starter · #13 ·
what's the importance of cutting counter-clockwise to clockwise?

Rule of thumb - If you were a little man sitting on the end of the torch facing in the direction the torch is headed, the side on your right is always going to be better (less taper) than the side on your left.

Also, remember to always use lead-ins and possibly lead-outs for interior and exterior shapes (not for lines). Curved lead-ins and outs are best. This minimizes , but doesn't eliminate piercing flaws.
 

·
Registered
Joined
·
77 Posts
The CAD software I'm using automatically sets the lead ins, and you set the contours by clicking them in order first to last which makes it pretty simple to use. I'm at a crossroads on what coreldraw to buy. There are complete yearly editions that are quite expensive and then there are coreldraw "essentials" that are a fraction of the price. I'm only looking for something to trace outlines and do some photo editing on, you think the essentials will cover that?
 

·
Registered
Joined
·
26 Posts
Discussion Starter · #15 ·
The CAD software I'm using automatically sets the lead ins, and you set the contours by clicking them in order first to last which makes it pretty simple to use. I'm at a crossroads on what coreldraw to buy. There are complete yearly editions that are quite expensive and then there are coreldraw "essentials" that are a fraction of the price. I'm only looking for something to trace outlines and do some photo editing on, you think the essentials will cover that?
I'm no expert on CorelDraw versions or compatibility with different computer operating systems. Nevertheless, I think your best best is to get a full version of CorelDraw that is several years old. The brand new stuff doesn't really add that much except they are trying to get you on the hook for a yearly subscription. Get an older stand alone version and it should have everything you need. If you are running Windows 8, you will find a lot of compatible CorelDraw packages out there. The newer your operating system, the less likely an older version of Corel will run on it. I don't use it anymore, but I even have a 1995 version 6 copy of Corel running in Windows 8. I wouldn't recommend going back nearly that far though.

Whatever you decide on, just make sure it will run on your computer, and that it is the full version with CorelDraw, PhotoPaint, etc. Also make sure it is a self-contained version rather than a subscription. I would suggest you get it on cd(s) rather than a download. You always take a chance with the cheap stuff, but check the seller's eBay feedback profile. Someone with great feedback won't want to tarnish it by screwing over a customer.
 

·
Registered
Joined
·
26 Posts
Discussion Starter · #16 ·
Another detail about CorelDraw:

It may seem like a big task to trace around the lines in a photograph accurately. With CorelDraw, you can quickly draw an irregular line along the desired path. You can then delete most of the nodes created on the path, and use the "handles" on the remaining nodes to smooth the line along the desired contour. See below:

Rectangle Slope Plot Parallel Font
 

·
Registered
Joined
·
77 Posts
Nice, I figured you'd have the professional plasma cutter. I used to use the hypertherm 65 back when I was welding 5th wheel chassis. My razorweld 45 uses the same consumables as yours, best price I can find so far on those is 5 tips and 5 electrodes for around $20 on Amazon.

Nice to see you weld with blue too, looks like a multimatic 200
 
1 - 20 of 45 Posts
Top